Using ISA allowance

Rockaway wrote: »

I opened a 1 Yr Virgin Fixed Rate E-ISA Issue 373 in March 2019 and added £8000 at the beginning of the 2019/20 tax year to add to the funds from previous years. It is due to mature on 24th March 2020. When I move it to another provider can I add the remaining £12000 of my allowance before 5th April?

Yes, as long as the move is done via the new provider's ISA transfer process.

Edit: on reflection, this will only comply with ISA rules if all of your 2019/20 contributions are in the same cash ISA on 5 April, so, as you might struggle to complete a transfer that quickly (during a busy time for ISA providers), you may need to pay the £12K into whatever easy access product Virgin uses for the proceeds of the fixed one, and then transfer it all to another provider once the new tax year starts.