When you start a new job, your employer gives HMRC your income details. This is used to calculate your tax code. If you have more than one job you will have a tax code for each employment. Find out how tax works if you have more than one job.

If we do not get your income details in time, or you decide not to share this information with your new employer you may be put on a temporary emergency tax code.

If you have a new job you should:

• give your new employer your P45
• fill in the starter checklist if you do not have a P45 or decide not to share all your income details with your new employer

Check your details online

Your new employment details will be available to view within 6 weeks after your first pay day.

You can use the PAYE section of HMRC online services or the HMRC app to check:

• HMRC has details of all your current employers
• your estimated income for the year is what you think you will earn
• only one employer is using the 1257L tax code at any one time

Using the HMRC online service

1. Sign in to HMRC online services.
2. Go to the ‘Pay As You Earn (PAYE)’ section.
3. Select ‘check current tax year’ to view your PAYE Income Tax Summary for 6 April to 5 April.

Using the HMRC app

1. Download the HMRC app.
2. Go to the ‘Pay As You Earn (PAYE)’ section.

Update your details if they are wrong or missing

If your details are wrong or missing, you can use the HMRC online services or the HMRC app to:

• update your employer details
• add a missing employer
• tell us when an employment ended
• update your estimated income with an estimated amount for the full year or using recent amounts from a payslip

If you have other details to update you can tell HMRC about a change in your:

• employment income
• pension income
• company benefits like a company car or medical insurance

Keeping your tax code up to date helps make sure you pay the correct amount of tax. This makes it less likely you will pay too much or too little tax.

After you update your details

Not all changes you tell HMRC about will affect your tax code. We will tell your employer or pension provider if your tax code changes. Your next payslip should show your new tax code and any adjustments if you were paying the wrong amount of tax.

When you sign up for paperless updates you will get a message if your tax code changes. You can view these updates in the:

• messages section of your HMRC online account
• communication section of your HMRC app

Go paperless for tax code updates

You can choose to receive updates about any changes to your tax code by email or as an online message in your HMRC account or HMRC app. Find out how to go paperless for tax code updates.

If you need extra help using HMRC online services 

You can find out how to:

• get help from HMRC if you need extra support if you cannot use our online services
• register a friend or relative to help with your tax