Blog · 5 October 2026 · AffWorth team

How to set a max CPC for an affiliate coupon campaign

Every affiliate who buys paid-search traffic hits the same question before the first click: how much can I pay for one click and still make money? Google's bid estimates don't answer it. They tell you what other advertisers pay, not what a click is worth to you.

This is the rule we use on our own campaigns, with the numbers that made us adopt it.

The formula

commission per order = average order value × commission rate × (1 − cancellations)
value of one click = commission per order × conversion rate
max CPC = value of one click × 0.5

The first two lines give your break-even bid: pay that per click and you get your money back, no more. The last line is the bid you actually set. It keeps half of each click's value as margin.

Why bid only half of break-even

Conversion rates swing. With 10 to 30 clicks, one order more or less halves or doubles the rate. You don't know your real rate until you've paid for it.
Commission isn't final when it shows up. Orders get cancelled, refunded or reversed. We take 10% off for this in the formula, and some programmes reverse more.
Automatic bidding overshoots. We once lost $55 in a single day when an automatic bid strategy replaced manual CPC on a batch of campaigns. Since then: manual CPC, a hard daily budget, and a ceiling that leaves room for error.

Our baseline across coupon campaigns (2026)

Measure	Value
Conversion rate on coupon-intent clicks	about 8% (10–15 clicks per order)
Commission per order, typical	$10–20, about $15 on average
Value of one click at those numbers	about $1.20
CPC actually paid with a $0.50 cap	about $0.27
Typical return on ad spend	3–5×

Source: our own campaigns that had both ad spend and approved commission, summarised in August 2026. These came from programmes we picked by hand, so treat them as a reference, not a promise.

Two worked examples

Both are programmes we checked or ran in September–October 2026. We don't name them, because these are campaigns we still run.

A seasonal home-décor brand

21 orders tracked in the affiliate dashboard: $1,137 in sales, $63.92 commission, so $3.04 per order. The rate isn't one number: some orders paid 10% and others only 2%. That's why we average the commission you were actually paid rather than trusting the headline rate.

value of one click = $3.04 × 8% = $0.24
max CPC = $0.24 × 0.5 = $0.12

Google's top-of-page bids for "brand + coupon code" were $0.70–2.00. Bidding there loses money on every click, however good the ad is. Plain brand-name keywords were $0.15–0.31, and a short test at $0.10–0.15 came back at roughly four times its spend (commission still pending). The bid ceiling told us which keywords to keep before we spent anything on the expensive ones.

A tablet-case brand on 5% commission

Two tracked orders of $18.99 and $32.99 paid $0.95 and $1.65, about $1.30 per order.

value of one click = $1.30 × 8% = $0.10
max CPC = $0.10 × 0.5 = $0.05

The brand keyword's bid range started at $0.35, and Similarweb put about a third of the brand's own traffic down to its own search ads (August 2026). A $0.05 bid might pick up a few cheap clicks and a few dollars a month. For this one we write a page that ranks instead of buying clicks.

Checklist before you set a bid

Commission per order in dollars, not the percentage. Some programmes pay two different rates. Use what was actually paid on past orders if you have them.
The bid range of the exact keywords you plan to buy. "Brand + coupon" is often several times dearer than the brand name alone.
Seasonality. A seasonal brand can see ten to twenty times more searches in its peak month than in the rest of the year. Your budget should follow that curve.
The programme's terms. Many programmes ban bidding on their brand name. Read the sentence yourself before the first click. We lost an account and an unpaid $124 commission by skipping this.

Check a programme before you spend on it

AffWorth shows commission per order, the break-even bid and the real brand-keyword bid for each programme. 100 rows a day are free, no account needed.

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