The loan period and loan amount in the house purchase contract only represent your loan intention and do not serve as a certificate. The specific loan situation is based on the loan contract signed between you and the bank. The Real Estate and Land Bureau doesn’t care how your funds are delivered. So there is no impact. No need to change.

If you must change the house purchase contract, you need to go to the Housing Authority to cancel the previous contract, which is very troublesome and it is impossible for the developer to handle it. If the bank does not lend you a loan, you can change the loan contract, but you will need to go through the interview and all approval procedures again, and the bank may refuse the loan. If the loan is released, it cannot be changed.