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What Is Tax Code K? A Clear Guide to Understanding and Managing It

Updated: Nov 25


What Does Tax Code K Mean?

A tax code starting with "K" indicates that your total deductions exceed your total allowances. This often happens when you have untaxed income, taxable benefits, or tax owed from previous years that surpass your tax-free personal allowance. Instead of allowances reducing your taxable income, a "K" code increases it, ensuring the right tax amount is deducted.


For example: If your tax code is K500, £5,000 is added to your taxable income, meaning you'll be taxed as if you earn an additional £5,000 annually.


Tax specialist from Ultra Tax Ltd assisting a client with their K tax code.

Why Am I on a K Tax Code?

You might have a K tax code for several reasons, including:


  1. Outstanding Tax from Previous Years

    • HMRC may adjust your tax code to recover unpaid taxes.

  2. Taxable Benefits

    • Benefits like a company car or private health insurance that are not taxed at source.

  3. State Benefits

    • Some state benefits, such as the State Pension, are taxable and can affect your tax code.

  4. Untaxed Income

    • Other income streams, such as rental or investment income, not taxed at source.

  5. Employer-Provided Expenses

    • Taxable expenses or benefits provided by your employer.



How Much Tax Will I Pay on a K Tax Code?

Under a K tax code, HMRC ensures that no more than 50% of your pre-tax wages can be deducted in tax during any pay period. Here’s an example calculation:


  • Tax Code K500: Adds £5,000 to your taxable income.

  • Annual Salary: £25,000 (England or Northern Ireland).

  • Additional Tax Due: £6,001.80 annually, deducted proportionally across pay periods.


How to Check if Your K Tax Code Is Correct

If you're unsure why you're on a K tax code, here’s how to verify:


  1. Review HMRC Correspondence

    • HMRC sends a breakdown explaining your tax code. Ensure your contact details are up-to-date to avoid missing notifications.

  2. Contact HMRC

    • Use their official phone or online services to query or correct your tax code.

  3. Protective Measures

    • Remember, under a K tax code, no more than 50% of your gross income can be deducted in tax during any pay period.



How Ultra Tax Ltd Can Help

Managing a K tax code can be complex, but at Ultra Tax Ltd, we simplify the process. Our services include:


  • Tax Code Reviews: Ensuring your tax code is accurate and reflects your circumstances.

  • Rebate Assistance: Identifying and reclaiming overpaid taxes.

  • Expert Advice: Helping you understand and manage tax code adjustments efficiently.


Common Questions About Tax Code K

Is Tax Code K Bad?

Not necessarily. It’s simply a mechanism to collect the correct tax on untaxed income or benefits. However, verifying its accuracy is important to avoid overpayment.


Can I Change My K Tax Code?

Yes. If you believe your tax code is incorrect, contact HMRC to have it reviewed. Ultra Tax Ltd can assist in ensuring your tax code is adjusted promptly.


What Happens if My K Tax Code Is Wrong?

An incorrect K code can result in overpaying or underpaying tax. Regularly reviewing your tax code helps prevent surprises.


Take Control of Your Tax Code with Ultra Tax Ltd

If you’re on a K tax code and need assistance understanding or managing it, Ultra Tax Ltd is here to help. Our expert team ensures you’re taxed fairly and that all errors are corrected quickly.


Contact us today to schedule a consultation and let us handle the complexities of your taxes while you focus on what matters most—your business.


Ultra Tax Ltd

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