When filling in the real estate tax source information, the original price of the house should be calculated and filled in according to the relevant national accounting system. When declaring and paying the property tax, the system will automatically generate the tax amount according to the residual value after deducting 25% from the original value of the property. If you do overpay, you can deduct it from the property tax or apply for a tax refund for your own use in the next period.