When you use the Choose Tax Year option in the payroll year end process, sometimes the current tax year isn't available.
This happens in a tax year where you didn't process any payments.
The current tax year is only available in the Payroll Year End process if you process one or more payments during the year.
As a workaround, create an employee record and process a £0.00 payment for each tax year that's missing, starting with the earliest.
For example, if the first tax year that's missing is 2025/2026, enter 05/04/2026.
You can now click the Payroll Year End Choose Tax Year option, and the current tax year is available to select.