Enterprise
Individual & Small Business
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Federal 2026 estimated tax due dates, for comparison: April 15, 2026, June 15, 2026, September 15, 2026, January 15, 2027.
Who must pay Indiana estimated tax?
Generally, if you owe $1,000 or more in state and county tax for the year that's not covered by withholding taxes, you need to make estimated tax payments throughout the year.
How do you avoid a Indiana underpayment penalty?
Penalty (10% of the underpayment per installment period) may apply if credits including estimates are less than 90% of this year's tax or 100% of last year's tax (110% of last year's tax if federal AGI is more than $150,000 for single/MFJ, or more than $75,000 MFS). Schedule IT-2210/IT-2210A.
Are there local estimated payments?
Indiana county income tax is included: the $1,000 threshold and estimated payments cover combined state and county tax, paid together to the Indiana DOR (no separate county estimates).
How much should you pay?
Start with your federal estimate: the free Quarterly Estimated Tax Calculator works out your 2026 federal payments and safe harbor. Indiana figures its own tax, so the state amount is separate.