Poupança, CDB, Tesouro Direto or DeFi: a real comparison

Poupança vs CDB vs Tesouro Direto vs DeFi: which actually protects your wealth

If you have money sitting in Brazil's poupança savings account, you are losing purchasing power. That is not opinion. It is arithmetic. And if you moved to CDB or Tesouro Direto thinking the problem was solved, the answer is more nuanced than it looks.

This comparison analyzes all four instruments with real 2025-2026 data. We will not repeat the generic "diversify your portfolio" pitch. We will show numbers, subtract inflation, account for the real's depreciation, and answer the question that actually matters: how much of your purchasing power survives in each scenario?

Nominal yield is vanity. Real yield, after inflation and currency depreciation, is what pays your bills.

How much does the poupança yield in 2026: the math almost nobody does right

With the Selic rate at 14.25% per year (March 2026), the poupança follows the rule in place since 2012: when the Selic exceeds 8.5%, the yield is fixed at 0.5% per month plus the Taxa Referencial (TR). In practice, this results in approximately 7.40% per year.

Sounds reasonable. Until you factor in inflation.

The IPCA (Brazil's official inflation index) accumulated over the 12 months ending February 2026 was 5.06%. That means the poupança's real return is approximately 2.2% per year. Two point two percent. For every R$10,000 invested, your actual purchasing power gain is about R$220 in a full year.

Now consider that the real has depreciated an average of 8% per year against the US dollar over the last decade. If you measure wealth in global purchasing power, the poupança does not preserve it. It erodes it slowly, with the advantage of doing so painlessly.

Poupança advantages:

• Tax-exempt for individuals
• Daily liquidity (with proportional yield loss)
• FGC guarantee up to R$250,000 per taxpayer per institution

Poupança disadvantages:

• Real yield near zero in high-inflation environments
• No currency protection
• Monthly anniversary: early withdrawal forfeits the period's yield

CDB in 2026: CDI-linked yields and the 100% trap

CDBs (Certificados de Depósito Bancário, a fixed-income deposit instrument) are the first alternative most Brazilian investors consider. In April 2026, CDBs from large institutions offer between 97% and 103% of the CDI, while smaller issuers reach 115% or more.

With the CDI tracking the Selic at 14.25%, a CDB at 100% CDI yields 14.25% gross per year. Looks strong. But income tax applies to the yield on a regressive schedule:

• Up to 180 days: 22.5%
• 181 to 360 days: 20%
• 361 to 720 days: 17.5%
• Over 720 days: 15%

For a CDB held two years at 100% CDI, the net yield is approximately 12.1% per year. Subtracting the 5% IPCA, the real yield is approximately 6.8%.

Significantly better than the poupança. But still denominated in reais.

Tesouro Direto in 2026: IPCA+, fixed-rate and Selic-linked bonds

Brazil's Tesouro Direto (Direct Treasury) offers three main categories, each with a distinct profile.

Tesouro Selic (LFT): Tracks the Selic rate with daily liquidity. In April 2026, it yields close to 14.25% gross. After income tax (regressive schedule) and the B3 custody fee of 0.20% per year, the net yield for holdings over 1 year is approximately 11.5%. Real yield: roughly 6.2%.

Tesouro IPCA+ (NTN-B Principal): Guarantees inflation plus a fixed spread. In April 2026, bonds maturing in 2035 offer IPCA + 6.8% per year. This means a guaranteed real yield of 6.8% per year if held to maturity, before income tax. After tax (15% at the minimum bracket), the net real yield is close to 5.8%.

Tesouro Prefixado (LTN): Fixed rate defined at purchase. Bonds maturing in 2029 offer roughly 14.5% per year. The risk: if future inflation exceeds expectations, the real yield shrinks. It is a directional bet.

The Tesouro Direto is, without question, superior to the poupança and competitive with CDBs. The Tesouro IPCA+ in particular solves the domestic inflation problem. But no Treasury bond solves the currency exposure. All yield is denominated in reais.

The Tesouro IPCA+ protects against Brazilian inflation. It does not protect against the erosion of the real against the dollar. Those are two distinct problems.

How DeFi yield works with dollar-pegged stablecoins

Decentralized finance (DeFi) operates through smart contracts on public blockchains. Lending protocols like Aave allow you to deposit dollar-pegged stablecoins (USDC) and receive yield generated by the lending market.

The yield comes from supply and demand dynamics. Borrowers pay interest to access liquidity. Depositors receive a share of that interest. No intermediary captures the spread. The smart contract executes the logic transparently and verifiably.

In April 2026, yield rates on established protocols for stablecoins range between:

• Aave V3 (Ethereum/Base): 4.5% to 8% APY on USDC
• Morpho (optimizer): 6% to 11% APY on USDC
• Curated vault strategies: 7% to 14% APY depending on risk profile

These yields are denominated in US dollars. That changes the equation entirely for the Brazilian investor.

Real yield comparison: R$10,000 invested for 3 years

Let us run the practical exercise. R$10,000 invested in April 2026, projected to April 2029, across four scenarios. Conservative assumptions:

• Average IPCA: 4.8% per year
• Real depreciation against USD: 7% per year (10-year historical average)
• Average Selic over the period: 13% per year
• Starting exchange rate: R$5.70/USD

Poupança (7.4% per year, tax-exempt):

• Nominal value in 3 years: R$12,388
• Real value (IPCA-adjusted): R$10,706
• Dollar purchasing power: approximately 12% reduction

CDB 100% CDI (13% gross, 15% IR after 2 years):

• Nominal value in 3 years: R$13,649 (accounting for IR on yield)
• Real value (IPCA-adjusted): R$11,794
• Dollar purchasing power: slight preservation, no material gain

Tesouro IPCA+ 6.8% (guaranteed real yield, 15% IR):

• Nominal value in 3 years: R$14,023 (IPCA + 6.8%, minus IR)
• Real value (IPCA-adjusted): R$12,117
• Dollar purchasing power: preservation with small real gain

DeFi in stablecoins (8% APY conservative, in USD):

• Initial converted value: ~USD 1,754 (at R$5.70)
• Value in 3 years: ~USD 2,210 (8% compounded)
• Converted back at R$6.98 (7% depreciation/year): R$15,425
• Real value (IPCA-adjusted): R$13,330
• Dollar purchasing power: real gain of 26%

The difference is structural. DeFi yield in dollars accumulates two vectors of appreciation: protocol yield and currency appreciation. Instruments denominated in reais need to beat both domestic inflation and currency depreciation. Few manage it.

Taxation and hidden costs: what each investment actually charges

No comparison is honest without accounting for all costs.

Poupança: Tax-exempt. No fees. No IOF after 30 days. It is the most transparent instrument in terms of costs. The problem is that the gross yield is already low.

CDB: Regressive income tax (22.5% to 15%). IOF in the first 30 days. Implicit spread: the financial institution pays you less than it receives in the interbank market. If your CDB pays 100% of CDI, the institution takes that money and lends it at 150% or more. You receive the smallest slice.

Tesouro Direto: Regressive income tax. B3 custody fee of 0.20% per year. Spread on buy and sell prices for early redemption. Mark-to-market can produce nominal losses in rising rate environments.

DeFi: No intermediary capturing spread. Gas fees (blockchain transaction costs) are variable but typically between US$0.01 and US$2.00 on networks like Base and Arbitrum. Taxation in Brazil: capital gains of 15% to 22.5% on profits from sales above R$35,000/month.

The big tax difference: in DeFi, you pay tax on gains actually realized, at exit. In traditional fixed income, income tax is deducted automatically. In DeFi, you control when and how you realize gains.

Risk and protection: what happens when something goes wrong

Every investment carries risk. The question is the nature of the risk and the protection mechanisms.

Poupança and CDB: Protected by the FGC (Fundo Garantidor de Créditos) up to R$250,000 per taxpayer per institution. This is a real safety floor. But the FGC has a finite fund (approximately R$120 billion in 2025). If a systemic crisis hits multiple institutions simultaneously, the coverage may prove insufficient. The risk is low, but it is not zero.

Tesouro Direto: Guaranteed by Brazil's National Treasury. It is considered the country's safest investment in terms of credit. The risk here is sovereign: if the federal government defaults, the Tesouro Direto is affected. Historically unlikely, but not impossible.

DeFi with self-custody: Counterparty risk is eliminated. Your assets sit in audited smart contracts, not under third-party custody. The risks are: smart contract vulnerabilities (mitigable by choosing audited protocols with solid track records), underlying asset volatility (eliminated by using stablecoins), and regulatory risk (evolving, but not yet consolidated in Brazil).

The fundamental difference: in the traditional financial system, risk is opaque. You do not know what the institution does with your money. In DeFi, the code is open. Anyone can audit the contract. Risk is transparent.

In the traditional financial system, you trust institutions to manage risks you cannot see. In DeFi, you audit the risks directly in the code.

Purchasing power over 5 and 10 years: a comparative projection

Projecting long-term yields requires assumptions. We use moderate scenarios based on historical averages.

Assumptions for 5 years (2026-2031):

• Average IPCA: 4.5% per year
• BRL/USD depreciation: 6.5% per year
• Average Selic: 11.5% per year
• Average DeFi yield: 7% APY in USD

R$50,000 invested. Real value adjusted for inflation after 5 years:

Instrument	Nominal (R$)	Real (R$, IPCA)	USD Equivalent
Poupança (7%)	R$70,128	R$56,185	~USD 7,185
CDB 100% CDI (net 9.5%)	R$79,098	R$63,372	~USD 8,104
Tesouro IPCA+ 6% (net)	R$82,884	R$66,404	~USD 8,492
DeFi 7% USD (stablecoins)	R$91,347*	R$73,185	~USD 9,360

*DeFi value considers initial conversion at R$5.70, yield in USD, and reconversion at projected exchange rate.

Over 5 years, the gap between poupança and DeFi stablecoins exceeds R$17,000 in real terms. Over 10 years, with compound interest and accumulated currency depreciation, the divergence becomes dramatic.

This does not mean DeFi is for everyone. It means that excluding this asset class from a wealth comparison is analytical negligence.

Why dollar-denominated yield matters for the Brazilian investor

Brazil has a turbulent monetary history. Since the Plano Real in 1994, the real has lost more than 80% of its value against the US dollar. That is not alarmism. It is the historical BRL/USD exchange rate record.

For anyone planning long-term wealth, currency denomination is not a detail. It is a foundation. A portfolio entirely in reais is exposed to monetary policy decisions, electoral cycles, fiscal crises, and external shocks that affect the exchange rate.

Having a portion of your wealth generating yield in dollars functions as a structural hedge. Not because the dollar is perfect. But because monetary diversification reduces concentrated risk.

DeFi strategies in dollar-pegged stablecoins provide this exposure without needing a foreign account, without IOF remittance tax (5.38% for investments), without international brokerage bureaucracy. You convert reais to stablecoins, activate a yield strategy, and your wealth grows in hard currency.

How to start investing in DeFi with safety and self-custody

If the numbers make sense to you, the practical path is more direct than it seems.

1. Define the portfolio allocation. Start with a percentage you are comfortable with. There is no universal rule. For many investors, 10% to 30% of wealth in dollar-denominated DeFi yield is a reasonable starting point.

2. Choose a platform with self-custody. The difference between DeFi through a centralized exchange and DeFi with self-custody is the difference between asking permission and having ownership. Platforms like Chainless offer access to DeFi strategies with an MPC wallet, where your assets remain under your control.

3. Convert to stablecoins. USDC (issued by Circle, backed 1:1 by US dollars) is the reference stablecoin for DeFi yields. The conversion from reais to USDC can be done directly on the platform.

4. Activate a strategy. With Chainless, yield strategies are activated with a single tap. No need to interact manually with smart contracts. The complexity stays in the infrastructure. For you, it is a decision: which strategy, which risk profile, which time horizon.

5. Monitor and adjust. DeFi yields fluctuate with market demand. Monitor periodically and adjust allocations according to your plan.

Does the poupança still make sense in 2026? For whom and when

It would be dishonest to say the poupança is irrelevant. For a short-term emergency reserve, its immediate liquidity and tax exemption have value. If you need R$5,000 accessible at any moment for unexpected expenses, the poupança serves that purpose.

But as a wealth-building instrument? The numbers show it does not. The poupança loses to inflation in high-IPCA environments, consistently loses to CDB and Tesouro, and does not belong in the same conversation when compared with dollar-denominated yields.

The point is not to abandon the poupança. It is to understand its limited role and not confuse that role with a wealth strategy.

Conclusion: the comparison the traditional financial system does not want you to make

The comparison between poupança, CDB, Tesouro Direto and DeFi reveals an inconvenient truth for the traditional financial system: the instruments most accessible to the average Brazilian are the ones that protect purchasing power the least over the long term.

The poupança loses to inflation silently. CDB and Tesouro are superior, but limited by their denomination in reais. DeFi in dollar-pegged stablecoins with self-custody combines real yield, currency protection, and sovereignty over your assets.

There is no investment without risk. There is investment with transparent risk and investment with opaque risk. The decision about where to place your wealth starts with understanding that distinction.

The numbers are on the table. What you do with them is your decision.