2027 Indiana Tax Deadlines

Last updated: July 29, 2026

Key Indiana tax dates at a glance

This block is the single date reference for 2027 Indiana filing, payment, estimated-payment, and extension planning.

• April 15, 2027: First Indiana estimated payment for calendar-year Individuals.
• June 15, 2027: Second Indiana estimated payment.
• September 15, 2027: Third Indiana estimated payment.
• January 18, 2028: Fourth Indiana estimated payment.
• April 18, 2028: Indiana Individual, S Corporation, and Partnership returns and balances due for calendar-year filers.
• May 15, 2028: Indiana C Corporation return and balance due for calendar-year filers.
• October 16, 2028: Extended Indiana S Corporation and Partnership returns due; payment is not extended.
• November 15, 2028: Extended Indiana Individual and C Corporation returns due; payment is not extended.

When are Indiana taxes due in 2027?

Indiana's 2027 calendar-year Individual, S Corporation, and Partnership returns are generally due April 18, 2028, while C Corporation returns are due May 15, 2028. Estimated payments and filing-only extensions should be tracked separately by taxpayer type. Indiana's statewide Individual adjusted gross income tax rate is 2.90% for 2027 before county income tax.

When are Indiana C Corporation taxes due for 2027?

Indiana C Corporations file Form IT-20 by May 15, 2028, and pay the expected balance by May 15, 2028. Indiana C Corporations use the fifth-month deadline and file the Indiana Corporate Adjusted Gross Income Tax Return. Use INTIME for supported payments, account access, and correspondence.

What does the Indiana C Corporation extension change?

The extended filing deadline for a calendar-year Indiana C Corporation return is November 15, 2028. The extension gives more time to file, not more time to pay, so the expected balance remains due May 15, 2028.

When are Indiana S Corporation and Partnership taxes due for 2027?

Indiana S Corporations file Form IT-20S and Partnerships file Form IT-65 by April 18, 2028.

What pass-through payment rules should teams watch?

Indiana pass-through entities may have nonresident-owner withholding through Form IT-6WTH and may elect PTET through the return and Schedule PTET. A filing extension does not postpone these payment and election controls. The projected extended filing deadline is October 16, 2028; payment and election deadlines are not automatically postponed.

When are Indiana Individual taxes due for 2027?

An Indiana Individual return using Form IT-40 for full-year residents and Form IT-40PNR for part-year or nonresident filers is due by April 18, 2028, and any remaining state income tax should be paid by April 18, 2028.

When is the Indiana Individual extension deadline?

The extended filing deadline for a 2027 Indiana Individual income tax return is November 15, 2028. The extension applies to filing only, so the payment deadline remains April 18, 2028.

When are Indiana estimated payments due?

Calendar-year Indiana estimated payments are due on this schedule:

• April 15, 2027.
• June 15, 2027.
• September 15, 2027.
• January 18, 2028.

Who must make Indiana estimated payments?

Taxpayers who expect an Indiana income-tax balance after withholding and credits may need estimated payments. Apply the tax-year 2027 threshold, safe-harbor, and voucher instructions when the filing-year guidance is released.

What Indiana rules should tax professionals watch for 2027?

Beyond the main filing calendar, Indiana has county tax and pass-through payment items that should be tracked separately:

How does Indiana county income tax affect Individual returns?

County income tax depends on residence and work-location rules, so county coding and local rates should be reviewed separately from the statewide Individual rate.

What pass-through withholding and PTET items need separate tracking?

Nonresident withholding, Form IT-6WTH, PTET election data, and Schedule PTET can create payment and owner-reporting work outside the main filing deadline.

Why do Indiana C Corporations use a different calendar?

Indiana C Corporations use a fifth-month return deadline, so their May 15, 2028 due date should not be merged into the April 18, 2028 pass-through and Individual calendar.

Tax-professional context: Indiana return calendars, entity-level elections, owner reporting, withholding, and payment rules require a state-specific review. TY2027 forms and the final 2028 filing calendar remain subject to confirmation when the state publishes them.

Electronic filing requirements: Indiana uses INTIME for supported account management, filing, correspondence, and payment services. Use approved software for supported corporate, pass-through, and Individual returns. Use INTIME for eligible payments and account work. Review state electronic-filing mandates separately from federal requirements. Keep proof of timely electronic submission and payment with the workpapers.

County income tax system: Indiana county income tax depends on the applicable residence and work rules, so the local rate and county coding need separate review.

Nonresident withholding and PTET: Pass-through entities may have nonresident withholding obligations and may elect PTET, creating additional entity and owner reporting.

Different entity calendars: Indiana C Corporations use a fifth-month due date while pass-through returns use the fourth month.

What sources support these Indiana deadlines?

• Indiana DOR Tax Chapter.
• Indiana DOR Current Corporate and Partnership Forms.
• Indiana Nonresident Withholding FAQ.
• Indiana PTET FAQ.

Indiana tax deadlines for county and entity filings

Indiana teams have to keep corporate returns, pass-through obligations, Individual filing work, and local county considerations aligned. Instead's AI-driven tax platform gives each deadline a clear owner and workflow.

Use filing for return execution, integrations to keep source data connected, and research to route Indiana review steps before the deadline. Built for tax professionals who want a better tax operation system to manage compliance and advisory work for clients.