The home-buyer tax credit offering $8,000 to first-time buyers and $6,500 to repeat buyers is set to expire at the end of April. The program, having already received two extensions in February and December 2009, isn’t expected to be extended past the April 30 deadline, which leaves prospective buyers only a few more weeks to qualify. In order to receive the credit, buyers must have a signed contract on or before April 30 and the purchase must be complete by June 30. Walter Molony, a spokesman with the National Association of Realtors, cautions those getting into the market now to be prepared to make quick decisions. Six things to keep in mind here. Key info here.