Question: what forms do i need from my employer to file taxes?
Answer: Payslip. Your employer should give you a written payslip each pay-day, showing your gross pay, tax and National Insurance deductions, and the net amount you receive. ... 
Form P60. This is a summary of your payslips for the year. ... 
Form P45. ... 
Starter Checklist (formerly form P46) ... 
Form P11D.