The P46 was a form given to new starters at a place of work by their new employer to ensure they pay the correct Income Tax via PAYE when they start the role. It outlined information regarding the employees financial situation and their expected net income, for example giving details of whether they expected to make student loan repayments, also worked another job or if they claim certain benefits. This information is then passed to HMRC by the new employer so that they can put the new starter onto the correct tax code.
The P46 has now, however, been discontinued. It was essentially a backup for the P45 that the employee would have received upon leaving their previous job. The P46 has now been replaced with the new starter checklist that details your National Insurance information and any student loan information.
If you end up on an emergency tax code (due to not providing a P45 or new starter checklist), it’s likely that you’ll be charged too much tax when you first start your job. You can get this remedied by contacting HMRC online and they will issue you a refund, known as a tax rebate.
The best way to find your National Insurance Number is on your payslips or through your personal tax account. To locate your National Insurance number via the HMRC website, you’ll need to enter some personal details and it will be available immediately.