Brazil's floating-rate debt share climbs to fresh high in August

Brazil's federal debt profile deteriorated further in August, with the share of liabilities tied to the benchmark Selic rate rising to 52.7% from 51.1% in July, Treasury data released on Monday showed.

The shift matters because a larger floating-rate component exposes government liabilities more directly to monetary policy. With borrowing costs still high, interest rate decisions feed more quickly into debt accumulation.

The increase came only a month after the Treasury lifted its 2026 ceiling for floating-rate debt to 53%, leaving the current share close to that limit.

Brazil's benchmark Selic rate stands at 13.75%, among the highest real interest rates in the world, even after an easing cycle that began in March. The data highlight the trade-off facing Latin America's largest economy: elevated rates help keep inflation in check, but they also raise the cost of servicing existing debt.

In August, the federal public debt rose 0.04% from the previous month to 9.293 trillion reais, equivalent to about $1.78 trillion, with interest costs accounting for 88.4 billion reais of the total.

The month also saw a net debt redemption. Bond issuance reached 211.6 billion reais, while maturities totaled 296.1 billion reais, meaning more debt came due than was sold.