What this line means
Total estimated tax payments made for the tax year, including any overpayment from a prior year applied to estimated tax. This amount does not change on most amendments — you already made the payments. Column A and Column C are usually identical. The only exception is if you originally reported the wrong amount of estimated payments.
Does this apply to you?
- You made quarterly estimated tax payments during the year being amended
- You applied a prior-year overpayment to the current year’s estimated tax
- You reported the wrong estimated payment amount on your original return
- You made an additional payment after filing the original return
Easy to overlook
Payments made after the original filing still count If you made an estimated tax payment or any additional payment to the IRS after filing your original return but before filing the amendment, that payment applies to the tax year. Include it on line 12. The IRS credits payments by tax year, not by filing date. 1 IRS Form 1040-X Instructions — Line 12
Prior-year overpayment applied to estimated tax If you elected to apply your prior year’s overpayment to the current year’s estimated tax (line 36 of Form 1040 or line 21 of a prior 1040-X), that amount is included here. Filers sometimes forget this credit when tallying estimated payments. 2 General filing pattern — overpayment applied from prior year
Watch out for this
Changing estimated payment amounts without supporting records. The IRS tracks every payment you make through EFTPS, Direct Pay, and check processing. If you claim estimated payments that the IRS did not receive, the credit is denied. Use your payment receipts or IRS account transcript to verify the exact amounts.
Footnotes
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IRS Form 1040-X Instructions, Line 12. https://www.irs.gov/instructions/i1040x ↩
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IRS Form 1040-X Instructions, Estimated Tax Payments. https://www.irs.gov/instructions/i1040x ↩