SECTION 1. [Rule of taxation uniform; income, privilege and occupation taxes.] The rule of taxation shall be uniform but the legislature may empower cities, villages or towns to collect and return taxes on real estate located therein by optional methods. Taxes shall be levied upon such property with such classifications as to forests and minerals including or separate or severed from the land, as the legislature shall prescribe. Taxation of agricultural land and undeveloped land, both as defined by law, need not be uniform with the taxation of each other nor with the taxation of other real property. Taxation of merchants' stock-in-trade, manufacturers' materials and finished products, and livestock need not be uniform with the taxation of real property and other personal property, but the taxation of all such merchants' stock-in-trade, manufacturers' materials and finished products and livestock shall be uniform, except that the legislature may provide that the value thereof shall be determined on an average basis. Taxes may also be imposed on incomes, privileges and occupations, which taxes may be graduated and progressive, and reasonable exemptions may be provided.

SECTION 2. [Appropriations; limitation.] No money shall be paid out of the treasury except in pursuance of an appropriation by law. No appropriation shall be made for the payment of any claim against the state except claims of the United States and judgments, unless filed within six years after the claim accrued.

SECTION 3. [Credit of state.] Except as provided in s. 7 (2) (a), the credit of the state shall never be given, or loaned, in aid of any individual, association or corporation.

SECTION 4. [Contracting state debts.] The state shall never contract any public debt except in the cases and manner herein provided.

SECTION 5. [Annual tax levy to equal expenses.] The legislature shall provide for an annual tax sufficient to defray the estimated expenses of the state for each year; and whenever the expenses of any year shall exceed the income, the legislature shall provide for levying a tax for the ensuing year, sufficient, with other sources of income, to pay the deficiency as well as the estimated expenses of such ensuing year.

SECTION 6. [Public debt for extraordinary expense; taxation.] For the purpose of defraying extraordinary expenditures the state may contract public debts (but such debts shall never in the aggregate exceed one hundred thousand dollars). Every such debt shall be authorized by law, for some purpose or purposes to be distinctly specified therein; and the vote of a majority of all the members elected to each house, to be taken by yeas and nays, shall be necessary to the passage of such law; and every such law shall provide for levying an annual tax sufficient to pay the annual interest of such debt and the principal within five years from the passage of such law, and shall specially appropriate the proceeds of such taxes to the payment of such principal and interest; and such appropriation shall not be repealed, nor the taxes be postponed or diminished, until the principal and interest of such debt shall have been wholly paid.

SECTION 7. [Public debt for public defense; bonding for public purposes.]

(1) The legislature may also borrow money to repel invasion, suppress insurrection, or defend the state in time of war; but the money thus raised shall be applied exclusively to the object for which the loan was authorized, or to the repayment of the debt thereby created.

(2) Any other provision of this constitution to the contrary notwithstanding:

(a) The state may contract public debt and pledges to the payment thereof its full faith, credit and taxing power:
1. To acquire, construct, develop, extend, enlarge or improve land, waters, property, highways, railways, buildings, equipment or facilities for public purposes.
2. To make funds available for veterans' housing loans.

(b) The aggregate public debt contracted by the state in any calendar year pursuant to paragraph (a) shall not exceed an amount equal to the lesser of-
1. Three-fourths of one per centum of the aggregate value of all taxable property in the state; or
2. Five per centum of the aggregate value of all taxable property in the state less the sum of: a. the aggregate public debt of the state contracted pursuant to this section outstanding as of January 1 of such calendar year after subtracting therefrom the amount of sinking funds on hand on January 1 of such calendar year which are applicable exclusively to repayment of such outstanding public debt and, b. the outstanding indebtedness as of January 1 of such calendar year of any entity of the type described in paragraph (d) to the extent that such indebtedness is supported by or payable from payments out of the treasury of the state.

(c) The state may contract public debt, without limit, to fund or refund the whole or any part of any public debt contracted pursuant to paragraph (a), including any premium payable with respect thereto and any interest to accrue thereon, or to fund or refund the whole or any part of any indebtedness incurred prior to January 1, 1972, by any entity of the type described in paragraph (d), including any premium payable with respect thereto and any interest to accrue thereon.

(d) No money shall be paid out of the treasury, with respect to any lease, sublease or other agreement entered into after January 1, 1971, to the Wisconsin State Agencies Building Corporation, Wisconsin State Colleges Building Corporation, Wisconsin State Public Building Corporation, Wisconsin University Building Corporation or any similar entity existing or operating for similar purposes pursuant to which such nonprofit corporation or such other entity undertakes to finance or provide a facility for use or occupancy by the state or an agency, department or instrumentality thereof.

(e) The legislature shall prescribe all matters relating to the contracting of public debt pursuant to paragraph (a), including: the public purposes for which public debt may be contracted; by vote of a majority of the members elected to each of the 2 houses of the legislature, the amount of public debt which may be contracted for any class of such purposes; the public debt or other indebtedness which may be funded or refunded; the kinds of notes, bonds or other evidence of public debt which may be issued by the state; and the manner in which the aggregate value of all taxable property in the state shall be determined.

(f) The full faith, credit and taxing power of the state are pledged to the payment of all public debt created on behalf of the state pursuant to this section and the legislature shall provide by appropriation for the payment of the interest upon and instalments of principal of all such public debt as the same falls due, but, in any event, suit may be brought against the state to compel such payment.

(g) At any time after January 1, 1972, by vote of a majority of the members elected to each of the 2 houses of the legislature, the legislature may declare that an emergency exists and submit to the people a proposal to authorize the state to contract a specific amount of public debt for a purpose specified in such proposal, without regard to the limit provided in paragraph (b). Any such authorization shall be effective if approved by a majority of the electors voting thereon. Public debt contracted pursuant to such authorization shall thereafter be deemed to have been contracted pursuant to paragraph (a), but neither such public debt nor any public debt contracted to fund or refund such public debt shall be considered in computing the debt limit provided in paragraph (b). Not more than one such authorization shall be thus made in any 2-year period.

SECTION 8. [Vote on fiscal bills; quorum.] On the passage in either house of the legislature of any law which imposes, continues or renews a tax, or creates a debt or charge, or makes, continues or renews an appropriation of public or trust money, or releases, discharges or commutes a claim or demand of the state, the question shall be taken by yeas and nays, which shall be duly entered on the journal; and three-fifths of all the members elected to such house shall in all such cases be required to constitute a quorum therein.

SECTION 9. [Evidences of public debt.] No scrip, certificate, or other evidence of state debt, whatsoever, shall be issued, except for such debts as are authorized by the sixth and seventh sections of this article.

SECTION 10. [Internal improvements.] Except as further provided in this section, the state may never contract any debt for works of internal improvement, or be a party in carrying on such works.

(1) Whenever grants of land or other property shall have been made to the state, especially dedicated by the grant to particular works of internal improvement, the state may carry on such particular works and shall devote thereto the avails of such grants, and may pledge or appropriate the revenues derived from such works in aid of their completion.

(2) The state may appropriate money in the treasury or to be thereafter raised by taxation for:

(a) The construction or improvement of public highways.

(b) The development, improvement and construction of airports or other aeronautical projects.

(c) The acquisition, improvement or construction of veterans' housing.

(d)The improvement of port facilities.

(e) The acquisition, development, improvement or construction of railways and other railroad facilities.

(3) The state may appropriate moneys for the purpose of acquiring, preserving and developing the forests of the state. Of the moneys appropriated under the authority of this subsection in any one year an amount not to exceed two-tenths of one mill of the taxable property of the state as determined by the last preceding state assessment may be raised by a tax on property.