Last updated: February 2025

Discounts drive immediate conversions. Cashbacks build loyalty and protect margins. For UK Shopify and WooCommerce merchants, the question isn't which to use — it's when. Here's how to think about incentive strategy at the checkout level.

Discounts and cashbacks both work — but they work differently, and at different costs

Every UK ecommerce merchant has run a discount at some point. Discounts are familiar, easy to implement, and produce an immediate, visible effect on conversion during the promotional period. They also produce an immediate, visible effect on margin — and a less visible but real effect on customer psychology that can be harder to reverse than the promotion itself.

Cashbacks are less widely used, partly because they're slightly more complex to implement and partly because their benefits are less immediate and harder to measure. But the margin math is different, the customer behaviour they encourage is different, and the long-term effect on customer lifetime value tends to favour cashbacks over discounts for merchants who are thinking beyond the next sales event.

The right answer for most UK Shopify and WooCommerce merchants isn't choosing one over the other — it's understanding what each is actually doing and using them accordingly.

Quick summary

• Discounts reduce the checkout amount immediately, creating urgency and removing price friction — most effective for new customer acquisition, flash sales, and cart abandonment recovery

• Cashbacks defer the incentive rather than reducing the upfront price, which typically preserves more margin per conversion and creates a different psychological relationship with the brand

• Cashback recipients tend to return more often and spend more on repeat purchases than discount-driven customers, because cashback creates a sense of credit to redeem rather than a deal to chase

• From a margin perspective, cashbacks can be treated as a marketing cost rather than a revenue reduction — and unclaimed cashback stays with the merchant entirely

• The two strategies aren't mutually exclusive: discounts for acquisition and urgency, cashbacks for retention and margin-sensitive categories, is a coherent and practical framework

• Pay by Bank via Fena reduces the processing cost per transaction, which creates more room to run cashback programmes profitably without absorbing the double cost of the incentive plus card network fees

How discounts actually affect conversion and margin

Discounts work because they reduce the psychological barrier between wanting something and buying it. Price is the most frequently cited reason for not completing a purchase, and a discount addresses that directly. For a customer on the fence about a £60 item, a 20% discount isn't just £12 off — it's a removal of the hesitation that £60 was creating.

The conversion impact of discounts is most pronounced in specific contexts. Flash sales and time-limited offers add urgency on top of the price reduction, which is why Black Friday and similar events produce significant volume spikes. Cart abandonment recovery via discount-bearing email sequences works because the offer arrives at the moment the customer is still close to having decided to buy. First purchase discounts are effective for customer acquisition because they lower the risk of trying a new merchant.

The margin cost is direct and immediate. A 20% discount on a £100 order produces £80 in revenue, with the full cost of goods, fulfilment, and platform fees still to come out of that £80. For merchants operating on tight margins — which is most UK ecommerce merchants in competitive categories — this arithmetic matters. A discount that produces conversions that wouldn't otherwise have happened can still be profitable. A discount that mainly captures sales that would have happened anyway at full price is a margin reduction with limited incremental benefit.

The behavioural effect of repeated discounting is worth being honest about. Customers who discover a brand through a discount, or who return only when discounts are available, have a different relationship with the brand than customers who pay full price. Discount-first customer acquisition creates a customer base that expects discounts — which makes it harder to sell at full margin later and creates a dependency on promotional periods to hit revenue targets.

How cashbacks work differently — and why the margin math is better

Cashback doesn't reduce the checkout price. The customer pays the full amount and receives a credit or cash return after the transaction, either immediately or after a qualifying period. This seemingly small difference has significant implications for both margin and customer psychology.

The margin difference.

A 20% discount on a £100 order produces £80 in revenue. A £20 cashback on a £100 order produces £100 in revenue, with a £20 marketing cost recorded separately. The P&L treatment is different — the cashback is a cost of customer acquisition or retention, not a revenue reduction — and the effective margin per transaction is typically higher. This distinction matters most at scale and for margin-sensitive product categories.

Unclaimed cashback.

A proportion of cashback offers go unclaimed — the customer earned the credit but never redeemed it. This varies by programme design and redemption mechanism, but unclaimed cashback represents revenue retained without the customer having received the incentive. Discounts have no equivalent — every discount is fully realised at the point of transaction.

The psychological difference.

A discount says "this product is cheaper today." A cashback says "you'll have credit to use next time." These create meaningfully different customer mindsets. The discount customer is responding to a price signal; the cashback customer is building a relationship with a store where they have credit. Research consistently shows cashback programme participants return at higher rates and spend more on repeat visits than discount-driven customers, because the cashback creates a forward-looking reason to return rather than a backward-looking deal to have captured.

Average order value.

Because cashback doesn't reduce the visible checkout price, it doesn't create the same incentive to limit the basket size to what the discount threshold requires. Customers spending £200 to qualify for a £20 cashback are spending more than they might have under a "20% off orders over £100" promotion with the same cost to the merchant.

When to use each: a practical framework

The question isn't which incentive is better in absolute terms — it's which is better for the specific goal at the specific moment.

Use discounts for:

new customer acquisition where the barrier is unfamiliarity with the brand and the goal is to get a first transaction completed; time-sensitive campaigns where urgency is commercially useful (genuine end-of-season clearance, for example); cart abandonment recovery where the customer was close to buying and a price nudge may be the marginal factor; and product-level promotions where clearing stock or introducing a new line justifies a temporary margin reduction.

Use cashbacks for:

loyalty and retention where the goal is increasing the lifetime value of existing customers; high-value or repeat-purchase categories where the average order value justifies a meaningful cashback and the customer is likely to return; margin-sensitive products where a direct discount would make the transaction unprofitable; and brand positioning where you want to reinforce a relationship rather than compete on price.

Combine them strategically:

a first purchase discount that transitions into a cashback loyalty programme is a coherent acquisition-to-retention path. The discount lowers the barrier to entry; the cashback programme changes the relationship with customers who convert. This approach captures the conversion benefit of discounting without permanently anchoring the brand's price positioning.

How payment method choice affects incentive economics

This is where the payment infrastructure question connects to incentive strategy in a way that's worth making explicit.

Card payment processing fees run 1.5–2.5% of transaction value for most UK merchants. On a £100 transaction, the processing cost is £1.50 to £2.50, before any chargeback or dispute costs. Across high volumes, this accumulates into a meaningful cost line.

Pay by Bank via Fena bypasses card network fees — no interchange, no scheme fees, no card processing cost at the card network level. The effective processing cost is lower per transaction, which creates direct margin headroom. For merchants running cashback programmes, this headroom is commercially significant: the payment cost saving partially offsets the cashback cost, making the programme more sustainable.

For a merchant offering a 5% cashback programme and paying 2% in card processing fees, every customer who pays via Pay by Bank rather than card reduces the net cost of the cashback programme by the processing cost saving. At scale, across a meaningful proportion of transactions, this difference compounds.

There's also the chargeback dimension. Cashback programmes don't prevent chargebacks — a customer can claim a cashback and then dispute the transaction through their card issuer. Pay by Bank eliminates card chargeback exposure on those transactions, which removes a risk that's particularly relevant for high-value cashback qualifying orders.

Measuring what's actually working

Both discounts and cashbacks generate data, but they generate different data, and the metrics that matter are different for each.

For discounts, the key metrics are incremental conversion rate (are these sales that wouldn't have happened at full price, or just full-price sales brought forward), margin per transaction during the promotional period, and the subsequent behaviour of discount-acquired customers — do they return, and do they return at full price?

For cashbacks, the relevant metrics are redemption rate (what proportion of cashback is actually claimed, and what does unclaimed cashback represent in retained margin), repeat purchase rate among cashback programme participants compared to non-participants, average order value on cashback-qualifying transactions versus non-qualifying ones, and customer lifetime value over a 12-month period for cashback customers versus discount-acquired customers.

The comparison that matters most is long-term: what does a customer acquired via a first-purchase discount contribute in year one and year two, versus a customer who joined a cashback programme? This requires patience to measure but is the most commercially meaningful comparison for making incentive strategy decisions.

Frequently asked questions

Are cashbacks more profitable than discounts for Shopify merchants?

In most cases, yes — particularly for retention-focused use cases. Cashbacks preserve more revenue per transaction because the full purchase price is paid upfront, they can be treated as a marketing cost rather than a revenue reduction, and unclaimed cashback stays with the merchant. The comparison changes for acquisition campaigns where discount-driven conversion wouldn't have happened at full price.

When should UK merchants use discounts instead of cashbacks?

Discounts are most effective for new customer acquisition, time-sensitive sales events, cart abandonment recovery, and stock clearance. The urgency and immediate price reduction they create are genuinely useful in these contexts in ways that cashbacks — which are deferred incentives — aren't.

How do cashbacks improve customer retention on Shopify?

Cashbacks create a forward-looking relationship with the store — the customer has credit to use, which is a reason to return. This is psychologically distinct from discounts, which create backward-looking satisfaction (I got a deal) without necessarily creating a reason to return. Customers who participate in cashback programmes consistently show higher repeat purchase rates and higher average spend on return visits than discount-driven customers.

How does paying via Pay by Bank affect cashback economics?

Pay by Bank via Fena processes payments without card network fees — no interchange, no scheme fees. The processing cost saving per transaction creates margin headroom that partially offsets cashback programme costs, making cashback programmes more financially sustainable. It also eliminates card chargeback exposure on Pay by Bank transactions, which removes a risk that's particularly relevant for high-value orders qualifying for cashback.

What is the margin impact of a cashback versus a discount?

A 20% discount on a £100 order produces £80 in revenue with all costs unchanged. A £20 cashback on the same order produces £100 in revenue with a £20 marketing cost — effectively the same cash impact, but treated differently on the P&L and with the possibility that some cashback goes unclaimed. For margin-sensitive products, the cashback treatment preserves more reportable revenue per transaction.

Should Shopify merchants run both discounts and cashbacks?

Yes, as part of a deliberate strategy rather than in competition with each other. Discounts for acquisition and urgency; cashbacks for retention and margin-sensitive categories. A first-purchase discount that transitions customers into a cashback programme is a coherent and commercially sensible approach to the full customer lifecycle.