2nd job tax query

[gretsch drummer]

I'm currently employed by royal mail on a 28hr contract but I've been offered a job in a workshop to help restore classic cars on my day off during the week plus a half day (so about 15hrs per week). The boss is wanting everything on the books for insurance purposes etc.

What type of tax bracket/payments would I expect to pay on this ~15hrs and how would it effect my tax and NIC payments through Royal Mail?

Cheers.

[gretsch drummer]

Great stuff, cheers Sumo. As long as I don't end up getting taxed more overall than I'll be bringing home from the 2nd job I'll be happy.