As explained in NIM25001, a person is not entitled to pay (ie, is precluded from paying) Class 3 NICs in certain circumstances. One of those is that they cannot pay for a tax year if their earnings factor (“EF”) or the aggregate of their EFs from:
is equal to or exceeds the qualifying EF (see NIM25001) for that tax year.
Miss A’s EF for the 2003/04 tax year is £25,000. This
is derived from earnings on which she has paid Class 1 NICs.
The qualifying EF for that year is £4,004. As her EF
exceeds that figure, Miss A is precluded from paying Class 3 NICs
for the 2003/04 tax year.
For details of the other circumstances in which a person is
precluded from paying Class 3 NICs, see
NIM25007 - NIM25017.