Hi Tintin567 Lambden,
National Insurance (NI) is collected on individual pay frequencies if your earnings are above thresholds.
You can check your individual payslips in 2023/24 each time to see the National Insurance you pay any and your employer pays for you using the link to the NI calculator.
National Insurance
Jobs are not combined for National Insurance through pay as you earn, only if you pay NI this is totalled for the tax year to ensure you don’t exceed the maximum.
Thank you.