Definition: The term "mortgage interest deduction calculator" refers to a tool that can be used by borrowers who are looking to claim deductions on their mortgage interest expenses from government grants, loans, or any other form of financial support available through the government. The purpose of the calculator is to calculate how much the borrower can deduct from their tax returns, as part of their federal income tax filing. The definition of "mortgage interest deduction" involves calculating what percentage of the principal amount on a mortgage loan would be considered interest and subtracting that percentage from the total amount owed by the borrower. The amount deducted is typically reported on the borrower's federal income tax return as a "tax credit." In general, the application of this concept depends on the specific circumstances of each individual case, including their personal financial situation, the type of mortgage loan, and any other related expenses they have paid in relation to their home purchase. The process can be complex and may involve consulting with a tax professional or legal advisor for more detailed guidance. The term "mortgage interest deduction calculator" is used by individuals who are seeking assistance with calculating the deductions they qualify for on their mortgage interest expenses, as well as those looking to understand how these deductions affect their financial situation.