Question 1

I am a USA citizen and also a Thai born citizen. I do my taxes with my husband jointly every year when needed. Currently, my husband is on a retirement visa, and we both live in Thailand from money brought in before 2024. My husband is older then me and will collect social security before me. I wonder if either of us will be obligated to pay additional tax on social security once we both collect? Also we both have a 401k and will cash it out in the future and bring that money or transfer that money to Thailand for expenses. Will we be taxed any additional tax here in Thailand, 401k money coming from the USA?

Chas Begley · Accepted Answer

Social Security is not an assessable income source in Thailand due to the US & Thai Double Taxation agreement. This means Thailand has no right to tax this.

401k is an assessable income in Thailand if remitted. If you do remit your 401k to Thailand, then this is assessable as income. You can offset any taxes with the taxes paid on this money in the US as a tax credit.

Learn more about Double Tax Agreements for expats in Thailand by watching our video here.

Question 2

I am a USA citizen and also a Thai born citizen. I do my taxes with my husband jointly every year when needed. Currently, my husband is on a retirement visa, and we both live in Thailand from money brought in before 2024. My husband is older then me and will collect social security before me. I wonder if either of us will be obligated to pay additional tax on social security once we both collect? Also we both have a 401k and will cash it out in the future and bring that money or transfer that money to Thailand for expenses. Will we be taxed any additional tax here in Thailand, 401k money coming from the USA?

Chas Begley · Accepted Answer

Social Security is not an assessable income source in Thailand due to the US & Thai Double Taxation agreement. This means Thailand has no right to tax this.

401k is an assessable income in Thailand if remitted. If you do remit your 401k to Thailand, then this is assessable as income. You can offset any taxes with the taxes paid on this money in the US as a tax credit.

Learn more about Double Tax Agreements for expats in Thailand by watching our video here.

Explore Related Content

Thailand Flood Tax Relief 2026: What Expats should Check

Why Thailand Wants to Join the OECD: What It Could Mean for Expats

UK Inheritance Tax After Moving to Thailand: How Long Is the IHT Tail?

Thai Tax Essentials for Expats 2026

Need Help with Your Thai Tax Position?

Tax Filing Services

Tax Consultancy

TIN Application Service