How Brazil's public debt works: types, costs and economic impacts

Brazil is engaged in a constant debate about how it manages its public debt. The accumulated volume, which already exceeds seventy percent of Gross Domestic Product (GDP), is not just a spreadsheet number; it determines how much the State can invest in health, education and infrastructure, influences interest rates and, above all, conditions the confidence of domestic and international investors. This article presents, in an accessible way, the main types of debt, how costs are calculated and the practical implications for the country’s economy.

Origin and classification of public debt

Public debt arises from the need to finance fiscal deficits – the gap between government revenues and expenditures – or to refinance loans that are maturing. In Brazil, it is divided into two main categories: domestic debt and external debt.

• Domestic debt: issued in reais, usually through securities traded in the domestic market, such as Treasury Bills (LTN), Treasury Notes series B (NTN-B) and Treasury Financial Bills (LFT). These securities are bought by banks, pension funds, individual investors and, to a lesser extent, the Central Bank itself.
• External debt: issued in foreign currencies – mainly dollars and euros – and traded in international markets. The Brazilian government resorts to this type of debt to raise funds when the domestic interest rate is too high or when it seeks to diversify its creditor base.

Beyond the geographic distinction, debt can also be classified by maturity and remuneration method:

1. Short-term vs. long-term: securities with a maturity of less than one year are considered short-term, while those that exceed this horizon are long-term. In Brazil, most of the debt is concentrated in the medium and long term, which reduces the need for constant rollover of resources.
2. Fixed or floating remuneration: some securities pay pre-defined interest (fixed rate), such as NTN-F, while others index remuneration to the Selic rate or inflation (IPCA), like LFT and NTN-B. This variety allows the Treasury to balance debt cost under different economic scenarios.

How debt costs are calculated

The cost of public debt is not limited to the nominal value of the securities. It comprises three essential components:

• Interest: the remuneration paid to investors. When the Selic rate is high, the interest on domestic debt rises, increasing public spending. External debt, on the other hand, has its cost linked to the exchange rate and international conditions.
• Amortization: the repayment of principal when the securities mature. In years of large refinancing, the government must raise new resources to honor the old ones, generating rollover risk.
• Primary expense: the difference between revenues and expenditures, excluding interest. When the government posts a primary deficit, it must issue more debt to finance the gap, expanding the total stock.

The most commonly used indicator to gauge debt burden is the debt-to-GDP ratio. When this ratio approaches or exceeds the 100 % mark, fiscal sustainability becomes a concern for rating agencies and investors.

Macroeconomic consequences

The effects of public debt are multiple and interrelated. Among the main impacts, the following stand out:

• Crowding out of private investment: resources that the State absorbs to pay interest can be diverted from productive investments, reducing the capacity to generate jobs.
• Pressure on interest rates: to attract buyers, the Treasury may need to offer higher yields, which raises the benchmark interest rate and makes credit more expensive for companies and households.
• Exchange-rate risk: external debt creates vulnerability to dollar fluctuations. A depreciation of the national currency raises the repayment cost in reais, potentially compromising the balance of public accounts.
• Impact on fiscal accounts: the larger the share of interest in the budget, the smaller the margin for social policies and infrastructure investments.
• Rating and market access: rating agencies analyze the debt trajectory to assign scores that influence borrowing costs. A low rating can significantly raise the interest demanded by investors.

Beyond these macro effects, public debt directly affects citizens' lives. When the government pays more interest, there is less room to cut taxes, improve public service quality or expand income-transfer programs. In high-debt scenarios, inflation can rise, eroding households' purchasing power.

How readers can protect themselves and stay informed

For those who follow the domestic economy, some precautions are recommended:

1. Watch the Selic rate: it is the main reference for the interest on domestic debt and influences the return on fixed-income investments.
2. Diversify investments: by including assets linked to different indices (IPCA, dollar, foreign currencies), investors reduce exposure to a single type of risk.
3. Follow the Treasury National reports: the agency publishes a monthly “Public Debt Report,” which details issuance, maturities and costs.
4. Understand the fiscal impact on public policies: debates about tax increases or spending cuts are usually tied to the challenge of balancing the debt account.

Conclusion

Brazil's public debt is an essential instrument for financing the State's needs, but its size, composition and costs have profound implications for economic stability and the population’s well-being. By understanding the different types of debt, how charges are calculated and the macroeconomic consequences, citizens gain clarity to assess fiscal policies, plan their investments and hold policymakers accountable for pursuing sustainable balance. Ultimately, the health of public accounts reflects Brazil’s ability to promote inclusive growth and guarantee opportunities for future generations.