These are emergency tax codes. Tax codes with ‘K’ at the beginning mean you have income that is not being taxed another way and it’s worth more than your tax-free allowance.

When to tell HMRC about a change in income?

You can also tell HMRC about a change in income that may have affected your tax code. HMRC may update your tax code if: You may also be put on an emergency tax code if you change jobs.

What do I need to know about my tax code?

Your tax code is used by your employer or pension provider to work out how much Income Tax to take from your pay or pension. This guide is also available in Welsh (Cymraeg). HM Revenue and Customs ( HMRC) will tell them which code to use to collect the right tax. You can also tell HMRC about a change that affects your tax code.

Do you have to pay tax on untaxed pre tax income?

Your employer or pension provider takes the tax due on the income that has not been taxed from your wages or pension – even if another organisation is paying the untaxed income to you. Employers and pension providers cannot take more than half your pre-tax wages or pension when using a K tax code.

When do I need a new tax code?

You need a tax code if you receive salary, wages, income tested benefits, interest, dividends or other income which has tax taken out before you get paid. Your tax code might be different for different types of income.

How is your tax code used by your employer?

Your tax code is used by your employer or pension provider to work out how much Income Tax to take from your pay or pension.

Where can I find the tax code on my payslip?

You can also find your tax code on your payslip or tax code letter from HMRC. If you think your tax code is wrong, you can update your employment details using the check your Income Tax online service.