Legal analysis: after completing the online signing procedures, you can go to the tax hall to pay the tax, pay the tax, if the contract agreement is to each pay the tax, then the two must be present at the same time; if it is the owner of the actual collection, only the buyer needs to be present.

Legal basis: "The Chinese People's **** and the State Urban Real Estate Management Law"

Article 36 The transfer of real estate, mortgages, the parties shall, in accordance with the provisions of Chapter V of this Law, for the registration of ownership.

Article 62 When real estate is mortgaged, registration of the mortgage shall be made with the department prescribed by the local people's government at or above the county level. Where land use right and house ownership are acquired as a result of the disposal of mortgaged real estate, transfer registration shall be made in accordance with the provisions of this Chapter.