LISBON—Prime Minister Pedro Passos Coelho said he would cut public employees' salaries, requires that all workers to pay more for social security, and raise taxes on the rich—the latest belt-tightening steps aimed at meeting Portugal's obligations under an international bailout program.

Mr. Passos Coelho made the announcement on television late Friday as viewers were absorbed by a World Cup qualifying match between Portugal and Luxembourg that was to start minutes later. He cast the measures, effective next year, as an attack on the country's 15% unemployment rate, which has been rising as a result of previous cuts in public spending.

Employees will be required to pay 18% of their salaries to social security, up from 11%, allowing companies to cut their contributions from 23.75% to 18%. "We will reduce substantially the costs of labor, providing incentives to investment and job creation," the Portuguese leader said.

Public workers will lose one paycheck out of the 14 they receive each year. Mr. Passos Coelho had scrapped an attempt to cut two months' salary after a court ruled in July that it discriminated against public employees. His speech Friday offered no legal rationale for the more modest cut.

The prime minister said he would hike taxes on profits of big corporations and wealthy individuals but gave no details.