How it is calculated
Net profit = customer payment (price + customer shipping) − marketplace fees − product cost − courier cost − packaging − ads − VAT
Margin is net profit divided by the customer payment. Break-even price is the price where net profit is zero. Below it, every sale loses money.
Default fees by marketplace
These are the calculator’s default rates. They vary by category, promotion and contract, so edit them above if your seller center shows different figures.
| Marketplace | Item | Rate | Charged on |
|---|---|---|---|
| Smart Store | Naver Pay order-handling fee | 1.98% ~ 3.63% | Price + shipping |
| Smart Store | Sales fee (from Naver) | 2.73% + VAT | Product sales |
| Smart Store | Sales fee (seller marketing link) | 0.91% + VAT | Product sales |
| Coupang | Category sales fee | 4% ~ 10.9% | Final customer payment |
| Coupang | Shipping fee commission | 3.3% | Shipping paid by customer |
| Coupang | Service fee | Monthly 55,000 KRW | When monthly sales ≥ 1 million KRW |
Basis: Naver fee reform effective 2 June 2025; Coupang rate table published in 2024. Coupang sales fees are treated as VAT-exclusive, so 10% is added. The monthly Coupang service fee is not included in the per-unit result.
FAQ
What margin is good enough?
It depends on the category, but sourced and dropshipped products lose margin fast once you advertise. Check that profit remains after ad spend. Many sellers aim for 25 to 30% before ads.
Smart Store 'From Naver' and 'My marketing link': what is the difference?
Since June 2025, orders arriving through Naver (such as Naver Shopping search) carry a 2.73% sales fee, while orders from social media or communities via a seller-center marketing link carry 0.91% (both VAT excluded). Traffic from Naver shopping search ads and Power Link also gets the lower rate.
How accurate is the simplified VAT estimate?
It approximates retail with a 15% value-added ratio (sales × 15% × 10%, minus 0.5% of purchases). If sales are under 48 million KRW, payment is waived, so choose 'Exclude VAT' in that case.
How is general VAT estimated?
Output VAT (1/11 of the payment) minus input VAT included in cost, courier, packaging, fees and ads (1/11 of each). Purchases without tax invoices make the real amount higher.
Are my inputs saved?
Inputs stay in this browser and are never sent to a server. 'Share link' copies a link that contains your inputs.
Prefer a spreadsheet?
Get the seller margin spreadsheet (Excel) for free, built on the same formulas. Add one product per row and it calculates fees, VAT, profit and margin, highlighting loss-making products in red. (Sheet labels are in Korean.)
Download the free template (.xlsx)
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Related: Coupang fees by category · Naver Smart Store fees explained · Coupang sales fees explained