The housing market in many parts of the country is strong this spring. If you’re buying or selling a home, you should know how to determine your “basis.” How it works You can claim an itemized deduction on your tax return for real estate taxes and home mortgage interest. Most other home ownership costs can’t be deducted currently. However, these costs may increase your home’s “basis” (your cost for tax purposes). And a higher basis can save taxes when you sell. The law allows an exclusion from income for all or part of the gain realized on the sale of your home. The general exclusion limit is $250,000 ($500,000 for married taxpayers). You may feel the exclusion amount makes keeping track of the basis relatively unimportant. Many homes...