Trendyol campaign math: how does a discount erode profit?
The relationship between discount and profit is not linear; a 15% discount cuts profit by far more than 15%. The reason is the structure of the deductions: because commission is calculated on the discounted (VAT-included) price, it falls along with the price, but the service fee and the product cost stay fixed. Shipping is usually fixed inside a price band but can change at the 200 and 350 TL bracket thresholds. As the price drops, these items eat into what is left of the profit. A concrete example: at a 450 TL sale price, 20% commission, 2 desi (volumetric unit) and a 180 TL (VAT-included) cost, the unit profit is 46.30 TL; at a 15% discount it drops to 1.86 TL, and it hits zero at about 15.6%. In other words, a "small discount" wipes out almost all of the profit on this product. You can see an item-by-item breakdown of the deductions in the Trendyol profit calculator, and find your package's desi with the desi calculator.
The break-even discount rate: how far can you go before turning a loss?
This is the simulator's most critical output: the discount percentage at which unit profit hits exactly zero. Below this rate every sale still leaves a profit (a shrinking one, but a profit); every point above it turns a sale into a loss. On low-priced products the threshold comes very early, because fixed items like shipping + the service fee already swallow a large share of the price. Knowing your own break-even rate before joining a campaign turns the question "where should I set the discount" from a guess into a number.
The volume-increase fallacy: the "I'll sell 3x more" math
The logic of a campaign is that higher volume offsets the drop in unit profit — but the multiplier you need is bigger than most sellers think. The rule is simple: required unit multiplier = normal unit profit ÷ campaign unit profit. In the example above, profit drops from 46.30 TL to 1.86 TL, so even the break-even point needs about 25x the sales; a 3x increase in sales actually lowers total profit on this product. The simulator shows the total profit and the difference for both scenarios directly, and calculates the minimum number of units the campaign needs to catch up to the normal scenario. For a full decision framework that also covers estimating sales volume, stock and Buybox, see the should-I-join-the-campaign guide.
Why is this simulator free?
Similar campaign simulators are offered as part of paid tiers in some seller software; at Riseluc this tool is free and needs no sign-up. The campaign period is the truly risky one: with prices changing fast, margin becomes hard to track by hand. Riseluc's margin-protected repricing and profit-tracking features fill exactly this gap — they hold the lower margin limit you set through price changes and alert you when they detect a product has turned into a loss.
Full desi rates use Trendyol's official 13 July 2026 tariff; bracket amounts come from the Trendyol Seller Information Center article "Kargo Baremi Uygulaması" (effective 10 August 2026) because the PDF omits them. Campaign terms (discount sharing and extra support) vary. Verify all current figures and terms in Seller Center.