How to calculate tax for second job

cagreen13

I currently work full time in a temporary job paying 25440 per year. I may have the opportunity of permanent hours, but only 18.5 per week. My ideal would be to find a 2-day second job, but I don't know how to calculate the tax I would pay to work out if it's affordable. I've tried the income tax ready reckoner on this site but I can't work out how to make it work for a second job, as it always takes off a tax free allowance. (I assume I would have no tax free allowance for the second job as it would all be swallowed up by the first one - is that right?)
I enjoy my job and want to stay, even if it's part time, but I just don't know how to work out if I can afford it.

ACG

Would it not just be 20% of everything, maybe a touch over with NI?

cagreen13

Is it that simple? 20% tax plus 12% NI? I'm just afraid I'm missing something!

Darksparkle

It would depend entirely on the pay for both jobs.

Tax looks at your total income, regardless of the number of jobs you have.

If you have already used your personal allowance in job one, then the 2nd job will be 20% tax (assuming you remain a basic rate tax payer.

But if job 1 doesn't use all your personal allowance then you would split the personal allowance between both jobs.

Eg if in April you started a 18.5 hr job on NMW £7.20 (assuming over 25) then that's only £6926 per year. So you'd still have £4074 personal allowance left to go against any second job.

NIC is different, you do get an allowance per employment (assuming the employments are unrelated).

You pay 12% NIC on anything over £155 per week per employment.

So again, in the 18.5hr job earning £7.20, that's £133 so no NIC.

cagreen13

Thank you - I didn't know about NI. My first job would definately take up my tax free allowance and I would pay NI. And it sounds as though it would be financially possible to get a second job that would bring in what I need...now the only issue is whether I can actually find one which dovetails with the first job....