Cash ISA maturing + another ISA with different provider

Hello, I opened a cash ISA in April 2024 (£20.000 allowance) and I have one from August 2023 that is maturing now in August 2024 (it also had £20.000, with interest it is now £21.000) - different providers too. My question is: can I reinvest this one that is maturing? If so, can I reinvest the £21,000 (£20,000 allowance from 2023 + £1,000 interest) or just the £20,000?

Hi,
If the amount of state pension in your code is incorrect, we can amend this - contact us by webchat or phone via Income Tax: general enquiries to allow us to do this.
Thank you.

I think you answer the wrong post... Still need help with my question: I opened a cash ISA in April 2024 (£20.000 allowance) and I have one from August 2023 that is maturing now in August 2024 (it also had £20.000, with interest it is now £21.000) - different providers too. My question is: can I reinvest this one that is maturing? If so, can I reinvest the £21,000 (£20,000 allowance from 2023 + £1,000 interest) or just the £20,000?

Hi Hadyne,
The maximum you can currently invest each year in ISAs is £20,000. 
You can have £20,000 in one account or split the allowance across multiple accounts.
As you have already invested £20,000 in the current tax year you will need to wait until the next tax year to invest a further £20,000 in any ISA account. 
Individual Savings Accounts (ISAs)
Thank you.