Guide 36 · Earn and redemption
When to cap earning and stop promotion stacking
Cap earning when the cost of the points a member earns can exceed the margin on the spending that earns them, usually in low-margin categories or for a few very heavy earners. Stop promotions stacking by allowing one promotional boost on top of the base earn rate and setting a maximum combined promotional value per member per period. Publish both rules before balances build up, and never apply them to points already earned.
Generous earning is easy to launch and hard to take back. Usually it is affordable, because ordinary members buy in categories with healthy margins. The problems come from the edges: a category where margins are thin, a member who spends far more than anyone planned for, or three promotions that all apply to the same basket. Earning caps and promotion stacking rules deal with those edges: a cap limits how many points a member can earn, and a stacking rule decides which promotions can combine on one purchase. This guide covers when you need each, how to apply them to points and coupons, and how to introduce them without damaging trust.
Why cap
Why would a program cap earning?
Because every point issued is a future cost. If the cost of the points a purchase earns is higher than the margin on that purchase, each extra sale makes the member less profitable. A hypothetical example: a program gives 2 points per dollar and each point costs 1 cent to redeem, so it gives back 2% of spend. A business member spends $50,000 in a year on goods with a 1.5% gross margin. The points cost $1,000; the margin is $750. Without a limit, the program loses $250 on its biggest customer before any other cost.
That is rare across a whole program, but common in pockets: low-margin categories, bulk buyers and purchases that are easy to resell, such as gift cards or electronics.
The margin test
How do you know whether you need a cap?
Compare the cost of points per dollar with the margin per dollar, category by category. Multiply the earn rate by your average cost per redeemed point, adjusted for the share of points you expect to be redeemed. That gives the loyalty cost per dollar of spend. Then compare it with the gross margin per dollar after payment and fulfillment costs.
- If the loyalty cost is well below margin everywhere, you may not need a cap on ordinary earning. Watch the top earners instead.
- If it approaches or exceeds margin in some categories, cut the earn rate there or cap earning in those categories.
- If it exceeds margin on average, the problem is the earn rate itself, and a cap would only hide it. See how to set loyalty earn rates.
Use actual redemption behavior, not the face value of points, when you set the numbers.
Types of cap
What kinds of cap are there?
| Cap type | How it works | Best for |
|---|---|---|
| Per transaction | Points stop above a set basket value | Bulk or business buyers |
| Per member per period | A maximum number of points a month or year | Limiting total exposure per account |
| Per category | Lower or no earning in named categories | Thin-margin items, gift cards, items easy to resell |
| Per promotion | Each offer has its own maximum bonus | Controlling campaign cost |
| Combined promotional | One limit on all bonuses together per period | Preventing stacking |
You will rarely need more than one or two of these. Set them well above what normal members spend, so they bite only where the economics require it.
What stacking is
What is promotion stacking, and why is it costly?
Stacking happens when several promotions apply to the same purchase and each adds its own boost. Many programs run bonus events alongside the base rate; Sephora, for example, gives 1 point per dollar and runs bonus point events with their own terms. The risk is overlap. If a double points offer, a category bonus and a bonus multiplier for a tier all apply at once, the member receives the total, and nobody planned for that total.
The cost is not only money. Members learn to wait for overlaps, so promotions shift purchases in time rather than create new ones. And because each campaign is planned separately, no one owns the combined figure.
The same applies to discounts. If a 5% member discount and a 10% coupon both apply to a $100 basket, the program gives away $15 of margin instead of $10, and the member is no more loyal than a single 15% offer would have made them. Stacking also makes reporting harder: when one purchase carries three promotions, it is difficult to say which one changed behavior, so every campaign looks more effective than it was.
Sources for this section
Beauty Insider Frequently Asked Questions (sephora.com) F-SEP-01
Stacking rules
How should you set stacking rules?
Start from one economic limit and work back. A practical set of stacking rules:
- The base earn rate always applies.
- On top of it, only one time-limited promotional boost applies per purchase: the most valuable one the member qualifies for.
- Tier multipliers, if you have them, are part of the base and not a promotion.
- Total promotional points per member per month cannot exceed a stated limit.
- Any exception, such as a deliberate bundle offer, is approved by finance and shown to members as one offer.
Test the rules against your three highest-volume promotions. Work out what a member who qualifies for all three would receive on a typical basket, with and without the rules. If you cannot state the maximum combined value per member in one sentence, the rules are not finished. Check before launch that your promotion engine can enforce priorities and limits.
Coupons and returns
How do coupons, discounts and returns affect points?
Coupon stacking and points stacking are the same problem seen from two sides. When a coupon, a member discount and a points promotion all apply, decide three things in advance.
- The earn base. Award points on the amount the member actually paid, after coupons and discounts, unless you have priced the points for the full price. Earning on the pre-discount price quietly adds the points cost on top of every coupon.
- The order of application. Apply discounts in a fixed sequence, for example fixed amount off first, then percentage off, then points on what remains. The same basket must always produce the same result.
- Which offers are exclusive. Mark each promotion as combinable or exclusive. Program benefits members are promised, such as base earn, should always apply; time-limited offers should not combine with other exclusive offers.
Returns need a rule as well. When an item is returned, reverse the points it earned, including any promotional bonus, and recalculate a threshold bonus if the return takes the basket below the threshold. Without that, buying to trigger a bonus and returning the goods is free points.
Add caps fairly
How do you add caps without losing trust?
Put caps and stacking rules in the terms from the start, even if the limits are generous. Adding a cap later, after members have planned around uncapped earning, is a material change: give notice, explain the reason and apply it only to future earning. Never remove points already earned under the old rules. Tell members about a cap before it bites, for example with a message when they are close to a monthly limit, rather than letting points silently stop.
Explain the purpose in plain words. A limit with a stated reason, such as stopping abuse, is easier to accept than one that appears without explanation. Service agents should know the caps and the reason for them, and should be able to show a member how close they are to a limit.
Monitor
How do you monitor caps and promotions?
Report the top 1% of earners each month, how much they earned and in which categories. Report promotional points by campaign and the share of purchases where more than one promotion qualified. Watch for accounts that earn mostly on resellable items or on promotions alone; those patterns often overlap with abuse, covered in loyalty fraud: types and defenses. Review the limits each quarter with finance and adjust them with notice, not quietly.
More answers
Frequently asked questions
What is an earning cap?
A limit on how many points a member can earn in a given transaction, period or category. Above the cap, purchases still count as normal sales but earn no more points, or earn at a lower rate.
What is promotion stacking?
When two or more promotions apply to the same purchase and their effects add up, for example a double points offer and a category bonus at the same time. Without a rule, each offer calculates its own boost and the member receives the total.
Do earning caps upset members?
Caps that are published from the start and set well above normal spending rarely affect ordinary members. Caps introduced suddenly, or applied to points members already planned around, cause the most complaints.
Should the base earn rate be capped?
Usually not on ordinary purchases if the earn rate is affordable across your margins. Caps are more useful on specific categories with thin margins or a risk of abuse, such as gift cards, and on promotions.
Do members earn points on the discounted price?
It is your choice, but write it down. Earning on the amount actually paid, after coupons and member discounts, keeps the cost of points in line with the margin you keep. Earning on the full price makes stacked coupons and points more expensive than either looks alone.
Are caps a fraud control?
Partly. Caps limit how much any single account can earn, which reduces the damage from abuse such as buying gift cards to farm points. They do not replace fraud monitoring, which looks for patterns across accounts.