Indiana Quarterly Tax Calculator
Calculate your estimated quarterly tax payments for federal and Indiana state taxes. Designed for self-employed individuals, freelancers, and independent contractors.
IN State Tax: Flat 3.0%
Quarterly Payment Amount
$6,160
Per quarter (4 remaining)
Annual Tax Breakdown
2026 Payment Schedule
Jan 1 - Mar 31
Due: April 15, 2026
$6,160
Apr 1 - May 31
Due: June 15, 2026
$6,160
Jun 1 - Aug 31
Due: September 15, 2026
$6,160
Sep 1 - Dec 31
Due: January 15, 2027
$6,160
Don't miss your quarterly payments!
The IRS may charge penalties and interest if you underpay or pay late. Consider setting up automatic payments or calendar reminders.
Indiana Quarterly Tax Highlights
Indiana has a flat 3.05% state income tax rate
One of the lowest flat tax rates in the country
Counties may add local income tax (0.5% to 3%)
Use Form IT-40ES for quarterly payments
Indiana Quarterly Tax FAQ
What is Indiana's income tax rate?
Indiana has a flat 3.05% state income tax rate. However, most counties add a local income tax ranging from 0.5% to about 3%, so your total rate may be higher depending on where you live.
Indiana Estimated Quarterly Tax Payments for Self-Employed Workers in 2026
Self-employed workers in Indiana face two tax obligations: federal estimated taxes filed with the IRS and state estimated taxes filed with the Indiana Department of Revenue. Indiana imposes a flat 3.05% income tax rate on all taxable income. If you expect to owe $1,000 or more in Indiana state income tax after withholding and credits, you must make quarterly estimated payments using Form IT-40ES.
Indiana has one of the lowest flat state income tax rates. However, all 92 Indiana counties impose an additional local income tax ranging from 0.5% to about 3%, which can significantly increase your total state and local tax burden.
| Tax Layer | Rate / Range | Filed With | Form |
|---|---|---|---|
| Federal income tax | 10% – 37% | IRS | 1040-ES |
| Self-employment tax | 15.3% | IRS | 1040-ES / SE |
| Indiana state income tax | 3.05% | Indiana Department of Revenue | Form IT-40ES |
How Indiana's Flat 3.05% Income Tax Affects Your Quarterly Payments
Indiana uses a flat tax rate of 3.05%, which simplifies quarterly tax calculations. Regardless of income level, every dollar of taxable income is taxed at the same rate. This makes it straightforward to estimate your state quarterly payments — simply multiply your projected net self-employment income by 3.05% and divide by four.
For a single self-employed worker in Indiana earning $100,000 in net self-employment income, the estimated annual tax breakdown is:
| Tax Component | Estimated Amount | Calculation Basis |
|---|---|---|
| Federal income tax | ~$11,600 | After $15,700 standard deduction, 2026 brackets |
| Self-employment tax | ~$14,130 | 15.3% on 92.35% of net earnings |
| Indiana state income tax | ~$3,050 | 3.05% flat rate |
| Total annual tax | ~$28,780 | |
| Quarterly payment | ~$7,195 | Total / 4 quarters |
State payments can be made online through the Indiana Department of Revenue portal at in.gov/dor, by mail with a Form IT-40ES voucher, or via electronic funds transfer where available.
Federal Self-Employment Tax and Quarterly Due Dates
All self-employed workers must pay federal self-employment (SE) tax of 15.3% on 92.35% of net earnings. This consists of 12.4% for Social Security (on earnings up to $184,500 in 2026) and 2.9% for Medicare (no cap). An additional 0.9% Medicare surtax applies to earnings above $200,000 (single filers).
Both Indiana and federal estimated tax payments follow the same quarterly schedule:
| Quarter | Income Period | Due Date |
|---|---|---|
| Q1 | January 1 – March 31 | April 15, 2026 |
| Q2 | April 1 – May 31 | June 15, 2026 |
| Q3 | June 1 – August 31 | September 15, 2026 |
| Q4 | September 1 – December 31 | January 15, 2027 |
To avoid underpayment penalties, pay at least 100% of your prior-year tax liability (or 110% if your AGI exceeds $150,000) spread across four equal payments, or at least 90% of your current-year tax. You can deduct 50% of your self-employment tax from your adjusted gross income, reducing both your federal and Indiana taxable income.
Related Calculators
Official References
This calculator uses current federal and Indiana tax rates and schedules:
- IRS Estimated Tax Guidelines
Federal quarterly tax requirements and Form 1040-ES
- Indiana Department of Revenue
Official Indiana tax authority
- IRS Self-Employment Tax
Social Security and Medicare tax information
This calculator provides estimates based on 2026 tax rates. Your actual tax liability may vary based on deductions, credits, and other factors. Consult a tax professional for personalized advice.