This guide is for anyone with U.S. filing obligations, including Australia-based U.S. citizens, resident aliens, investors, freelancers and business owners. One point matters up front: Australian tax paid to the ATO does not go on line 26 automatically. We cover what belongs there, how it differs from withholding and Schedule 1 line 26, how to verify your total, and how to fix IRS mismatches.
Key Takeaways
- Line 26 reports estimated federal payments and prior-year overpayments applied to the current year.
- Withholding from employers, brokers and pension payers belongs on line 25, not line 26.
- ATO payments are not U.S. estimates; eligible Australian tax may support Form 1116 instead.
- Check your payment log against your IRS Online Account and account transcript before filing.
- Confirm whether Form 1040 or Form 1040-NR applies to you.
What Does Form 1040 Line 26 Mean?
The role of estimated payments on Form 1040
Line 26 reports federal tax you paid directly to the IRS during the year, on income with no tax withheld. The IRS describes estimated tax as covering income such as self-employment earnings, interest, dividends and rent.
Line 26 feeds into total payments. For 2025, line 33 equals line 25d plus line 26 plus line 32. If line 33 exceeds your total tax, you have an overpayment. If tax exceeds payments, you owe a balance.
Typical line 26 users:
- Freelancers and the self-employed
- Investors with large dividends or gains
- Landlords
- Retirees without enough withholding
- People with irregular income
Not every taxpayer files Form 1040. Nonresident aliens with U.S. trade or business activity, or with U.S. income not fully taxed through withholding, generally use Form 1040-NR. Living in Australia does not by itself make you a nonresident alien for U.S. purposes. VJM Global prepares both Form 1040 and Form 1040-NR returns for individuals.
Distinguishing Form 1040 line 26 from Schedule 1 line 26
The two lines share a number and nothing else. Schedule 1 line 26 totals adjustments to income (lines 11 to 23 and 25) and carries to Form 1040 line 10. Form 1040 line 26 is a payment. One reduces income; the other credits tax already paid.
Line numbers shift between years, so check the current-year Form 1040 and Schedule 1 instructions.
Line 25 withholding versus line 26 estimated payments
The source of the payment decides its placement.
- Line 25 (withholding): W-2 wages, pension or retirement distributions, and 1099 payers that remit tax on your behalf.
- Line 26 (estimates): Form 1040-ES vouchers, Direct Pay, Online Account or card payments you send yourself.
Withholding is already totalled on line 25d, so reporting it again on line 26 double counts it.
Which Payments Belong on Form 1040 Line 26?
Payments generally included in the line 26 total
Include:
- Federal estimates paid for 2025, through Form 1040-ES, Online Account, Direct Pay, card or other accepted methods
- A 2024 overpayment you elected to apply to 2025
Exclude:
- Estimates designated for 2026
- Federal withholding
- State tax payments
- Refundable credits
- Foreign tax payments
These all reduce what you owe, but each sits on a different line.
For Australia-based filers, ATO payments are not U.S. estimated payments. Eligible Australian income tax may instead support the separate Form 1116 foreign tax credit. Report U.S. return amounts in U.S. dollars.
How to calculate the reported amount
Add all estimates credited to the tax year, plus any prior-year overpayment applied forward. Leave out withholding and unrelated payments.
Illustrative example (fictional figures):
| Item | Amount |
|---|---|
| 15 April payment | $2,000 |
| 16 June payment | $2,000 |
| 15 September payment | $2,000 |
| 15 January payment (for the same tax year) | $2,000 |
| 2024 overpayment applied forward | $1,500 |
| Line 26 total | $9,500 |
The January payment is the one people trip over. The 15 January 2026 instalment belongs to 2025, and its voucher reads "2025 Form 1040-ES." The designated tax year matters more than the calendar date.
Estimating how much to pay during the year
For 2025, estimates are generally required if you expect to owe at least $1,000 after withholding and refundable credits. You avoid the penalty by paying the smaller of:
- 90% of your 2025 tax, or
- 100% of your 2024 tax (110% if 2024 AGI exceeded $150,000, or $75,000 if married filing separately)
The prior-year return must cover 12 months. Meeting a safe harbour limits penalty exposure, but you may still owe more at filing.
If income is uneven, the annualized income installment method can lower individual required instalments. It uses Schedule AI with Form 2210; using it for one due date means using it for all.
When to Pay, Document, and Verify Estimated Tax Payments
Quarterly payment timing
For 2025, the due dates were:
- 15 April 2025
- 16 June 2025
- 15 September 2025
- 15 January 2026 (for 2025)
Weekend and legal holiday dates move to the next business day. Fiscal-year individuals pay on the 15th day of the fourth, sixth and ninth months, and the first month after year-end.
You can pay more often than four times, but later catch-up payments do not erase earlier underpayments.
Disaster relief can shift dates. Qualifying Los Angeles County taxpayers, for example, had their April, June and September 2025 estimates postponed to 15 October 2025.
Australia-based filers get an automatic two-month extension to file, but interest runs from the regular due date and estimated instalment obligations remain.
Payment methods and confirmation records
Online payment rules to note:
- Choose "1040-ES (estimated tax)" and the correct tax year in Direct Pay
- Direct Pay cannot draw on foreign banks without a U.S. affiliate
- Individuals cannot create new EFTPS accounts and cannot make EFTPS payments from 12 November 2026
For cheques, pay "United States Treasury," write your SSN and "2025 Form 1040-ES," and include the voucher.
Keep these records:
- Confirmation numbers (Direct Pay cannot retrieve them later)
- Bank statements and cancelled cheques
- Vouchers and filed returns
Retention is generally three years, and longer in some cases.
Checking IRS records before filing
Your IRS Online Account shows up to five years of payment history, including pending payments. The account transcript shows payment types and post-filing changes. Compare both with your own log before you file.
Keep U.S. federal payment records separate from ATO records so a payment never lands in the wrong system.
Common Line 26 Errors and IRS Payment Mismatches
Missing or duplicated prior-year overpayments
After switching software or preparers, you may omit an elected overpayment, count it twice, or report it in the wrong year. Reconcile the new return against the prior-year filed return and your account transcript before submitting.
Misclassifying withholding as estimated payments
W-2, 1099, pension and retirement-account withholding sometimes gets entered on line 26. The total may look right, yet the IRS still flags a mismatch because it posts each figure to its own category.
Payments credited to the wrong year or taxpayer account
Common causes:
- A January payment designated for the current year instead of the prior one
- A payment made under the wrong spouse's SSN
The IRS tracer process checks tax periods, payment type and TIN, and secondary-spouse payments may need a transfer to the primary joint account. Cancelled cheques, confirmations, bank records and transcripts support a correction.
How to respond to an IRS notice
CP23 and CP24 notices flag differences between estimated payments claimed and those posted. To respond:
- Read the notice and note its response date.
- Pull your account transcript.
- List each payment by date and tax year.
- Compare the list with bank records.
- Identify the missing or misapplied amount.
- Call the notice number with your return and payment evidence ready.
You may need a payment transfer or supporting documents. Note that First Time Abate does not cover estimated-tax penalties.
When records are complex, VJM Global's U.S.-compliant tax professionals can assist Australia-based clients with estimated-payment reconciliation and IRS notice support.
How Line 26 Affects Refunds, Balances Due, and Penalties
From total payments to refund or balance due
Line 26 joins withholding and other credits in line 33. Say your total tax is $12,000 and withholding is $3,000. With a correct line 26 of $9,500, payments are $12,500 and you have a $500 overpayment.
Omit the line 26 amount and you appear to owe $9,000. Your liability never changed; only the accuracy did.
Applying an overpayment to the following tax year
On the 2025 Form 1040, line 34 is the overpayment, line 35a selects a refund, and line 36 applies an amount to next year's estimated tax. That election cannot later be changed. The applied amount then appears on next year's line 26.
Underpayment penalties
A refund does not guarantee a penalty-free year. Form 2210 tests each instalment separately, so paying the full liability late can leave earlier shortfalls. The penalty reflects the amount underpaid, how long it went unpaid, and the quarterly rate.
Recent IRS interest rates were 6% for April to June 2026 and 7% for the following two quarters.
The annualized income method on Schedule AI may reduce exposure when income is uneven. If you have foreign residency, multiple income streams, business income or mismatches, consult current IRS instructions or a qualified tax professional.
Frequently Asked Questions
What does "adjustments to income from Schedule 1, line 26" mean on Form 1040?
Schedule 1 line 26 totals adjustments to income and carries to Form 1040 line 10. Form 1040 line 26 is a payment. Check the instructions for your tax year.
What are estimated tax payments on Form 1040 line 26?
It is where you report estimated federal tax payments for the year plus any prior-year overpayment applied to it.
What payments go on Form 1040 line 26?
Include Form 1040-ES and other direct estimated payments designated for the tax year. Do not include withholding, state payments or foreign tax payments.
Are estimated tax payments the same as tax withholding?
No. You send estimates directly to the IRS. An employer, broker or pension provider withholds and remits tax on your behalf.
Does a prior-year tax overpayment belong on Form 1040 line 26?
Yes, if you elected to apply it to the following year. It is included with that year's estimates, subject to the current instructions.
What should I do if my IRS records do not match line 26?
Compare your account transcript with payment confirmations, bank records and the prior-year return. Do this before responding to a notice or requesting a correction.
