How can I switch tax codes?

tloz123

Hi there. This is pretty much my first time having an issue with income tax. I'm still a student (1st year of uni).
Basically, this my work history:
Working as a IT Housing Technician (Feb 2015 - Present. Zero Hour Contract. Can chose your own shift times. £10 p/h. Pay on a monthly basis).
Worked as a call centre agent (March 2015 - June 2015 Zero Hour Contract. Can choose your own shift times. £8 p/h. Pay on a monthly basis).
Online Shopper at Sainsburys (August 2015 - present. Part time. Contracted to 12 hours a week. Can work overtime if I want too. Pay on a monthly basis).
So right now, I have 2 jobs; IT Housing tech and online shopper.

This is what is confusing me now:

When I got my pay slip for the work I did in the call centre (37.5 hours in the course of 2 weeks); I got taxed approx £60. I'm new to tax but even I know that getting taxed £60 for just 37.5 hours is a lot. I was employed at the call centre place for 3 months but only worked 37.5 hours in total at that place. I was working at the call centre whilst I was employed with the IT Housing tech firm.
The IT Technician job is also a zero hour. No tax has been taken out when I worked for them(since I earned less than the tax and NI benchmark).

I never really work at the IT Technician place now since the hours are very unreliable but I am still employed by them. One time, I only worked 3.5 hours over the course of a month... (then again, its a zero hour contract).
So my question is this, why did I get taxed that much at my call centre job? Surely I shouldn't get taxed at all since I didn't earn over £883 in a month (I think that's the tax mark. Earn over that and you get taxed). And now I'm wondering how much they'll tax me at my work in sainsburys since I'm earning quite a lot due to overtime...

I'm new to this whole tax thing as I'm new to the working environment.

Thanks for the help though!

booksurr

how much you are taxed at any one job depends on what tax code that job holds for you

where you have multiple jobs then it is important that your tax code (ie your £10,600 pa total tax free amount) is split between the jobs otherwise one or more job would have to tax you on everything you earn as they will not be allowed to give you any tax free pay

you should check what tax code is shown on each of your payslips and if any of then state BR or 0T then you will need to contact HMRC and ask them to split the codes - your employer cannot allocate a code to you, they can only adjust it on instruction from HMRC. Beware however that as you have zero hour contracts splitting the code to a job where you do no work for long periods of time will be counter productive

read: https://www.gov.uk/student-jobs-paying-tax