Chapter 67

67.11(1)(d) (d) The premium, if any, for which the municipal obligations have been sold above par value and accrued interest.

67.11(1)(e) (e) Such further sums raised by taxation or otherwise, as may be necessary to make all interest and principal payments due in any year. The levying and collection of the taxes or other revenues are authorized; but the governing body may, in its discretion, levy and collect larger sums than the sums so authorized, in order to speed the payment of municipal obligations.

67.11(2) (2) Debt service for municipal obligations issued under this chapter shall be paid from the appropriate debt service fund account created in sub. (1). All investments shall mature in time to make required debt service payments. If invested, the funds to provide for debt service payments due prior to the scheduled receipt of taxes from the next succeeding tax levy shall be invested in direct obligations of the federal government or, if authorized under s. 25.50, in the local government pooled-investment fund under that section. Thereafter, any balance in an account created in sub. (1) may be loaned or invested under the direction of the municipality’s governing body as follows:

67.11(2)(a) (a) In any outstanding municipal obligations for the payment of which the debt service fund is required, at any price not exceeding the principal, accrued interest and a premium not to exceed 3 years’ interest on the municipal obligations. These municipal obligations, when purchased, shall immediately have written on the face thereof a statement, signed by an officer of the municipality, that they have been taken up and cannot again be negotiated or made obligatory; and all of these municipal obligations shall be deemed paid and shall be immediately canceled.

67.11(2)(b) (b) In obligations of the United States.

67.11(2)(c) (c) In any bonds or securities issued under the authority of such municipality, whether the same create a general municipal liability or a liability of the property owners of such municipality for special improvements made therein.

67.11(2)(d) (d) In the local government pooled-investment fund, as defined in, and subject to the procedures in, s. 25.50.

67.11(3) (3) Investments and earnings under sub. (2) continue a part of the debt service fund account for each issue. The obligations representing these investments may be sold or hypothecated by the governing body at any time, but the money received shall remain, until used, a part of the debt service fund account for each issue. All payments by the municipality of principal or interest of obligations representing investments under sub. (2) shall be paid into debt service fund accounts, and, for the purpose of making these payments, the municipality shall levy every tax that it would be legally obligated to levy if the municipal obligations were still outstanding in the hands of purchasers and had not been purchased as an investment.

67.11(4) (4) Money shall not be withdrawn from a debt service fund account and appropriated to any purpose other than the purpose for which the account was instituted until that purpose has been accomplished.

67.11(5) (5) Any balance in any debt service fund account after all of the municipal obligations for the payment of which the account was instituted have been paid and canceled, and after all investments under sub. (2) (b) and (c) have been finally disposed of or realized upon, shall be carried into the general fund of the municipal treasury unless transferred as directed by the municipality’s governing body.

67.11 History History: 1971 c. 154; 1975 c. 200; 1981 c. 282 ss. 28, 45; 1983 a. 207; 1987 a. 197; 1991 a. 33.

67.11 Annotation Under the facts of the case, when a city created a sinking fund to retire school bonds, and a city school district was reorganized into a financially independent joint school district, surplus moneys in the fund were non-apportionable assets of the district. Joint School Dist. No. 1 of Chilton v. City of Chilton, 78 Wis. 2d 52, 253 N.W.2d 879 (1977).

67.12 67.12 Temporary borrowing and borrowing on promissory notes.

67.12(1) (1) Borrowing in anticipation of revenues.

67.12(1)(a) (a) Except for school districts and technical college districts, any municipality that becomes entitled to receive federal or state aids, taxes levied or other deferred payments may, in the same fiscal year it is entitled to receive the payments, issue municipal obligations in anticipation of receiving the payments. The municipal obligations issued under this paragraph shall not exceed 60 percent of the municipality’s total actual and anticipated receipts in that fiscal year and shall be repaid no later than 18 months after the first day of that fiscal year.

67.12(1)(b) (b)

67.12(1)(b)1. 1. Any municipality may issue municipal obligations in anticipation of receiving proceeds from clean water fund loans or grants for which the municipality has received a notice of financial assistance commitment under s. 281.58 (15), from bonds or notes the municipality has authorized or has covenanted to issue under this chapter or from grants that are committed to the municipality. Any municipal obligation issued under this subdivision may be refunded one or more times. Such obligation and any refundings thereof shall be repaid within 5 years after the original date of the original obligation.

67.12(1)(b)2. 2. Any municipality may issue municipal obligations in anticipation of receiving proceeds from brownfields revolving loan program loans or grants under the program described in s. 292.72 if the municipality has received written notification from the department of natural resources that the department intends to distribute such proceeds to the municipality. The obligation shall be repaid within 10 years after the original date of the obligation, except that the obligation may be refunded one or more times. Any refundings shall be repaid within 20 years after the original date of the original obligation.

67.12(1)(c) (c) Any municipality that issues a municipal obligation under this subsection shall adopt a resolution indicating the amount and purpose of the obligation and the anticipated revenue to secure the obligation and may pledge or assign all or portions of the revenue due and not yet paid as security for repayment of the obligations. Municipal obligations issued under this subsection shall be executed as provided in s. 67.08 (1), may be registered under s. 67.09, and do not constitute an indebtedness for the purpose of determining the municipality’s constitutional debt limitation.

67.12(8) (8) Temporary borrowing by school board.

67.12(8)(a) (a) The school board of any common, union high school or unified school district may:

67.12(8)(a)1. 1. After the tax for operation and maintenance of the schools for the current school year has been voted, borrow money as needed to meet the immediate expenses of operating and maintaining the public instruction in the school district during the current school year. No such loan may extend beyond November 1 of the following school year.

67.12(8)(a)2. 2. In June prior to voting an annual tax for the operation and maintenance of the schools for the subsequent school year, and in July and August prior to voting an annual tax for the operation and maintenance of the schools for the current school year, borrow money as needed to meet the immediate expenses of operating and maintaining the public instruction in the school district from July 1 to the last working day in October. The school board may borrow money under this subdivision only upon a recorded resolution adopted by a two-thirds vote of its members. The resolution shall levy an irrepealable tax sufficient in amount to pay the principal of the loan and the interest thereon as they become due and payable. If the borrowing occurs in June, the loan shall be repaid on or before November 1 of the 2nd school year commencing after the date of the loan. If the borrowing occurs in July or August, the loan shall be repaid on or before November 1 of the school year commencing after the date of the loan.

67.12(8)(b) (b)

67.12(8)(b)1. 1. The total amount borrowed under par. (a) may not exceed one-half the estimated receipts for the operation and maintenance of the school district for the school year in which the borrowing occurs, as certified by the school district clerk.

67.12(8)(b)2. 2. To evidence a loan under par. (a), the school board shall deliver to the lender its tax and revenue anticipation promissory note or notes or its school order. Each note and each order shall be executed as provided in s. 67.08 (1) and may be registered under s. 67.09. Each note or order, when paid, shall be receipted and returned to the school district treasurer.

67.12(8a) (8a) Temporary school district loan against revenues; regarded as paid debt. Whenever a school district shall have become entitled to state aids, tuition revenues, or taxes levied, the district may pledge or assign all or portions of these revenues due but not yet paid as security for the repayment of loans required for operating purposes. Short term indebtedness secured by such assignment shall be construed as a paid or satisfied debt in reporting or computing the outstanding debt of the school district.

67.12(8m) (8m) Temporary borrowing by technical college district. The technical college district board may borrow money as needed to meet the immediate expenses of operating and maintaining the schools of the district during the current fiscal year. No such loan may extend beyond November 1 of the following fiscal year. The total amount borrowed may not exceed one-half the estimated receipts for the operation and maintenance of the schools for the current fiscal year in which the borrowing occurs, as certified by the district treasurer. All such loans shall be evidenced by promissory notes which shall be executed as provided in s. 67.08 (1) and may be registered under s. 67.09. Whenever a technical college district becomes entitled to state aids, tuition revenues or taxes levied, the district may pledge or assign all or portions of these revenues due but not yet paid as security for the repayment of promissory notes issued under this subsection. Any indebtedness secured by such assignment shall be construed as a paid or satisfied debt in reporting or computing the outstanding debt of the district.

67.12(12) (12) Borrowing on promissory notes.

67.12(12)(a) (a) Any municipality may issue promissory notes as evidence of indebtedness for any public purpose, as defined in s. 67.04 (1) (b), including but not limited to paying any general and current municipal expense, and refunding any municipal obligations, including interest on them. Each note, plus interest if any, shall be repaid within 20 years after the original date of the note.

67.12(12)(b) (b) A school board of any newly created school district or a technical college district board may, pursuant to this section, issue promissory notes to refund any indebtedness assumed by the district upon its creation.

67.12(12)(c) (c) At any time during the term of any promissory note, or thereafter, if the municipality has not paid the full amount due on a note:

67.12(12)(c)1. 1. The lender may grant an extension of time; or

67.12(12)(c)2. 2. The municipality may issue a promissory note to refund a promissory note or any part thereof or to refund a refunding promissory note. Any refunding note issued under this subdivision shall be paid within 10 years after the original date of the refunding note and within 20 years after the date of the original promissory note.

67.12(12)(cc) (cc) Any such note or notes may provide for prepayment on the terms and conditions prescribed therein.

67.12(12)(d) (d) Such notes shall be executed as provided in s. 67.08 (1), may be registered under s. 67.09 and shall include a statement specifying the provisions of the resolution authorizing the issuance or a reference to the resolution so that it can be readily located. The notes issued under this section are an indebtedness of the municipality issuing them.

67.12(12)(e) (e) Before any promissory note is issued under this subsection:

67.12(12)(e)1. 1. The governing body of the municipality shall adopt and record a resolution specifying the purposes and the maximum amount of the note issued.

67.12(12)(e)2. 2. Unless the purpose and amount of the borrowing have been approved by the electors under s. 67.05 (6a) or deemed approved by the electors under s. 67.05 (7) (d) 3., the purpose is to refund any outstanding municipal obligation, the purpose is to pay unfunded prior service liability contributions under the Wisconsin retirement system if all of the proceeds of the note will be used for that purpose, the borrowing would not be subject to a referendum as a bond issue under s. 67.05 (7) (cc), (er), (h), or (i), or subd. 2g. or par. (f) or (h) applies, the school district clerk shall, within 10 days after a school board adopts a resolution under subd. 1. to issue a promissory note in excess of $5,000, publish notice of such adoption as a class 1 notice, under ch. 985. Alternatively, the notice may be posted as provided under s. 10.05. The notice need not set forth the full contents of the resolution, but shall state the maximum amount proposed to be borrowed, the purpose thereof, that the resolution was adopted under this subsection, and the place where, and the hours during which, the resolution may be inspected. If, within 30 days after publication or posting, a petition conforming to the requirements of s. 8.40 is filed with the school district clerk for a referendum on the resolution signed by at least 7,500 electors of the district or at least 20 percent of the number of district electors voting for governor at the last general election, as determined under s. 115.01 (13), whichever is the lesser, then the resolution shall not be effective unless adopted by a majority of the district electors voting at the referendum. The referendum shall be called in the manner provided under s. 67.05 (6a), except that the question which appears on the ballot shall be “Shall .... (name of district) borrow the sum of $.... for (state purpose) by issuing its general obligation promissory note (or notes) under section 67.12 (12) of the Wisconsin Statutes?”.

67.12(12)(e)2g. 2g. Subdivision 2. applies only if the amount of money to be raised by the promissory note will cause the aggregate amount of outstanding indebtedness of the school district incurred without a referendum since August 9, 1989, excluding amounts specified in s. 67.05 (6a) (bm), to exceed $1,000,000 or an amount determined as follows, whichever is less:

67.12(12)(e)2g.a. a. Divide the full value of all taxable property in all school districts operating a high school, as determined under s. 121.06 (1), by the total membership, as defined in s. 121.004 (5), of all school districts.

67.12(12)(e)2g.b. b. Multiply the quotient under subd. 2g. a. by 0.015.

67.12(12)(e)2g.c. c. Multiply the product under subd. 2g. b. by the school district membership, as defined in s. 121.004 (5).

67.12(12)(e)2r. 2r. For a school district from which territory is detached to create a new school district under s. 117.105, the amounts specified and calculated under subd. 2g. shall be increased, for the construction of a building or an addition to a building only, by the amount determined as follows:

67.12(12)(e)2r.a. a. Determine the number of pupils in each grade level who attended school in the previous school year in a building that was then owned by the school district and has been allocated to another school district by the reorganization and who resided in the previous school year in territory that was not transferred to the other school district. The number shall be the average of such pupils enrolled on the 3rd Friday of September and the 2nd Friday of January.

67.12(12)(e)2r.b. b. The department of safety and professional services shall determine, for each grade level in which pupils attended school in a building described in subd. 2r. a., the average cost per square foot for, and the average number of square feet per pupil included in, 2 recently constructed school buildings that were designed to serve pupils of that grade level, as selected by that department.

67.12(12)(e)2r.c. c. For each grade level, multiply the number determined under subd. 2r. a. by the product of the 2 numbers determined under subd. 2r. b., and total the results.

67.12(12)(e)3. 3. When a school district board adopts a resolution to borrow a sum in excess of $5,000 under this section for a stated purpose and a sufficient petition for referendum is not filed within the time permitted under subd. 2., or if such petition is filed and the question is approved at referendum, then the power of the board to borrow the sum and expend the sum for the purpose stated shall be deemed approved by the school district electors upon the expiration of the time for filing the petition or accomplishment of the referendum, whichever is applicable.

67.12(12)(e)4. 4. If a school board adopts a resolution to borrow a sum not exceeding $5,000 under this section, or if a school board adopts a resolution to borrow a sum in excess of $5,000 but subd. 2. does not apply, the school board has the power to borrow and spend the sum for the purpose stated without the approval of the electors of the school district.

67.12(12)(e)5. 5. Within 10 days of the adoption by a technical college district board of a resolution under subd. 1. to issue a promissory note for a purpose under s. 38.16 (2), the secretary of the district board shall publish a notice of such adoption as a class 1 notice, under ch. 985. The notice need not set forth the full contents of the resolution, but shall state the amount proposed to be borrowed, the method of borrowing, the purpose thereof, that the resolution was adopted under this subsection and the place where and the hours during which the resolution is available for public inspection. If the amount proposed to be borrowed is for building remodeling or improvement and does not exceed $1,500,000 or is for movable equipment, the district board need not submit the resolution to the electors for approval unless, within 30 days after the publication or posting, a petition conforming to the requirements of s. 8.40 is filed with the secretary of the district board requesting a referendum at a special election to be called for that purpose. Such petition shall be signed by electors from each county lying wholly or partially within the district. The number of electors from each county shall equal at least 1.5 percent of the population of the county as determined under s. 16.96 (2) (c). If a county lies in more than one district, the technical college system board shall apportion the county’s population as determined under s. 16.96 (2) (c) to the districts involved and the petition shall be signed by electors equal to the appropriate percentage of the apportioned population. In lieu of a special election, the district board may specify that the referendum shall be held at the next succeeding spring primary or election or partisan primary or general election. Any resolution to borrow amounts of money in excess of $1,500,000 for building remodeling or improvement shall be submitted to the electors of the district for approval. If a referendum is held or required under this subdivision, no promissory note may be issued until the issuance is approved by a majority of the district electors voting at such referendum. The referendum shall be noticed, called and conducted under s. 67.05 (6a) insofar as applicable, except that the notice of special election and ballot need not embody a copy of the resolution and the question which shall appear on the ballot shall be “Shall .... (name of district) be authorized to borrow the sum of $.... for (state purpose) by issuing its general obligation promissory note (or notes) under section 67.12 (12) of the Wisconsin Statutes?”

67.12(12)(e)6. 6. A copy of any resolution of the district board under subd. 5. which requires a referendum shall be promptly transmitted by the secretary of the district board to the county clerk or board of election commissioners of each county any part of which is contained within the district. A copy of the resolution shall be filed as provided in s. 8.37. Costs of the referendum shall be borne as provided in ss. 5.68 and 7.03.

67.12(12)(e)7. 7. Notes issued by technical college districts under the authority of this subsection prior to July 1, 1977 and without approval thereof by the electors of such districts are not invalid because of the absence of such approval. Such notes are valid and binding obligations of such district if in all other respects issued in accordance with the law pertaining thereto.

67.12(12)(ee) (ee) The governing body of any municipality proceeding to issue a promissory note under this subsection shall, before issuing the note, levy a direct, annual tax sufficient in amount to pay and for the express purpose of paying the interest on the note as it falls due and to pay and discharge the principal thereof at maturity. The municipality may not repeal such levy or in any way obstruct the collection of the tax until all such payments have been made or provided for. Any such tax shall be carried into the tax roll each year and collected as other taxes are collected until all payments on the note have been provided for, except that the amount of tax carried into the tax roll may be reduced in any year by the amount of any surplus in the debt service fund account under s. 67.11. The municipality may make an appropriation to provide funds for payments coming due on any note, whether or not the note has been authorized, prior to the first collection of the taxes levied for those payments. The amount of the appropriation shall be based on estimates of the amount of notes to be sold and the rate of interest the notes will bear. The municipality may not use the appropriation for any purpose other than that for which appropriated and shall transfer any surplus in the appropriation to the general fund of the municipality. Notwithstanding par. (e) 1., the municipality is not required to levy a tax equal to the amount of that appropriation.

67.12(12)(f) (f) Paragraph (e) 2. does not apply to borrowing by a school district from the state trust funds under subch. II of ch. 24 if the trust fund loan is for a distance education project and the loan has been approved by the board of control of the cooperative educational service agency in which the school district participates.

67.12(12)(g) (g) A common school district, union high school district or unified school district may, upon compliance with the requirements of this section, issue its note or notes in order to provide funds allocated under the contract to the school district as a participant in a contract under s. 120.25.

67.12(12)(h) (h) Paragraph (e) 2. does not apply to borrowing by the school board of a school district created by a reorganization under s. 117.105, or by the school board from which territory is detached to create a school district under s. 117.105, for the purpose of financing any assets or liabilities apportioned to the school district or assets apportioned to another school district under s. 117.105 (1m), (2m), or (4m).

67.12(12)(k) (k) Paragraph (e) 5. does not apply to borrowing by a technical college district board to purchase or construct a facility to be used as an applied technology center if s. 38.15 (3) (c) applies.

67.12 History History: 1971 c. 49, 144; 1971 c. 152 s. 38; 1971 c. 164, 215; 1973 c. 172, 250; 1975 c. 311; 1977 c. 29; 1977 c. 272 s. 98; 1977 c. 418; 1979 c. 34; 1979 c. 110 s. 60 (13); 1979 c. 221, 297; 1981 c. 20, 254; 1981 c. 282 ss. 29, 45; 1981 c. 314; 1983 a. 24, 27, 192, 207, 368, 538; 1985 a. 101, 225; 1987 a. 197, 391, 399, 403; 1989 a. 31, 56, 192, 336, 366; 1991 a. 32, 49; 1993 a. 399; 1995 a. 27, 227, 232, 358; 1997 a. 35, 286; 1999 a. 9; 1999 a. 150 s. 672; 1999 a. 182; 2001 a. 16; 2003 a. 43; 2007 a. 115, 188; 2009 a. 28, 180; 2011 a. 32, 75; 2015 a. 55; 2017 a. 59; 2017 a. 207 s. 5; 2023 a. 6, 128.

67.12 Annotation Sub. (12) (e) 5. and 6. permit a vocational, technical and adult education (technical college) district board to initiate a referendum on borrowing by issuing promissory notes, the result of which will be binding on the board. 63 Atty. Gen. 551.

67.15 67.15 Variable rate obligations.

67.15(1) (1) In this section:

67.15(1)(a) (a) “Credit facility” means a standby or direct payment letter of credit, an insurance policy or other commitment to pay the principal of, or interest on, a municipal obligation.

67.15(1)(b) (b) “Liquidity facility” means a standby or direct payment letter of credit or other commitment to purchase, or provide funds for the purchase of, a municipal obligation presented for purchase under a put option.

67.15(1)(c) (c) “Put option” means the right of the holder or owner of a municipal obligation to present that municipal obligation to the municipality which issued it, its designee or a 3rd party for purchase by that municipality, designee or 3rd party.

67.15(1)(d) (d) “Tendered obligation” means a municipal obligation which is presented for purchase when a put option is exercised.

67.15(1)(e) (e) “Variable interest rate” or “variable rate” means a rate of interest greater than zero which is subject to change from time to time under sub. (2).

67.15(1)(f) (f) “Variable rate obligation” means a municipal obligation which bears interest at a variable rate.

67.15(2) (2) Any municipal obligation issued under this chapter or ch. 66 may have a variable interest rate. If a municipality issues a municipal obligation with a variable interest rate, the governing body of the municipality shall adopt and record a resolution providing the following:

67.15(2)(a) (a) A procedure, method, formula or index by which the interest rate may change from time to time.

67.15(2)(b) (b) A stated maximum interest rate for the municipal obligation or for each maturity of the municipal obligation.

67.15(3) (3) A resolution under sub. (2) may provide for changing the interval at which the interest rate may change and for converting the variable rate to a fixed rate.

67.15(4) (4) In a resolution under sub. (2), a municipality may grant or provide for a put option for the holders or owners of any municipal obligation issued under the resolution and may provide in the resolution for the price at which tendered obligations will be purchased. A put option may provide for exercise at one or more designated times or upon a specified period of notice by holders and owners.

67.15(5) (5) A municipality may contract with a bank, trust company, investment banker or other financial institution, determined by the governing body of the municipality to be qualified, to act as the agent of the municipality in changing the interest rate of variable rate obligations under the procedure, method, formula or index established under sub. (2) (a), in changing the interval at which such interest rate may change and in purchasing and remarketing tendered obligations. A contract under this subsection may be on an exclusive basis, may be negotiated and may provide for payment of a fee to the agent based on a fixed annual amount, a percentage of the outstanding principal amount of the obligations, a percentage of the principal amount of obligations remarketed or any other criteria approved by the governing body of the municipality which is making the contract.

67.15(6) (6) A municipality may contract for the provision of a credit facility or a liquidity facility, or both. A contract under this subsection may be negotiated. A municipality may enter into a separate contract with any party furnishing such credit facility or liquidity facility to provide for repayment by the municipality of amounts paid by that party under the credit facility or liquidity facility, with interest on such amounts at a rate provided in the contract. A municipality’s obligation to reimburse a credit facility or liquidity facility for amounts advanced under a contract under this subsection may not be deemed additional debt of the municipality.

67.15(7) (7) Any variable rate obligation, including a bond issued under s. 67.04, which contains any put option allowing any holder or owner of the variable rate obligation to present the variable rate obligation for purchase within one year from the date of the variable rate obligation, may be sold at a public or private sale.

67.15(8) (8) The purchase of a tendered obligation by or on behalf of the municipality may not be deemed to be a redemption thereof, and the remarketing of a tendered obligation may not be deemed to be an issuance of that obligation.

67.15(9) (9) Any tax levied under s. 67.05 (10) or 67.12 (12) (e) 1. to pay the principal and interest on a variable rate obligation may be in an amount sufficient to pay the maximum amount of principal and interest which may be payable under the terms of the obligation or the terms of any contract under sub. (6). If, after payment of interest in any year, there is any amount remaining in the debt service account for the obligation which was collected for the purpose of paying interest on the obligation in that year, the amount of tax carried on to the tax roll for the next year may be reduced by that remaining amount.

67.15 History History: 1987 a. 310.

67.16 67.16 General obligation-local improvement bonds.

67.16(1) (1) In this section:

67.16(1)(a) (a) “Debt service fund” means the fund, however derived, set aside for the payment of principal and interest on bonds issued under this section.

67.16(1)(b) (b) “Governing body” means the body or board vested by statute with the power to levy special assessments for public improvement.

67.16(1)(c) (c) “Local governmental unit” means a county, city, village, town, farm drainage board, sanitary district, utility district, public inland lake protection and rehabilitation district or any other public board, commission or district, except a 1st class city, authorized by law to levy special assessments for public improvements against the property benefited by the special improvements.

67.16(1)(d) (d) “Public improvement” means the result of the performance of work or the furnishing of materials or both, for which special assessments are authorized to be levied against the property benefited by the special assessment.

67.16(2) (2) 

67.16(2)(a) (a) For the purpose of anticipating the collection of special assessments payable in installments under s. 66.0715 (3), the governing body of a local governmental unit, after the installments have been determined, may issue general obligation-local improvement bonds under this section.

67.16(2)(b) (b) The issue of general obligation-local improvement bonds shall be in an amount not exceeding the aggregate unpaid special assessments levied for the public improvement that the issue is to finance. A single issue of the bonds may be used to finance one or more different local improvements for which special assessments are authorized to be made in the same year. Sections 67.035, 67.06, 67.07, 67.08 and 67.11, where not contrary to the provisions of this section, apply to the bonds. The bonds shall mature in the same number of installments as the underlying special assessments, but the date of maturity of each installment of the bonds shall be fixed in October, November or December. The first maturity of the bonds may be in the 2nd year following the date of levy of the first installment of the underlying special assessment. At the time that the bonds are authorized, the governing body of the local governmental unit shall levy a tax upon all the taxable property of the local governmental unit sufficient to provide for the payment of the principal and interest of the bonds at maturity. The tax levy is irrepealable. All collections of installments of the special assessments levied to pay for the public improvement, either before or after delinquency, shall be placed by the treasurer of the local governmental unit in a special debt service fund, designated and identified for the issue of the bonds, and shall be used only for the payment of the bonds and interest of the issue. The annual installment of the irrepealable tax levied for the purpose of payment of the bonds and interest on the bonds shall be diminished by the amount on hand in the debt service fund on November 1 of each tax levy year after deducting any unpaid interest and principal due in that year, and the amount on hand in the fund shall be applied to the payment of the next succeeding installment of principal and interest named on the bonds. Any deficiency in the debt service fund for the payment of the bonds and interest at maturity shall be paid out of the general fund of the local governmental unit and the general fund shall be reimbursed from the collection of that part of the irrepealable tax that is actually levied. Any surplus in the debt service fund after all bonds and interest are fully paid shall be paid into the general fund.

67.16(2)(c) (c) If any installment of the special assessment that is entered in the tax roll is not paid to the treasurer of the local governmental unit with the other taxes, it shall be returned to the county treasurer as delinquent in trust for collection.

67.16(3) (3) After the expiration of 90 days from the date of a general obligation-local improvement bond, the bond is conclusive evidence of the legality of all proceedings up to and including the issue of the bond and prima facie evidence of the proper construction of the improvement.