U.S. Taxes for Americans Living in Mexico: The 2026 Guide

Key takeaways

• Moving to Mexico does not end your US filing obligation, because the United States taxes its citizens and green card holders on worldwide income wherever they live.
• Mexico decides tax residency mainly by where you have your home (casa habitación), not by a day count or by the type of visa you hold.
• The US–Mexico income tax treaty has been in force since December 28, 1993, but its saving clause means it rarely lowers US tax for US citizens.
• There is no US–Mexico Social Security totalization agreement in force, so dual contributions are possible and there is no certificate of coverage to fix them.
• Mexican banks report US account holders to the IRS through Mexico's tax authority, so FBAR and Form 8938 compliance matters from the first year.

Do Americans living in Mexico still file US taxes?

Generally, yes. The IRS says US citizens and residents abroad generally file in the same way as those at home, with the requirement depending on worldwide gross income, filing status and age (IRS, "U.S. citizens and residents abroad – Filing requirements"). Income excluded under the Foreign Earned Income Exclusion still counts toward the threshold.

Thresholds for tax year 2026. The filing thresholds track the standard deduction. For 2026 the standard deduction is $16,100 for single filers and married filing separately, $32,200 for married filing jointly, and $24,150 for heads of household (IRS news release on Rev. Proc. 2025-32). These figures are indexed annually. Self-employed people generally must file if net self-employment earnings are $400 or more, regardless of the general threshold.

Deadlines for the 2026 return. The regular due date is April 15, 2027. If you live and have your main place of business outside the United States and Puerto Rico on that date, you get an automatic two-month extension to June 15, 2027. A further four-month extension is available with Form 4868 filed before June 15, but it is not an extension to pay, and interest generally accrues on unpaid tax from April 15 (IRS, "Where and When to File and Pay").

FBAR. FinCEN Form 114 is filed separately through FinCEN's BSA e-filing system; it is generally due April 15 with an automatic extension to October 15.

When does Mexico treat you as a tax resident, and what does it tax?

Residency tests. Under Article 9 of the Federal Fiscal Code (Código Fiscal de la Federación, CFF), you are resident if you have established your home (casa habitación) in Mexico. If you also have a home elsewhere, you are resident when your center of vital interests is in Mexico, for example when more than 50% of your income for the calendar year is Mexican-source or Mexico is the main center of your professional activities — this guide worked from a secondary reproduction of CFF Art. 9, not the official gazette text. People temporarily occupying property for tourism, with their center of vital interests abroad, have not established a home (Reglamento del CFF, Art. 5).

Three practical points follow:

• There is no 183-day test in Mexican domestic law. Residency can start the day you set up a home. The 183-day figures in the treaty (Articles 14 and 15) govern who may tax certain income, not who is resident.
• Immigration status is a separate question. A residente temporal or permanente card does not by itself make you a tax resident, and a visitor can be one if their home is in Mexico.
• Mexican nationals, including dual citizens, are generally presumed resident unless they prove otherwise.

What Mexico taxes. The charging provision is Article 1, fraction I, of the Income Tax Law (Ley del Impuesto sobre la Renta, LISR): residents in Mexico are taxed on all their income, wherever the source of that income is located. Mexico is therefore a worldwide system for residents. Nonresidents are taxed only on Mexican-source income or income attributable to a Mexican permanent establishment (LISR Art. 1, fractions II and III). The tax year is the calendar year, the same as the US.

Rates. Individual rates are progressive, from 1.92% to a top marginal rate of 35% — this figure comes from a secondary summary, not the LISR text itself. The 2026 economic package, published in the Diario Oficial on November 7, 2025, did not change the individual tariff, according to the Mexican Institute of Public Accountants. Companies pay 30% (LISR Art. 9).

Local filing. Individuals file an annual return in April for the previous year (LISR Art. 150); the 2026 return is due by April 30, 2027. Employees of a single Mexican employer earning under MXN 400,000 are generally exempt, per secondary press reports. Residents with foreign-source income will usually need to file and may owe monthly provisional payments.

Small business regime (RESICO). Individuals with business, professional or rental income up to MXN 3.5 million a year may opt for the Régimen Simplificado de Confianza, which taxes gross receipts at 1% to 2.5% with no deductions; nonresidents with a Mexican permanent establishment are excluded — again drawn from a secondary summary of LISR Art. 113-E rather than the statute text.

Recent guidance to watch. The 2026 package raised late-payment surcharges, increased bank withholding on interest, and offered a temporary 15% rate on repatriated funds, per secondary press coverage. Reports differ on whether RESICO individuals were relieved of the annual return; confirm in the final DOF text and the 2026 Miscellaneous Tax Resolution. The consolidated LISR on the Chamber of Deputies site still showed "última reforma DOF 01-04-2024" when accessed, so recent amendments may be missing there.

Is there a US–Mexico tax treaty?

Yes. Signed September 18, 1992, the treaty entered into force December 28, 1993, effective for most provisions January 1, 1994. It has protocols of 1992 and 1994, and the IRS lists a later protocol dated 2002–2003 (IRS, Mexico tax treaty documents). It covers US federal income tax, expressly excluding social security taxes, and Mexican income tax under the LISR (Art. 2).

Saving clause. Article 1(3) lets each country tax its residents, and the United States its citizens, as if the treaty did not exist. Exceptions in Article 1(4) still apply to US citizens, including Articles 19(1)(b) (social security), 19(3) (alimony), 24 (double tax relief), 25 (non-discrimination) and 26 (mutual agreement). In practice, a US citizen in Mexico generally cannot use the treaty to cut US tax on wages, business income or private pensions.

Tie-breaker. If both countries consider you resident, Article 4(2) looks in order at a permanent home, then center of vital interests, then habitual abode, then nationality, then agreement between the authorities. A 1992 protocol adds that Mexico treats a US citizen or green card holder as a US resident only if they have a substantial presence in the US or would win the tie-breaker under the first two tests (Protocol 1, para. 2(a)). For most Americans who have moved to Mexico, the tie-breaker points to Mexico.

Pensions and Social Security. Private pensions are taxable only in the recipient's country of residence (Art. 19(1)(a)), but the saving clause lets the US keep taxing its citizens. Social security benefits and other public pensions paid by one country to a resident of the other, or to a US citizen, are taxable only in the paying country (Art. 19(1)(b)), and this rule is excepted from the saving clause. Read literally, US Social Security paid to an American in Mexico is taxable only in the US, and a Mexican IMSS pension paid to a US citizen only in Mexico — this reading has not been confirmed against the 1992 Treasury Technical Explanation.

Dividends. Mexico's tax on dividends paid to a US resident is capped at 10%, or 5% for companies owning at least 10% of the voting stock (Art. 10(2)). A US citizen living in Mexico is generally not a US resident under the treaty, so the cap rarely helps them. Whether the later protocol amended the dividend article for some corporate shareholders was not confirmed for this guide.

How do you avoid paying tax twice?

Most Americans in Mexico use one or both of two US tools. They are different and cannot be stacked on the same income.

Foreign Earned Income Exclusion (Form 2555). For 2026 you can exclude up to $132,900 of foreign earned income (IRS, Rev. Proc. 2025-32 release; indexed annually) if you meet the bona fide residence or physical presence test. The exclusion covers earned income only, not pensions, dividends or rent, and it does not reduce US self-employment tax. Income you exclude cannot also generate a foreign tax credit.

Foreign Tax Credit (Form 1116). You credit Mexican income tax against US tax on the same foreign-source income, by category (generally "general" for wages and business income and "passive" for investment income). Unused credits can generally be carried back one year and forward ten.

How the treaty orders the credits. Article 24(4) applies to a US citizen resident in Mexico. Mexico first credits only the US tax the US could impose if you were not a citizen (for example, treaty-rate withholding on US dividends). The US then credits the remaining Mexican tax, and treats the income as Mexican-source to the extent needed to make room for that credit. Mexico's domestic law mirrors this: residents taxed abroad because of their nationality can credit foreign tax only up to the amount they would have paid without that status (LISR Art. 5).

Which tends to fit.

• Employees with Mexican-taxed wages often find the credit sufficient, since Mexican rates approach US rates at higher incomes, and it preserves IRA eligibility.
• Self-employed people in RESICO pay little Mexican tax, so the credit leaves a US balance; the exclusion cuts income tax but not self-employment tax.
• Unsettled point: whether a gross-receipts tax like RESICO is a creditable "income tax" under the 2022 US foreign tax credit regulations. One view: the treaty covers all LISR taxes, so it is creditable under Articles 2 and 24. The other: it fails the regulatory net-gain test unless relief applies. IRS Notices 2023-55 and 2023-80 gave temporary relief from parts of those regulations, though this guide did not confirm how that relief applies here. Get advice before claiming the credit.

Timing. Both countries use the calendar year, so there is no fiscal-year mismatch, though Mexico's monthly provisional payments and US quarterly estimates still need cash-flow planning.

Social Security: will you pay both?

There is no totalization agreement in force. Mexico does not appear on the Social Security Administration's list of agreements in force (SSA, accessed October 11, 2026). An agreement signed in 2004 appears never to have entered into force, though this guide did not confirm its current status directly with the SSA. There is therefore no certificate of coverage and no exemption to claim. Keep this separate from the income tax treaty, which does not cover social security contributions (Treaty Art. 2(3)(a)).

What applies depends on how you work:

• Employee of a Mexican employer. IMSS coverage is mandatory, per a secondary reproduction of the Ley del Seguro Social, Art. 12. US FICA does not apply unless the employer is a foreign affiliate of a US company with a section 3121(l) agreement (SSA overview).
• Employee of an American employer working in Mexico. US Social Security keeps covering US citizens and residents employed abroad by American employers, however long the assignment (SSA overview). Whether IMSS also applies depends on whether a Mexican employment relationship exists. Dual contributions are possible.
• Self-employed. US citizens remain subject to US self-employment tax abroad (SSA overview). IMSS is voluntary for independent workers, per a secondary reproduction of the Ley del Seguro Social, Art. 13, so most self-employed Americans pay only the US tax.

Effect on US benefits. IMSS credits cannot be combined with US credits, because only agreement countries allow totalization (SSA overview). The Social Security Fairness Act of January 2025 repealed the Windfall Elimination Provision, which had reduced US benefits for some people with foreign pensions — included here as background, not independently re-verified for this guide.

Which US forms apply to accounts and assets in Mexico?

• FBAR (FinCEN Form 114): required if the combined value of your foreign financial accounts exceeds $10,000 at any time in the year, including accounts you can only sign on (IRS). This threshold is not indexed.
• Form 8938: for taxpayers living abroad, required if specified foreign financial assets exceed $200,000 at year-end or $300,000 at any time (single or separate filers), or $400,000 and $600,000 for joint filers (IRS, "Do I need to file Form 8938"). These thresholds are not indexed. You only file it if you must file a tax return.
• Mexican banks and FATCA. The US–Mexico Model 1 FATCA agreement has been in force since April 10, 2014 (US Treasury FATCA page). Mexican banks report US account holders to the SAT, which forwards the data to the IRS, so expect to provide a Form W-9.
• CRS. Mexico was an early adopter of the OECD Common Reporting Standard, with first exchanges in 2017, per secondary compilations of CRS participants. Accounts in third countries may be reported to Mexico once you are resident there.

Local pensions, retirement accounts and investment funds

Afores. The IRS has not specifically addressed Mexico's individual retirement accounts (Administradoras de Fondos para el Retiro). Open questions: whether an Afore is a foreign trust (Forms 3520/3520-A), whether it qualifies for relief under Rev. Proc. 2020-17 or the 2024 proposed section 6048 regulations, and how contributions and growth are taxed. The IRS notes that a foreign pension may be treated as a trust, and that Rev. Proc. 2020-17 relieves only Form 3520 reporting, not FBAR, Form 8938 or tax (IRS filing requirements page). The FATCA agreement's Annex II is reported, in secondary summaries, to exclude Afore savings from bank reporting, which does not settle your own reporting. Treat this as unsettled and document your position.

Mexican investment funds. Mexican mutual funds (fondos de inversión) are commonly organized as sociedades anónimas de capital variable, which the US per se list treats as corporations (Treas. Reg. §301.7701-2(b)(8)) — though this guide did not independently confirm that organizational detail. Such a fund is very likely a PFIC, with annual Form 8621 filing and punitive default taxation unless an election is available. CETES held directly are debt, not PFIC shares, though the account counts for FBAR and Form 8938.

Pension distributions. Private pensions are taxable in the US for citizens; public social security pensions follow Article 19(1)(b).

Running a business or company in Mexico

Check the classification first. A Mexican Sociedad Anónima (including S.A. de C.V.) is on the per se corporation list and is always a corporation for US purposes; it cannot elect otherwise (Treas. Reg. §301.7701-2(b)(8)). A Sociedad de Responsabilidad Limitada (S. de R.L.) is not on the list. It is an eligible entity that generally defaults to corporation status when all members have limited liability, and can elect partnership or disregarded status on Form 8832 — the per se status is confirmed directly, but this default-classification detail was not independently verified. A Sociedad Civil is also not on the per se list, per secondary sources.

If it is a corporation and Americans own more than 50%: it is likely a controlled foreign corporation, with Form 5471 and possible current US tax under Subpart F or the regime formerly called GILTI. For tax years beginning after December 31, 2025, Public Law 119-21 (signed July 4, 2025) renamed GILTI "net CFC tested income" (NCTI) and changed its deduction and credit percentages, per secondary summaries of the law. Individual shareholders often fare worse than corporate ones unless they make a section 962 election. Mexico's 30% corporate rate (LISR Art. 9) helps, but the NCTI and credit interaction needs professional modeling.

If you operate as an individual (persona física con actividad empresarial) or through a disregarded entity, profits are generally subject to US self-employment tax, and Mexico taxes you under the business regime or RESICO.

Buying, renting and selling property

Owning in the restricted zone. Foreigners generally hold coastal and border-zone homes through a bank trust (fideicomiso). In Rev. Rul. 2013-14 the IRS held that a typical fideicomiso, where the bank only holds legal title to the property, is not a trust for US tax purposes, so no Forms 3520/3520-A. The ruling does not cover fideicomisos holding other assets or giving the bank wider powers (IRS, IRB 2013-26; scope limits per secondary commentary).

Selling your Mexican home.

• US side: the section 121 exclusion ($250,000, or $500,000 for joint filers) generally applies to a main home anywhere, including Mexico, if the ownership and use tests are met.
• Mexican side: a resident's home sale is exempt if the price does not exceed 700,000 UDIS, the sale is executed before a notary, and the seller has not used the exemption in the previous three years, declaring this to the notary, per secondary summaries of LISR Art. 93, fraction XIX(a). UDIS are an inflation-indexed unit published by the Bank of Mexico, so the peso value changes daily. Above the limit the excess is taxable, and the notary computes and withholds the tax, per the same secondary sources. The treaty lets Mexico tax gains on Mexican real property (Art. 13(1)), with a US credit under Article 24.

Currency gain on a peso mortgage. If the peso weakens before you repay a peso loan, you may have a taxable US exchange gain on the principal; a loss on a personal-use loan is generally not deductible.

Rental income. Mexico taxes rent on Mexican property whether or not you are resident; nonresidents may elect net-basis taxation (Treaty Art. 6(5)). In the US, report it on Schedule E, generally depreciated under the alternative system for foreign property, and credit the Mexican tax.

Employment, equity compensation and remote work for a US employer

Source. Wages are generally sourced where the work is physically performed. Work done while living in Mexico is foreign-source, even if paid by a US company into a US account. That matters for both the exclusion and the credit.

Withholding on both sides. A US employer usually keeps withholding US income tax (unless you adjust your W-4) and FICA, but not Mexican tax. As a Mexican resident you may need to make your own provisional payments on that salary. A remote employee can also create Mexican permanent establishment risk for the employer, which may affect whether it allows the arrangement.

RSUs and options. The US generally sources equity compensation by workdays over the vesting period, so an award vesting after you move may be partly US-source. Mexico generally taxes such awards to residents as employment-type income when acquired. Model each vest to avoid stranded credits.

Leaving Mexico

Mexican side. People who stop being Mexican tax residents must file a notice with the SAT no later than 15 days before the change of residence, per a secondary reproduction of CFF Art. 9. Mexican nationals who move to a jurisdiction with a preferential tax regime may remain Mexican residents for several years. There is no general exit tax on individuals' unrealized gains comparable to the US expatriation tax.

US side. Leaving Mexico changes nothing for a US citizen's filing. US exit tax rules (section 877A, Form 8854) apply only on renouncing citizenship or ending long-term green card status. FBAR and Form 8938 still apply for any year you held Mexican accounts.

Mistakes Americans commonly make in Mexico

1. Assuming residency waits for 183 days. Mexico's test is the home and center of vital interests; it can begin on arrival.
2. Treating a residency card as a tax status. Immigration and tax residency are decided under separate laws.
3. Buying Mexican mutual funds through a local bank. They are likely PFICs.
4. Assuming the treaty exempts US wages or pensions. The saving clause generally prevents that.
5. Expecting a certificate of coverage. Without a totalization agreement, none exists.
6. Choosing RESICO without modeling the US result. Low Mexican tax means little credit, and self-employment tax applies in full.
7. Misjudging a fideicomiso. Compare the deed with Rev. Rul. 2013-14 before deciding on Forms 3520.
8. Forgetting Mexican accounts are already reported to the IRS. Late FBARs are easier to fix before the IRS makes contact.

Checklist

Before moving

• Decide when you will set up a home in Mexico.
• Check whether your US broker will keep a Mexico-resident account open.
• With an American employer, confirm payroll and Mexican withholding in writing.

First 90 days

• Register with the SAT for an RFC if you will have Mexican income.
• Track maximum account balances for the FBAR.
• Have any fideicomiso deed reviewed against Rev. Rul. 2013-14.

Every year

• Mexican return by April 30; US return by June 15, or October 15 with Form 4868.
• FBAR (see deadline above) and Form 8938 with the return; Forms 8621 or 5471 if applicable.

Before leaving

• File the SAT change-of-residence notice on time.
• Plan the timing of any home sale for both the Mexican exemption and section 121.
• Decide what happens to your Afore and Mexican accounts, and keep records for future US filings.

Frequently asked questions

Do I pay taxes in Mexico if I work remotely for a US company? Generally yes, if you are a Mexican tax resident, since Mexico taxes residents on worldwide income.

Is US Social Security taxed in Mexico? Read literally, treaty Article 19(1)(b) makes it taxable only in the US. Confirm with the Technical Explanation.

Can I use the Foreign Earned Income Exclusion in Mexico? Yes, if you meet the residence or presence test: up to $132,900 for 2026, earned income only, with no effect on self-employment tax.

Do I need to report my fideicomiso to the IRS? Not as a foreign trust if it matches Rev. Rul. 2013-14; rental income is still reportable.

Is there a US–Mexico totalization agreement? None is in force as of October 2026, per the SSA's list.

Do Mexican banks report Americans to the IRS? Yes, through the SAT under the Model 1 FATCA agreement.

When to hire a professional

• US expat tax preparer (CPA or enrolled agent): for any year with Mexican-taxed income, or to choose between the exclusion and the credit.
• Mexican contador público: for SAT registration, provisional payments, RESICO and the annual return.
• Cross-border tax attorney: for a Mexican company, Afore and PFIC positions, or past non-filing.
• Mexican notary and real estate attorney: for fideicomiso deeds and home sales.
• Payroll or global mobility adviser: for US employers with staff in Mexico.

Sources

Primary sources, accessed October 11, 2026.

Source	URL	Used for	Date of page
IRS, Mexico tax treaty documents	https://www.irs.gov/businesses/international-businesses/mexico-tax-treaty-documents	Treaty documents index	Accessed Oct. 11, 2026
US–Mexico Income Tax Convention with Protocols 1 and 2	https://www.irs.gov/pub/irs-trty/mexico.pdf	Treaty articles	Accessed Oct. 11, 2026
SSA, U.S. International Social Security Agreements	https://www.ssa.gov/international/agreements_overview.html	Totalization agreement status	Accessed Oct. 11, 2026
IRS, U.S. citizens and residents abroad – Filing requirements	https://www.irs.gov/individuals/international-taxpayers/us-citizens-and-residents-abroad-filing-requirements	Filing requirements	Accessed Oct. 11, 2026
IRS, Where and When to File and Pay	https://www.irs.gov/individuals/international-taxpayers/us-citizens-and-resident-aliens-abroad-where-and-when-to-file-and-pay	Deadlines	Accessed Oct. 11, 2026
IRS, Do I need to file Form 8938	https://www.irs.gov/businesses/corporations/do-i-need-to-file-form-8938-statement-of-specified-foreign-financial-assets	Form 8938 thresholds	Accessed Oct. 11, 2026
IRS, 2026 inflation adjustments (Rev. Proc. 2025-32)	https://www.irs.gov/newsroom/irs-releases-tax-inflation-adjustments-for-tax-year-2026-including-amendments-from-the-one-big-beautiful-bill	2026 thresholds, FEIE	Accessed Oct. 11, 2026
26 CFR §301.7701-2 (per se corporation list)	https://www.law.cornell.edu/cfr/text/26/301.7701-2	Entity classification	Accessed Oct. 11, 2026
US Treasury, FATCA page	https://home.treasury.gov/about/offices/tax-policy/foreign-account-tax-compliance-act	Mexico FATCA Model 1	Accessed Oct. 11, 2026
Ley del Impuesto sobre la Renta, consolidated text	https://www.diputados.gob.mx/LeyesBiblio/pdf/LISR.pdf	Mexican income tax law	Accessed Oct. 11, 2026
Reglamento del Código Fiscal de la Federación	https://www.gob.mx/cms/uploads/attachment/file/494010/Reglamento_del_C_digo_Fiscal_de_la_Federaci_n.pdf	Residency regulations	Accessed Oct. 11, 2026
IRS, Internal Revenue Bulletin 2013-26 (Rev. Rul. 2013-14)	https://www.irs.gov/irb/2013-26_IRB	Fideicomiso ruling	Accessed Oct. 11, 2026
mley.mx, CFF Art. 9 reproduction (secondary)	https://mley.mx/CFF/articulo/9o/	Residency test text	Accessed Oct. 11, 2026
IDC Online, home-sale exemption under LISR Art. 93-XIX (secondary)	https://idconline.mx/fiscal-contable/2024/03/21/venta-de-casa-habitacion-de-asalariados	Home-sale exemption	Accessed Oct. 11, 2026
IMCP, 2026 tax reform press bulletin (secondary)	https://imcp.org.mx/wp-content/uploads/2025/11/Boletín-de-Prensa-Noviembre-2025.pdf	2026 reform summary	Accessed Oct. 11, 2026
SDV Asesores, LISR Art. 113-E and Ley del Seguro Social compendium (secondary)	https://sdv.com.mx/compendio/ley-isr/articulo-113-e/	RESICO, IMSS	Accessed Oct. 11, 2026
Justia México, Ley del Seguro Social Arts. 12–13 (secondary)	https://mexico.justia.com/federales/leyes/ley-del-seguro-social/titulo-segundo/capitulo-i/	IMSS coverage rules	Accessed Oct. 11, 2026
Aprio, summary of Rev. Rul. 2013-14 scope (secondary)	https://aprio.com/?p=12450	Fideicomiso ruling scope	Accessed Oct. 11, 2026
Rosemont, OECD CRS early adopter list (secondary)	https://rosemont-int.com/en/article/-3/automatic-exchange-of-information-for-tax-purposes-oecd-update	CRS participation	Accessed Oct. 11, 2026
Bonadio, OBBBA international changes (NCTI) (secondary)	https://www.bonadio.com/article/international-tax-reform-under-the-one-big-beautiful-bill-global-businesses/	NCTI summary	Accessed Oct. 11, 2026
Center for Financial Stability, Mexico FATCA IGA Annex II summary (secondary)	https://centerforfinancialstability.org/wp/?p=950	Afore FATCA treatment	Accessed Oct. 11, 2026

For your own situation, such as when your Mexican residency started or whether the exclusion or the credit suits you, you can work through the details with the TaxLatitude assistant.

This guide is educational and is not personalized tax advice.