What amortization method does this calculator use?

It uses the French method (prestacoes constantes), the standard fixed-installment approach Portuguese banks use for credito habitacao. The monthly payment stays the same for the whole term, but the mix shifts over time: more of each early payment covers interest, and more of each later payment covers principal.

Why does the calculator ask for Euribor and spread separately?

Most Portuguese mortgages are variable-rate, priced as an Euribor index (commonly the 3-month or 6-month rate) plus a fixed spread (margem) set by the bank. Entering them separately mirrors how your loan contract is actually structured and makes it easy to test what happens if only Euribor moves at your next review date.

Is this the TAN or the TAEG?

This calculator computes the payment from the TAN (annual nominal rate, Euribor plus spread). The TAEG (APRC) that banks must disclose also folds in fees, mandatory insurance, and other charges, so the real cost is usually a bit higher than the TAN-only payment shown here.

Does this include IMT or Imposto do Selo?

No. Buying property in Portugal also involves IMT (property transfer tax), Imposto do Selo (stamp duty on the deed and on the loan itself), notary, and registration fees. Those costs are paid separately at signing and are not part of the loan this calculator amortizes.

What loan term is typical for a Portuguese mortgage?

Terms of 30 to 35 years are common, and some banks extend up to 40 years for younger borrowers. Lenders generally require the loan to be paid off by a set borrower age, often around 75 to 80, which shortens the maximum term available to older applicants.

Why does the interest portion of the payment shrink over time?

Interest is charged each month on the remaining balance. As principal gets paid down, the balance shrinks, so the interest charged each month shrinks with it. Since the total monthly payment is fixed, the freed-up amount goes toward paying off more principal, which is why the year-by-year schedule shows principal paid rising and interest paid falling.

Portugal Mortgage Calculator

Name: Portugal Mortgage Calculator
Availability: InStock
Author: Nham Vu

Enter the loan amount, Euribor rate, spread, and term to get your Portugal mortgage (credito habitacao) monthly payment, total interest, and a year-by-year amortization schedule.

Loan Details

Loan Amount (capital em divida)

€

Euribor Rate

Spread (margem)

Loan Term

Annual rate used = Euribor + spread. Most Portuguese mortgages are variable, so the real payment changes when Euribor resets at your review date.

Enter a loan amount to see your credito habitacao breakdown.

Monthly Payment

€0.00

at 0.00% (Euribor + spread), fixed for the full term

Loan Amount

€0.00

Total Interest

€0.00

Total Repaid

€0.00

Detail	Value
Annual rate (Euribor + spread)	—
Monthly payment	—
Number of payments	—
Total interest over the term	—

Year-by-Year Amortization Schedule

Year	Principal Paid	Interest Paid	Remaining Balance

Summary

Enter the loan amount, Euribor rate, spread, and term to get your Portugal mortgage (credito habitacao) monthly payment, total interest, and a year-by-year amortization schedule.

How it works

Enter the total loan amount (capital em divida) you plan to borrow, in euros.
Enter the current Euribor rate (3, 6, or 12-month index, depending on your contract) as a percentage.
Enter the spread (margem) your bank adds on top of Euribor.
Choose the loan term in years.
The calculator adds Euribor plus spread to get the annual rate, then applies the French amortization method to produce one fixed monthly payment for the full term.
Read the monthly payment, total interest, and total amount repaid, then scroll the year-by-year schedule to see how the principal and interest split shifts as the balance declines.

Use cases

Estimating the monthly payment before applying for credito habitacao.
Testing how a Euribor rise or fall at the next review date changes the payment.
Comparing spreads quoted by different banks on the same loan amount and term.
Seeing how extending the term from 30 to 40 years lowers the monthly payment but raises total interest paid.
Checking how much of the first year of payments goes to principal versus interest.
Tracking the remaining balance year by year ahead of a planned partial early repayment (amortizacao antecipada).
Budgeting the loan payment separately from IMT and Imposto do Selo, which are not financed into most loans.

Frequently Asked Questions

Last updated: 2026-07-21 · Reviewed by Nham Vu