RESICO is Mexico's Simplified Trust Regime. In accounting terms, it does not mean "no accounting." It means a lighter but highly organized control of collected income, CFDI, withholdings, VAT and monthly filings.
For individuals, RESICO is designed for business activities, professional services, leasing and other eligible cases, as long as prior-year income does not exceed MXN 3.5 million. The core rule in Article 113-E of the Mexican Income Tax Law, published by SAT, is that monthly ISR is calculated on income actually collected, with no deductions. That simplicity is attractive, but it demands discipline: if invoices, bank deposits and returns do not tell the same story, the benefit becomes fragile.
What changes in day-to-day accounting
Under RESICO, the monthly close matters more than last-minute corrections. SAT may pre-fill part of the return with CFDI data, but the taxpayer remains responsible for confirming that the income was actually collected, that withholdings are correct and that VAT is not being carried with errors.
The useful question is not "Does RESICO require accounting?" It is "Can I prove each amount collected and each tax filed?" If the answer depends on emails, screenshots or memory, the regime is already becoming risky.
Requirements to review before entering
Before choosing or staying in RESICO, review these points with real numbers:
- Prior-year income and current-year projection.
- Tax regime shown in the tax status certificate.
- Participation in companies, co-ownerships or incompatible activities.
- Clients that withhold ISR or VAT.
- CFDI issued, canceled and pending payment complements.
The MXN 3.5 million threshold should not be checked only at year-end. It needs monitoring during the year. If the business grows, if income sources are mixed or if a co-ownership is involved, RESICO may stop being convenient earlier than expected.
Real benefits, without overselling it
RESICO can be very efficient when a taxpayer has few deductible expenses and relatively stable collections. ISR rates for individuals are low compared with other regimes, and the monthly calculation avoids relying on deductions that are hard to document.
But the benefit is not universal. Someone with office rent, payroll, expensive equipment or high operating costs may pay less under another regime because deductions are allowed there. Before migrating, compare at least two scenarios: RESICO versus the general or business activity regime. At Fintax, that comparison is based on the client's numbers, not only on generic tables.
Obligations that do not disappear
RESICO simplifies ISR, but it does not eliminate the rest of the tax work. CFDI, VAT, withholdings, monthly payments and supporting documentation still matter.
SAT explains in its monthly and definitive RESICO filing service that ISR and VAT are generally filed by the 17th day of the following month. It also notes that the return is pre-filled with tax receipts issued and received. That pre-fill helps, but it does not replace reconciliation.
CFDI and cash flow
The basis for RESICO is income actually collected. If an invoice is issued in March but paid in April, the movement must be documented correctly. Problems appear when the CFDI says one thing, the bank says another and the return says a third.
Each monthly close should answer three questions:
- Which issued CFDI were actually collected.
- Which CFDI are still pending collection or payment complement.
- Which withholdings were made by the client and how they appear in the return.
VAT and withholdings
VAT does not become optional because a taxpayer is in RESICO. If services are provided to a legal entity, withholdings may apply; if transactions include VAT, VAT charged, creditable and withheld must be reviewed. The common mistake is focusing on the low ISR rate while ignoring VAT flow.
When a withholding is not properly stamped, the portal may not recognize it. If the taxpayer misses that detail, the result can be an overpayment or a difference that later requires clarification.
Risks of leaving the regime
SAT may remove a taxpayer from RESICO for relevant noncompliance, including omitted monthly payments or failure to meet essential obligations. Article 113-I is a key reference for understanding the consequences of losing the regime.
Leaving RESICO is not just a label change in the RFC. It may require recalculating taxes under another regime, correcting returns, explaining differences and absorbing surcharges or penalties. Watch these risk signals:
- Income growing close to the annual limit.
- Months with no filed return.
- Canceled CFDI without follow-up.
- Legal-entity clients with incorrect withholdings.
- Business and personal bank movements mixed together.
When accounting support is worth it
If income is low, clients are few and collections are easy to trace, RESICO can be managed with a disciplined monthly routine. But when there are multiple payers, partial payments, withholdings, mixed income or fast growth, the cost of a mistake rises.
An accountant should do more than file returns. They should help decide whether RESICO still makes sense, detect differences between CFDI and bank records, and leave support before a SAT notice arrives. That is the value of a remote service like Fintax: turning monthly compliance into a process, not an emergency.
Frequently asked questions
What is RESICO in accounting?
It is a simplified Mexican tax regime where ISR for individuals is calculated on income actually collected. It reduces administrative burden, but still requires monthly control of CFDI, bank records, VAT, withholdings and returns.
Does RESICO require electronic accounting?
It depends on the taxpayer type and registered obligations. Individuals in RESICO usually have a lighter burden than taxpayers in the general regime, but they still need support records, income controls and proof of transactions.
When does RESICO stop being convenient?
It may stop being convenient when deductible expenses are high, income is irregular, activities are mixed or the income limit may be exceeded. The right step is to simulate RESICO against another regime before deciding.
What should be reviewed every month?
Review issued CFDI, real collections, withholdings, VAT, payment complements, prior returns and acknowledgments. The goal is for bank records, invoices and filings to match before submitting.
