Most shoppers use one code and stop. Professionals treat every checkout as a layer cake: a store promo, a cashback portal, a card reward and sometimes a gift-card discount — all on the same order. Done right, the layers multiply instead of merely adding.
The correct stacking order
Start at a cashback portal, then shop the sale price, then apply the single best promo code. Cashback is calculated on the post-code total at most portals, so the code goes in before you click through — but the portal visit must come first to track.
Which combinations actually work
Sale price plus one code plus portal cashback works almost everywhere. What rarely works: two codes on one order, or a code on top of an already-discounted gift-card purchase. When a store says “excludes other offers”, the code usually still applies to sale items — only the second code is blocked.
A real example from last week
Our editor bought a $120 jacket: sale price $84, a 20%-off code brought it to $67.20, portal cashback of 8% returned $5.38, and a card offering 2% back added $1.34. Final effective price: about $60 — half off, with zero risk.
Mistakes that void the stack
Opening a second tab breaks portal tracking. So does applying a code the portal excludes — always skim the portal's exclusion list before counting the cashback. And never use a store's “pay with points” toggle if you want the code to apply; points usually cancel promos.
Try it today
The Tech Mega Sale code stacks with clearance prices — a perfect first stack.
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