Following a proposal developed by Waigel, the Kohl government agreed in February 1991 to an unexpectedly large package of tax increases – including a 7.5 percent surcharge on personal income and corporate tax payments – to help pay for reunification, as well as the government's contribution to the allied forces during the Gulf War and aid to Eastern Europe's fledgling democracies. In March 1992, Germany paid its final installment of $1.68 billion in Gulf War aid to the United States, fulfilling its overal pledge of $5.5 billion.