Do I Need Self Assessment If I Earn Outside PAYE?

Short answer

PAYE usually deals with your employment income only. If you earn money from a source outside your employment, such as freelancing, trading, selling goods or services, or other untaxed activity, that income is generally separate and may not be dealt with by PAYE. A common first check is whether Self Assessment may apply for any income you receive outside of your employer's payroll.

What PAYE usually covers

PAYE (Pay As You Earn) is the system UK employers use to collect Income Tax and National Insurance from employees before paying their wages. Your employer calculates the tax due on your employment income and pays it to HMRC each pay period. If all your income comes from one PAYE employment and you have no other income, PAYE typically handles your tax automatically.

• PAYE generally covers: your salary or wages from your employer
• PAYE generally does not cover: income from self-employment or trading
• PAYE generally does not cover: income from freelance work you carry out separately
• PAYE generally does not cover: income from selling goods or services outside your employment
• PAYE generally does not cover: most rental, investment, or other untaxed income

What income outside PAYE means

Income outside PAYE is any income not processed through your employer's payroll. This includes money you earn from your own activity, such as trading, freelancing, content creation, tutoring, selling goods, delivery work, or providing services. It can also include other untaxed income such as certain savings interest or dividends, depending on the amounts and your circumstances.

Common examples of income to check

Income outside PAYE that may warrant a Self Assessment check includes:

• Self-employment income (sole trader work, freelancing, consulting, contracting)
• Income from selling goods online where this is trading activity (buying to resell, creating goods to sell)
• Tutoring, coaching, or teaching income
• Delivery or courier work
• Content creation income (video, writing, social media, podcasting)
• Dog walking, cleaning, gardening, or other personal services provided for payment
• Savings interest above your Personal Savings Allowance
• Dividends above your Dividend Allowance (check HMRC guidance for current amounts)

Can I be employed and self-employed at the same time?

Yes. Having a PAYE employment does not prevent you from also carrying out self-employed or trading activity. The two are treated separately for tax purposes. Your employer handles the tax on your employment income through PAYE, but income from self-employment or trading is separate. If that separate income is over relevant thresholds, Self Assessment may apply.

Does my employer tell HMRC about my side income?

No. Your employer reports your employment income, and the tax and National Insurance deducted from it, to HMRC through PAYE. They do not have visibility of income you earn from activity outside your employment, and PAYE reporting does not include it. HMRC's knowledge of your side income comes from what you report through Self Assessment, not from your employer's payroll submissions.

What if the income is small?

If your total gross trading or self-employment income (before expenses) is £1,000 or under in a tax year, HMRC's trading allowance may mean Self Assessment is not required for that specific income. The allowance applies across all your trading income combined in the year.

• The threshold is gross income (before expenses), not profit
• If your gross trading income stays at £1,000 or under, you may not need to register
• Self Assessment may still apply for other reasons even if your trading income is small (for example, other untaxed income, or income over £100,000)

What if tax has already been deducted?

Some income may have had tax deducted before you received it. For example, contract workers in certain sectors (such as construction) may have tax deducted under the Construction Industry Scheme (CIS). Having tax deducted at source does not automatically mean Self Assessment is not required.

• Tax deducted at source may reduce what you owe, but the deduction does not automatically make a return unnecessary
• Whether a Self Assessment return is required depends on your wider circumstances and any other HMRC triggers
• If you are unsure, check using official HMRC guidance or the free checker below

What to check before assuming no Self Assessment is needed

Before assuming Self Assessment does not apply, it may be useful to check:

1. 1Whether you have any income outside PAYE (from trading, freelancing, services, or other sources)
2. 2Whether that income is above the trading allowance threshold (£1,000 gross in the tax year) if it is from trading or self-employment
3. 3Whether any other reason may require a Self Assessment return (for example, income over £100,000, significant savings interest above your allowance, or dividends above your Dividend Allowance)
4. 4Whether you are already registered for Self Assessment for any reason
5. 5What the current GOV.UK check tool says when you work through it

When to get professional advice

This article gives general guidance for UK beginners. If your situation is more complex, for example, you have multiple income sources, you are also a company director, you have prior years to consider, or the amounts are significant, speaking to a qualified accountant or tax adviser is the appropriate next step.