TUNTON Private credit · Monterrey
ESEN
Contact
ESEN
Tool

CETES calculator

Calculate what an investment in CETES (Mexican Treasury bills) leaves you with at the term you choose, net of the provisional ISR (income tax) withholding in effect for 2026.

Editable example; check the current rate at cetesdirecto or Banxico.
What you receive at maturity
—
Principal + yield, net of withholding
Gross yield—
Withholding (0.90% annual on principal)—
Net yield—
Annualized net rate—

Assumptions & method

  • Gross yield = amount × annual rate × days ÷ 360 (simple interest, CETES convention).
  • Withholding: 0.90% annual on principal, prorated for the term, under Art. 24 of the Ley de Ingresos de la Federación 2026 (Federal Revenue Law, DOF 7-nov-2025). It is a provisional ISR payment, not the final tax.
  • The final ISR is calculated in your annual tax return, on the real interest (the amount that exceeds inflation); the withholding is credited against it.
  • The CETES rate is an editable example: check the current rate at cetesdirecto.com or Banxico before deciding. It is not an investment recommendation.
LIF 2026 art. 24 withholding (0.90%) · verified in DOF
FAQ

The essentials, in brief

Are CETES safe?
They are the lowest-risk instrument in pesos: Federal Government debt. The trade-off is that they yield less than riskier alternatives, and their real return depends on inflation over the period.
What exactly is the 0.90% withholding?
A provisional ISR payment that the institution withholds automatically, calculated on your principal (not on the yield), at the annual rate set each year by the Revenue Law: 0.90% for 2026. On your annual tax return it is reconciled against the actual tax.
Is a longer or a shorter term better?
The short term (28 days) gives you flexibility and frequent reinvestment; the long term locks in the rate for longer. If you expect rates to fall, the long term protects you; if you expect them to rise, the short term lets you reinvest at better rates.
Next step

Tell us about your deal

Tell us how much you need and what collateral you can offer. We'll tell you frankly whether it's viable and how we'd structure it.

Request via WhatsApp →