With the values above, starting from the VAT-inclusive price, what remains as each cost is deducted:
The VAT inside the price the customer pays is not your income. Profit is calculated on the VAT-exclusive sale amount; enter product cost, shipping and service fees excluding VAT too, so both sides use the same basis.
Trendyol's commission varies by category and changes from time to time. A calculation with an average rate overstates the margin in high-rate categories; take your own rate from your seller panel.
Besides commission, Trendyol charges a fixed platform service fee per order. Because it is a fixed amount it weighs more on cheap products: about 11 points on a 100 TRY sale excluding VAT, about 1 point on a 1,000 TRY sale.
For low-basket products, shipping is the cost that cuts the margin most: 45 TRY of shipping on a 300 TRY sale excluding VAT is 15 points on its own.
A returned order is more than a cancelled sale; it leaves round-trip shipping and packaging costs. Multiplying that cost by your return rate and spreading it over every sale brings the margin closer to reality.
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