Brazil votes: a coin-toss election and a fiscal bill that can’t wait

A race decided inside the margin of error

Brazil holds its general election on 4 October, with a presidential run-off on 25 October. On current polling a run-off is all but certain, and the two names on that second ballot are almost certainly President Luiz Inácio Lula da Silva and Senator Flávio Bolsonaro, the eldest son of the imprisoned former president. While the first round looks settled, the second does not. The run-off simulations have converged on a statistical dead heat. This is a coin toss, and it may stay one into the final week.

Markets have begun to react, but in a race this close, small shifts could still prove decisive in a race this close.

Both candidates carry high rejection rates, helping explain why the race remains so close. In this environment, late campaign developments may matter more than policy detail, while both campaigns have remained vague on the fiscal plans investors care most about.

The most likely determinant of the 25 October result is a headline that hasn't been written yet, not the economic programmes.

Congress is the other election

The presidential contest is only half the story. On 4 October Brazilians also elect all 513 members of the Chamber of Deputies, 54 of the 81 Senate seats – a two-thirds renewal – plus 27 governorships and every state assembly. An electorate of more than 150 million is registered to vote.

Brazil's open-list proportional system reliably produces a fragmented Chamber of more than 20 parties, which makes the ideologically flexible Centrão bloc the pivot of any governing majority. Lula won the presidency in 2022, while Bolsonaro's Liberal Party became the largest single party in both houses. The result was four years of expensive coalition management. The composition of the next Congress will determine whether the winner can legislate a fiscal adjustment or merely announce one.

For bondholders, the congressional arithmetic is arguably the more important number on election night.

Strong economy, expensive government

The economy the winner inherits isn't in crisis. Unemployment is near historic lows, the harvest is at record levels, external accounts are manageable, and the central bank has re-established credibility. Copom cut the Selic to 13.75% on 16 September, the fifth consecutive 25 basis-point reduction, after headline and core inflation decelerated below the top of the tolerance band.

The problem is the budget. Gross general government debt reached 82.5% of GDP in July, the highest since 2021. It rose 3.3 percentage points in the first half of the year – and accrued interest alone contributed 4.9 points of that. The 12-month nominal deficit stood at 10% of GDP in June against a primary deficit of just 1.2%, meaning an interest bill running around 8.8% of GDP.

The Finance Ministry's argument that high rates, not spending, are driving the debt is arithmetically defensible. It's also incomplete. A large share of Brazilian debt is indexed to the policy rate and reprices almost immediately, so the interest line is genuinely rate-sensitive in both directions. But the primary balance is still negative, and the debt ratio won't stabilise on lower rates alone. Both halves of that equation must move.

What high rates do to everyone else

Borrowing costs of this order aren't an abstraction confined to the Treasury's accounts. With a policy rate of 13.8% and a real rate near 9%, credit is rationed rather than priced. Leveraged corporates refinance at punitive spreads, capital expenditure is deferred, and consumer-facing sectors – retail, housing, autos – carry the adjustment. Households service some of the most expensive consumer credit in the world. The same rate that protects the currency suppresses the kind of investment Brazil needs to lift a potential growth rate that's stuck below 2%. This is the real cost of the fiscal position, and it's paid by companies and households.

The agenda – and the prize

The next administration's first task is to put the debt ratio on a credible declining path. This requires a primary surplus large enough to stabilise debt, a spending framework that survives contact with the electoral cycle, and structural reform – expenditure rigidities, earmarking, and the administrative and income-tax agendas – to make that surplus durable, rather than a single year's effort.

The reward for doing it is unusually large, because the starting point is so distorted. A credible consolidation lowers the risk premium. A lower premium lets the central bank cut further and faster without endangering the inflation target; lower rates cut the interest bill, which is the single largest line in the deficit; and the process compounds. That releases fiscal space for investment and public services, and monetary space for private investment – the growth Brazil hasn't had in a decade.

The opposite path compounds too. On unchanged policy, the debt ratio keeps climbing, the interest bill keeps absorbing the budget, and the market keeps charging for the doubt.

Brazil isn't choosing between two economic programmes on 25 October. It is choosing who will be in a position to make that choice – and, in the congressional vote three weeks earlier, how much room they will have to act. Investors should watch the Chamber and the Senate as closely as the presidential count.