Retention / Referral
How to Structure Referral Rewards
// reward both sides, within your margin
By Fracto Solutions
October 31, 2026
The short answer
Structure referral rewards as two-sided (something for the referrer and the friend), sized to motivate without eroding margin. Store credit or a discount for both sides is the common, margin-friendly default; cash or gifts suit higher-value products. Reward only on a valid first purchase, and model the reward cost against the incremental customers it brings in.
Should the reward go to both sides?
Reward the friend at minimum. We used to say two-sided in almost every case, and the only field experiments that tested the three structures head to head do not support that. Adding a referrer-side reward on top of a friend-side one has not been shown to improve anything.
Gershon, Cryder and John ran eight experiments on this question, two of them with real companies. The results are specific enough to design from.
Reward goes to
GiftAMeal conversion (n=6,364 emailed)
Game Access conversion (n=1,438 delivered)
The friend only
0.94%
4.77%
Both sides (two-sided)
0.94% (p = .99 against friend-only)
Not reported separately
The referrer only
0.39%
1.71%
Nobody (control)
0.08%
0.61%
The paper’s own conclusion: the shared incentive “did not outperform the recipient-benefiting incentive.” Referrer-only is the structure that measurably underperforms.
So the ranking is friend-only and two-sided tied at the top, referrer-only clearly behind, and no reward at all far behind that. The mechanism the researchers propose is reputational: handing a friend a benefit is a comfortable thing to share, while asking a friend to help you earn a reward is not.
There is one condition under which the ranking changes, and it is worth knowing because it tells you when to keep a referrer-side reward. When sharing takes real effort, the researchers found the referrer-benefiting reward performed better, and when it takes little effort the friend-benefiting one did. If your share flow is a single tap, lead with the friend’s side. If referring genuinely costs your customer something, pay them for it.
A note on what we got wrong. An earlier version of this page contained a sentence describing one-sided rewards twice over, and its second half claimed that a friend-only reward “gives the referrer no nudge.” That was backwards: friend-only was the best-performing condition in both field experiments. We have removed it.
Discount, store credit, or cash?
Match the reward type to your margin and to what the reward is for. Store credit and discounts are the margin-friendly defaults; cash motivates but keeps nothing in the store. None of the types has a published performance comparison, so this is a cost decision rather than an effectiveness one.
Store credit has one structural advantage worth stating precisely: it is redeemed against a basket that carries margin, so you recover part of the reward value on the next order in a way a cash rebate does not. The caveat is that outstanding credit is deferred revenue on your books until it is redeemed, and in some US states unredeemed balances carry escheat exposure. It is cheaper than cash, not free.
Reward
Advantage
Watch for
Friend-side discount
Best experimental record; simple
Comes straight off the first order's margin
Store credit
Redeemed against a margin-bearing basket
Deferred revenue until redeemed
Cash
Strong motivator for the referrer
No repeat nudge; no measured advantage
Gift or product
Memorable and on-brand
Fulfillment cost; disclosure still applies
Tiered or milestone
Scales with your best advocates
The FTC's points-for-prizes example; disclose it
No published study compares these types on conversion. Choose on cost and on what you want the reward to do next.
How big should the reward be?
Size it against the total value of a referred customer, not against your paid acquisition cost. In the one case that has been measured properly, the reward was larger than the acquisition-cost saving and the program still paid.
At the German retail bank studied by Schmitt, Skiera and Van den Bulte, referrers received a EUR 25 voucher. The acquisition-cost saving on a referred customer was about EUR 20. On a strict cost-per-acquisition view, the reward exceeded the saving. The program paid anyway, because the referred customer delivered roughly 25% more margin over the 33-month window, was worth about 16% more on a six-year lifetime value basis, and churned at about an 18% lower hazard.
That is the model to copy: reward against value, and know which part of the value you are buying. The same study found the margin advantage shrinking by 23.1 cents per 1,000 days and disappearing after about 857 days, while the retention advantage did not erode. So a reward justified by margin has a payback window of roughly two and a half years, and a reward justified by retention does not, which is a reason to model the two separately rather than pointing at a single lifetime-value figure.
We previously advised keeping the reward “comfortably below what you’d pay to acquire the same customer through ads.” That is a reasonable heuristic and we have kept it as one, but it is not a finding, and the one measured case breaks it. Treat your paid CAC as a sanity check rather than the ceiling.
What do I have to disclose, and how do I stop fraud?
Disclose that the referrer is paid, reward only on a completed first purchase, and cap per account. The disclosure part is a legal requirement that referral advice routinely omits, including our earlier version of this page.
An incentivized referral is an endorsement with a material connection. Under the FTC Endorsement Guides at 16 CFR Part 255, effective July 26, 2023, payments, free or discounted products, early access and even a chance at a prize must be disclosed clearly and conspicuously, and Example 11 addresses referral and affiliate compensation directly. A tiered program where bigger rewards follow more referrals is structurally the Guides’ points-for-prizes example.
If you connect the reward to a review, a second and harder rule applies. The FTC’s Rule on the Use of Consumer Reviews and Testimonials, 16 CFR Part 465, effective October 21, 2024, prohibits incentives conditioned expressly or by implication on a review expressing a particular sentiment, at up to $53,088 per violation. Rewarding customers you selected for leaving a five-star review is inside that.
On fraud, be honest about what is known. We could not find a published referral-fraud incidence rate; the available material is vendor content without methodology. The nearest primary signal is that Gershon and Jiang’s 41.2m-customer analysis excludes suspected fraud without publishing the exclusion rate, which tells you fraud is material in real data and nothing about its size. Reward on a valid completed first purchase rather than a sign-up, cap rewards per account, and watch for self-referrals. One safeguard that does have research behind it: recruit referrers with at least six months of tenure, because referrers with under a month produced referrals whose margin fell below that of non-referred customers.
We size referral rewards as acquisition cost, two-sided and margin-aware.
We set two-sided rewards that feel worth sharing, keep them below your paid CAC, prefer store credit where it also drives repeat purchase, add fraud safeguards, and measure incremental customers against reward spend, so referrals acquire profitably.
It’s the same measurement-first approach behind our conversion optimization work, where we rebuild the buying path and measure the result .
// we would rather show up in your reporting than in your inbox
Frequently asked questions
Should referral rewards be two-sided?
Reward the friend at minimum. Across two field experiments, friend-only and two-sided converted identically (0.94% against 0.94%, p = .99 on 6,364 emailed customers), while referrer-only lagged at 0.39%, and at a second company friend-only beat referrer-only 4.77% to 1.71%. Keep a referrer-side reward where sharing takes real effort, since the ranking reverses under high action cost.
What type of referral reward works best?
No published study compares discount, store credit, cash and gifts on conversion, so pick on cost. Store credit has the clearest structural advantage because it is redeemed against a margin-bearing basket, though it is deferred revenue until redeemed and may carry escheat exposure in some US states.
How big should a referral reward be?
Size it against the total value of a referred customer. In the one properly measured case, a EUR 25 voucher exceeded the roughly EUR 20 acquisition-cost saving and the program still paid, through about 25% higher margin in the window and about 18% lower churn hazard. Note the margin advantage there was estimated to expire after about 857 days, while the retention advantage did not.
Do I need to disclose a referral reward?
Yes. Under the FTC Endorsement Guides at 16 CFR Part 255, a discount or other benefit given to a referrer is a material connection requiring clear and conspicuous disclosure, and Example 11 covers referral compensation specifically. If the reward is tied to a review expressing a particular sentiment, 16 CFR Part 465 also applies, at up to $53,088 per violation.
Sources
Gershon, Cryder & John (2020), “Why Prosocial Referral Incentives Work: The Interplay of Reputational Benefits and Action Costs,” Journal of Marketing Research. Eight experiments including two field experiments. GiftAMeal: 6,364 customers emailed across control, sender-benefiting, recipient-benefiting, shared (two-sided) and donation conditions. Conversion was 0.94% for recipient-benefiting and 0.94% for shared (p = .99), against 0.39% sender-benefiting and 0.08% control. Game Access: 1,500 assigned, 1,438 emails delivered; conversion 4.77% recipient-benefiting against 1.71% sender-benefiting and 0.61% control. The paper states that the shared incentive “did not outperform the recipient-benefiting incentive.” Harvard Business School research on structure referral rewards
Schmitt, Skiera & Van den Bulte (2011), “Referral Programs and Customer Value,” Journal of Marketing 75(1):46-59. One large German retail bank, anonymized, paying referrers a EUR 25 voucher. 5,181 referred and 4,633 non-referred customers acquired in 2006, analyzed sample 9,495 after removing influence points; observation window January 2006 to September 2008 (33 months). Referred customers were worth about EUR 40 (16%) more on a six-year lifetime value basis and EUR 49 (about 25%) more within the window; acquisition cost was about EUR 20 lower; churn hazard was about 18% lower, with 82.0% of referred against 79.2% of non-referred still active at 33 months. The margin advantage shrinks by 23.1 cents per 1,000 days and the paper states that “the expected contribution margin advantage of a referred customer disappears after 857 days,” while on retention “there is no such erosion.” The abstract adds that “the size of the value differential varies across customer segments; therefore, firms should use a selective approach for their referral programs.” Wharton research on structure referral rewards
Van den Bulte, Bayer, Skiera & Schmitt (2018), “How Customer Referral Programs Turn Social Capital into Economic Capital,” Journal of Marketing Research. Same bank, now at dyad level: 1,799 referrer-to-referral dyads (3,598 customers) against 3,663 non-referred. Referred customers churned about 30% less after controls (9.7% against 14.5% by the end of the window), but the paper finds they “exhibit lower churn only as long as their referrer has not churned.” Churn was about 40% lower while the referrer remained a customer and markedly higher once the referrer left. Referrers with under one month of tenure produced referrals whose margin was below that of non-referred customers, which is why the authors advise recruiting referrers “among their customers who have been acquired at least six months ago.” Peer-reviewed study (SAGE) on structure referral rewards
Gershon & Jiang, “Referral Contagion: Downstream Benefits of Customer Referrals,” Journal of Marketing Research. Mobile cashback firm, 41.2m registered customers 2012 to 2022, with a 500,000-consumer regression sample, plus a 20-company dataset and a field experiment. Referred customers themselves referred substantially more: invitation rates of 8.72% against 2.51%, and 31% to 57% more referrals, with 19 of 20 companies showing the pattern. The authors state the field comparisons are not causal and that referral status is not randomized, so treat this as a targeting signal rather than a proven effect. Peer-reviewed study (SAGE) on structure referral rewards
FTC Guides Concerning the Use of Endorsements and Testimonials in Advertising, 16 CFR Part 255 (revised Guides, 88 FR 48102, effective July 26, 2023). §255.0(b) defines an endorsement to include social media posts and verbal statements consumers would take as reflecting someone other than the sponsor. §255.5(a) treats payments, free or discounted products, early access and a chance at a prize as material connections that must be disclosed clearly and conspicuously. Example 11 covers affiliate and referral compensation specifically, and Example 9 covers earning points exchangeable for prizes, which is structurally a tiered referral program. The Guides are administrative interpretations of FTC Act Section 5 rather than regulations. FTC Endorsement Guides
FTC Rule on the Use of Consumer Reviews and Testimonials, 16 CFR Part 465 (89 FR 68034, effective October 21, 2024). This is a rule, so violations carry civil penalties of up to $53,088 each under FTC Act §5(m)(1)(A) (16 CFR 1.98(d), for penalties assessed after January 17, 2025). §465.4 prohibits providing compensation or other incentives conditioned, expressly or by implication, on a review expressing a particular sentiment. §465.1 defines the compensation broadly enough to cover discounts, coupons and store credit. Relevant here because a program that routes a referral reward to customers selected for leaving a positive review moves from Part 255 into Part 465. FTC rule on consumer reviews and testimonials
Shopify, “Referral Marketing Statistics.” Vendor guidance, cited only for the figures it carries and attributes, each of which lacks a stated sample: referral traffic converting at 2.5% to 3.5% against 0.5% to 1% for paid social (Elogic Commerce); a “healthy referral rate” of 1% to 3% (unattributed); and merchant anecdotes from the Shopify Masters podcast. It does not address friend-side rewards, referral fraud, FTC disclosure or program promotion. Shopify referral marketing statistics