Updated November 7, 2026. Quick answer: For every estimated tax payment keep the date paid, the amount, how you paid and the confirmation or check number, because the total goes on Form 1040 line 26 and the IRS matches it to your account. Form 1040-ES has its own Record of Estimated Tax Payments marked Keep for Your Records, and an IRS online account shows five years of payment history to check your log against before you file.
The record the IRS gives you
This page reads the 2026 Form 1040-ES package and the Instructions for Form 1040 for the 2025 return, as retrieved on November 6 and 7, 2026. The 1040-ES carries a worksheet headed Record of Estimated Tax Payments, with the instruction “Keep for Your Records”. Its columns include “Check or money order number, or credit or debit card confirmation number” and “Amount paid (do not include any convenience fee)”. The second column matters: a card fee is not part of the payment you claim.
| Column | What to write | Where it comes from |
|---|---|---|
| Payment number and due date | Which of the four installments this is | Printed on the 1040-ES worksheet |
| Date paid | The day you paid, not the due date | Bank or card record |
| How paid | Online account, Direct Pay, card, EFTPS, check | Your own note |
| Confirmation or check number | What the payment method gave you | Confirmation screen, email, check register |
| Amount paid | The tax payment, without any convenience fee | Statement line |
| Prior-year overpayment applied | Credit carried from last year’s return, if any | Last year’s return |
How each way of paying leaves a trail
The 1040-ES lists the options. Through the IRS online account you can “Make a payment or view 5 years of payment history and any pending or scheduled payments.” IRS Direct Pay is described as “For online transfers directly from your checking or savings account at no cost to you”. Card payments carry a cost: “A fee is charged by these service providers.” A mailed payment uses a voucher, and the package says “Complete and send in the voucher only if you are making a payment by check or money order.” For spouses filing separately: “If you and your spouse plan to file separate returns, file separate vouchers instead of a joint voucher.” Whatever the method, save the confirmation at the moment you pay; the check register or bank line is the fallback.
Where the total lands: Form 1040 line 26
The 2025 instructions for line 26 say “Enter any estimated federal income tax payments you made for 2025. Include any overpayment that you applied to your 2025 estimated tax from your 2024 return or an amended return.” Your log’s total, plus any applied overpayment, is that number. The line walk-through is on Form 1040 line 26 and the form itself on Form 1040-ES.
Joint payments and name changes
Two situations need more than a number. If you paid jointly and now file separately, “If you and your spouse paid joint estimated tax but are now filing separate income tax returns, you can divide the amount paid in any way you choose as long as you both agree.” If a name changed, “If you changed your name and you made estimated tax payments using your former name, attach a statement to the front of Form 1040 or 1040-SR that explains all the payments you and your spouse made in 2025 and the name(s) and SSN(s) under which you made them.” Both are easier with a log that shows whose name and number each payment used.
Check the log against the IRS record before you file
Publication 505 notes that through the online account “You can also see your payment history and other tax records there.” This page’s suggestion: before filing, compare your log’s payment dates and amounts with that history and with your bank or card statement. A payment sent to the wrong year, or one that posted late, shows up as a difference you can fix before the return is filed rather than after a notice.
Common mistakes
- Including a card convenience fee in the amount of the payment.
- Losing the confirmation number for an online payment because the screen was closed.
- Entering the due date as the payment date, which hides a late or early payment.
- Leaving the prior-year overpayment credit out of the total on line 26.
Related: Form 1040 line 26, quarterly estimated taxes for the self-employed, and Receipts and Expense Records for a One-Person Business.
Sources
- IRS 2026 Form 1040-ES, Estimated Tax for Individuals
- IRS Instructions for Form 1040 and Form 1040-SR (2025)
- IRS Publication 505 (2026), Tax Withholding and Estimated Tax
- IRS, How long should I keep records
Read from the IRS documents linked above on November 7, 2026. General information, not tax advice. Your own facts decide the outcome, and a preparer, the account provider or the IRS is the right place to confirm anything consequential.