Affiliate Marketing In The UK 2026: Tax, ASA Disclosure Rules And Best Networks

Quick answer: Affiliate marketing in the UK means earning commission when readers buy through your links, usually via networks such as Awin or Amazon Associates UK. HMRC treats the income as trading income: the first £1,000 a year is covered by the trading allowance, and above that you must register for Self Assessment. The ASA and CAP Code require you to label affiliate content clearly, for example with “#ad” or “affiliate link” before the link.

The UK has one of the most mature affiliate markets in the world, with a long list of high-street retailers, banks, energy suppliers and travel brands running programmes. That also means competition is strong, so compliance and quality matter.

This guide covers how to start, which networks to use, how tax works and how to stay on the right side of the ASA.

How Affiliate Marketing Works In The UK

You publish content, add tracking links and earn commission on qualifying sales or sign-ups. Retailers typically pay a percentage of the sale, while finance, broadband and energy brands often pay a flat fee per customer.

Most UK brands run their programmes on a network, so joining one or two networks gives you access to hundreds of programmes through one account and one payment.

Best Affiliate Networks In The UK

For a closer look at the biggest UK network, read our Awin review.

Tax On Affiliate Income In The UK

HMRC treats regular affiliate commission as trading income. Every individual has a £1,000 trading allowance each tax year, from 6 April to 5 April. If your total gross trading income from all side activities stays under £1,000, you do not need to tell HMRC or pay tax on it.

Once your gross trading income goes over £1,000, you need to register for Self Assessment and file a tax return. You then choose either to deduct the flat £1,000 allowance or to deduct your actual business expenses, such as hosting and software, but not both. The allowance is a single limit across all your side income, not one per platform.

Very large affiliate businesses also need to watch the VAT registration threshold. This guide is general information, so speak to an accountant about your situation.

ASA And CAP Code Disclosure Rules

The Advertising Standards Authority enforces the CAP Code, which requires affiliate content to be obviously identifiable as advertising. In practice:

• Label before the link: Use “#ad” or “affiliate link” where readers will see it before clicking.
• Do not hide it: A disclaimer in the footer or a separate policy page is not enough.
• Social posts: Put #ad at the start of the post, not buried in the caption.
• Gifted products count: If a brand gave you a product with an expectation of promotion, label it.

The Competition and Markets Authority can also act on misleading marketing under consumer protection law.

How To Start Affiliate Marketing In The UK

1. Choose a niche with spending intent. Home, beauty, tech, travel and personal finance all perform well.
2. Build a site or channel. Publish helpful, original content first.
3. Join Amazon Associates UK. See our Amazon Associates UK guide.
4. Join Awin. Apply to UK brands that match your content.
5. Label every link. Follow ASA rules from day one.
6. Track your income. Keep records so you know when you cross the £1,000 allowance.

Frequently Asked Questions

Is affiliate marketing legal in the UK?

Yes, as long as you label affiliate content clearly and declare taxable income.

Do I pay tax on affiliate income under £1,000?

Generally no. The £1,000 trading allowance covers small amounts, as long as it is your only trading income.

Do I need to use #ad on blog posts?

You need a clear label before the link. “#ad” or “affiliate link” are both widely used.

Which affiliate network is best in the UK?

Awin has the deepest roster of UK brands, and most publishers pair it with Amazon Associates UK.

Conclusion

Affiliate marketing in the UK rewards publishers who pick a focused niche, join Awin and Amazon UK, label every link and keep simple records for HMRC. Get those basics right and the UK’s huge roster of brands becomes an advantage.

See our list of the best affiliate programmes in the UK or browse the affiliate programs hub.