How Cashback Really Works

Cashback is a share of a retailer's marketing commission passed back to you. Understanding that it is commission, not a discount, explains nearly all of its quirks — including why it takes months to pay, why claims fail, and why the headline rate is rarely the number you actually receive.

Where the money comes from

When you reach a retailer through an affiliate link, the retailer pays a commission on the resulting sale. A cashback site returns part of that commission and keeps the rest. Card-linked offers work differently: the retailer funds a statement credit through the card network, with no link-tracking involved — which is why they are so much more reliable.

The structure explains the delay, too: your cashback is provisional until the retailer's return window closes and the commission is confirmed, which is why "pending" lasts 30–90 days and partial returns reverse it proportionally.

A worked example, end to end

A €120 clothing order at an advertised 8% rate. Reality: the rate applies to the pre-tax, pre-delivery amount (€96 of the €120); a 10% coupon from the portal's own list drops the tracked basis to €86.40; cashback earned: €6.91, not the €9.60 the badge implied. Six weeks later one €30 item goes back — the cashback reverses proportionally to about €5.18, and pays out in month three. Meanwhile a pre-activated card offer ("€5 back on €75+") paid €5 unconditionally within days. Neither is bad — €10 back on a discounted order is real money — but the arithmetic shows the shape: cashback is a rebate on the netted amount, last in line, and reversible. The layering rules that keep every mechanism paid are set out in our stacking guide.

Why claims fail

The causes are mundane and almost entirely preventable:

1. Attribution broken by a coupon site — finding a code elsewhere after clicking through the portal overwrites the referral. Codes first, portal click last.
2. Ad blockers and strict privacy modes stripping tracking parameters — allowlist the portal or use a separate browser profile for purchases.
3. Session leaks — switching devices, reopening from an old tab, or wandering off to compare mid-checkout.
4. Excluded categories — gift cards and sale items are excluded almost universally; marketplace third-party sellers frequently.
5. The claim window missed — untracked transactions can usually be claimed with the order confirmation, but only within 30–90 days. Check tracking within a week, not at payout time.

Rates are not the whole comparison

A high rate at a retailer whose prices run higher is worth less than a modest rate somewhere cheaper — the comparison that matters is final cost after cashback against final cost elsewhere, never rate against rate. Elevated-rate promotions ("12% today only!") deserve the same scrutiny as any urgency device: they are real, but they are also designed to redirect purchases you would have made anyway at a retailer you would not have chosen. And a percentage back on an inflated base price is still a loss against an honest price elsewhere — the base price gets verified first, the usual way.

Using it sensibly

Treat cashback as a bonus on a purchase you had already decided to make at a price you had already judged acceptable — never as a reason to choose a dearer retailer, and very much never as a reason to buy at all. Practically: activate card-linked offers monthly in the banking app; find codes before clicking through; complete the purchase in one uninterrupted session; keep the confirmation email; verify tracking within days. Ten minutes of process, indefinitely repeated, is the entire skill.

Withdrawal thresholds are the last quiet detail: balances below a minimum can sit unpayable, which is a fine reason to prefer portals with low thresholds and card offers with none.

FAQ

Is cashback taxable? In most jurisdictions, personal-purchase cashback is treated as a discount rather than income — untaxed. Business purchases and bank switching bonuses can differ; check locally if the sums are meaningful.

Portal cashback or credit-card rewards — which is worth more? They stack, so it is not a choice: portal commission plus card rewards on the same transaction is the normal outcome of doing both. Card rewards are the reliable floor; portal cashback is the variable bonus.

Why do rates for the same retailer differ between portals? Different negotiated commissions and different margins kept. Comparing portals per purchase is rarely worth the minutes for small orders — pick one with fair rates and a low payout threshold, and spend the attention on the base price instead.