The tax return price is determined by yourself. The computer system of the Housing Authority has the lowest evaluation price in each region. If the declared tax price you quoted is higher than the assessed price, the tax will be levied at your price. If it is lower, it will be calculated according to the evaluation price of the system. Local real estate agents in the same region know the evaluation price best, because they often go to transfer the ownership and know the minimum amount of money, so I suggest you go to the intermediary to find out.
Calculated by 300,000 yuan, the tax is about 25,000 yuan.