Originally posted by Walt42
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When you (or they) say "weekly NI allowance", I think you mean the Secondary Threshold (ST), which is currently £170/week.
Basically, the umbrella will get a chunk of money from the agency (based on your daily rate). The employment costs then fall into 4 categories:
* Company margin
* Pension (employer's contribution)
* Apprenticeship levy
* Employer's NI
Whatever's left becomes your gross salary, which is also your "earnings for NICs".
* Apprenticeship levy = 0.5% x earnings for NICs
* Employer's NI = 13.8% x (earnings for NICs - ST)
NB This creates a loop: the employer's NI and apprenticeship levy are calculated from earnings for NICs, but those earnings are calculated by deducting the apprenticeship levy and NI! I'm not sure what formula the umbrella can use for that, or whether they just do trial and error until everything matches.
My approach is to chuck all the numbers into Excel, then verify that they match. I.e. calculate what the apprenticeship levy and employer's NI should be (based on earnings for NICs) then verify that "lump sum - employment costs = earnings for NICs".


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