Amazon FBA Seller Tax Guide: What UK Sellers Need to Know

If you sell products through Amazon FBA, your income is taxable if you are trading as a business. If your total trading income is over £1,000 in a tax year, you usually need to register for Self Assessment and file a tax return.

This guide explains the key UK tax rules for Amazon FBA sellers, including Self Assessment, allowable expenses, inventory accounting, VAT, limited companies and HMRC compliance.

When Do Amazon FBA Sellers Need to Pay Tax?

HMRC expects you to declare trading income if you are selling products for profit. The £1,000 trading allowance means that if your total trading income from all self-employed activity is £1,000 or less in a tax year, you may not need to register for Self Assessment for that income.

Once your total trading income goes over £1,000, you usually need to:

• Register for Self Assessment with HMRC.
• File a tax return each year.
• Pay Income Tax and National Insurance on your taxable profit.
• Keep proper business records.

You can register through HMRC's Self Assessment registration page.

What counts as Amazon FBA income?

All income connected to your Amazon FBA business should be recorded, including:

• Product sales across Amazon marketplaces.
• Sales from UK, EU, US or other Amazon stores.
• Amazon reimbursements or adjustments.
• Promotional rebates or seller incentives.
• Any other income connected to the FBA business.

You record gross sales first, then deduct allowable expenses to calculate taxable profit.

How Much Tax Do Amazon FBA Sellers Pay?

The amount of tax depends on your total income, expenses, business structure and whether you trade as a sole trader or limited company.

Income Tax for sole traders

If you trade as a sole trader, Amazon FBA profit is added to your other taxable income. The standard Personal Allowance is £12,570. For England, Wales and Northern Ireland, Income Tax is charged at 20%, 40% and 45% depending on your total taxable income. Scotland has different Income Tax bands.

You can check current rates on GOV.UK's Income Tax rates page.

National Insurance

Self-employed sellers may also pay National Insurance on profits. Class 4 National Insurance is charged on profits above the lower profits limit, and voluntary Class 2 may be relevant if you want to protect your National Insurance record.

HMRC explains the current rules on its self-employed National Insurance page.

What Expenses Can Amazon FBA Sellers Claim?

You do not pay tax on total sales. You pay tax on profit, which means sales minus allowable expenses. For Amazon FBA sellers, expenses are usually substantial and need to be tracked carefully.

1. Inventory and product costs

• Wholesale purchases from suppliers.
• Manufacturing costs for private label products.
• Product samples and sourcing costs.
• Import duties and customs fees.
• Product compliance testing and certifications.

2. Amazon fees

• FBA fulfilment fees.
• Referral fees.
• Professional seller subscription fees.
• Storage and long-term storage fees.
• Removal, disposal and return processing fees.

3. Shipping, freight and prep

• International shipping from suppliers to Amazon warehouses.
• Freight forwarding costs.
• Customs clearance fees.
• Shipping from prep centres.
• Third-party warehouse and prep centre fees.
• Labels, barcodes and packaging compliance costs.

4. Advertising and marketing

• Amazon PPC, including Sponsored Products, Sponsored Brands and Sponsored Display.
• Amazon DSP advertising.
• External ads such as Google, Meta or TikTok.
• Influencer partnerships.
• Product photography and videography.
• Graphic design for listings, A+ content and packaging.

5. Software and subscriptions

• Inventory tools such as SoStocked, RestockPro or similar.
• Product research tools such as Helium 10 or Jungle Scout.
• Accounting software such as Xero or QuickBooks.
• Amazon reconciliation tools such as A2X.
• Repricing tools.
• Review, email or customer service tools.

6. Professional services

• Accountancy and bookkeeping fees.
• Legal fees related to trademarks, contracts or disputes.
• VAT consultant fees.
• Product compliance and certification advice.
• Business coaching or consultancy directly related to your FBA business.

7. Home office, storage and travel

• Home office costs where you manage the business from home.
• Office equipment and furniture used for the business.
• Storage units where you hold inventory before sending to Amazon.
• Mileage to suppliers, trade shows, prep centres or business meetings.
• Accommodation and meals for qualifying overnight business trips.

HMRC's general guidance on self-employed expenses is a useful starting point.

Inventory Accounting and COGS

Amazon FBA sellers need to be especially careful with inventory accounting. Stock is usually treated as an asset until it is sold. The cost becomes part of cost of goods sold when the item is sold, not necessarily when you buy the stock.

This means a simple bank account view can be misleading. You might spend heavily on inventory in one month but only claim the cost as stock sells through. Proper bookkeeping should track:

• Opening stock.
• Purchases during the period.
• Units sold.
• Closing stock.
• Cost of goods sold.
• Amazon fees, refunds and reimbursements.

When Do You Need to Register for Self Assessment?

You should register for Self Assessment by 5 October after the end of the tax year in which you first needed to file.

The online tax return and payment are usually due by 31 January after the end of the tax year. Paper tax returns have an earlier deadline.

If you are already trading and over the threshold, register as soon as possible rather than waiting.

Do Amazon FBA Sellers Need to Register for VAT?

Many serious Amazon FBA sellers eventually need to register for VAT. UK VAT registration becomes compulsory when taxable turnover goes over the VAT registration threshold in any rolling 12-month period, or if you expect to exceed the threshold in the next 30 days alone.

The current UK VAT registration threshold is £90,000. HMRC explains the current rules on its VAT registration guidance.

Once registered, you usually need to:

• Account for VAT on taxable UK sales.
• Submit VAT returns.
• Keep digital VAT records.
• Use Making Tax Digital compatible software.
• Reclaim VAT on eligible business purchases.

EU VAT and overseas marketplaces

If you sell through EU Amazon marketplaces or store stock in EU fulfilment centres, you may have overseas VAT obligations. This can involve import VAT, local VAT registrations, marketplace deemed supplier rules, OSS/IOSS rules and country-specific compliance.

Cross-border Amazon VAT can get complicated quickly, so get advice before sending stock overseas or enabling pan-EU fulfilment.

Should Amazon FBA Sellers Set Up a Limited Company?

Many FBA sellers start as sole traders. As profits grow, a limited company can become worth considering.

Possible benefits

• Corporation Tax can be lower than higher-rate Income Tax.
• Salary and dividends can give more planning options.
• Limited liability can help protect personal assets.
• A company can look more established to suppliers.
• Profits can be retained in the company for stock and growth.

Trade-offs

• More admin and bookkeeping.
• Company accounts and Corporation Tax returns.
• Payroll and dividend planning.
• Companies House filings.
• Higher accountancy fees.

Corporation Tax rates depend on company profits. You can check the current rates on GOV.UK's Corporation Tax rates page.

What Happens If You Do Not Declare Amazon Income?

HMRC takes undeclared online seller income seriously. Marketplaces and payment providers can share information with tax authorities, and Amazon records are detailed.

If you should have registered or filed a tax return but did not, HMRC can charge penalties, interest and tax for earlier years. It is usually better to come forward voluntarily than wait for HMRC to contact you.

Top Tips for Amazon FBA Tax Compliance

1. Keep accurate records

Track sales, refunds, fees, reimbursements, inventory purchases, freight, customs, advertising and software. Use accounting software that can handle Amazon data properly.

2. Use the right integrations

Xero or QuickBooks can work well with tools such as A2X to reconcile Amazon settlements. This is much cleaner than trying to manually decode every Amazon payout.

3. Separate business and personal finances

Use a dedicated business bank account. It makes bookkeeping easier and keeps records cleaner if HMRC ever asks questions.

4. Set money aside for tax

A rough starting point is saving 30% to 40% of profit for tax, depending on your structure, income level and VAT position. Your exact percentage may be lower or higher.

5. Understand inventory accounting

Do not treat all stock purchases as immediate profit deductions without checking the accounting treatment. Cost of goods sold needs to match stock sold.

6. Get specialist help

Amazon FBA accounting has more moving parts than most online selling. A specialist accountant can help avoid mistakes with VAT, COGS, settlements and cross-border sales.

Ready to Get Your Amazon FBA Taxes Sorted?

At Simplr Accounting, we specialise in helping UK Amazon FBA sellers stay HMRC-compliant and keep more of what they earn.

Whether you are just starting out or scaling a serious e-commerce business, we can handle your Self Assessment, VAT returns, bookkeeping and tax planning so you can focus on growth.