High card spending does not trigger an automatic Mexican tax bill
Article 91 creates an annual tax-discrepancy examination. SAT must identify expenditures, compare them with reported income, notify the individual, and allow evidence explaining the source of funds.
A credit limit is financing, not income. The tax question appears when actual spending, asset purchases, bank deposits, investments, and credit-card activity exceed the income reported or required to be reported for the calendar year—and the excess cannot be traced to savings, loans, gifts, asset sales, or another documented source.
Original Fintax post on credit-card spending above reported income and Mexico's tax-discrepancy risk.
What Article 91 counts
SAT's current publication of Income Tax Law Article 91 expressly includes spending, asset acquisitions, deposits into bank or investment accounts, and credit-card expenditures. The comparison applies to individuals, including people who failed to register or file when required.
| Movement | Potential role | Evidence bridge |
|---|---|---|
| Card purchase | Expenditure | Card statement, receipt, and funding source |
| Card payment | Must be reconciled to avoid duplicate counting | Purchase-to-statement-to-payment map |
| Deposit into own account |
Example: MXN 420,000 in card charges versus MXN 300,000 reported
The MXN 120,000 difference is a starting signal, not yet omitted income. Assume MXN 70,000 came from accumulated prior-year savings, MXN 30,000 from a bank loan, and MXN 20,000 from a relative who used the card and reimbursed the holder. Each source requires a different contemporaneous file.
| Claimed source | Weak explanation | Defensible file |
|---|---|---|
| Prior savings | Cash was kept at home | Historical statements and balance continuity |
| Bank loan | One incoming transfer | Agreement, disbursement, schedule, and repayments |
| Relative's reimbursement |
Do not count the purchase and its card payment twice
A preventive reconciliation links each charge to the statement and settlement. The payment still needs a traceable source, but it should not be treated as a second unrelated consumption event.
The statutory procedure
- SAT determines detected expenditures using its records, third-party data, or information from another authority.
- It notifies the taxpayer of the amount, information used, source of that information, and resulting discrepancy.
- The individual has 20 days from the day after notice to explain the source of funds in writing and offer evidence.
- SAT may request additional information once under the procedure.
- Any unexplained amount may be presumed taxable income and assessed using the annual individual tariff.
Income, loans, gifts, and savings are different files
The comparison uses income reported or required to be reported, not only salary deposited into one account. Article 91 also connects to Article 90 of the current Income Tax Law for loans and gifts that were not declared or reported as required. A non-taxable source can still carry an information obligation.
Letting someone else use the card
The financial record remains under the cardholder's contract even if a family member receives the goods. A reimbursement can explain the source, but only when it maps to the precise purchase. Cash repayments and fragmented third-party deposits make the chain harder to establish.
- Retain the receipt or CFDI and the matching card charge.
- Identify who received the goods or service.
- Prefer a traceable reimbursement before the card settlement.
- Avoid using the card as a recurring financing facility for third parties.
- Do not claim another person's purchase as the cardholder's deduction.
Twelve-month preventive file
| Schedule | Scope | Reconciliation |
|---|---|---|
| Income | Salary, business, interest, rent, sales, other | Returns, CFDI, and withholding records |
| Cards | Charges, refunds, settlements, balances | Monthly statements |
| Banks |
Remove duplicates and distinguish consumption from investment. A card payment does not explain its own economic source, an internal transfer does not create wealth, a refund reduces expenditure, and a cash advance needs a destination trail.
If SAT has already opened a review
Preserve original records and verify the notice before responding. SAT describes the right to correct a Mexican tax position during examination, but correction and evidentiary clarification are different decisions. Build a dated narrative that connects each expenditure to its source before choosing either route.
Frequently asked questions
Does SAT tax the credit-card limit?
No. The limit is available credit. Article 91 addresses actual annual expenditures and whether their funding is explained relative to reported income.
Are transfers between my accounts income?
Article 91 provides an exclusion for proven transfers between the taxpayer's own accounts and specified close-family accounts. Keep both sides of the bank trail.
Does a family reimbursement solve the issue?
It can explain a specific purchase when the recipient, charge, reimbursement, and card payment reconcile. A generic cash deposit is much weaker.
When does the 20-day period start?
It begins on the day after formal notice of the discrepancy office. It is not a general grace period following every large purchase.
Official sources
Use SAT's publication of Article 91 and the full Income Tax Law. Transaction-level evidence matters more than broad social-media warnings.
