Simulate vehicle financing with IOF and effective annual rate.
Auto loans in Brazil (CDC, Crédito Direto ao Consumidor) use the PRICE amortization system with fixed monthly installments. The financed amount is the vehicle price minus the down payment, and the vehicle serves as collateral (alienação fiduciária). The effective annual rate is derived from the monthly rate by compound capitalization, and the total cost also includes IOF, which varies with the term. IOF is charged as 0.0041% per day on the financed amount (capped at 365 days) plus a fixed 0.38% on the principal. A higher down payment reduces the financed amount, the interest and the IOF, and this tool shows the full cost breakdown.
The financed amount is the vehicle price minus the down payment. On that amount the tool builds a PRICE schedule with a fixed installment: early on, most of the installment is interest on a still-high balance; over time, the amortization share grows and the balance falls. The monthly rate you enter is converted into an effective annual rate by compound capitalization, so you can compare it with offers quoted per year.
IOF is added on top: 0.0041% per day on the financed amount, capped at 365 days, plus a fixed 0.38% on the principal. Because the daily part is capped at one year, IOF grows with the term up to that ceiling and then levels off, and it is shown separately so you can see how much this tax weighs on the total cost.
Illustrative example, a R$ 50,000 vehicle with a R$ 10,000 down payment: the financed amount is R$ 40,000. The fixed IOF component is 0.38% of that, about R$ 152, and the daily part (0.0041% per day, capped at 365 days) is roughly R$ 599 for a term above one year, adding up to about R$ 751 of estimated IOF (illustrative values).
On the R$ 40,000, the monthly installment is computed with the PRICE table according to the chosen rate and term. Increasing the down payment lowers the financed amount and, with it, both total interest and IOF, so it is worth simulating different down payments before closing the deal.
The rate depends on your credit profile, verifiable income, the size of the down payment and the vehicle's age, used cars usually carry higher rates than brand-new ones. Under CDC, the vehicle itself is held as collateral (alienação fiduciária), and you may settle the loan early with a proportional reduction of future interest.
This is an educational simulation: the vehicle insurance and some contract fees are not included in the installment. For the real, comparable cost, ask the bank for the CET (Total Effective Cost) of the offer, which bundles interest, IOF, fees and required insurance into a single rate.
Paste the code into your HTML and the tool shows up on your page, without J-Kit's navigation and ads. It still runs in the browser of whoever visits your site.
<iframe
src="https://jkit.tools/embed/en-US/auto-loan-calculator"
width="100%"
height="600"
style="border:0"
loading="lazy"
title="Auto Loan Calculator (Brazil)"
></iframe>These references help contextualize formulas, standards, APIs and limitations used on this page. They do not replace professional validation when a result has legal, financial, medical or operational impact.
In 2024-2025, rates ranged from around 0.89% to over 2.5% per month for auto loans, depending on the bank, the vehicle year and the customer's credit profile. Used vehicles generally attract higher rates because their value is harder to predict. A larger down payment and a strong credit history can push the rate toward the lower end of that range.
⚠️ Educational simulation. Final rate depends on vehicle year, model, bank and credit profile.
PRICE system. IOF: Decreto 6.306/2007.
Outstanding balance
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