Tax for second job advice

[Nofoolfornoone]

I would welcome any advice from those who know about tax.

I currently have one full time job. I want to start doing casual work adhoc during weekends and holidays but I don’t want my main salary to be effected.
Is it possible to have my entire tax free personal allowance to my main job so my monthly salary does not change then on my second job pay the standard rate tax with no tax free allowance?

I want for my main salary to remain the same and my extra hours to just be that / extra hours.

Does that make sense and is it possible?

The extra job will likely push me into the 40% tax bracket , would that effect things?

Yes it's completely possible. I worked two part-time jobs for a while and contacted tax office to let them know which one I wanted to be my main job- the higher salaries job where tax free allowance would come out of.

My personal allowance is automatically applied to my main job and then I pay basic rate tax on all my earnings for my 2nd job which was done automatically also.

Of course. Phone the tax office. My main job I take my full tax code 1250L and my 2nd job I go BR. Works perfectly.

If you ticked the box on your starter declaration which says you already have another job then the 2nd job should automatically use the BR tax code.

Fab!! Thank you all!!

Yep, that'll be the norm. You won't pay NI contributions on the second job unless you earn over the threshold for that particular job either.

I had an issue previously where I started doing this and I did 4 Saturdays in a row so then tax office decided I would work every Saturday for while year and adjusted my main jobs tax code. I think it must have pushed me into a new tax bracket as it was a massive difference. So that’s why I’m nervous.
But I am so much closer to the tax bracket change now that I don’t think it will affect me as much, I hope.

You will be fine until you have earned enough to reach 40%. Once that happens HMRC just can't cope with sporadic second incomes and usually take a high earning month, multiply it by 12 and start taxing you at that rate and also code it for the following tax year. You will have to keep ringing them or try using an online tax account and keep changing your second income rate