You will get a text message or email from NHS Test and Trace with your account ID number in it. If you don’t have a mobile phone or an email account you’ll get a letter. You will need this number to apply for your support payment.
Yes, the payment is taxed. You won’t be taxed when it’s paid to you. Her Majesty's Revenue and Customs (HMRC) will contact you later if you're employed. If you are self-employed, you will need to declare the payment on your self-assessment tax return.
National Insurance contributions aren't taken from the payment.