Solved
Running March payroll for 2 directors. Both are paid the same / below NI threshold & have same payroll settings, however one has NI calculated, the other not. Why?
Original commenter did not share additional details
They have opening balances (earnings only, no deductions) from another payroll system but within the 20/21 tax year.
I did get hold of support in the end - they helped me post an adjustment and resubmit the payroll, but couldn't figure out why it had happened in the first place.
Anyway, problem solved for now - thank you for the reply though.
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