Hi,
Yes, this is correct, if you earn between the lower earnings limit (£6396 for the 2024-2025 tax year) and the primary threshold (£12570 for the 2024-2025 tax year) you will not pay class one National Insurance contributions on these earnings but the earnings that you have received will count towards a qualifying year for pension purposes.
For the 2021-2022 the lower earnings limit was £6240 and the primary threshold was £9568.
Further information on National Insurance contributions thresholds can be found here -
National Insurance: introduction How much you pay
If any years where you have earned above the lower earnings limit are shown as ‘not full’ you will need to contact the National Insurance helpline to check that the employment is shown on your records. The number to ring is 0300 200 3500, lines are open from 8am to 6pm, Monday to Friday.
Thank you.