US expats must meet key 2026 tax deadlines: April 15 filing, June 15 automatic extension, and October 15 IRS extension. File FBAR (FinCEN 114) if foreign accounts exceed $10K. Use Forms 2555, 8938, 1116 to reduce tax liability. Plan estimated taxes and understand totalization agreements. Streamlined Filing aids compliance; professional IRS audit help is advised.
