Gross Income Tax (general corporations)
| Timeframe | High Rate | Low Rate |
|---|---|---|
| May 1933 - June 1963 | 1.00 % | .250% |
| July 1963 - Feb. 1973 | 2.00% | .500% |
| April - Dec. 1973 | 1.90% | .475% |
| 1974 | 1.80% | .450% |
| 1975 | 1.70% | .425% |
| 1976 | 1.60% | .400% |
| 1977 | 1.55% | .3875% |
| 1978 | 1.50% | .375% |
| 1979 | 1.45% | .3623% |
| 1980 | 1.40% | .350% |
| 1981 | 1.35% | .3375% |
| 1982 - 1984 | 1.30% | .325% |
| 1985 | 1.25% | .3125% |
| 1986 - 2002 | 1.20% | .300% |
| 2003 | 0% | 0% (repealed Jan. 1, 2003) |
Adjusted Gross Income Tax (general corporations, non-financial institutions)
| Timeframe | Rate |
|---|---|
| July 1963 - 1972 | 2.00% |
| 1973 - 1986 | 3.00% |
| Jan. - June 1987 | 3.20% |
| July 1, 1987 - 2002 | 3.40% |
| 2003 - June 30, 2012 | 8.50% |
| July 1, 2012 - June 30, 2013 | 8.00% |
| July 1, 2013 - June 30, 2014 | 7.50% |
| July 1, 2014 - June 30, 2015 | 7.00% |
| July 1, 2015 - June 30, 2016 | 6.50% |
| July 1, 2016 - June 30, 2017 | 6.25% |
| July 1, 2017 - June 30, 2018 | 6.00% |
| July 1, 2018 - June 30, 2019 | 5.75% |
| July 1, 2019 - June 30, 2020 | 5.50% |
| July 1, 2020 - June 30, 2021 | 5.25% |
| July 1, 2021 - Present | 4.90% |
Supplemental Net Income Tax (all corporations, financial institutions until 1989)
| Timeframe | Rate |
|---|---|
| 1973 - 1974 | 2.00% |
| 1975 - 1976 | 2.50% |
| 1977 - 1980 | 3.00% |
| 1982 - 1986 | 4.00% |
| 1987 - 2002 | 4.50% |
| Jan. 1, 2003 (repealed) | 0% |
Financial Institutions Tax (replaced former bank taxes)
| Timeframe | Rate |
|---|---|
| 1990 - 2013 | 8.50% |
| Jan. 1, 2014 - Dec. 31, 2014 | 8.00% |
| Jan. 1, 2015 - Dec. 31, 2015 | 7.50% |
| Jan. 1, 2016 - Dec. 31, 2016 | 7.00% |
| Jan. 1, 2017 - Dec. 31, 2017 | 6.50% |
| Jan. 1, 2018 - Dec. 31, 2018 | 6.50% |
| Jan. 1, 2019 - Dec. 31, 2019 | 6.25% |
| Jan. 1, 2020 - Dec. 31, 2020 | 6.00% |
| Jan. 1, 2021 - Dec. 31, 2021 | 5.50% |
| Jan. 1, 2022 - Dec. 31, 2022 | 5.00% |
| Jan. 1, 2023 - Present | 4.90% |
Utility Receipts Tax (retail sales of utility services)
| Timeframe | Rate |
|---|---|
| 2003 - Present | 1.40% |
| 2003 - 2021 | 1.40% |
| Jan. 1, 2022 - June 30, 2022 | 1.46% |
| July 1, 2022 (repealed) | 0% |
Utility Service Use Tax (use tax sales of utility services)
| Timeframe | Rate |
|---|---|
| 2006 - Present | 1.40% |
| 2006 - 2021 | 1.40% |
| Jan. 1, 2022 - June 30, 2022 | 1.46% |
| July 1, 2022 (repealed) | 0% |
Sales Tax Rate History
| Effective Date | Rate |
|---|---|
| April 1, 2008 - Present | 7.00% |
| Dec. 1, 2002 - March 31, 2008 | 6.00% |
| Jan. 1, 1983 | 5.00% |
| May 1, 1973 | 4.00% |
| Oct. 24, 1963 (sales tax first adopted) | 2.00% |