TL;DR: Cashback websites earn a commission every time you buy something after clicking through their link. They keep a slice and pass the rest back to you as cashback. The money ultimately comes from the retailer’s marketing budget, more specifically, the bit they’d otherwise spend on Google Ads or Facebook to find you. There’s no catch, no hidden fee on your purchase, and no reason it should feel sketchy. But how the slice is divided varies wildly between sites, and that’s where it gets interesting.

Somewhere in a spreadsheet at every online retailer sits a line item for customer acquisition. It pays for the Google Ads auction. Some of it funds the Meta retargeting campaign that trails you for a fortnight after you glance at a pair of trainers. A slice reaches the YouTuber reading a script about a VPN.

The same line item pays your cashback.

That is the whole trick, and the industry has spent twenty years being slightly vague about it. Retailers hand affiliates a commission on every sale they refer. Cashback sites are affiliates who split that commission with the customer instead of keeping it. Your checkout price does not move by a penny either way, because the retailer books the payment as marketing spend, not as a discount.

So the model is boring and legitimate. The interesting bit, the bit worth twenty minutes of your attention, is how the industry divides the money after it changes hands.

Follow the commission

Picture a software company paying 30% commission on a new subscription. Three parties touch that money: the affiliate network handling the tracking, the cashback site that sent the click, and you.

Most explainers claim the network takes a bite out of the middle. They have the plumbing backwards. On Awin, CJ and most established networks, the merchant pays publisher commission plus a network override on top, frequently around a third of the commission value again. Contracts vary and a few programmes structure it differently, but as a rule the cashback site banks the advertised commission in full.

Strip out the noise and one variable decides what reaches your account: how much the cashback site keeps.

Nobody publishes that number. In practice it ranges from zero to well past half. TopCashback built a brand on passing the full merchant commission to members and earning its money elsewhere, through premium memberships, gift card uplifts and on-site advertising. Plenty of competitors quietly pocket a large share and advertise a rate that still looks generous, because the underlying commission was fat to begin with.

Neither approach is dishonest. What should bother you is that from the outside, the two are indistinguishable.

Why software pays a fortune and Amazon pays pennies

Chasing the site with the best pass-through rate misses the point. Category matters more, by roughly an order of magnitude.

  • Software and digital subscriptions. The most generous corner of the entire affiliate economy, routinely in the tens of percent, and increasingly paying out on renewals as well as the first invoice.
  • Web hosting and cybersecurity. Comparably rich, though usually structured as a flat fee per signup rather than a percentage.
  • Finance and fintech. Flat bounties per approved application, occasionally eye-watering ones for brokerage and credit products.
  • Travel. Mid single digits to low double digits, depending on hotels versus flights versus packages.
  • Fashion and beauty. Low double digits at most brands, a shade higher for premium beauty.
  • General retail. Low single digits at the big chains, and that is the ceiling.
  • Amazon. Pennies. Low single digits across most physical categories, with electronics and groceries scraping the bottom.

Blame the unit economics. A software company adds a customer at almost no marginal cost and expects to keep that customer for well over a year, so surrendering most of month one to acquire them still clears comfortably. Supermarkets shifting physical goods on wafer margins cannot play that game. Amazon does not need to, because the entire internet links to Amazon regardless.

Do the arithmetic and the ranking inverts. A site keeping half the commission on a software purchase still pays you more than a saintly site keeping nothing on a garden hose. Judge the rate that lands, not the generosity anyone claims.

The bit almost nobody builds for: renewals

Cashback platforms treat a purchase as an event. Click, buy, track, pay once, done. That logic came from retail, where it makes perfect sense, because nobody re-buys the same kettle every month.

Subscriptions break the model. Spend £40 a month on a marketing platform and the sale you made in January is still generating revenue for that company in December. Software companies noticed, and a growing number now pay affiliates on that recurring revenue rather than the first invoice alone, on the reasonable grounds that the affiliate keeps earning it.

Here is the gap. Where a merchant pays recurring commission and renewals flow through tracked infrastructure, nothing stops a cashback site paying you every single month for years. Almost none of them do. They built their systems for one-off retail transactions, and retrofitting recurrence is genuine engineering work in a category they do not care about.

We built Rewardio around that gap, and the limits deserve stating plainly. Recurring cashback only exists where the merchant runs a recurring commission programme. Plenty do not, and on those merchants you get one payment, exactly as you would anywhere else, which is why each merchant page carries its own recurrence status rather than a blanket promise.

Our cut is roughly half the commission. An article that ends by telling you to interrogate your cashback site cannot then dodge the question itself. Half a subscription commission arriving every month indefinitely beats all of a 2% retail commission arriving once, and that comparison is the argument. Anything dressed up beyond it would be marketing.

Why your money takes four months to arrive

Everyone complains about the wait. Most of it is structural rather than anyone sitting on your balance for fun.

The retailer reports your sale to the network within a day or two. Then a validation window opens, typically 30 to 90 days, while the retailer waits to see whether you send the thing back or dispute the charge. Any merchant only has to pay commission on a refunded order once before deciding to hold funds. Once the window closes, the network settles with the cashback site, and the site settles with you.

Sixty to a hundred and twenty days from purchase to withdrawable counts as normal. Longer happens constantly.

Minimum withdrawal thresholds are a different animal, and nothing about them is structural. A site that traps your balance until it reaches £25 while paying you pennies per transaction has designed a machine that never pays out, and somebody chose that. Read the threshold before you read the headline rate.

Last click wins, which suits cashback sites nicely

Affiliate networks overwhelmingly run on last-click attribution. Whoever delivered the final click before checkout collects the entire commission, no matter who did the persuading.

Consider what that rewards. The reviewer who spent three weeks testing the product and convinced you to buy it earns nothing, provided you pass through a cashback site or a voucher extension on your way to the payment page. Cashback sites, coupon sites and browser extensions therefore capture a share of affiliate revenue wildly out of proportion to their influence, and creators have been complaining about it, loudly and correctly, for a decade.

For you it collapses into one rule: make the cashback click the last thing you do before paying.

Which rules out nipping back to Google to sanity-check the price, clicking the discount pop-up the merchant fires at you, opening a comparison tab, and pasting in a voucher code you found elsewhere. Each of those overwrites the tracking, and your commission wanders off to somebody else.

Even flawless behaviour fails sometimes. Ad blockers strip the cookie, privacy settings refuse it, you start on your phone and finish on a laptop. Any site worth using runs a missing cashback claim process. Confirm it exists before you trust the site with an expensive purchase.

Three questions worth asking

Twenty years in, the model itself is settled. Individual operators vary enormously, and three questions sort them out fast.

What share of the commission do you keep? Hardly anyone answers. The silence tells you plenty.

What stands between me and a withdrawal? Minimum thresholds, inactivity clauses, payout methods. All of it sits in the terms, and all of it matters more than the rate on the homepage.

What happens when tracking fails? Either a claims form and a stated response time, or a shrug.

Point all three at us as readily as at anyone else.

Common questions

Does cashback affect the price I pay? No. Your checkout total reads identically whether you arrive through a cashback site or type the URL yourself, because the retailer funds the commission from its marketing budget.

Is cashback a discount or a refund? Technically neither. You are receiving a share of a marketing commission, which explains both the months-long delay and the fact that it can vanish.

What happens to my cashback if I return the purchase? The merchant claws back the commission and your cashback reverses with it. Every platform works this way. One that promised otherwise would be paying you out of its own pocket.

Can I use a voucher code and still get cashback? Sometimes, but only codes the cashback site lists itself. Codes from elsewhere carry their own tracking and will hijack the click, and merchants routinely exclude discounted orders from commission anyway.

Is any of this legal? Entirely. Most large retailers worldwide run affiliate programmes, and the arrangements between merchants, networks and publishers amount to ordinary commercial contracts.

Why did my cashback track lower than the advertised rate? Merchants tier their commission by product and category, and the headline figure usually reflects the top tier. Sale items, gift cards and subscription upgrades tend to pay less or nothing at all. Check the exclusions on the merchant page before you buy.