US tax season checklist for expats 2026: essential documents and deadlines

The US tax season for expats in 2026 requires careful preparation, especially if you need to file additional forms like the FBAR or comply with FATCA. This US tax season checklist for expats 2026 will help you organize all necessary documents, deadlines, and steps to avoid penalties and optimize your tax return. As an expat, you must report global income, foreign bank accounts, and financial assets, even if you live outside the US.

Key deadlines and considerations for expats

The standard deadline for filing your federal tax return (Form 1040) is April 15, 2026, but expats receive an automatic extension until June 15, 2026. If you need more time, you can request an additional extension until October 15, 2026. However, the FBAR (FinCEN Form 114) is due on April 15, 2026, with an automatic extension to October 15, 2026. Missing these deadlines can result in significant penalties.

Use this checklist in Foco to group all your tasks under the 'Expat tax filing' project and assign due dates for both execution and deadlines. This way, you can filter by timelines and prioritize urgent tasks, such as gathering documents or consulting a tax professional specializing in expat taxes.

• Gather W-2, 1099, and other income documents from US sources
• Collect records of foreign income (salaries, rentals, investments, etc.) and convert them to US dollars using the IRS annual average exchange rate
• Obtain foreign bank account statements to identify maximum annual balances in individual and joint accounts (required for FBAR and FATCA)
• Check if you qualify for the Foreign Earned Income Exclusion (Form 2555) or the Foreign Tax Credit (Form 1116)
• Review whether you need to file Form 8938 (FATCA) to report foreign financial assets, based on residency and value thresholds
• Prepare detailed information on foreign bank accounts (account numbers, institution names, addresses, and maximum annual balances) for the FBAR (FinCEN Form 114)
• Consult a tax professional specializing in expat taxes to optimize deductions, credits, and comply with obligations like FATCA or the Foreign Account Tax Compliance Act
• Apply for an Individual Taxpayer Identification Number (ITIN) if you don’t have an SSN and need to file a return
• Complete Form 1040 (or 1040-SR for those over 65) with all necessary schedules (A, B, C, D, etc.) based on your income and deductions
• File the FBAR (FinCEN Form 114) electronically before the deadline, even if you don’t owe taxes
• Verify if you need to file Form 8621 for investments in foreign funds (PFICs) and gather the required documents
• Review tax treaties between the US and your country of residence to avoid double taxation and apply specific benefits
• Pay any taxes owed by June 15, 2026, to avoid interest and penalties, even if you file an extension
• Request an extension until October 15, 2026, if you need more time to file Form 1040 (use Form 4868)
• Keep copies of all filed forms, supporting documents, and filing confirmations for at least 7 years
• Check if you need to report interest in foreign bank accounts (Form 1040, Schedule B) even if they don’t exceed the FBAR threshold
• Determine if you qualify for the Foreign Housing Exclusion (part of Form 2555) and gather rent receipts or housing expense records
• Review whether you need to file Form 3520 for transactions with foreign trusts or gifts over $100,000 from non-US persons
• Check if you have state tax obligations in the US (some states, like California or Virginia, tax expats based on specific rules)