Costs and pricing
Part of What do affiliate marketing costs and pricing look like for a UK brand?
Six affiliate marketing hidden costs that catch out English teams
Six affiliate marketing hidden costs English teams miss, from VAT partial exemption to voucher code liability, with labelled figures and links to the rules.
What to take away
- The mistake most teams make is budgeting only commission and platform fees, then finding VAT recovery, voucher code liability and reversals take a further cut.
- VAT partial exemption changes the real cost of a programme, so read the GOV.UK guidance on VAT exemption and partial exemption before signing a network contract.
- Advertising rules apply to affiliate activity, and the ASA's trading standards referrals page shows how enforcement risk turns into cost.
- Affiliates who monetise review pages with Google AdSense must follow its ad placement policies, and a removed page wastes the spend behind it.
- Build the numbers in writing first, using the affiliate marketing budget template in England to structure them.
How the six costs arise after launch
Each cost below appears after launch rather than in the initial quote, and every figure is in pounds sterling. The geography is England, with UK-wide rules flagged where they apply. Nothing is ranked by size, because the amount depends on your category and contract.
How the six costs arise
| Cost | Assumption | Timing |
|---|---|---|
| VAT partial exemption | UK standard VAT rate of 20 per cent; a fifth irrecoverable in the example | Recurring monthly |
| Voucher code liability | 8 per cent commission rate in the example | Recurring monthly |
| Ad placement and trademark compliance | No fixed rate; depends on brand bids and policy breaches | Recurring monthly |
| Enforcement and trading standards risk | No fixed rate; depends on complaint volume | One-off or recurring |
| Low-quality traffic and reversal costs | 6 per cent reversal rate in the example | Recurring monthly |
| Internal management time | £1,400 a month for a part-time coordinator | Recurring monthly |
Indicative total: VAT and reversals alone give a floor of 10 per cent of commission spend. A typical planning range is 15 to 30 per cent once voucher and compliance costs are included.
The £1,400 coordinator adds 7 per cent at £20,000 monthly commission, so the combined range is about 22 to 37 per cent. The range depends on VAT recovery, reversal rate, voucher share and contract terms.
The 8 per cent commission, 6 per cent reversal and £1,400 coordinator figures are planning assumptions in this article, not published market averages. Replace them with your own contract, returns and payroll data.
1. VAT partial exemption and mixed supplies
If you make both taxable and exempt supplies, you cannot automatically recover all VAT on affiliate commission or software. The linked guidance explains when a special method is needed.
A retailer with exempt financial services alongside taxable goods might recover only part of its input tax. For example, a team paying £3,000 a month in commission could find a fifth of the VAT on that spend is irrecoverable.
At the UK standard VAT rate of 20 per cent, £3,000 of commission carries £600 of VAT. If a fifth is irrecoverable, that is £120 a month, so £480 is recoverable. The £120 equals 4 per cent of the commission spend.
2. Voucher code and discount liability
Affiliates often earn commission on sales that would have happened anyway, especially when they publish voucher codes at checkout. Commission is paid, the discount applied, and the margin vanishes twice.
A programme paying 8 per cent commission on a £60 order pays £4.80 per sale on top of the discount. At scale that can exceed the platform fee. Contract terms should state whether commission is paid on discounted baskets.
3. Ad placement and trademark compliance
Affiliates bidding on your brand terms can raise your cost per acquisition. If an affiliate page breaches Google's ad placement policies, the page can be removed and the traffic lost. The cost is wasted spend plus the management time spent policing it. Monitoring is a recurring monthly cost, not a one-off recruitment task.
4. Enforcement and trading standards risk
Advertising claims made by affiliates are still your claims. The ASA can refer persistent non-compliance onward, which brings legal and administrative cost. A single upheld complaint is cheap to fix. A pattern of complaints is not. Compliance review, training notes and a takedown process are recurring monthly costs.
5. Low-quality traffic and reversal costs
Networks charge on tracked sales, but returns, cancelled orders and fraudulent transactions still cost you. If 6 per cent of affiliate sales are later reversed, a programme reporting £20,000 in monthly commission is paying on revenue it never kept. Set a reversal threshold in the contract and reconcile monthly.
6. Internal management time
Someone must approve publishers, check creative, reconcile invoices and answer affiliate queries. A part-time coordinator at £1,400 a month is a legitimate programme cost.
Teams omit it because it sits in salaries, not the affiliate budget. It is a recurring monthly cost. The £1,400 figure is a planning assumption for a part-time role, not a published salary benchmark. The affiliate marketing costs and budget guide for England maps the rest.
Glossary
VAT partial exemption example
£3,000 monthly affiliate commission
A fifth of VAT on that spend irrecoverable
Mixed taxable and exempt supplies
Special method may be needed
- Partial exemptionthe VAT rule limiting recovery of input tax where a business makes exempt supplies.
- Reversala sale later cancelled or returned, on which commission may still be due.
- Voucher code liabilitycommission paid on a sale that used a discount code, cutting net margin twice.
- Trademark biddingaffiliates bidding on brand terms in paid search.
Common questions
Do these costs apply across the UK?
VAT is a UK-wide tax, so partial exemption applies in Scotland, Wales and Northern Ireland as well as England. ASA enforcement also operates across the UK. Contract terms and platform pricing can differ by market.
How should I estimate the hidden cost?
Start with commission and platform fees, add a percentage for reversals, a proportion for irrecoverable VAT, and a fixed monthly figure for management time. Your accountant can confirm the VAT position for your supplies.
Can I avoid these costs entirely?
No. Clear contract terms, monthly reconciliation and a compliance process reduce them. Treating them as zero is the mistake that makes a programme look profitable when it is not.
