Finance Ministry secretary of state Liviu Voinea said 300,000 firms had debts to the state budget at the end of June.
According to the ministry, the measure would increase state budget revenues by 5%, Voinea added.
Romanian firms that have debts to the state budget will be exempted from paying penalties if they pay off the debt and the late payment interest between September 1 and December 31, 2012, Prime Minister Victor Ponta said Monday.