How to File a Tax Extension in 2026: Form 4868 Explained

How to File a Tax Extension in 2026: Form 4868 Explained

An extension to file is not an extension to pay, and that single misunderstanding costs store owners thousands of dollars every April. Here is exactly how Form 4868 works: the four ways to file one, the current IRS penalty and interest figures with a worked example, the 90 percent rule that keeps the late payment penalty off your back, state extensions, and what changes if you run a multi member LLC or an S corp.

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