File a Business Tax Extension
A partnership or corporation that cannot close its books by the March or April due date can file Form 7004 for six more months.
Dimov Tax files the business tax extension and estimates the tax due by the original payment deadline.
Or call (866) 681-2140.
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Is it bad to file a tax extension?
No. The IRS grants Form 7004 and Form 4868 extensions automatically, at no charge. The request has to be complete, on time and based on a proper estimate of the tax.
The standard failure to pay penalty is 0.5% of the unpaid tax for each month or part of a month, up to 25%, plus interest. The IRS can reduce it for reasonable cause and other exceptions.
A C corporation or individual owner that skips the extension and files late also pays the failure to file penalty. The IRS adds 4.5% for each month or part of a month on top of the 0.5%, for up to five months.
Failure to pay penalty on a $20,000 balance
For a C corporation or individual owner with $20,000 due for 2026, filing October 15, 2027:
Extension, paid April 15. $0 in penalties and interest.
Extension, paid October 15. $600, from 0.5% for six months, plus interest.
No extension, filed and paid October 15. $5,100, from $4,500 for filing late and $600 for paying late, plus interest.
Illustrative: standard rates, one $20,000 balance, nothing paid before the date shown, no relief, estimated tax penalties excluded.
If a client pays more than the final tax, the IRS refunds or credits the difference after Dimov Tax files the return. Owners who cannot pay in full can still extend and set up an IRS payment plan.
Extension due dates by return type
For a calendar year 2026 return, the IRS sets these due dates in 2027.
| Return | Due | With extension |
|---|---|---|
| 1065 partnership | March 15, 2027 | September 15, 2027 |
| 1120-S S corporation | March 15, 2027 | September 15, 2027 |
| 1120 C corporation | April 15, 2027 | October 15, 2027 |
| 1040 individual | April 15, 2027 | October 15, 2027 |
The business files Form 7004 for the three business returns, and a multi member LLC files Form 1065 unless it elected corporate treatment. A single member LLC owned by an individual, with no corporate election, is a disregarded entity: the owner reports its income on the 1040. Its LLC tax extension is a Form 4868.
Each state sets its own extension rule, and Dimov Tax files a state request where the state requires one.
Why LLC and S corp owners extend their own returns
Each partner or S corporation shareholder needs a K-1, the form with that owner's share of business income, before filing a complete 1040. The business must hand each owner a K-1 by its return due date. A partnership on a Form 1065 extension can send K-1s as late as September 15, 2027.
The IRS does not extend the owner's 1040 with the business extension, so the 1040 is still due April 15. Owners who need more time must request a separate extension through Form 4868 or a designated extension payment, and get until October 15.
Dimov Tax files the business tax extension and any owner extensions together, from one estimate of the year's income.
Calendar year partnership or S corporation, owner waiting on a K-1
By March 15, 2027
Business files Form 7004
By April 15, 2027
Owner extends the 1040 and pays the 2026 balance
By September 15, 2027
Business files its return and sends each owner a K-1
By October 15, 2027
Owner files the 1040
When a business needs an extension
A business in one of these situations on the due date should file the extension:
Books not closed.
The profit and loss statement or balance sheet is not final.
Crypto not reconciled.
The client has not matched exchange and wallet trades for Form 8949, the capital gains form.
K-1s outstanding.
The business owns part of a partnership that has not sent its K-1.
Prior year fixes.
The CPA still has to apply a depreciation catch-up, cost segregation, wash sale fixes or a state income split.
With an extension, the CPA finishes the return after March and uses the extra time to plan the next year.
How a CPA files a business tax extension
Send the numbers.
Upload the profit and loss statement, balance sheet and last year's return.
Get the estimate.
A CPA or enrolled agent runs a trial return, a draft of the year's return. We then send the amounts to pay for the business and each owner.
Pay and file.
The client pays through IRS Direct Pay or EFTPS, the Treasury payment system, and Dimov Tax files the extension requests.
Finish the return.
Dimov Tax files the return before the extended date. If the books are open, the bookkeeping team closes them first.
Send the request at least two weeks before the due date, so the team can estimate from the books.
We do work 7 days a week during tax season.
Helped with last minute extension filings and requesting past IRS transcript. George and his team are absurdly fast and super responsive. Can't recommend them enough.
What a CPA charges to file an extension
Dimov Tax sets a fixed fee from four inputs:
Returns. One Form 7004, plus a Form 4868 for each individual return.
Books. Closed and final, or open and due for cleanup.
States. The number of state extension requests.
Income mix. Equity, crypto or rental income in the estimate.
A single Form 7004 with closed books and no state request is at the light end.
These are the factors, not a quote.
Request a Form 7004 extension from a CPA
Send the business name, entity type and expected 2026 income for a fixed quote and the upload list.
Or call (866) 681-2140. A CPA or enrolled agent takes the details in confidence.
Reviewed by George Dimov, CPA. Certified to practice in all 50 states. 15+ years advising on individual and business tax.