April 15 Checklist: Everything NRAs Need Before the Filing Deadline

April 15 Is Two Weeks Away. Here’s Every NRA Filing Task You Should Have Done by Now

If you’re a nonresident alien with US income, April 15, 2026 is your deadline for filing the 2025 tax year return. That’s Form 1040-NR, estimated tax payments, and a handful of other obligations that catch people off guard every year.

This isn’t a detailed breakdown of any single form. It’s the checklist you tape to your monitor for the next 14 days. Every item that needs to happen before April 15, what to do if you’re not ready, and the penalties for getting it wrong.

The Checklist: What’s Due April 15, 2026

1. File Form 1040-NR (or Request an Extension)

If you earned US-source income in 2025 and you’re classified as a nonresident alien, you file Form 1040-NR. This covers rental income from US property, wages from US employment, and certain other income types connected to a US trade or business.

Common income sources for NRA investors in Florida:

Net rental income from vacation rental properties
Capital gains from property sales (subject to FIRPTA withholding)
Income from a US partnership (Schedule K-1)
Dividends or interest from US sources (though often covered by withholding)

Not ready to file? You can request a 6-month extension using Form 4868. This gives you until October 15, 2026 to file. But here’s the catch: the extension is for filing, not for paying. If you owe tax, you still need to estimate and pay by April 15 or you’ll face interest and penalties on the unpaid amount.

A common misconception: some NRAs think they get an automatic 2-month extension (to June 15) because they live outside the US. That’s true for US citizens abroad, not for nonresident aliens. Your deadline is April 15. Period.

2. Pay Any Remaining Tax Balance

If your withholding and estimated payments didn’t cover your full 2025 liability, the balance is due April 15. You can pay via:

IRS Direct Pay (irs.gov/directpay) if you have a US bank account
EFTPS (Electronic Federal Tax Payment System) if you’re enrolled
Check or money order mailed with Form 1040-V
Credit/debit card through IRS-approved processors (they charge a fee)

Don’t have a US bank account? This is where many foreign investors get stuck. If your accountant can make the payment on your behalf through EFTPS, that’s the easiest path. Otherwise, the credit card option works but costs 1.85-1.98% of the payment amount.

3. First Quarter 2026 Estimated Tax Payment

If you expect to owe $1,000 or more in tax for 2026, you should be making quarterly estimated payments. The Q1 payment for 2026 is also due April 15.

The four quarterly deadlines for tax year 2026:

Q1: April 15, 2026
Q2: June 15, 2026
Q3: September 15, 2026
Q4: January 15, 2027

NRAs with rental income use Form 1040-ES (NR) to calculate and pay estimated taxes. If your rental income is fairly consistent year to year, the safe harbor method works: pay at least 100% of last year’s tax liability spread across four payments, and you avoid underpayment penalties regardless of what happens in 2026.

First year with US income? You won’t have a prior year to base estimates on. Use your projected 2026 income and the tax rates on Form 1040-ES (NR) to estimate. Getting close is better than paying nothing.

4. Check Your ITIN Status

No Social Security Number? You need an Individual Taxpayer Identification Number (ITIN) to file. ITINs expire if they haven’t been used on a federal return in the past three consecutive years. They also expire on a rolling basis if they were issued before 2013.

If your ITIN has expired, you need to renew it with Form W-7 before you can file. You can submit the W-7 with your tax return, but this adds processing time. The IRS currently takes 7-11 weeks to process ITIN renewals.

If you’re cutting it close on April 15 and your ITIN is expired:

File Form 4868 for the extension (you can file this without an ITIN by writing “ITIN Applied For” where the number goes)
Submit Form W-7 with your return when it’s ready
Pay estimated tax due by April 15 to avoid penalties

5. Partnership and S-Corp Returns (K-1s)

If you own rental property through a US LLC taxed as a partnership, the partnership return (Form 1065) was due March 15, 2026. If your accountant filed it on time, you should have your Schedule K-1 by now. That K-1 feeds into your personal 1040-NR.

If the partnership filed an extension, the K-1 might not arrive until September. In that case, you’ll almost certainly need to extend your personal return too. But you still need to estimate and pay any tax owed by April 15.

Don’t have your K-1 yet? Call your accountant. Now. Not next week.

6. FIRPTA Refund Claims

If you sold US real property in 2025 and the buyer withheld 15% under FIRPTA (Foreign Investment in Real Property Tax Act), your actual tax liability on the gain might be lower than 15% of the gross sale price. The only way to get the excess back is to file your 1040-NR.

This is one situation where filing early matters. FIRPTA refunds can take months to process. If you’re waiting for a refund, don’t sit on the return until October.

7. Treaty Benefits and Form 8833

If you’re claiming reduced rates or exemptions under a US tax treaty, you need to attach Form 8833 (Treaty-Based Return Position Disclosure) to your 1040-NR. Brazil, for example, has a tax treaty with the US that affects certain income categories.

Missing Form 8833 doesn’t disqualify the treaty benefit, but the IRS can impose a $1,000 penalty for failure to disclose. It’s a form that takes 15 minutes to fill out. Don’t skip it.

8. FBAR (FinCEN 114) — Different Deadline, Same Season

This isn’t due April 15. The FBAR deadline is April 15 with an automatic extension to October 15. But it’s worth mentioning because it trips up NRAs who also qualify as US tax residents for part of the year, or who have US financial accounts while being non-residents in other jurisdictions.

The FBAR requires you to report foreign financial accounts if the combined value exceeded $10,000 at any point during the year. It’s filed electronically through FinCEN’s BSA E-Filing system, not with the IRS. The penalties for not filing are steep: up to $10,000 per account per year for non-willful violations, and much worse for willful ones.

If you’re purely a nonresident alien with no US financial accounts, this probably doesn’t apply to you. But if you moved to the US partway through the year or have dual status, check with your accountant.

What Happens If You Miss April 15

Failure to File Penalty

5% of unpaid tax per month, up to 25%. This starts the day after the deadline. Filing even one day late with a balance due triggers it. If you’re more than 60 days late, the minimum penalty is $510 or 100% of unpaid tax, whichever is less.

Failure to Pay Penalty

0.5% of unpaid tax per month, up to 25%. Runs alongside the filing penalty. If you filed an extension and paid your estimate, this only kicks in on the difference between what you paid and what you actually owe.

Underpayment of Estimated Tax Penalty

If you should have been making quarterly estimated payments and didn’t (or underpaid), the IRS charges interest on the shortfall for each quarter. The rate is the federal short-term rate plus 3%, currently around 7-8%. It’s calculated per quarter, not annually.

Interest

Interest compounds daily on unpaid balances from the due date. The rate adjusts quarterly. It applies on top of penalties, not instead of them.

The Two-Week Action Plan

If you’re reading this on April 1 and haven’t started, here’s the priority order:

This week (April 1-7):

Confirm your ITIN is valid. If expired, start the W-7 renewal immediately.
Gather all income documents: K-1s, 1099s, rental income summaries, property sale closing statements
Check if your 2025 partnership return was filed. Chase down the K-1 if you don’t have it.
Calculate your Q1 2026 estimated tax payment

Next week (April 8-14):

If your return is ready: file it. Don’t wait until the 15th.
If your return isn’t ready: file Form 4868 for the extension AND pay your estimated balance due
Make your Q1 2026 estimated payment
Verify your payment went through (EFTPS confirmation, bank statement, etc.)

April 15:

Last day. If you haven’t filed or extended, do it today. Late is better than never.

Common Mistakes to Avoid

Confusing the extension to file with an extension to pay. Form 4868 gives you more time to file, not more time to pay. You still owe by April 15.
Assuming FIRPTA withholding covers everything. The 15% withholding on a property sale is based on the gross price, not your gain. Your actual tax could be higher or lower. File the return either way.
Forgetting estimated payments. If you had rental income in 2025 and expect similar income in 2026, you should be making quarterly payments starting April 15.
Filing the wrong form. NRAs file Form 1040-NR, not Form 1040. Using the wrong form delays processing and can trigger notices.
Skipping Form 8833 for treaty claims. The $1,000 penalty for not disclosing a treaty position is easy to avoid. Just file the form.
Waiting for a “perfect” return. If you’re missing one document, file what you have and amend later. An imperfect return filed on time beats a perfect return filed in October with penalties.

What You Need: The Document Checklist

Print this. Check it off. Bring it to your accountant.

– Valid ITIN (check expiration)
– Schedule K-1 from all US partnerships/S-Corps
– Form 1099 series (1099-INT, 1099-DIV, 1099-MISC, 1099-NEC)
– Rental income and expense summary for each property
– Property sale closing statements (if applicable)
– FIRPTA withholding certificates (Form 8288-A)
– Mortgage interest statements (Form 1098)
– Property tax statements for each property
– Depreciation schedules (from prior year return or cost segregation study)
– Property management fee summaries
– Insurance premium records
– HOA fee records
– Tax treaty country and article number (if claiming treaty benefits)
– Copy of passport (required for W-7 ITIN renewal)
– Prior year tax return (for reference and estimated payment calculations)
– US bank account details (for direct deposit of refund or payment setup)

The Bottom Line

April 15, 2026 is the deadline for your 2025 Form 1040-NR AND your Q1 2026 estimated tax payment
Extensions give you more time to file, not more time to pay. Estimate and pay by the deadline or face penalties and interest.
Check your ITIN now. If it’s expired, renewing takes 7-11 weeks. File the extension and submit W-7 with your return.
If you sold property in 2025, file early to speed up your FIRPTA refund
Don’t skip Form 8833 if you’re claiming treaty benefits. It’s a $1,000 mistake that takes 15 minutes to prevent.

How Celeraxiom Can Help

At Celeraxiom, we prepare 1040-NR returns for nonresident aliens with Florida rental property, partnership income, and property sales. If you’re behind on your 2025 filing, we can get your extension filed this week and your full return completed before the October deadline. We also handle estimated tax calculations, ITIN renewals, and FIRPTA refund claims. Two weeks is tight, but it’s enough if you start now.

Frequently Asked Questions

Do NRAs get an automatic extension to June 15?

No. The automatic 2-month extension to June 15 applies to US citizens and resident aliens living outside the United States. Nonresident aliens file by April 15. If you need more time, file Form 4868 by April 15 to get until October 15.

Can I file Form 1040-NR electronically?

It depends. E-filing for 1040-NR is available through tax software and tax preparers, but there are limitations. If you’re filing with a first-time ITIN application (Form W-7), the return must be mailed. If you have a valid ITIN, most tax professionals can e-file your 1040-NR.

What if I didn’t make estimated payments in 2025 and I should have?

You’ll owe an underpayment penalty calculated on Form 2210. The penalty is interest on the shortfall for each quarter you should have paid but didn’t. It’s not catastrophic, but it’s avoidable. Start making estimated payments for 2026 beginning April 15 to avoid the same issue next year.

My partnership hasn’t sent me a K-1 yet. What do I do?

If the partnership filed an extension, K-1s might not arrive until late summer or early fall. File Form 4868 to extend your personal return. If you can reasonably estimate your share of partnership income, make a tax payment by April 15 based on that estimate. You can always adjust when you file the actual return.

I only earned rental income from one Florida property. Do I really need to file?

Yes. If you earned rental income from US real property and it’s treated as effectively connected income (ECI), you need to file Form 1040-NR regardless of how small the amount. In fact, failing to file means you lose the right to claim deductions against that income, and the IRS can assess tax on the gross rental amount rather than the net profit.