Introduction
If you earn U.S. income while based in Australia, estimated tax is easy to miss until IRS underpayment penalties show up. Form 1040-ES helps you work out what you owe. You do not have to mail it: pay through an official IRS online channel and the form's instructions say no voucher is needed.
This guide is for Australia-based individuals and business owners with U.S. federal obligations. U.S. estimated tax is separate from your Australian income tax and PAYG instalments.
The ATO describes PAYG instalments as prepayments of expected Australian tax, and they do not count toward your U.S. payments. Here you will find who needs to pay, how to calculate the amount, which online routes work from Australia, and how to keep proof.
Key Takeaways
- Confirm you need to pay, calculate the amount, and fix the tax year and quarter first.
- Direct Pay, an IRS Online Account, EFTPS and card processors differ in fees and eligibility.
- Without a U.S. bank account, use a card processor or an international wire.
- Start at IRS.gov, save your confirmation number, and keep payment records.
- Check current dates, fees and rules for your tax year before paying.
What Form 1040-ES Is and Who May Need to Pay
Form 1040-ES is used to figure and pay estimated tax for the current year. Form 1040 is different: it reports the completed year and is where you claim your estimated payments.
Income that creates the obligation
Estimated tax usually applies to income without withholding, such as:
- Self-employment or freelance earnings
- Interest and dividends
- Rental income
- Capital gains
- Prizes and awards
The 2026 payment test
According to the 2026 Form 1040-ES, you generally must pay if both of these apply:
- You expect to owe at least $1,000 after withholding and refundable credits.
- Your withholding and credits fall below the smaller of 90% of 2026 tax or 100% of 2025 tax.
Use 110% of 2025 tax if your 2025 AGI exceeded $150,000 ($75,000 if married filing separately). If you had no tax liability for all of 2025, no payments are required.
Living in Australia
U.S. citizens and resident aliens in Australia face the same estimated-tax rules as filers in the United States, based on worldwide income. Citizenship, U.S. residency status, U.S.-source income, a U.S. business or U.S. investments can each create a filing connection.
The worksheet in Form 1040-ES supports your calculation. The voucher is only for paying by cheque or money order.
How to Calculate the Amount to Pay Before Going Online
Gather these before you start:
- Last year's US federal return
- Current income and any withholding
- Expected deductions and credits
- Self-employment, investment and rental details
- Payments already made this year
Choosing an estimation method
If your income is steady, last year's tax is a simple planning reference. If earnings are lumpy, the annualised income installment method (Schedule AI to Form 2210) may reduce or remove an installment payment. If you use it for one due date, you must use it for all of them.
Overseas taxpayers can exclude income exempt from U.S. tax from their estimates and may include an estimated housing deduction, per IRS Publication 54.
Updating during the year
Income changes, so estimates should too. Complete a new worksheet when income, deductions, credits or withholding shift, then spread the revised remaining liability across the installments still ahead.
Before opening the payment page
Confirm four things:
- Tax year
- Payment period
- Taxpayer identification details
- Amount
Choosing the wrong tax type or period can misallocate your payment and take time to correct.
Compare the Fastest and Most Secure Ways to Pay IRS Estimated Tax Online
| Method | Sign-in | Fees | Scheduling | Best fit from Australia |
|---|---|---|---|---|
| IRS Direct Pay | None | No IRS fee | Up to 365 days ahead | You hold a U.S. bank account |
| IRS Online Account | ID.me verification | No IRS fee for bank payments | Same day or up to 365 days ahead | You want payment history and records |
| EFTPS | Existing users only | No fee | Up to 365 days ahead | Existing enrolled users |
| Card or wallet processor | None | Processor fees apply | At payment | No U.S. bank account |
| International wire | Bank-dependent | Bank and conversion fees | Same day, subject to cutoffs | Larger payments from a foreign account |
Direct Pay
IRS Direct Pay is free and needs no account. You can schedule up to 365 days ahead and change or cancel no later than two business days before the payment date. It needs a U.S. bank routing number (ABA), not a SWIFT code. It also verifies you against a prior federal return, so first-time filers cannot use it.
IRS Online Account
You verify your identity through ID.me, then pay from a bank account the same day or on a schedule. You can also see pending payments and up to five years of payment history. Setup takes time, so create the account well before a deadline.
EFTPS
The IRS says individuals cannot create new EFTPS accounts, though existing users can keep using it for now. Existing users get immediate acknowledgement and 15 months of history. Schedule by 8 p.m. ET the day before the due date.
Card, wallet and the IRS app
IRS-listed processors charge fees. Published rates include:
- Pay1040: $2.15 on personal debit; 1.75% on credit (minimum $2.50)
- ACI Payments: $2.10 debit; 1.85% on credit (minimum $2.50)
Your Australian bank may add currency conversion costs.
The IRS app replaced IRS2Go and links to payment services. Treat it as a gateway to official IRS payments, not a separate tax account.
Paying without a U.S. bank account
Publication 6147-C lists U.S.-dollar international wires as an option. For Form 1040-ES, use tax type code 10406 and complete the Same-Day Taxpayer Payment Worksheet for your bank. Your bank needs a U.S. banking relationship, and fees and cutoffs vary.
How to Pay Form 1040-ES Online With IRS Direct Pay
- Go straight to the official page. Open IRS Direct Pay from IRS.gov. Never use payment links from unsolicited emails, texts or social media.
- Choose the payment details. Select Reason for Payment as Estimated Tax and Apply Payment To as 1040-ES (the first screen may show Form 1040 - Income Tax). In January you can pick the current or previous year; from February to December, only the current year is available.
- Verify your identity. Enter your name, address and SSN exactly as on the prior-year return you select. The IRS may use data from 5 to 6 years back.
- Enter payment details. Add the amount, U.S. account type, routing and account numbers, date and optional email. Check every digit and confirm the account can support the debit.
- Review and save. Record the confirmation number. Use Look Up a Payment to review, change or cancel before the deadline.
Troubleshooting
- Identity check fails: match the return exactly, or try a different year's return. Never-filers cannot use Direct Pay.
- Wrong classification: contact the IRS promptly, with your confirmation number.
- No U.S. bank details: switch to a card processor or wire.
- Failed debit or duplicate submission: check Look Up a Payment before paying again.
A tax professional can help if the payment is large or the allocation is unclear.
Pay Securely, Confirm the Debit, and Keep Proof of Payment
Security checklist
- Start at IRS.gov and check the address and secure connection.
- Avoid public or shared devices and untrusted networks.
- Never share your taxpayer ID or banking credentials by email or text.
- Store receipts in a protected location.
The IRS does not email or text without permission. Report suspicious messages to [email protected].
Request, confirmation, debit and posting
Request, confirmation, debit and posting are four separate events. Direct Pay credits the selected payment date if the withdrawal succeeds, but processing can take up to 2 business days.
Check your bank after that window. Card payments typically appear in your IRS Online Account one to two days after the payment date.
Records to keep
- Confirmation number and email receipt
- Scheduled payment details
- Bank statement entry
- Payment date, amount, tax year and quarter
- Any IRS correspondence
You will need these to reconcile payments with your annual return. For Australia-based business owners with U.S. tax obligations, VJM Global provides tax compliance and accounting support to review estimates and keep organised payment records. It does not replace IRS confirmation or authorise payments on your behalf.
Deadlines, Penalties, and a Final Online-Payment Checklist
2026 schedule
- April 15, 2026
- June 15, 2026
- September 15, 2026
- January 15, 2027
The January installment is unnecessary if you file your 2026 return by February 1, 2027 and pay the full balance with it. A due date on a weekend or legal holiday moves to the next business day. Disaster relief may extend dates for covered areas, so check the specific notice.
The automatic two-month extension for taxpayers abroad moves the annual return date to June 15. Confirm against current IRS guidance whether estimated installment dates also move.
Penalties
Underpaying or paying late can trigger a penalty even if you settle the balance with your return. It is figured per installment, so a later catch-up does not necessarily erase an earlier shortfall.
Safe-harbour payments protect you, and Form 2210 applies in some cases. The IRS underpayment interest rate is 7% per year, compounded daily, for October to December 2026. Complex cases deserve professional advice.
Final checklist
- Calculate your liability.
- Confirm you must pay.
- Select the correct tax year and quarter.
- Choose a payment method.
- Verify identity and bank details.
- Review fees and processing time.
- Submit through IRS.gov.
- Save proof.
- Reconcile on your final Form 1040.
This article is general information, not tax advice. Rules, thresholds, fees and payment screens can change. If you have cross-border income, get advice based on both your U.S. and Australian circumstances.
Frequently Asked Questions
What is the best way to pay IRS estimated taxes?
Direct Pay is free for those with a U.S. bank account. Without one, use a card processor (fees apply) or an international wire. Online Account suits those wanting payment records.
What is the IRS schedule for estimated tax payments?
Four payments a year. For 2026: April 15, June 15, September 15 and January 15, 2027. Weekend or holiday dates move to the next business day.
How long does it take the IRS to process a direct debit payment?
Direct Pay credits your selected date if the withdrawal succeeds, but processing can take up to two business days. Check your bank after that and see current IRS guidance.
What is the 90% rule for estimated tax payments?
You avoid a penalty if withholding and payments cover at least 90% of current-year tax, or 100% of prior-year tax (110% at higher income). The $1,000 test also applies.
How do I look up or get proof of payments made to the IRS?
Use your confirmation number with Look Up a Payment, your email receipt, bank statement, Online Account payment activity or an account transcript. Keep them all.
Where do estimated tax payments go on 1040?
On the 2025 Form 1040, estimated payments, including any 2024 overpayment applied, go on line 26. Check the current form's instructions for your year.
