Compare SAC and Price amortization systems — see the first and last installment, total interest and total paid for any loan amount and rate.
SAC and Price are the two amortization systems used in Brazilian real estate and vehicle financing. In SAC the principal is repaid in equal parts every month, so the installment starts high and decreases as the outstanding balance shrinks and the interest portion falls. In Price the installment is fixed — the same amount every month — which means the early payments are mostly interest and the principal is repaid slowly at first, then faster toward the end.
The total interest paid is always higher in Price than in SAC for the same loan, rate and term, because the outstanding balance stays higher for longer. The trade-off is cash flow: SAC demands more money in the first years, when the borrower is often least prepared. Brazilian banks offer both and some allow switching mid-contract, though the conditions vary.
This calculator shows the first and last installment, the total interest and the total amount paid. It does not include insurance, administrative fees or the TR correction that most Brazilian mortgage contracts apply — those depend on the bank and the contract. The numbers here are the pure financial math: enough to compare the two systems and to know roughly what a loan will cost.
Price: PMT = PV × [i × (1+i)^n] / [(1+i)^n − 1]. SAC: amortization = PV / n; installment k = amortization + (PV − (k−1) × amortization) × i. Total interest = sum of all interest portions.
SAC, always — because the outstanding balance decreases faster, so less interest accrues over the life of the loan. The difference can be substantial over 30 years.
Because the fixed installment is easier to fit into a budget approval. The first SAC installment can be 30-40% higher than the Price installment for the same loan, and income requirements are based on the first installment.
No. This is the pure financial math. Brazilian mortgages add MIP (death/disability insurance), DFI (property damage insurance), an administrative fee and TR correction, all of which raise the effective installment.
No. The calculation runs entirely in JavaScript on your device.
Divide it by 12 first. A 12% annual rate is approximately 0.949% monthly (not 1%), because the rate compounds. For a rough comparison, dividing by 12 is close enough.
Vai.la turns any URL into a short link with click statistics, QR Code and your own biolink.
Vai.la is not responsible for how the tools are used or for decisions made based on their results.