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Iowa business tax extension

Iowa extends Form IA 1120 automatically by 6 months, with no extension request and no federal extension needed. The federal extension is Form 7004, due for calendar-year corporations and for partnerships and S corporations. In general, an extension gives you more time to file, not more time to pay.

Last updated · From Iowa's own forms, instructions and laws, cited below

Does Iowa accept the federal extension?

Iowa extends the return automatically, with no extension request and no federal extension needed.

Iowa's rules for each business return, as its own instructions and laws state them:

Corporations

Return
Form IA 1120, Iowa Corporation Income Tax Return (42-001)
Due date
The last day of the 4th month after the tax year ends (April 30 for a calendar year)
Extension
Iowa extends the return automatically, with no extension request and no federal extension needed. The extra six months apply only if at least 90% of the correct tax is paid by the original due date.
Extension length
6 months
Payment
The tax is due by the original due date, even with an extension. To pay with the extension: electronically at govconnect.iowa.gov, or by check with the 1120V, Iowa Corporation Income Tax Payment Voucher (96-048).

S corporations

Return
Form IA 1120S, Iowa Income Tax Return for S Corporation (42-004)
Due date
The last day of the 4th month after the tax year ends (April 30 for a calendar year)
Extension
Iowa extends the return automatically, with no extension request and no federal extension needed. An S corporation that makes the PTET election or owes tax on built-in gains or passive investment income gets the six months only if at least 90% of that tax is paid by the original due date.
Extension length
6 months
Payment
The tax is due by the original due date, even with an extension. To pay with the extension: through e-file, GovConnectIowa, or by check with a voucher from GovConnectIowa.

Partnerships

Return
Form IA 1065, Partnership Return of Income (41-016)
Due date
The last day of the 4th month after the tax year ends (April 30 for a calendar year)
Extension
Iowa extends the return automatically, with no extension request and no federal extension needed. A partnership making the PTET election gets the six months only if at least 90% of the total tax is paid by the original due date.
Extension length
6 months
Payment
The tax is due by the original due date, even with an extension. To pay with the extension: through e-file, GovConnectIowa, or by check with a voucher from GovConnectIowa.

Estates and trusts

Return
Form IA 1041, Iowa Fiduciary Return (63-001)
Due date
The last day of the 4th month after the tax year ends (April 30 for a calendar year)
Extension
Iowa extends the return automatically, with no extension request and no federal extension needed. No late-filing penalty applies if at least 90% of the correct tax is paid by the original due date and the return is filed within six months of the due date.
Extension length
6 months
Payment
The tax is due by the original due date, even with an extension. To pay with the extension: Iowa Tax Payment Voucher (96-048), from GovConnectIowa.

When a due date in Iowa falls on a weekend or legal holiday, it moves to the next business day. Iowa's holidays can differ from the federal ones, so a rule not tied to a federal date is given without a computed date.

When is the federal business extension due?

Corporations, S corporations, partnerships, multi-member LLCs, estates and trusts extend their federal return with Form 7004, filed by the return's original due date. The extension is automatic: no reason is needed and the IRS doesn't approve it. We e-file it for a flat $9.95. These are the 2027 dates for calendar-year 2026 returns:

Federal extension deadlines for calendar-year 2026 returns
ReturnFile the extension byExtended to
Form 1065 Partnerships & multi-member LLCs, Form 70046 months
Form 1120-S S corporations (and LLCs taxed as S corps), Form 70046 months
Form 1120 C corporations (and LLCs taxed as C corps), Form 70046 months
Form 1041 Estates & trusts, Form 70045½ months
Form 990, 990-EZ, 990-PF Tax-exempt organizations & private foundations, Form 8868May 15, 2027 is a Saturday6 months

Federal dates follow the IRS rule: a deadline on a weekend or legal holiday moves to the next business day. A fiscal-year business counts from its own year-end; see the fiscal-year deadline guide.

Tax-exempt organizations extend the 990 series with Form 8868, not Form 7004. Each return needs its own extension, so extending a business return does not extend its owners' personal returns.

Does an extension give more time to pay?

No. A federal extension moves the filing deadline only: tax owed is due by the original due date, and the IRS charges interest and the late-payment penalty on anything paid after it. Iowa's instructions say the same for its returns: a Iowa extension doesn't move the payment deadline. More in does an extension give you more time to pay?

Where are Iowa's forms and instructions?

On the Iowa Department of Revenue website, which has the current forms, instructions and online services. The rules on this page are summarized from the sources below. We e-file the federal extension; the Iowa return and any Iowa extension request go to the state.

Iowa extension FAQ

Does Iowa accept the federal business tax extension?

Iowa extends the return automatically, with no extension request and no federal extension needed. The extension is 6 months. The extra six months apply only if at least 90% of the correct tax is paid by the original due date.

When is the Iowa Form IA 1120 due?

The last day of the 4th month after the tax year ends (April 30 for a calendar year).

Does a Iowa extension give more time to pay?

No. The tax is due by the original due date, even with an extension. To pay with the extension: electronically at govconnect.iowa.gov, or by check with the 1120V, Iowa Corporation Income Tax Payment Voucher (96-048).

Does a Iowa business still need a federal extension?

Yes, to get more time for its federal return: Form 7004, filed by April 15, 2027 for a calendar-year corporation or March 15, 2027 for a partnership or S corporation. Iowa's own extension is automatic.

Sources

Filing a federal business extension this season?

Filing for 2026 returns opens in January 2027, when the IRS begins accepting them. Leave your email and we'll send one message when it's live.

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