What is the main purpose of the P45 form?

The P45 form is primarily used to provide employees with a record of their tax details when they leave a job. Specifically, it outlines the total amount of income earned and the amount of tax paid on that income up to the date of leaving. This information is crucial for both the employee and their new employer, as it helps ensure that the correct amount of tax is deducted in subsequent employment. The P45 is particularly important for tax calculations and determining whether an individual is due for a tax refund or if they have paid the correct amount in the previous tax year.

The other options do not accurately reflect the purpose of the P45. A change of address does not specifically pertain to the P45's function, nor does the P45 serve as an application for a tax refund or a declaration of income from other sources. The focus remains on providing a clear summary of earnings and tax contributions at the point of leaving employment.