If you earn money from a side hustle in the UK, one of the most important rules to understand is the £1,000 trading allowance.

This allowance allows many people to earn small amounts of side income without needing to report it or pay tax. However, once you go over this threshold, different rules apply.

This guide explains how the trading allowance works in simple terms and when you need to take action.

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Quick Summary

• You can earn up to £1,000 per year in side income without declaring it
• This is known as the trading allowance
• If you earn more than £1,000, you may need to register for Self Assessment
• The allowance applies to total income, not profit

Understanding this rule is key for anyone starting a side income in the UK.

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What Is the Trading Allowance?

The trading allowance is a UK tax rule that allows individuals to earn up to £1,000 per tax year from self-employed or casual income without needing to report it.

This rule is set by HM Revenue and Customs and is designed to simplify small-scale earning activities.

It applies to income from:

• Freelancing or consulting
• Selling goods or services
• Online income streams
• Casual or irregular work

If your total income from these activities stays below £1,000 in a tax year, you generally do not need to take further action.

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When You Do Not Need to Declare Income

You usually do not need to register or submit a tax return if:

• Your total side income is £1,000 or less in a tax year
• You are not already registered as self-employed
• You have no other reasons to complete a Self Assessment return

Example:

Income	Action Required
£400 from freelance work	No reporting needed
£950 from online sales	No reporting needed

This makes the trading allowance particularly useful for beginners testing a side hustle.

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When You Must Declare Your Income

You must normally register for Self Assessment if:

• Your side income exceeds £1,000 in a tax year
• You are operating regularly as a sole trader
• You have other untaxed income to report

Example:

Income	Action Required
£1,200 side income	Must register and declare
£5,000 side income	Must register and pay tax

Once you pass the threshold, you are expected to report your income to HM Revenue and Customs.

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Important: It’s Based on Revenue, Not Profit

A common misunderstanding is that the £1,000 allowance applies to profit.

It does not.

It applies to your total income before expenses.

Example:

• You earn £1,200
• You spend £300 on expenses
• Your profit is £900

Even though your profit is under £1,000, your income exceeds the allowance — so you must declare it.

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Trading Allowance vs Claiming Expenses

Once your income exceeds £1,000, you have two options:

Option 1: Use the Trading Allowance

You can deduct £1,000 from your income instead of claiming expenses.

Option 2: Claim Actual Expenses

You can deduct your real business expenses instead.

You typically choose whichever gives the lower taxable amount.

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Common Mistakes to Avoid

Assuming small income doesn’t matter
Even small amounts must be declared once they exceed £1,000.

Confusing profit with income
The threshold applies to total earnings, not profit.

Missing registration deadlines
If you exceed the allowance, you must register in time.

Not tracking income properly
Keep simple records from the start.

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Final Thoughts

The £1,000 trading allowance makes it easier to start earning additional income in the UK without immediate administrative burden.

However, once your income grows beyond this level, you need to understand your responsibilities and take the correct steps.

For most people, this simply means registering for Self Assessment and reporting income each year.

UK Side Income Tax Explained Simply (2026 Guide)

Do I Need to Register as Self-Employed in the UK? (2026 Guide)

Want a simple way to track your side income and stay organised? A full UK side income toolkit will be available soon.