You’ll get a P45 from your employer when you stop working for them.
Your P45 shows how much tax you’ve paid on your salary so far in the tax year (6 April to 5 April).
A P45 has 4 parts (Part 1, Part 1A, Part 2 and Part 3).
Your employer sends Part 1 to HM Revenue & Customs (HMRC) and gives you the other parts.
You give Part 2 and 3 to your new employer (or to Jobcentre Plus if you’re not working).
Keep Part 1A for your own records.
By law your employer must give you a P45 - ask them for one.
You don’t have a P45
You won’t have a P45 if you’re starting your first job or you’re taking on a second job. Your employer will need to work out how much tax you should be paying on your salary.
They may use a ‘Starter Checklist’ to collect the information, or may collect it another way. The Starter Checklist has questions about any other jobs, benefits or student loans you have. It helps your employer work out your correct tax code before your first payday.