TUNTON Private credit · Monterrey
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Total cost and approximate CAT

Work out the real cost of a loan with whatever data you have: the rate, or just the monthly payment, with fixed payments or interest-only. Get the approximate CAT (Costo Anual Total, Mexico's all-in APR) to compare offers.

Deducted when the loan is disbursed. Enter 0 if none.
Approximate CAT
—
Estimated CAT, excluding IVA (Mexico's VAT)
Annual rate (nominal)—
Monthly payment—
Final payment—
Total interest—
Origination fee—
Total to repay—
Total cost of the loan—

Assumptions & method

  • The CAT here is an approximate estimate, not the official CAT. Methodology: the monthly internal rate of return that equates the net amount disbursed (amount − fee) with the stream of payments, annualized as (1+i)¹²−1.
  • If you only know the monthly payment, the calculator infers the implicit rate: for fixed payments, by solving the annuity formula; for interest-only, monthly rate = payment ÷ amount.
  • Includes interest and the origination fee. Does not include IVA, insurance, or other charges that the official Banxico CAT does take into account.
  • Use it to compare offers against each other; for the official CAT, refer to the one your lender is required by law to provide.
Estimated CAT · not the official CAT
Frequently asked questions

The essentials, in brief

What is the CAT?
The CAT (Costo Anual Total) is a percentage measure that summarizes, in a single annual figure, the cost of a loan: interest plus fees and other charges. It lets you compare different loans on equal terms.
I only know how much I pay each month — can I still use this calculator?
Yes. Choose “I know the monthly payment” and enter the amount, term, and payment: the calculator infers the implicit rate you are paying and the approximate CAT. It is useful for uncovering the real cost of a loan you already have.
Why do you say it is 'approximate'?
Because the official CAT follows a precise Banxico methodology that includes all charges (insurance, appraisals, IVA where applicable) with their exact dates. Here we estimate using interest and the origination fee: enough to compare, but no substitute for the CAT your lender must provide you.
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