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What is my tax code?

On this page you can find out about:

Tax codes, what they are and how they are used

Your tax code is how your employer knows how much tax to deduct from your income. Different tax codes apply to different work situations, so it's important that you complete a Tax code declaration (IR330) form with the right tax code each time you get a new job. The tax code you use depends on how many sources of income you have and whether you have a student loan.

Work out your tax code

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You've received a letter saying you're using the wrong tax code

If we notice you are on the wrong tax code, we'll send you a letter asking you to update your tax code. If you don't do this, we'll contact your employer directly.

Once you know what tax code you should be on you need to complete the Tax code declaration (IR330) form and take it to your employer.

Work out your tax code

If you're using the wrong tax code

If you use the wrong tax code you'll pay too little or too much tax. This could mean you end up with a tax bill at the end of the year.

You can check if you're using the right tax code by going to: work out your tax code.

If you need to change your tax code, you should complete the Tax code declaration (IR330) form and give it to your employer.

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Why you need a different tax code for your second job

The tax code you use for your main job is worked out using only the income from that job. If you get a second or subsequent jobs, the tax code for each of these is worked out by taking into account your total income earned across all of your different jobs.

Different tax codes apply to different work situations, so it's important that you complete a Tax code declaration (IR330) form with the right tax code each time you get a new job.

Find out more about when to use secondary tax codes