Can I create ISA accounts for the last tax year?

Hello, I have been in the UK for two years. In the last tax year, due to my ignorance, I did not know about the tax benefits of the ISA accounts, and therefore I did not create them. Could I create them now and still benefit from the last tax year (£20,000 tax-free investments)? Thank you very much in advance!

No, unused ISA allowance is permanently lost when a new tax year starts.

Hi,
It is too late to open an ISA for  the 2023 to 2024 tax year. You can only open an ISA for the current tax year.
Thank you.