Calculadora de Financiamento pela Caixa
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
SAC: amort = P/n; PRICE: PMT = P·r·(1+r)ⁿ/((1+r)ⁿ−1)
About this calculator
This calculator simulates housing loans from Caixa Econômica Federal using SAC and PRICE amortization systems. It calculates the installment amount, total interest paid, and outstanding balance over time, considering property value, down payment, term, and interest rate. SAC is more common in Brazil, with constant amortization and decreasing installments, while PRICE has fixed installments.
The calculation follows standard market formulas. In SAC, monthly amortization is the financed amount divided by the number of installments, and interest is applied to the remaining balance. In PRICE, the installment is computed using the formula PMT = P * r * (1+r)^n / ((1+r)^n - 1), where P is the financed amount, r the monthly rate, and n the number of installments. The tool shows the monthly balance evolution and total interest.
Use this calculator to plan a property purchase financed by Caixa. For example, simulating a R$ 300,000 apartment with a 20% down payment and a 30-year term, you can compare total interest between SAC and PRICE. It helps decide which system to choose or adjust the down payment to reduce costs.
Caution: the interest rate entered must be the effective annual or monthly rate as disclosed by Caixa. The calculation does not include mandatory insurance (MIP, DFI) or administrative fees. The result is approximate; consult Caixa for an official simulation. Additionally, SAC initial installments are higher, which may impact your budget in the early years.
Frequently asked questions
What is the difference between SAC and PRICE?
In SAC, installments decrease over time with constant amortization. In PRICE, installments are fixed, but amortization increases over time. SAC usually results in less total interest, but higher initial installments.
Should the interest rate be annual or monthly?
Use the effective annual rate (e.g., 8% per year) or monthly (equivalent). The calculator converts automatically if you enter the annual rate. Check Caixa for the current rate.
Does the calculation include insurance and fees?
No. The result considers only interest and amortization. Mandatory insurance (MIP, DFI) and Caixa's administrative fees must be added to the actual installment.
Can I use it for a used property?
Yes, the calculator works for new or used properties financed by Caixa, as long as conditions (rate, term) are the same.
What does outstanding balance mean?
It is the amount still owed after each installment. In SAC, it decreases linearly; in PRICE, it decreases more slowly at the beginning.