SIPP 40% Tax to Reclaim for 2023/24

I have phoned HMRC to have the higher rate PAYE tax on SIPP contributions refunded in prior years. My question is, do I need to wait for my 2023/24 tax to be calculated on my online account or can I just phone now (11th April) to arrange the refund?

Hi,

You can phone now. However, if your payments exceed £10,000 for any year, you need to write in and supply evidence.

Thank you.