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How high the discount, bid, or commission for bringing them in can go
You'll learn to think of the welcome discount, the ad bid, and the referral commission as parts of one single cap per customer, not as three separate costs that add up.
By Yodai · Published September 6, 2026 · Updated October 12, 2026
There's a maximum you can spend to bring in a new customer without losing money on them. We call it the ceiling, and it comes from what that customer brings you in a year, minus the margin you want to keep. But that number alone doesn't decide anything.
A new customer comes in and you have to write a welcome coupon with an exact figure. You launch an ad campaign and you have to set a bid cap. Someone offers to bring you customers for a commission and you have to name a percentage. The ceiling tells you how far you can go. It doesn't tell you what figure to write today in each of those three spots, and that's where most people freeze up or wing it.
Same ceiling, three different decisions
The ceiling doesn't get handed out in full to whichever channel asks for it first. If your ceiling is $30, that doesn't mean you can give a $30 welcome discount and also pay a $30 bid for that same click and also promise a $30 commission to whoever brought them in. That $30 is the total limit that customer can cost you, no matter how many steps their path took to reach you.
The practical rule: before you launch anything, decide which channel is going to spend the ceiling that month. If the customer comes in through an ad, it's the ad that gets the room to work with. The welcome coupon, if there is one, comes out of that same budget. It doesn't get added on top.
The ceiling changes with the business
The higher the average sale and the more loyal the repeat customer, the higher the ceiling, and the more room you have to split between a coupon, an ad, and a commission. In the clothing store example, with a $12 ceiling, there's no room to do all three at once: you have to pick one and skip the other two that month. In the gym example, with a $60 ceiling, there's room for a modest coupon plus a decent commission, as long as the two together don't go over the limit.
The welcome discount: set the number, not just the gesture
A welcome discount that sounds generous without checking the ceiling is the cheapest mistake to make and the most expensive one to keep making. If your ceiling is $30 and that customer is also going to cost you an ad bid or a commission, the coupon can't come anywhere close to the full $30: give it a slice.
And the number alone isn't enough: it needs a deadline and a condition, or it turns into the everyday price for everyone.
The ad bid
There are two ways to bid in a campaign, and they don't work equally well depending on where you are in the process.
- You pay every time someone clicks the ad, whether they buy or not, so you can launch it on day one with no history behind you
- You only find out the real cost per customer at the end of the month, once you've already spent the money
- You tell the platform how much you want to pay on average for each sale or booking, and it adjusts the bid on every click to get close to that number. Except in some display campaigns, you still pay per click
- You can set that target equal to your ceiling, but it's an average: some sales will cost you more and others less
- It needs you to track sales or bookings, and it learns from the campaign's history: with few conversions recorded, it has little to learn from
Which one do I choose: If you've been running the campaign for less than a month, start with pay-per-click and a low daily cap, just to gather data. Once you have real conversions from three or four weeks, switch to cost-per-conversion bidding and set the target exactly at your ceiling, even if the platform suggests raising it.
The referral commission: paid when the customer pays
You pay whoever brings you customers once the customer has paid, not when they just introduce you. A few clear words when you agree on it are enough, something like telling them you'll give them twenty percent of the first purchase they bring in, paid the week the customer pays, not before. The commission comes out of the same ceiling. If it's the only channel that brought that customer in, it can go up to the full limit; if there was also a coupon or an ad involved, it gets split with them.
A twenty percent commission on a $35 purchase is $7: if your ceiling is $30, that still leaves room for a little extra something. The same twenty percent commission on a $200 package is $40: that alone puts you over the ceiling before you spend anything else to land the customer. The percentage doesn't change, but the sale amount does, and that shifts the whole result.
- You know the ceiling is a total, not a number that repeats on every channel
- You have the welcome coupon written out with its exact figure and expiration date
- You know when to bid per click and when to switch to bidding per conversion, with the target set at your ceiling
- You know how to agree on a referral commission with whoever brings you customers, and you pay once the payment comes in, never before
- You have the rule for not stacking discount, ad, and commission beyond what you can afford per customer
Test yourself
Answer before opening each one. If one gives you trouble, go back to the section that explains it.
1. Your ceiling per new customer is $25. A customer comes in through an ad campaign that cost you $18 in bids, and on top of that you send them a $10 welcome coupon. What do you do?
Nothing, you've already gone over: $18 plus $10 is $28 on a $25 ceiling. The coupon should have come out of that same $25, not been added on top; for the next campaign, drop the coupon to $5 or skip the bid on that channel.
2. You've had a new campaign running for two weeks and still have no recorded conversions. A colleague tells you to switch to cost-per-conversion bidding now, with the target at your ceiling. Do you do it?
No. With two weeks and no conversions, the platform doesn't have the data to aim well; stay on cost-per-click with a low daily cap until you've built up three or four weeks of real conversions, and switch then.
3. A customer refers you another customer who buys a $200 package, and you promised them a 20% commission. Your ceiling per new customer is $30. Do you pay the full commission and also send the new customer a welcome coupon?
You pay the full $40 commission because you promised it, but that's where you recognize the problem: $40 already exceeds your $30 ceiling, so there's no room for any extra coupon; for the next referral at that price point, you'll need to lower the commission percentage or raise the ceiling by reviewing your margin.