How to File a Tax Extension (Step-by-Step Guide)

If you need more time to gather documents, finalize your bookkeeping, or track down K-1s, filing a tax extension is a smart, strategic move. The process is straightforward, but it differs depending on whether you are filing as an individual or a business.

Here is your step-by-step guide on how to file a tax extension.

Part 1: How to File an Extension for Individuals (Form 4868)

If you file a standard Form 1040 (including freelancers, gig workers, and sole proprietors), you will use Form 4868.

1. Estimate your total tax liability: An extension gives you time to file, but not time to pay. Look at your previous year's return and your current year's income to estimate what you will owe.
2. Calculate your payments: Add up the taxes you have already paid this year through W-2 withholdings and any quarterly estimated tax payments.
3. Determine the balance: Subtract your payments from your estimated liability. If the number is positive, this is the estimated tax you owe.
4. File Form 4868: You can file this form electronically through tax software, via a tax professional, or by mailing a paper form to the IRS.
5. Make a payment (Safe Harbor): To avoid late-payment penalties, pay the estimated balance you calculated in Step 3 when you submit Form 4868. As long as you pay at least 90% of your actual tax liability, you will avoid the failure-to-pay penalty (though minor interest may still apply to the remaining 10%).

Part 2: How to File an Extension for Businesses (Form 7004)

Partnerships, S-Corporations, and C-Corporations must use Form 7004 to request an automatic extension.

1. Identify your tax form code: Form 7004 asks for a specific code representing the return you are extending. For example, a Partnership (Form 1065) uses Code 09, while an S-Corp (Form 1120-S) uses Code 25.
2. Estimate corporate taxes (if applicable): If you are a C-Corporation, you must estimate your corporate tax liability and pay it by the April 15 deadline. Partnerships and S-Corps generally do not pay federal income tax, so there is usually no payment required with their extension.
3. File electronically or by mail: Form 7004 can be e-filed. Remember that for Partnerships and S-Corps, this must be done by March 15.

Don't Forget About State Extensions

Filing a federal extension does not always cover your state taxes. Some states, like California and New York, grant automatic state extensions if you file a federal one. Others require you to submit a separate state-level extension form. Always check your state's Department of Revenue rules.