Understanding the tax implications of your side hustle

Oct 6, 2025

Side Hustles and Tax in the UK: What You Need to Know

In today’s gig economy, many people are exploring side hustles to supplement their income or pursue their passions. Whether you’re selling homemade crafts online, driving for a ride-sharing service, or offering freelance services, your side hustle can have tax implications that you need to be aware of. Below are some of the key considerations to help you stay on the right side of HM Revenue & Customs (HMRC).

  1. Reporting Your Side Hustle Income:

    The first and foremost rule of tax compliance in the UK is to report all your income, including earnings from your side hustle. Whether you’re paid in cash, through digital payment platforms like PayPal, or any other means, it’s your responsibility to declare this income to HMRC.

  2. Self-Employment Taxes:

    In the UK, your side hustle earnings are typically taxed as self-employment income if you operate as a sole trader. This means you are responsible for paying both the employee and self-employed portions of National Insurance (NI) contributions.

    As these rates may change over time, it’s crucial to check the latest figures on the HMRC website: Self-employed National Insurance rates – GOV.UK

  3. Deducting Business Expenses:

    The good news is that you can reduce your taxable income by deducting certain business-related expenses. Common deductible expenses include:

    • Supplies and materials
    • Home office expenses (if you work from home)
    • Advertising and marketing costs
    • Travel expenses directly related to your side hustle
    • Insurance premiums
    • Professional fees (e.g., fees paid to an accountant)

    Keeping accurate records is essential, so make sure to retain all relevant receipts and documentation, as HMRC may request proof.

  4. Registering as Self-Employed:

    If your side hustle generates significant income or you plan to continue it long term, consider registering as self-employed with HMRC. This formalises your status and ensures compliance with tax obligations.

    You must register by October 5th in your business’s second tax year to avoid penalties. You can register through the HMRC online portal or by calling the Newly Self-Employed Helpline.

  5. National Insurance Contributions (NICs):

    NICs contribute to your eligibility for certain benefits like the State Pension and Maternity Allowance. Check if you qualify for the Small Profits Threshold (SPT) or the Flat Rate Scheme to potentially simplify your contributions.

  6. Estimated Taxes:

    Unlike traditional employment, taxes aren’t automatically deducted from side hustle income. It’s wise to make quarterly estimated tax payments to HMRC to avoid a large bill at the end of the tax year.

    Use HMRC’s online calculators or seek an accountant’s help to estimate your liability accurately.

  7. Tax Credits and Deductions:

    Depending on your income and personal situation, you may be eligible for various tax credits. One common option is the Marriage Allowance, which could reduce your overall tax liability.

  8. Seek Professional Advice:

    UK tax law can be complex and is subject to change. A qualified accountant or tax professional can provide personalised advice and ensure you meet your obligations while maximising your deductions.

Considering All This…

While a side hustle can provide valuable additional income, it also comes with tax responsibilities in the UK. Reporting your income accurately, paying self-employment taxes, deducting eligible expenses, and staying informed about tax laws are essential steps to ensure you’re compliant with HMRC regulations.

By taking these measures and seeking professional advice when needed, you can enjoy the benefits of your side hustle without running into tax-related troubles.