PARIS — French lawmakers formally approved the country’s 2026 social security budget on Tuesday, handing Prime Minister Sébastien Lecornu an important political victory and offering some optimism to skittish markets worried France isn’t serious about getting its public finances in check. The bill, which covers state health care and pensions spending, was expected to pass after having already been approved by the National Assembly, France’s more powerful lower legislative chamber, last week, but its rejection by the Senate over the weekend forced another vote. The conservative Senate rejected the measure in part over concerns the legislation does not sufficiently bring down the budget deficit. As part of a compromise to ensure his government’s survival, Lecornu approved a measure in the law that suspends until 2027 the controversial law passed in 2023 that raised the retirement age for most workers from 62 to 64. The government now faces the more arduous task of passing a state budget for next year, which is a separate piece of legislation. The National Assembly’s first attempt to pass a state budget ended with all but one MP voting against the bill, which MPs had saddled with untenable and sometimes conflicting amendments. Lawmakers from both branches of parliament will on Friday attempt to forge a compromise text during a U.S.-style conference committee in what one National Assembly official described as a “make or break” moment. France is highly unlikely to face a government shutdown similar to what happened in the United States earlier this year as lawmakers can approve a measure carrying the 2025 budget over into next year. But such a stopgap would exacerbate the worrying financial outlook in the European Union’s second-largest economy. France’s current fiscal plans for 2026 are now projected to carry a budget deficit to 5.3 percent of gross domestic product, significantly higher than the 4.7 percent of GDP deficit initially proposed by the government and welcomed by the European Commission. Lecornu said in October that whatever fiscal plans lawmakers agree on should not carry a budget deficit for 2026 that exceeds 5 percent of GDP.