Does ISA interest count towards the annual ISA allowance of £20,000?

Hi, I opened a new Cash ISA that pays daily interest. So far, I have deposited £10,000 into the Cash ISA and received £100 as interest. I want to utilize the maximum Cash ISA allowance of £20,000. Am I allowed to transfer an additional £10,000, or only £9,900, since my current balance is £10,100 due to the £100 interest?

Hi Dhrub,
Please see guidance here:
Individual Savings Accounts (ISAs)
Which confirms You do not pay tax on interest on cash in an ISA.
Thank you.