The mortgage interest credit helps lower-income individuals afford home ownership. You must contact the appropriate government agency about acquiring a Mortgage Credit Certificate (MCC) before getting a mortgage or buying a home.
If you itemize your deductions, you must reduce your home mortgage interest deduction by the amount of the mortgage interest credit you claim.
Publication 17, Your Federal Income Tax, Chapter 38 - Other Credits - Under Nonrefundable Credits, see Mortgage Interest Credit for essential guidance
Publication 530, Tax Information for Homeowners - See Mortgage Interest Credit for detailed guidance