How it works
What this calculadora actually does
The Fixed Income calculadora (Brasil) works out your fixed income calculadora brasil in seconds, using the 2026 figures most UK households actually check against.
Most Finance tools bury the calculation. Fixed Income calculadora (Brasil) shows it. Punch in your figures, read the working, share the URL if you need a second opinion.
Small rate differences stack up over years — always run the maths before signing. Pull last month’s statement open on another tab — then run the sums and the rest of this page explains what the answer means.
Compare CDB, LCI, LCA, Tesouro and poupança side by side with the same amount, period and the correct regressive IR table.
On this page you will see LCI, LCA and Tabela regressiva treated as first-class terms — each one is linked to the calculators and references that use it, so you can follow the thread without retyping queries into a search bar.
If it helps, jump straight to the Finance hub or compare with the Poupança vs CDB calculadora and the Tesouro SELIC calculadora — those two calcs are the ones readers usually open right after this page.
Following the method end to end
Here's what happens when you plug real numbers in.
Compare CDB, LCI, LCA, Tesouro and poupança side by side with the same amount, period and the correct regressive IR table.
Moments this tool earns its keep
Fixed Income calculadora (Brasil) is aimed at people arriving with questions like these:
- "Comparar CDB LCI LCA"
- "Melhor renda fixa hoje"
- "IR renda fixa"
- "What is fixed income brasil"
- "How to calculate fixed income brasil"
- "Fixed income brasil formula"
Where the number stops being useful
Every tool has an edge where it stops being the right answer. Fixed Income calculadora (Brasil) is no exception:
- For legally binding tax or medical decisions — cross-check with HMRC, NHS or a qualified professional.
- For very large or very small extremes the rounding error outgrows the useful precision.
- When the underlying rate or threshold has changed since the page was last reviewed — always verify with the primary source.
- When the input you have is already a derived figure (net of something) — feeding it in as "gross" will double-subtract.
The snags that cost people the answer
Every time you run the sums for a new scenario, one of these creeps in — it's worth knowing them ahead of time.
- Misreading the unit in the label — 'per year', 'per month' and 'per day' versions of the same figure differ by 12× or 365×.
- Taking a ratio and multiplying it by the wrong side of the inputs — always write the ratio as A/B with labels before running.
- Trusting a screenshot of someone else’s calculation — rerun it yourself with the same inputs, numbers drift.
- Assuming percentages add up. 10% off then 10% more is not the original price — it is 99% of it.
- Not refreshing the page when thresholds are date-sensitive. If the page was cached yesterday, bank rates may already be yesterday’s.
The sources behind the numbers
Where the maths needs an external authority, we cross-check against:
- B3
- Tesouro Nacional
- Receita Federal
Works well alongside
If this question keeps coming up for you, the same cluster of tools usually comes next:
- Poupança vs CDB calculadora — Compare Brazilian poupança savings (tax-free but lower rate) against CDB (subject to IR) on the same maturity and amount.
- Tesouro SELIC calculadora — Project returns on Brazilian Tesouro SELIC (LFT) with daily marked-to-market yield, custody fee and IR regressive table.
- Tesouro IPCA+ calculadora — Project returns on Tesouro IPCA+ (NTN-B) — real yield plus inflation (IPCA), IR regressive table and reinvestment.
- CDI calculadora — Brazilian CDI-indexed investments — apply percentage-of-CDI (e.g. 110% CDI) returns and net-of-IR tax.
How we keep this accurate
Our calculadoras run on pure, unit-tested functions — the same logic lives in the browser and in the CI test suite. When tax rates, thresholds or official figures move, the update lands within 24 hours of the announcement. You can read the editorial policy and corrections policy.
Found an out-of-date number on Fixed Income calculadora (Brasil) or anywhere else in the Finance toolkit? Send it to the editorial desk and we'll patch it. Or browse the full calculadora directory for the next tool you need.