Mexico Withholding Tax on Payments to Foreign Residents: A Payer's Guide

A vendor contract signed with a foreign party usually fixes a price in dollars and says little about tax. When the payment is sourced in Mexico, the paying company is the one that must withhold, and the exposure sits in its books, not the vendor's.

At Soulbit Academy we explain Mexican withholding tax on payments to foreign residents from the payer's side, as of October 2026: which payments trigger it, which rate applies, how a dollar payment is converted and how to treat a contract that fixes the net amount. The Colombian counterpart is in our guide to withholding tax on payments abroad from Colombia; this article covers only the Mexican system.

Mexico withholding tax on payments to foreign residents: which payments have a Mexican source

Mexican withholding tax applies when income comes from a source of wealth located in Mexico and the foreign resident has no permanent establishment in the country, or the income is not attributable to it. That is article 153 of Title V of the Income Tax Law (LISR), whose current text should be confirmed in the PDF published by the Chamber of Deputies.

The source does not depend on where the vendor sits or on the contract currency. The law defines it payment type by payment type, and three tests come up often for a company in Mexico.

The first is where a service is performed: independent personal services are Mexican-sourced when performed in the country (article 156). The second is where a right is used: royalties and technical assistance are Mexican-sourced when the property or rights are used in Mexico or when a Mexican resident pays them (article 167). The third is the payer's residence: interest is Mexican-sourced when a resident of Mexico pays it (article 166).

A service performed entirely abroad, not paid to a related party and not fitting royalties or technical assistance, does not create Mexican-source income by itself. Article 156 does presume, absent proof to the contrary, that a service is performed in Mexico when a Mexican resident pays it to a related foreign resident.

Article 153 adds a rule many contracts overlook: payments made in connection with Title V activities that benefit the foreign resident count as income, even when they only spare the resident an expense. Paying a vendor's cost on its behalf can therefore be income to that vendor.

Mexican withholding rates: services, royalties, technical assistance, interest and dividends

The withholding rate is 25% of the whole payment, with no deductions, for independent services, general royalties, technical assistance and property rental; dividends bear 10% and interest varies. Table 1 summarizes the rates in the text consulted in October 2026.

Type of payment	When it has a Mexican source	Withholding rate	LISR article
Independent personal services (fees)	The service is performed in Mexico, or presumed if a resident pays a related party abroad	25% of the total, no deductions; exempt if paid by a foreign resident with no Mexican link and a stay under 183 days	156
General royalties and technical assistance	The property or rights are used in Mexico, or a Mexican resident pays	25% of the income, no deductions	167, section II
Royalties for patents, trademarks, trade names and advertising	Same test as royalties	Top rate of the article 152 tariff	167, paragraph after the sections
Interest	A Mexican resident pays it, or the capital is placed or invested in Mexico	10%, 4.9%, 15% or 21% depending on the lender and instrument; otherwise the top rate of the article 152 tariff	166
Dividends or profits	A Mexican-resident legal entity distributes them	10% of the dividend, as a final tax	164, section I
Use of real estate and certain movable property	The property is in Mexico, or the movable property is delivered or used here	25% of the income, no deductions	158

One nuance prevents common errors: how the contract is characterized. The same license can be treated as a royalty, a service or technical assistance depending on what is transferred, and the rate changes with it. If one contract bundles a patent with other items and the share of each cannot be told apart, article 167 applies the section II rate to the whole payment.

Which rate applies if the payment is for software or a usage license?

The rate depends on how the contract is characterized under article 167, not on whether it is called software. If the use of a protected right is granted, it is usually analyzed as a royalty; if a service is rendered with no rights granted, the analysis differs. Ask your tax adviser for the characterization in writing before the first payment.

The exchange rate: how to convert a dollar payment into pesos for the withholding

Withholding on a foreign-currency payment is computed by converting to pesos on the date the consideration becomes due or is paid, whichever comes first. Article 153 of the LISR says so, and it also requires the withholding agent to remit an amount equal to what should have been withheld on that date.

The rate comes from article 20 of the Federal Tax Code (CFF), whose published text shows April 9, 2026 as its latest reform. The rate at which the foreign currency was acquired is used. If none was acquired, the rate Banco de Mexico published in the Official Gazette (DOF) the day before the tax arises applies. If nothing was published that day, the last published rate applies.

In practice this has an accounting effect. The payment to the vendor, the withholding and the exchange difference can land on different dates and at different rates if the company buys dollars days before paying. Set a policy on who documents the rate for each payment and keep the support.

An example with assumptions, not real data: a company pays 20,000 dollars of technical assistance with a 25% withholding. The withholding is 5,000 dollars; at an assumed rate of 17.50 pesos per dollar it is remitted as 87,500 pesos. At an assumed 18.50, the same withholding would be 92,500 pesos.

Gross-up: what happens when the contract fixes the net amount

When a contract guarantees the vendor an amount net of taxes, the company in Mexico bears the tax and its amount is added to the base. Article 153 of the LISR provides that tax the payer covers on behalf of the taxpayer is itself income under Title V, subject to the rules of the type of income that gave rise to it.

The result is arithmetic. The gross amount is the net amount divided by one minus the withholding rate, and the withholding is computed on that gross. Table 2 compares the two scenarios for a technical assistance fee with the assumptions shown.

Item (illustrative assumptions)	Contract fixes the gross	Contract fixes the net
Agreed base amount	15,000 dollars gross	15,000 dollars net
Assumed withholding rate	25%	25%
Gross amount on which tax is withheld	15,000 dollars	20,000 dollars (15,000 divided by 0.75)
Withholding in dollars	3,750 dollars	5,000 dollars
Withholding in pesos, at an assumed 17.50	65,625 pesos	87,500 pesos
Amount the vendor receives	11,250 dollars	15,000 dollars
Total cost to the company in Mexico	15,000 dollars	20,000 dollars

Who should decide whether the contract fixes the gross or the net?

The company and its adviser should decide before signing, because the choice changes the contract cost by the proportion in Table 2. A net clause with no reference rate leaves open a cost that depends on how the payment is characterized. Fixing the gross avoids the extra cost in Table 2; the contract should state who bears the tax.

Tax treaties and the certificate of residence: how to claim relief at the source

A tax treaty reduces or removes the withholding only if the recipient proves residence in the other country and meets the treaty's own provisions. Article 4 of the LISR sets this and adds procedural conditions, including filing information on its tax situation under article 32-H of the CFF and appointing a legal representative.

The LISR lets the withholding agent apply the treaty rate directly when it is lower than the statutory rate. If the agent applies a higher rate, the foreign resident may request a refund of the difference. The first route is preferable: it spares the vendor a refund procedure that can strain the commercial relationship.

Residence certificates issued by foreign authorities take effect without legalization. An authorized translation is required only when the tax authorities ask for it. In related-party transactions the authorities may also request a sworn statement, signed by the legal representative, showing juridical double taxation.

For a new vendor file, request the following before the first payment:

• The vendor's tax residence certificate, valid for the year of payment.
• The identity of the beneficial owner of the income.
• The contract describing the service or right, with its tax characterization.
• A signed note from your adviser on the treaty article being applied.

To see how a treaty is read, the Colombian case is in our guide to the Colombia double taxation treaty. If the vendor is a United States contractor, the W-8BEN form covers the opposite relationship, a Latin American contractor billing a United States client.

Remitting the withholding, the withholding invoice and deducting the payment

The withholding is remitted by a return filed with the authorized offices, and the tax is final for the foreign resident. Article 153 of the LISR sets that final character; the filing deadline and form must be confirmed with your adviser and the SAT's general rules, which this article does not detail.

Two documentary duties accompany the withholding. The first is in article 76, section III: the payer must issue tax receipts stating the amount of payments that are Mexican-source income under Title V and, where applicable, the tax withheld from the foreign resident. The second concerns the deduction.

Article 27, section V, of the LISR conditions the deduction: the taxpayer must comply with withholding and remittance duties for taxes owed by third parties and, for payments abroad, may deduct them only if it provides the information required under article 76. Skipping the withholding can put the expense at risk on top of the unwithheld tax charge.

Where a vendor's own staff work in Mexico, another control applies before payment: our guide to REPSE and specialized services explains it. For documenting a foreign collection from the Mexican side, the Mexican CFDI invoice explained for foreign companies completes the picture.

What Soulbit V1 delivers on withholding tax, and what it does not

Soulbit V1 does not calculate, withhold or remit income tax on any payment, and it does not decide whether income has a Mexican source. That work stays with your accounting team and tax adviser.

What Soulbit V1 does today is apply KYB to the companies using the platform, apply AML controls and transaction monitoring, operate with institutional custody and pay foreign vendors in USDC and USDT stablecoins. Each payment leaves a traceability record your team can file with the vendor's documents, and support is human.

What Soulbit V1 does not deliver: it does not issue CFDI or withholding receipts, does not integrate with your ERP, does not automatically convert to pesos or any currency and has no local bank rail in Mexico; its only local bank rail is in Colombia. Paying in stablecoins does not change whether income has a Mexican source or the duty to withhold, and its tax treatment should be reviewed with your adviser.