[2026 Latest] A Must-See for Beginners! What is EC Payment Fee Comparison? A Thorough Explanation of the Break-Even Point for Merchant Discount Rate (MDR)

When operating an e-commerce site, managing the cost of "payment fees" is unavoidable. If your sales are growing but profits aren't following, the cause may lie in the structure of your payment fees. In this article, we provide an easy-to-understand guide for beginners on how to choose a Payment Service Provider (PSP), the impact of the Merchant Discount Rate (MDR) on profits, and a thorough explanation of the break-even point concept.

1. Basic Structure of EC Payment Fees and the Importance of MDR

Payment fees in e-commerce are a general term for the costs paid to credit card companies and payment service providers when a customer purchases a product. At the core of this is the Merchant Discount Rate (MDR). This is typically set as a percentage of sales (generally around 2.5% to 5.0%).

Payment costs are determined not just by the rate, but by a combination of "initial setup fees," "monthly fixed fees," and "transaction fees (processing cost per item)." Especially for small-scale shops, even if the rate is low, high monthly fixed fees can lead to a heavy effective burden per transaction, so caution is required. Grasping all cost items from a MECE (Mutually Exclusive, Collectively Exhaustive) perspective is the first step toward financial health.

2. Fee Comparison of Major Payment Methods and Market Trends

In the Japanese market as of 2026, in addition to credit card payments, demand for QR code payments like PayPay and Buy Now Pay Later (BNPL) services has surged. Fee rates vary depending on the payment method. The following chart compares the average fee rates by payment method for typical payment service providers.

As seen in the chart, carrier billing and BNPL payments tend to have higher fee rates. However, implementing these methods can improve the conversion rate (CVR) for younger demographics without credit cards or more cautious customers, necessitating business decisions that balance cost and revenue.

3. Break-Even Point Simulation: Optimal Plans by Monthly Sales

Pricing plans for Payment Service Providers (PSPs) generally fall into two patterns: "No fixed fee / Higher rate" and "Fixed fee / Lower rate." Understanding the break-even point between these two plans is key to maximizing profit.

For example, when comparing Plan A (no monthly fee, 5% commission) and Plan B (5,000 yen monthly fee, 3% commission), the point where the 2% difference exceeds the 5,000 yen fixed fee—meaning if monthly sales are 250,000 yen or more, Plan B is more cost-effective. It is important to review your contract at the appropriate time in accordance with your company's monthly sales growth roadmap.

4. Three Key Points to Avoid Failure When Selecting a Payment Service Provider

Choosing based solely on low fees can lead to unexpected operational issues. Compare providers from the following three perspectives.

• Deposit Cycle: If cash flow is a priority, check for options such as twice-monthly deposits or early deposit services.
• Security: Support for 3D Secure 2.0 and the presence of fraud detection systems reduce the risk of chargebacks (reversal of sales due to fraudulent use).
• Dashboard Usability: Whether refund processing and sales aggregation can be performed smoothly directly impacts the reduction of back-office man-hours.

WRITTEN BY

Osamu Yasuda

Senior Managing Director & COO

Meets Consulting Inc.

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