What counts as trading income on my self assessment tax return?

Trading income on your Self Assessment tax return includes any profits from regularly buying, selling, making or providing goods and services with the intention of making money. This covers most side-hustle and early-stage e-commerce activities that go beyond occasional personal sales.

HMRC looks at the frequency, nature and profit motive of your activities. Distinguishing between trading income and other types of earnings helps you claim the right deductions and avoid mistakes when filing.

What HMRC considers trading income

Trading income arises when you carry on a business activity expecting to generate profit. For UK early-stage founders and e-commerce sellers this usually means income from selling products online, providing freelance services, or running a small webshop. Occasional sales of personal items, such as decluttering your wardrobe on eBay, are generally not treated as trading.

Key factors HMRC examines include how often you trade, whether you organise the activity in a business-like way, and if you aim to make a profit over time. The rules change periodically so always check the latest guidance on GOV.UK before deciding how to report your income.

Typical side-hustle income types that count as trading

Common examples for UK side-hustlers and early e-commerce businesses include:

Profits from selling physical goods on platforms such as Etsy, Shopify or Amazon
Income from dropshipping or print-on-demand services
Fees earned for freelance design, virtual assistance or social media management
Money received from offering online courses, coaching or digital downloads
Revenue from reselling items bought specifically for resale
Payments for handmade crafts, customised products or subscription boxes

These activities normally count as trading income once they become regular and organised. One-off sales of second-hand personal belongings usually fall outside this category.

Allowable business deductions and expenses

You can usually deduct costs that are wholly and exclusively for your business. Typical allowable deductions for e-commerce and side-hustles include:

Platform fees, payment processing charges and advertising costs
Cost of goods sold, including stock purchases and shipping materials
Portion of home utility bills and rent if you use part of your home as an office or storage area (using simplified or actual expense methods)
Business equipment such as a laptop, phone or packaging machine, often claimed through capital allowances or as allowable expenses
Software subscriptions, bookkeeping tools and professional fees for accountants
Travel costs directly linked to business activities, such as visiting suppliers or markets

Keep clear records and receipts. Expenses must be reasonable; personal costs cannot be claimed. Thresholds and rules for what qualifies change, so verify current requirements on GOV.UK.

Practical steps to calculate and record trading income

Follow these steps to prepare accurate figures for your Self Assessment:

Separate personal and business bank accounts or at least track every business transaction clearly.
Record all sales income, including platform payouts and direct customer payments.
Log every allowable expense with date, amount, description and receipt.
Calculate gross profit by subtracting cost of goods sold from total sales.
Deduct other allowable business expenses to reach net trading profit.
Consider whether you need to register for VAT if your turnover approaches the current threshold; check GOV.UK for the latest figure.

Use simple spreadsheets or free accounting tools at the start. Consistency in record-keeping makes filing easier and supports your figures if HMRC makes enquiries.

Common mistakes and how to avoid them

Many early-stage sellers mix personal and business spending, making it hard to identify true allowable deductions. Another frequent error is failing to declare platform income that appears in foreign currency; convert using realistic exchange rates and keep records of the rates used.

Some assume that if they make a loss there is nothing to declare. Losses can sometimes be carried forward, but you must still report the trading activity. Always distinguish between hobby income and trading income; HMRC can reclassify activities and charge penalties for careless reporting. Review your records regularly rather than waiting until the January filing deadline.

When to seek extra help and register correctly

If your turnover grows or you take on employees, you may need to register as self-employed with HMRC or set up a limited company through Companies House. Corporation tax principles differ from self-assessment, so understand the basics early. Cash-flow management, accurate pricing and monitoring margins become increasingly important as activity scales.

Free support is available for selected UK founders through places such as Loomworks in Liversedge, which offers desks, a registered address and mentoring with no fees or equity taken. For tax questions, use HMRC’s online tools or speak to a qualified accountant. Rules and thresholds change, so check official sources each tax year.

Frequently asked questions

Does selling on eBay count as trading income?

It depends on the pattern. Regular buying and selling of items for profit, especially if you source stock specifically to resell, counts as trading income. Occasional sales of your own unwanted personal items are usually classed as non-taxable disposals. Keep records of your activity and check GOV.UK guidance if the volume increases.

Can I claim my home office as a deduction?

Yes, if you use part of your home exclusively for business. You can claim a proportion of utility bills or use HMRC’s simplified expenses method. The allowable amount depends on the space and time used for work. Record your calculations clearly and be prepared to explain them if asked.

What records do I need to keep for Self Assessment?

You should keep sales invoices, bank statements, receipts for expenses, and a summary of income and costs for at least five years. Digital records are acceptable if they are clear and complete. Good bookkeeping helps you calculate accurate trading profit and reduces the risk of errors on your tax return.

Do I need to register for VAT as an e-commerce seller?

You must register if your taxable turnover exceeds the current threshold. Certain goods and services have different rules. Check the latest VAT registration limits and requirements on GOV.UK and consider the flat-rate scheme if it suits your business. Early registration can sometimes be beneficial for reclaiming input VAT.

How do I declare foreign platform income on my tax return?

Include the sterling equivalent of all income received from overseas platforms. Use a consistent exchange rate, such as the rate on the day you received payment, and keep evidence of the rates applied. Report the gross income and then deduct allowable expenses in the normal way on your Self Assessment.

What counts as trading income on my Self Assessment tax return?