With Brazil's presidential elections fast approaching, market focus remained pinned on the contest.
An AtlasIntel/Bloomberg poll showed Brazilian Senator Flavio Bolsonaro and President Luiz Inacio Lula da Silva remain statistically tied in a simulated runoff ahead of next month's vote.
Surveys lately continue to point towards a neck-and-neck race, with market sentiment heavily driven by shifts in electoral odds.
Against this backdrop, President Lula announced a 15% increase in cash transfers under the country's flagship welfare program, Bolsa Familia, to shore up his support ahead of the election.
The program adds to investor anxiety over the deteriorating public finances under the current government.
"Brazil's most pressing challenge is to sustainably reduce its abnormally high interest rates, which are weighing heavily on the public sector, businesses, and households," Barclays analysts said in a note.
"With real rates still near double digits, maintaining the status quo for another four years is unlikely to be viable."
The benchmark Ibovespa index .BVSP lost 0.3%, while the real BRL= inched slightly lower.
On the monetary policy front, Brazil's central bank on Wednesday cut interest rates by 25 basis points for a fifth straight meeting amid firmer signs of an economic slowdown while keeping its options open ahead of the election.