Hi ju8689,
There are two ways to account for your sole trader income, regardless of where it arises.
You either use the traditional accounting method or the cash basis.
The cash basis is simpler to apply, but does have restrictions, that may mean it is not the best options.
Cash basis is the accounting of money coming into and going out of your bank account. E.g. "You invoiced someone on 15 March 2022 but did not receive the money until 30 April 2022. Record this income for the 2022 to 2023 tax year".
Guidance on the cash basis can be found here:
Cash basis
The traditional method of accounting will apply using the dates of the invoices e.g. "You invoiced a customer on 28 March 2022.
You record that invoice for the 2021 to 2022 tax year, even if you did not receive the money until the next tax year".
HS222 How to calculate your taxable profits (2022):
Thank you.