What are the tax implications of buying a house before selling

The tax implications of buying a house before selling include potentially Capital Gains Tax (CGT) when you sell your old house.

This is because it will no longer be fully covered by Private Residence Relief. Income Tax on the rents you receive from your old house if you become a landlord. Plus an extra 3% Stamp Duty on the new house you buy, which is over and above the standard Stamp Duty rates.