Tax extension guides
Plain-English explanations of IRS extension deadlines, penalties, and how the forms work — so you can file with confidence.
Guides marked "Reviewed for accuracy" have been checked by Lauren Twitchell, EA, a former IRS Revenue Agent.
All guides
Tax extension deadlines
When to file Form 7004, 4868, and 8868 by entity type — and what dates the extension moves you to.
2027 business tax deadline calendar
Every federal business due date by month: returns and extensions, estimated tax, W-2s and 1099s, payroll and excise returns. Printable, with an .ics download.
Failure-to-file vs. failure-to-pay penalties
How IRS late penalties work, the difference between them, and how an extension helps you avoid the bigger one.
IRS penalty calculator
Estimate late-filing and late-payment penalties and interest from your own dates, with and without an extension.
Which extension form do I need?
Answer two questions to get your form (7004, 8868 or 4868), the return it extends, and your deadlines, fiscal years included.
Business tax extension checklist
What to gather, how to file Form 7004 on time, how to pay, what to keep, and the mistakes that get extensions rejected.
Is a business tax extension automatic?
Yes, once Form 7004 is filed on time. The four conditions the IRS sets, how long the extension lasts, and what it does not extend.
Business tax extensions by state
Whether your state honors the federal Form 7004 extension, extends automatically or needs its own form, with due dates and the state agency’s own sources.
Tax extension statistics
How many extensions the IRS receives each year, by form, and what late filing costs — compiled from IRS Data Book tables.
LLC tax extension
Which form your LLC uses based on how it's taxed — Form 7004 for most, Form 4868 for single-member LLCs.
S-corp tax extension
S corporations file Form 7004 to extend Form 1120-S — who files, the deadline, and how to e-file.
Partnership tax extension
Partnerships and multi-member LLCs file Form 7004 to extend Form 1065 by six months.
Nonprofit tax extension
Tax-exempt organizations file Form 8868 to extend a 990-series return — not Form 7004.
C-corp tax extension
C corporations file Form 7004 to extend Form 1120 by six months — and still owe the tax by the original date.
Estate & trust extension (Form 1041)
Fiduciaries file Form 7004 to extend Form 1041 — for 5½ months, not six. Who signs, which EIN, and what it covers.
Does an extension give you more time to pay?
No — only more time to file. What is still due, how to estimate it, how to pay, and what happens if you can't.
How much does a tax extension cost?
Free options first, then what paid services charge for Forms 4868, 7004 and 8868 and what you get for the fee.
Missed the extension deadline?
What to do now, what it costs per month, and the cases where your deadline was later than you think.
Can you file Form 7004 after the deadline?
What counts as on time, the few exceptions, and what a partnership, S corporation or C corporation owes when it misses the date.
Fiscal-year extension deadlines
The 15th-day-of-the-Nth-month rule, worked examples for common year-ends, and short tax years.
Form 7004 instructions, in plain English
What each part of Form 7004 asks for — form codes, tax year, tentative tax — and the common rejection reasons.
Form 7004 rejected? Reasons and fixes
Each IRS reject code for Form 7004 in plain English, how to fix it, and the five-day window to resend it on time.
E-filing vs. paper filing Form 7004
Same extension either way. How each counts as on time, the proof you get, which returns must go on paper, and how to pay.
Form 4868 instructions, in plain English
How to fill out Form 4868: identification, the tax estimate, paying with the extension, and joint filers.
Form 8868 instructions, in plain English
Which return code to use, what the 8868 asks for, and why the 990-T needs its own extension.
Learn about each form
Who files it, the deadline, and how to e-file.
Business Tax Extension
S corporations, C corporations, partnerships, multi-member LLCs, estates, trusts, and other eligible business returns
Nonprofit Tax Extension
Eligible exempt-organization and related returns, including Forms 990, 990-EZ, 990-PF, 990-T, and certain other returns
Personal Tax Extension
Individuals & sole proprietors filing Form 1040
Compare your options
See how we stack up on price and ease.
Cheapest way to file
An honest 2026 roundup of what an extension actually costs — free options included.
vs. ExpressExtension
Price and feature comparison against the category volume leader.
vs. TaxBandits
A flat extension fee vs. a full compliance platform, retail and volume tiers side by side.
vs. TaxExtension.com
One flat fee vs. the premium brand's tiered pricing.
vs. Tax2efile
Lower flat pricing vs. a broad multi-form IRS e-file shop.
vs. TaxZerone
A lower standalone price with no return-bundling required.
vs. EZExtension
We beat the flat-$9.99 leader on price — and we file nonprofit 8868.
vs. FileLater
Transparent flat pricing vs. a fee shown only at e-file time.