I currently have a fixed cash ISA which matures tomorrow. I also have a stocks and shares ISA and a cash help to buy ISA, both of which I have paid into this tax year. I'm thinking about transferring my maturing ISA into a S&S Life ISA but can I do this in this tax year? I thought a transfer didn't count as paying in (which I understand wouldn't be permitted) but I'm not entirely sure in this situation.

Also, it might warrant a second question, but can I use both a LISA and help to buy ISA when buying a house?

I currently have a fixed cash ISA which matures tomorrow. I also have a stocks and shares (S&S) ISA and a cash help to buy ISA, both of which I have paid into this tax year. I'm thinking about transferring my maturing ISA into a S&S Lifetime ISA but can I do this in this tax year? I thought a transfer didn't count as paying in (which I understand wouldn't be permitted) but I'm not entirely sure in this situation.

Also, it might warrant a second question, but can I use both a LISA and help to buy ISA when buying a house?