What this line means
The amount you sent to the IRS when you filed Form 4868 to request an automatic six-month extension. This is money you already paid — it counts as a credit against your total tax liability, the same as withholding or estimated payments. If you paid $2,000 with your extension request, that $2,000 reduces the amount you owe (or increases your refund) when you file the full return.
Does this apply to you?
- You filed Form 4868 for an automatic extension and included a payment with the request
- You made an electronic extension payment through IRS Direct Pay, EFTPS, or a debit/credit card
- You paid estimated tax as an extension payment through your tax software
Easy to overlook
Extension payments are easy to forget months later You made the extension payment in April. You file the return in August or October. 1 By then, many filers forget they sent money with the extension and do not enter it on this line. The result is an overstated balance due or a smaller refund than they are owed. Check your bank records or IRS account transcript for the April payment. General filing pattern — extension payment forgotten at filing time
An extension to file is not an extension to pay Form 4868 gives you six extra months to file your return, but the tax is still due by the original April deadline. 2 If you owed $5,000 and sent nothing with the extension, interest and the failure-to-pay penalty run from April 15 until you pay. The payment on this line is your best estimate of what you owed, made at extension time to stop penalties from accruing. IRS Form 4868 Instructions — Application for Extension
Watch out for this
Entering your estimated tax payments (Form 1040-ES) on this line instead of on Form 1040 line 26. Line 10 on Schedule 3 is exclusively for the payment made with your extension request (Form 4868). Quarterly estimated payments go on Form 1040 line 26. Putting estimated payments here and on line 26 double-counts them; putting them here instead of line 26 misclassifies them.
Footnotes
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IRS Form 4868 Instructions, Payment of Tax. https://www.irs.gov/instructions/i4868 ↩
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IRS Form 4868 Instructions, When to File. https://www.irs.gov/instructions/i4868 ↩