Someone earning in euros sends me a screenshot of Brazil’s headline interest rate every few months with the same three words attached: “is this real?”
Part of it is. Most of it is not yours to keep. Between the number on the screen and the money in your hand sit three deductions, and the third one is the only one that decides whether the whole exercise made sense.
I am not going to tell you what the Selic rate is today, because it changes and because a number in an article is a number out of date. Look it up on the Banco Central site before you use any of this, take inflation from the official IPCA series, and then run the arithmetic below with your figures instead of my example ones.
The worked example uses a nominal 12% a year, inflation of 5% a year, and R$50,000 invested. All three are invented for the demonstration.
Deduction one: inflation, which is not subtraction
R$50,000 at an example 12% gives R$56,000 after a year. With example inflation of 5%, you needed R$52,500 just to buy what R$50,000 bought before.
So the real gain is R$3,500 in end-of-year money. The real rate is not 12 minus 5: it is 1.12 ÷ 1.05 − 1, which is 6.67%. Close to seven at these levels, and the gap between the two methods widens as the numbers get bigger.
That 6.67% is the honest headline — what your purchasing power inside Brazil actually grew by, before anyone taxed it.
Deduction two: the tax lands on the nominal gain
Brazilian fixed income carries a regressive income-tax table: the band on your gain steps down the longer you hold, with the steps falling at roughly six months, one year and two years. That structure is the mechanism, and it is worth knowing before you pick a maturity. Check the bands in force rather than trusting any figure you read, including mine — the example below uses 17.5%.
Now the detail that catches almost everyone. The band applies to the whole nominal gain, not to the real one.
Your nominal gain was R$6,000. At the example band, tax is R$1,050, leaving R$4,950 and a balance of R$54,950. But your real gain was only R$3,500, so the tax was 30% of what you actually gained — from a band that reads 17.5% on paper. Inflation is inside the taxable base.
| Step (all example figures) | Amount, in next year’s reais | Rate on R$50,000 |
|---|---|---|
| Nominal gross return (example 12%) | R$6,000, giving R$56,000 | 12.00% |
| Balance needed just to stand still (example 5% inflation) | R$52,500 | — |
| Surplus over standing still, before tax | R$3,500 | real 6.67% |
| Income tax (example band 17.5% of the R$6,000 gain) | −R$1,050 | — |
| Net nominal return | R$4,950, giving R$54,950 | 9.90% |
| Surplus over standing still, after tax | R$2,450 | — |
| Real return after tax, in today’s money | R$2,333 | 4.67% |
The last two rows are the same money measured twice: R$2,450 of next year’s reais divided by 1.05 is R$2,333 of today’s, and R$2,333 on R$50,000 is the 4.67%. Always deflate before you compare.
So twelve percent became 4.67%. Roughly three-fifths of the headline went to inflation and tax before the currency said a word — and 4.67% real is a decent return, just not an extraordinary one.
One mechanism worth naming here: an inflation-linked bond pays a fixed spread on top of the inflation index, so it defends purchasing power by construction rather than by luck. That is a description, not a recommendation, and nothing in this article is personalized investment advice — what suits you depends on facts an article cannot know.
Deduction three: the currency, which decides it
Here is where the screenshot stops being interesting. If you brought dollars in and intend to take dollars out, your return is the net nominal one, translated twice.
US$10,000 in at an example R$5.00 is R$50,000. A year later you hold R$54,950. What that is worth depends entirely on a rate nobody can tell you in advance.
| Example rate after one year | R$54,950 converts to | Return on US$10,000 |
|---|---|---|
| R$4.60 (real stronger) | US$11,945 | +19.5% |
| R$5.00 (unchanged) | US$10,990 | +9.9% |
| R$5.495 (breakeven) | US$10,000 | 0.0% |
| R$6.00 (real weaker) | US$9,158 | −8.4% |
The breakeven line is the one to memorize, and you can compute it in one step: starting rate × (1 + net nominal return), so 5.00 × 1.099 = R$5.495.
Which gives a rule that travels with any figures you plug in. Your entire cushion against the currency equals your net nominal return, not the headline rate — here, a real that weakens by more than about 9.9% wipes out the full year.
Note also that the 4.67% real return and the +9.9% dollar return describe the same money. They are answers to two different questions, and confusing them is how people end up disappointed by a year that went exactly as planned.
Which question you are actually asking
So the arithmetic reduces to one thing: what is the money for? Not a forecast — a purpose.
- Money that will be spent in reais. Your mother’s condo fee, a property tax bill, your own costs when you return. The right column is the 4.67% real return, and the currency table is irrelevant to you because you are never converting back. Reais against reais obligations is a natural hedge, not a bet.
- Money that will be spent in your earning currency. The currency table is now the whole story, the interest is a 9.9% cushion, and you are taking currency risk to earn it. That is a position, whether or not you think of it as one.
- Money you have not assigned. Assign it before you invest it. An unassigned balance defaults to the second case without anyone deciding.
This is what I see in almost every statement I open from someone living abroad: reais bought for a purpose in reais, then judged by a dollar yardstick, and vice versa. Pick the yardstick when you buy, not when you look. The fuller version of that reasoning is in how currency risk works when you earn in dollars.
Before you run this with live numbers
Four figures, and none of them are in this article on purpose: the current Selic rate and the current inflation reading, both official and both free to look up; the tax band that matches the holding period you have in mind; and the rate you would actually be quoted, not the reference rate.
Then two practical limits. All of this runs through a Brazilian brokerage account, and buying Tesouro Direto while living outside Brazil turns more on account and document status than on the bonds themselves. A rate you cannot access is not a rate.
And the comparison you are really making is against what your money earns where you live, which needs the same three deductions applied to both sides — worked through in a CDB against a US savings account, compared honestly. A CDB is a certificate of deposit issued by a Brazilian bank, and the headline rates of two instruments in two currencies are not comparable numbers.
What you owe or must declare on any of it is a question for a contador, a Brazilian accountant, and not one I will answer here. Do the three deductions first, though — most of the excitement about Brazilian rates does not survive them. The rest of the decisions around earning abroad are mapped in the guide to earning abroad with money in Brazil.