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How do I file U.S. income tax as an expat in Taiwan? Form 1040 Guide

Updated: 5 days ago

If you are a U.S. citizen or resident living in Taiwan, you are still required to file a U.S. income tax return each year. The main form used is Form 1040, which is the standard IRS form for reporting your annual income, deductions, and tax liability.


On Form 1040, you will report wages, salary, taxable interest, capital gains, pensions, social security benefits, and other earnings. Based on this information, your Adjusted Gross Income (AGI) is calculated, which is then used to determine whether you owe additional taxes or qualify for a refund. Form 1040 Guide


Key things expats should know  Form 1040 Guide

  • Filing deadline: April 15 (automatic extension to June 15 for expats, with further extension available if needed)

  • Filing methods: E-file or mail

  • Filing status: Must be determined correctly (single, married filing jointly, etc.)

  • Deductions: You can choose between the standard deduction or itemized deductions (Schedule A)

  • Additional forms: Expats often need extra forms depending on income sources and foreign assets


Determining whether to use the standard deduction or to itemize is an important step, as it can have a significant impact on your taxable income.

Different Types of Form 1040

Depending on your individual circumstances, you may need to file a different variation of Form 1040: 

  • Form 1040-NR is for non-resident aliens or their representatives(link to previous article about tax residency). You may need to file a 1040-NR if you were engaged in trade or business in the U.S.

  • Form 1040-SR is a variation of the standard 1040, specifically for seniors (age 65 and order). It is nearly identical to form 1040. 

  • Form 1040-X is for taxpayers who need to make amendments to their return after having already filed a 1040. 


Form 1040 Schedules

The term “Schedule” is the IRS’ special term for “additional form” – schedules are used to provide supplemental information and calculate specific items that relate to the base form. Below is a summary of Form 1040’s schedules:


Schedule 1

For reporting common additional income sources or adjustments, such as:

  • Alimony

  • Gains or losses from the sale of business property

  • Unemployment compensation

  • Business income

  • Educator expenses

  • Student loan interest deduction

Schedule 2

For reporting additional taxes, divided into two parts:


  1. a. Alternative minimum tax 

    b. Repayment of excess premium tax credits for health insurance


  2. a. Self-employment taxes, 

    b. Unreported social security and Medicare tax,

    c. Tax on IRA’s or other tax-favored accounts, 

    d. Household employment taxes

    e. Repayment of first-time home buyer credit

    f. Net investment income tax

Schedule 3

For reporting additional (refundable and non-refundable) credits and payments:

  • Child and dependent care

  • Residential energy credits

  • Overpayment of taxes in previous years

  • Previously paid excess social security tax

Schedule A

Used to report all itemized deductions.

Schedule B

For reporting interest and dividend income over USD 1,500. Income of this type under USD 1,500 can be reported directly on Form 1040.

Schedule C

For reporting profit or loss from business. Typically used by independent contractors, freelancers, or owners of sole proprietorships or single-member LLCs

Schedule D

For reporting capital gains or losses from investments

Schedule E

For reporting income or losses from:

  • Rental real estate,

  • Royalties

  • Partnerships

  • S corporations

  • Estates and trusts

Schedule F

For reporting income or expenses from farming

Schedule H

For taxpayers who employ household workers, such as nannies or caretakers

Schedule J

For farmers and fishermen who wish to average their three previous years of tax to distribute tax liability

Schedule R

For claiming senior or disability tax credit

Schedule SE

For business owners or independent contractors (who made at least USD 400), to calculate self-employment tax

Schedule 8812

For claiming the Child Tax Credit and Credit for Other Dependents

For many taxpayers, the base 1040 form is enough to complete the filing process. However, if your return is more complicated, or if you’ve chosen to itemize your deductions, or claim credits, or have additional taxes owed, you will need to complete and submit the appropriate schedules and supplementary forms, in addition to the 1040. 


If filing online, tax software can help you determine which schedules are needed. Hiring a tax professional to assist with your return may also save you significant time and money, especially if you have diverse assets and sources of income.


Further Reference and Resources for Form 1040:

  • Form 1040 can be downloaded directly from the IRS website

  • Complete, official instructions from the IRS can be found here


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