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For taxable years beginning after December 31, 1998, and before January 1, 2000, the maximum dollar amount in each tax bracket, and the corresponding minimum dollar amount in the next bracket, under subs. (1m) and (2) (c) and (d) [s. 71.06 (1m), 2023 stats., s. 71.06 (2) (c), 2023 stats., and s. 71.06 (2) (d), 2023 stats.], and for taxable years beginning after December 31, 1999, and before January 1, 2025, the maximum dollar amount in each tax bracket, and the corresponding minimum dollar amount in the next bracket, under subs. (1n), (1p) (a) to (c), (1q) (a) and (b), and (2) (e), (f), (g) 1. to 3., (h) 1. to 3., (i) 1. and 2., and (j) 1. and 2. [subs. (1q) (a) and (b) and (2) (i) 1. and 2. and (j) 1. and 2. and s. 71.06 (1n), 2023 stats., s. 71.06 (1p) (a) to (c), 2023 stats., s. 71.06 (2) (e), 2023 stats., s. 71.06 (2) (f), 2023 stats., s. 71.06 (2) (g) 1. to 3., 2023 stats., and s. 71.06 (2) (h) 1. to 3., 2023 stats.], shall be increased each year by a percentage equal to the percentage change between the U.S. consumer price index for all urban consumers, U.S. city average, for the month of August of the previous year and the U.S. consumer price index for all urban consumers, U.S. city average, for the month of August 1997, as determined by the federal department of labor, except that for taxable years beginning after December 31, 2000, and before January 1, 2002, the dollar amount in the top bracket under subs. (1p) (c) and (d), (2) (g) 3. and 4. and (h) 3. and 4. [s. 71.06 (1p) (c), 2023 stats., s. 71.06 (1p) (d), 2023 stats., s. 71.06 (2) (g) 3., 2023 stats., s. 71.06 (2) (g) 4., 2023 stats., s. 71.06 (2) (h) 3., 2023 stats., and s. 71.06 (2) (h) 4., 2023 stats.,] shall be increased by a percentage equal to the percentage change between the U.S. consumer price index for all urban consumers, U.S. city average, for the month of August of the previous year and the U.S. consumer price index for all urban consumers, U.S. city average, for the month of August 1999, as determined by the federal department of labor, except that for taxable years beginning after December 31, 2011, the adjustment may occur only if the resulting amount is greater than the corresponding amount that was calculated for the previous year.
For taxable years beginning after December 31, 2009, and before January 1, 2025, the maximum dollar amount in each tax bracket, and the corresponding minimum dollar amount in the next bracket, under subs. (1p) (d), (1q) (c), and (2) (g) 4., (h) 4., (i) 3., and (j) 3. [subs. (1q) (c) and (2) (i) 3. and (j) 3. and s. 71.06 (1p) (d), 2023 stats., s. 71.06 (2) (g) 4., 2023 stats., and s. 71.06 (2) (h) 4., 2023 stats.], and the dollar amount in the top bracket under subs. (1p) (e), (1q) (d), and (2) (g) 5., (h) 5., (i) 4., and (j) 4. [subs. (1q) (d) and (2) (i) 4. and (j) 4. and s. 71.06 (1p) (e), 2023 stats., s. 71.06 (2) (g) 5., 2023 stats., and s. 71.06 (2) (h) 5., 2023 stats.], shall be increased each year by a percentage equal to the percentage change between the U.S. consumer price index for all urban consumers, U.S. city average, for the month of August of the previous year and the U.S. consumer price index for all urban consumers, U.S. city average, for the month of August 2008, as determined by the federal department of labor, except that for taxable years beginning after December 31, 2011, the adjustment may occur only if the resulting amount is greater than the corresponding amount that was calculated for the previous year.
For taxable years beginning after December 31, 2025, the maximum dollar amount in each tax bracket, and the corresponding minimum dollar amount in the next bracket, under subs. (1r) and (2) (k) and (L), shall be increased each year by a percentage equal to the percentage change between the U.S. consumer price index for all urban consumers, U.S. city average, for the month of August of the previous year and the U.S. consumer price index for all urban consumers, U.S. city average, for the month of August 2024, as determined by the federal department of labor, except that the adjustment may occur only if the resulting amount is greater than the corresponding amount that was calculated for the previous year.
Each amount that is revised under this subsection shall be rounded to the nearest multiple of $10 if the revised amount is not a multiple of $10 or, if the revised amount is a multiple of $5, such an amount shall be increased to the next higher multiple of $10. The department of revenue shall annually adjust the changes in dollar amounts required under this subsection and incorporate the changes into the income tax forms and instructions.