Tesouro IPCA+: how it works, returns, risks and whether it's worth it

Tesouro IPCA+ is a Brazilian government bond that pays the variation of the IPCA (Brazil's official inflation index) plus a real interest rate locked in at the time of purchase. In practice, it is the most accessible instrument for protecting the purchasing power of your money in long-term goals such as retirement, buying a home, or funding your children's education. In this guide, you'll understand how it works, what it costs, how it's taxed, what the real risks are — including mark-to-market pricing — and in which situations it makes sense in a portfolio.

Important: this content is educational and does not constitute individual investment advice.

What is Tesouro IPCA+

Tesouro IPCA+ (also known by the code NTN-B Principal) is a bond from Tesouro Direto — Brazil's retail platform for government bonds — whose return is made up of two parts:

1. IPCA: Brazil's official inflation index, which adjusts the invested amount to preserve purchasing power;
2. Fixed real interest rate: a percentage agreed at the time of purchase, representing the gain above inflation.

If you buy a Tesouro IPCA+ paying IPCA + 6% per year, for example, the National Treasury's commitment is to return the amount adjusted by inflation over the period plus 6% per year — provided you hold the bond until maturity.

This is different from Tesouro Selic, which tracks Brazil's benchmark interest rate, and Tesouro Prefixado, which locks in a nominal rate with no inflation protection. If you're still comparing the three options, the guide on CDB, Tesouro Selic or savings accounts and the complete guide to fixed income help you build that picture.

How it works in practice

The mechanics are simple to describe, but there are details that change the investor's experience:

• Purchase: you buy the bond at the day's price, which already embeds the real rate offered at that moment.
• Accrual: the value is adjusted daily by the accumulated IPCA plus interest at the contracted rate.
• Maturity: at the final date, you receive the amount adjusted by inflation plus real interest, with no surprises.
• Early sale: if you need the money before then, the National Treasury buys the bond back at the market price of the day — and this is where the product's main risk lives.

Semiannual interest: IPCA+ and IPCA+ with semiannual coupons

There are two versions of the bond:

• Tesouro IPCA+: pays everything at maturity (principal + accumulated interest);
• Tesouro IPCA+ with semiannual interest: pays interest coupons every six months and the principal at maturity.

The coupon version may appeal to those seeking periodic income adjusted for inflation, but it requires attention: each coupon received is taxed and must be manually reinvested if the goal is accumulation.

Costs: B3 custody fee

Every Tesouro Direto bond pays a custody fee to B3 (the Brazilian stock exchange) of 0.20% per year, provisioned daily on the market value of the position starting on D+1 after purchase. The charge happens on early sale, at maturity, or on interest payments.

A detail that causes confusion: the custody fee exemption for balances up to R$ 10,000 (Brazilian reais) per CPF (Brazilian taxpayer ID) applies only to Tesouro Selic. On Tesouro IPCA+, the fee applies to the entire balance, regardless of the amount. Over long horizons, 0.20% per year is a low cost, but it exists and should be included when comparing with other fixed income products.

Taxation: regressive income tax and IOF

Income tax follows the standard regressive table for fixed income in Brazil, applied to the gain:

Redemptions within less than 30 days are also subject to IOF (a short-term financial transactions tax), charged on a decreasing scale according to the number of days elapsed. Income tax applies even to the semiannual coupons, when they exist. To go deeper, see the article on the regressive income tax table for fixed income and how to declare investments on your 2026 income tax return.

The risk many people discover too late: mark-to-market

Tesouro IPCA+ protects against inflation at maturity — not at any date. Before maturity, the bond's price fluctuates daily with market interest rates (mark-to-market pricing). If rates rise after your purchase, the market price of your bond tends to fall.

This means an early sale can result in a return different from the contracted one, including a negative one. The loss only materializes if you sell before the term; held to maturity, you receive exactly the agreed return (IPCA + fixed rate).

On the safety side, there is a strong point: early repurchase is guaranteed by the National Treasury, which always buys the bond back at the day's market price. In other words, liquidity exists — what isn't guaranteed is the price of that liquidity. Since the issuer is the federal government, the bond does not depend on FGC coverage (Brazil's deposit guarantee fund), which doesn't even apply to government bonds.

Numerical example (explicit assumptions)

Suppose an investment of R$ 10,000 in a Tesouro IPCA+ maturing in 10 years, contracted at IPCA + 6% per year, with average inflation of 4% per year over the period and redemption at maturity:

• Inflation adjustment: R$ 10,000 × (1.04)^10 ≈ R$ 14,802
• Real interest of 6% per year on that amount: R$ 14,802 × (1.06)^10 ≈ R$ 26,510
• Gross return: about R$ 16,510
• Income tax of 15% on the return: about R$ 2,476
• Approximate net value: R$ 24,033 (before the custody fee)

This is an illustrative example with fixed assumptions — actual inflation and market rates vary, and the result is not guaranteed. The goal is to show the mechanics, not to project returns.

When Tesouro IPCA+ makes sense (and when it doesn't)

It makes sense when:

• the goal is long term (generally 5 years or more), with a defined date;
• you want inflation protection for goals like retirement or buying a home;
• you have the discipline not to redeem before maturity;
• the bond can be used as part of the long-term allocation within a diversified investment portfolio.

It doesn't make sense when:

• the money is your emergency fund — in that case, daily liquidity without volatility matters more; see how much to keep in an emergency fund;
• the horizon is short and you may need to sell along the way;
• you can't tolerate seeing your balance drop in some periods.

Common mistakes

1. Treating IPCA+ as a "guaranteed return": the guarantee applies at maturity, not to early sales.
2. Using IPCA+ as an emergency fund and getting frustrated with mark-to-market swings.
3. Ignoring the custody fee thinking the R$ 10,000 exemption applies to all bonds — it only applies to Tesouro Selic.
4. Choosing a maturity without checking the date: buying a bond that matures after your goal forces an early sale.
5. Comparing nominal rates of different products without adjusting for inflation — IPCA + 6% and 12% per year nominal are not directly comparable without an inflation assumption.

FAQ

Does Tesouro IPCA+ guarantee a gain above inflation? It guarantees the contracted real rate only if held to maturity. Early sales are subject to mark-to-market pricing and can produce a lower return, including a negative one.

Do I pay a custody fee on IPCA+? Yes. The B3 fee is 0.20% per year, provisioned daily. The exemption for balances up to R$ 10,000 applies only to Tesouro Selic.

Does Tesouro IPCA+ have FGC protection? It doesn't need it: the issuer is the National Treasury, and early repurchase is guaranteed by the federal government itself at the day's market price.

Can I lose money on Tesouro IPCA+? Only if you sell before maturity in a rising interest rate scenario. Held to maturity, the contracted return is honored.

How do I declare it on my income tax return? Tesouro bonds appear on the Assets and Rights form, at acquisition cost, and the returns are reported in the group of income subject to exclusive/definitive taxation.

Conclusion

Tesouro IPCA+ is the classic tool for turning long-term goals into plans with inflation protection: you lock in today a real gain (IPCA + fixed rate) and receive it in full if you hold the bond to maturity. The trade-off is volatility along the way — anyone who might be forced to sell early needs to understand mark-to-market pricing before investing. For long horizons and clear dates, it tends to be a core holding; for short terms and money that may be needed at any moment, alternatives with daily liquidity and lower volatility are usually more suitable. Evaluate your timeline, goal, and tolerance for swings before deciding — and, if you need a starting point, the guide on how to start investing organizes the first steps.

Educational content. Does not constitute individual investment advice.