That is, if you apply for a mortgage loan when you buy a house, the general bank stipulates that you can pay off the loan in one lump sum after 1 year, but the interest should be calculated according to this. Secondly, if you buy a second-hand house within five years, the business tax is generally 5.55% of the house price. However, you can find someone to make the evaluation price of the house low and pay less taxes.