How do you claim for SEISS?
[ch 2: page 13]There is an online tool to find out if you are eligible to make a claim. You will need your self-assessment unique taxpayer reference (UTR) number and National Insurance number.
If you are eligible to make a claim, HMRC will tell you the date you will be able to claim from and ask you to add your contact details.
Applications for the first three months must be made by 13 July 2020. Applications for the second three months will open in August 2020.
Guidance on applying for an SEISS grant can be found at: https://www.gov.uk/guidance/claim-a-grant-through-the-self-employment-income-support-scheme.