Will my son get first-time buyer stamp duty relief if we get a joint mortgage?

We don’t know how two buyers of different status affect the applicationQ I own the house I live in and want to help my son buy a flat. If we get a joint mortgage, what rate of stamp duty will apply given that he doesn’t currently have a property? SGA If you get a joint mortgage with your son and become the joint owner of the flat, your son will not be able to claim the first-time buyer’s stamp duty land tax (SDLT) relief announced in last week’s budget, and the higher rat