| Comment | You pay tax according to your total income, irrespective of how many jobs you have. So if one job doesn't use up all of your personal allowance (£11,850) then the rest can be applied to your second job. Or similarly if the combined income puts you above the high income threshold (£46,351), then you will pay tax at the higher rate on part of the income of the second job.
When you sign up for PAYE for the second job, then you should indicate on the 'new starter checklist' you have to submit that it's your second job, and you should then have a different tax codes on the payslips for the two jobs. If your employer is doing things correctly, and you fill out the checklist properly, this should all be sorted out automatically.
When you get your first wage slip from the second job, check the tax code - if you have the same tax code as the first job (you shouldn't), then you may be paying too much or not enough tax and should either get your employer to inform HMRC or call them yourself (don't ignore it or you might get an unpaid tax bill when they catch up with you - which they will).
https://www.gov.uk/tell-hmrc-change-of-details/income-changes |
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