Hi SaSa,
The annual allowance for 22/23 is £40000 or your taxable earned income, whichever is lower.
You do not need to pro rata this allowance, if you arrived in the UK part of the way through a tax year.
You can carry forward the unused element of your annual allowance from the 3 previous tax years and add it to your current annual allowance.
Have a look at the guidance here:
Standard individual lump sum allowance
Thank you.