IRS Form 673 Guide: Foreign Earned Income Withholding Rules

1. Introduction – What is Form 673?

IRS Form 673, officially titled Statement for Claiming Exemption From Withholding on Foreign Earned Income Eligible for the Exclusion(s) Provided by Section 911, is an official federal tax document governed by the Internal Revenue Service (IRS). It is used by United States citizens working abroad as employees.

Under Section 911 of the Internal Revenue Code, qualifying U.S. expatriates can exclude a significant portion of their foreign-earned wages from U.S. federal income tax through the Foreign Earned Income Exclusion (FEIE) and Foreign Housing Exclusion.

Form 673 acts as a formal written declaration submitted by an employee to their employer. It certifies that the employee expects to meet the legal qualifications for Section 911 exclusions, instructing the employer to stop or reduce U.S. federal income tax withholding from their paycheck.

2. Purpose of the Form

The primary purpose of Form 673 is to prevent double withholding and financial strain for American expatriates working overseas. Without Form 673, a U.S. employer is legally obligated to withhold U.S. federal income tax from an employee’s foreign paycheck, even if those wages will ultimately be tax-free under Section 911.

Form 673 solves the issue of unnecessary tax overwithholding. If an employer withhold U.S. income taxes all year, an expat must wait until filing their annual tax return to claim a refund. Form 673 adjusts payroll withholding in real time, allowing expats to keep their full qualifying earnings in each paycheck.

Additionally, Form 673 provides payroll protection for employers. Holding a completed, signed Form 673 on file provides the employer with legal authorization from the IRS to exempt the employee’s foreign wages from federal income tax withholding.

3. Who Needs to File This Form

Form 673 is completed by U.S. citizen employees working in foreign countries who expect to qualify for the Foreign Earned Income Exclusion or Foreign Housing Exclusion during the tax year.

To use Form 673, you must meet one of the two statutory Section 911 qualification tests:

• Bona Fide Residence Test: You are a U.S. citizen who is a bona fide resident of a foreign country (or countries) for an uninterrupted period that includes an entire calendar tax year.
• Physical Presence Test: You are a U.S. citizen or resident alien physically present in a foreign country (or countries) for at least 330 full days during any consecutive 12-month period.

4. Who Is Exempt / Not Required to File

Form 673 is an optional employee statement rather than a mandatory tax return. However, specific worker categories are legally ineligible to use it.

You should NOT complete or submit Form 673 if you belong to any of the following groups:

• U.S. Government Employees: Civilian or military personnel paid directly by the U.S. government or its agencies working overseas. U.S. government wages do not qualify for Section 911 exclusions.
• Self-Employed Individuals: Independent contractors and freelancers do not have payroll withholding; they manage tax obligations through quarterly estimated taxes and claim FEIE on Form 2555.
• Domestic U.S. Employees: Employees working physically within the United States or its territories.
• Workers Who Cannot Meet Qualification Tests: Employees who will not meet the 330-day physical presence test or bona fide residence test during the year.

5. When to File

Form 673 is an annual statement provided directly to your employer rather than submitted on a strict tax calendar deadline.

Keep these timing rules in mind:

• At Beginning of Tax Year: Give Form 673 to your employer at the start of each calendar tax year to ensure correct withholding for the entire year.
• Upon Moving Abroad: Submit the form immediately upon relocating overseas and starting foreign employment.
• Annual Renewal: Form 673 remains in effect only for the single calendar year specified on the form. You must submit a fresh Form 673 every year you remain employed overseas.
• Status Changes: If your situation changes mid-year and you no longer expect to qualify for Section 911 exclusions, you must notify your employer immediately to resume standard withholding.

6. Where and How to File

A common point of confusion is where to send Form 673. Form 673 is delivered directly to your employer’s HR or payroll department—it is NEVER mailed or filed with the IRS.

Hand-deliver or securely email the completed, signed Form 673 to your employer’s payroll administrator. Your employer keeps the document on file in their corporate payroll records as legal proof justifying why federal income taxes were not withheld from your foreign wages.

7. Step-by-Step Instructions to Fill the Form

Form 673 is a concise 1-page form organized into personal details, test qualification selection, and estimated exclusion calculations. Review the summary guide below.

Form Part	Section Title	Key Information to Disclose
Part I	Employee & Employer Details	Full legal name, SSN, foreign address, U.S. home address, tax year, and employer name.
Part II	Section 911 Qualification Test	Select Bona Fide Residence Test OR Physical Presence Test details and dates.
Part III	Estimated Exclusions	Calculate estimated Foreign Earned Income Exclusion and Foreign Housing Exclusion amounts.
Part IV	Signature & Affirmation	Employee signature and date under penalties of perjury.

Part I – Identification Information

Enter your full legal name, Social Security Number (SSN), primary foreign residential address, U.S. home address, and the specific calendar tax year for which you are claiming the withholding exemption. State your employer’s official company name.

Part II – Qualification Test Selection

You must complete either Box 1 (Bona Fide Residence Test) or Box 2 (Physical Presence Test):

• Bona Fide Residence (Box 1): State the foreign country of residence, the exact date residence was established, expected duration, and confirm whether you paid taxes to that foreign country.
• Physical Presence (Box 2): Enter the 12-month qualification period start and end dates, and confirm that you expect to be physically present in a foreign country for at least 330 full days during that period.

Part III – Estimated Exclusions and Signature

Part III estimates your total Section 911 exclusions for the tax year. Enter the statutory Foreign Earned Income Exclusion limit (indexed annually for inflation) and your estimated Foreign Housing Exclusion amount. Add both figures together; this represents the total portion of your foreign wages exempt from U.S. withholding. Sign and date the form under penalties of perjury.

8. Required Documents/Information Needed Before Filling

Before filling out Form 673 for your payroll department, gather your personal travel and employment details.

Ensure you have the following information on hand:

• Social Security Number: Valid SSN for U.S. payroll reporting.
• Foreign Address Records: Physical residential address in your foreign host country.
• Travel Logs: Exact arrival and departure dates to track 330 full days of foreign presence.
• Housing Expense Estimates: Estimated annual foreign housing costs (rent, utilities, real estate insurance) to calculate the housing exclusion.
• Statutory Exclusion Limits: Current IRS annual Foreign Earned Income Exclusion threshold figures.

9. Common Mistakes to Avoid

Errors involving Form 673 can lead to massive tax bills when filing annual returns. Avoid these frequent mistakes:

• Mailing Form 673 to the IRS: Sending the form to the IRS instead of giving it to your employer’s payroll department. The IRS does not process or retain Form 673.
• Filing as a U.S. Government Employee: Submitting Form 673 while working for the U.S. military or a federal agency overseas. Government wages are legally ineligible for Section 911 exclusions.
• Failing to Meet the 330-Day Requirement: Claiming withholding exemption under the Physical Presence Test but spending too many days traveling in the U.S., falling short of 330 full days abroad.
• Assuming Form 673 Replaces Your Tax Return: Believing that filing Form 673 means you do not have to file an annual U.S. tax return. You must still file Form 1040 and Form 2555 with the IRS every year.
• Forgetting Annual Renewal: Assuming Form 673 stays active indefinitely. You must submit a new Form 673 to your employer every year.

10. Penalties for Non-Filing or Errors

While Form 673 is a statement submitted to your employer, making false statements or failing to qualify for claimed exclusions carries serious financial and legal consequences.

Key risks and penalties include:

• Underwithholding Penalties: If you claim exemption on Form 673 but fail to qualify for Section 911 exclusions at year-end, you will owe massive back taxes plus IRS estimated tax underpayment penalties.
• Civil False Statement Penalty (IRC Section 6682): The IRS can assess a $500 civil penalty for submitting a false withholding statement to an employer without a reasonable basis.
• Criminal Penalties (IRC Section 7205): Willfully supplying false withholding information to an employer is a federal misdemeanor punishable by fines up to $1,000 and up to 1 year in prison.
• Unclaimed Paycheck Tax Benefits: If you fail to submit Form 673 to your employer, standard U.S. taxes will be withheld from every paycheck, reducing your monthly cash flow until you file for a refund at year-end.

11. Related Forms or Schedules

Form 673 is part of a broader set of international tax forms used by American expatriates:

• Form 2555: Foreign Earned Income (filed annually with Form 1040 to officially claim the Section 911 exclusions).
• Form 1040: U.S. Individual Income Tax Return.
• Form W-4: Employee’s Withholding Certificate (standard U.S. withholding form).
• Form 1116: Foreign Tax Credit (used to claim credits for foreign income taxes paid).

12. Frequently Asked Questions

1. What is IRS Form 673?

IRS Form 673 is an annual statement completed by U.S. citizens working abroad and submitted to their U.S. employer to claim an exemption from U.S. federal income tax withholding on qualifying foreign wages.

2. Do I mail Form 673 to the IRS?

No. Form 673 is delivered directly to your employer’s HR or payroll department. It is never mailed or filed with the IRS.

3. Who qualifies to submit Form 673 to their employer?

U.S. citizens working abroad as employees who expect to meet either the Bona Fide Residence Test or the 330-day Physical Presence Test under Section 911 qualify to submit Form 673.

4. Do U.S. military or government employees overseas qualify for Form 673?

No. Wages paid to U.S. civilian or military employees by the U.S. government or its agencies working overseas are legally ineligible for Section 911 exclusions, so Form 673 cannot be used.

5. Does submitting Form 673 replace my annual tax return filing?

No. Form 673 only adjusts monthly paycheck withholding. You are still required to file an annual federal income tax return (Form 1040) and Form 2555 with the IRS every year to formally claim the Foreign Earned Income Exclusion.

6. What happens if I move back to the U.S. mid-year?

If you return to the U.S. mid-year and no longer expect to meet Section 911 qualification tests, you must notify your employer immediately to revoke Form 673 and resume standard U.S. tax withholding.

13. Conclusion

IRS Form 673 is an essential payroll tool for American expatriates working overseas for U.S. employers. By certifying that your foreign wages qualify for Section 911 exclusions, it eliminates unnecessary U.S. tax withholding from your monthly paychecks.

To maximize your foreign earnings, verify that you meet the Physical Presence or Bona Fide Residence tests, complete Form 673 accurately, hand it to your payroll department, and remember to formally claim your exclusions on Form 2555 when filing your annual Form 1040.