Tax Guy: Dear Tax Guy: ‘What happens if I sell my existing house to pay off the loan on my new home? How much tax will I owe?’ Posted on November 15, 2022 By Charlielikes The rules connected to the capital-gains exclusion with home sales are complicated. Stock Market Tags:‘new, “my, ‘i, ‘to, ‘will, dear, existing, guy, happens, home, house, how, if, loan, market, much, off, on, owe, pay, sell, stock, stock market, tax’, the, what