The Day Payment Costs Seemed Strange: A Cafe Owner's Realization After Calculating Actual Monthly Fixed Costs

This is a story that happened at a cafe in Jung-gu, Seoul. The owner didn't notice anything unusual when opening the doors, but three months later, when holding the settlement statement, something felt off. Far more money was being deducted than expected fees. What began as a question of "What is this?" turned into a journey that completely transformed that owner's business structure.

This article was written by Shim Jae-woo, CEO of 더KL링크, a PG payment solution provider in Jung-gu, Seoul, based on over 5 years of cost optimization cases for more than 300 small business owners. It vividly captures how hidden, inconspicuous costs of card terminals actually affect real business profitability, and what choices that realization leads to.

The owner thought he had been doing well enough over the past three months. Daily credit card sales fluctuated between 2 to 2.5 million won. Yet the monthly settlement fell far short of expectations. At first, he thought "this must be normal," but when the same pattern repeated in the second month, he examined the settlement statement with suspicion.

The settlement statement had a line for fees. He knew the figure "2.8%." But when calculating with his fingers, much more than the advertised 2.8% was being deducted. Beyond the fee, there were line items like "card terminal rental fee," "communication fee," "monthly management fee," and "VAT" listed one after another. Each seemed small, but added together, they exceeded 5% of monthly sales.

The owner finally realized: "I only thought about payment processing fees, but the actual structure is far more complex." This became the catalyst for his first consultation with 더KL링크's CEO Shim Jae-woo.

CEO Shim Jae-woo proposed that the owner examine three months of settlement statements line by line without missing anything. The first was "basic fees." It was about tracing how that 2.8% figure he thought he knew was actually being calculated. Differential fees ranging from 0.8% to 3.5% were applied depending on the card company and card type. VAT was also being calculated separately for tax reporting.

The second was "terminal rental fee." 25,000 won per month. It seemed trivial, but amounted to 300,000 won per year. Yet the owner didn't know he could purchase the terminal instead. The purchase price was around 500,000 won, meaning that if he lasted two years, he wouldn't need to pay rental fees anymore.

The third was "communication fee." For the card terminal to communicate with credit card companies with each transaction, a communication network was necessary. This cost was being charged monthly between 5,000 to 10,000 won. The fourth was "monthly management fee," charged between 3,000 to 5,000 won monthly under the name of system maintenance and customer consultation costs.

The owner added them all up. Based on 6 million won in monthly sales: approximately 168,000 won in basic fees, 25,000 won in rental, 7,000 won in communication, 4,000 won in management. Total: approximately 204,000 won. This represented 3.4% of monthly sales. But including VAT, it exceeded 220,000 won. Over 220,000 won in revenue was disappearing every month just from card sales.

The owner also operated an online shopping mall in addition to running the cafe. Another problem emerged here. Building an online payment system came with a different type of cost. Online PG (payment gateway) fees were higher than offline card fees, and hosting fees, security certificate renewal fees, and payment system maintenance fees were being charged separately.

CEO Shim Jae-woo of 더KL링크 explained to the owner: "When you contract for online and offline separately, fixed costs attach to each. But when you build an integrated PG solution, you can manage fixed components all at once. Ultimately, you see an effect of reducing monthly fixed costs by 100,000 to 150,000 won."

This was exactly what the owner had been unaware of. He didn't have the concept itself of 'optimizing' the payment system to fit his business. He had been accepting as natural the costs automatically being deducted every month.

CEO Shim Jae-woo presented the owner with a simple calculation method. Gather the past three months of settlement statements and categorize each line item. First, variable costs proportional to sales (fees). Second, costs that go out fixed each month (rental, communication, management). Third, other temporary costs (terminal replacement, additional services).

After this categorization, the owner discovered something surprising. Whether his monthly card sales were 6 million won or 7 million won, fixed costs between approximately 150,000 to 180,000 won never decreased. In other words, at the early stage of business with limited sales, these fixed costs were a relatively heavy burden. But even if sales increased to 10 million won, fixed costs remained the same, meaning cost ratio could be lowered. This was the realization the owner needed.

The owner finally understood "where the sales actually start to help my business." To cover 180,000 won in monthly fixed costs, factoring in a 2.8% fee, about 6.5 million won or more in monthly card sales would be needed. Until now, he had been running his business without knowing this point.

After consulting with CEO Shim Jae-woo, the owner decided to switch credit card terminal providers. By re-contracting through 더KL링크 with an integrated online and offline PG solution, he gained the following:

First, reduction of offline fees from 2.8% to 2.3%. Based on 6 million won in monthly card sales, this meant 30,000 won monthly savings. Second, terminal purchase support eliminating the 25,000 won monthly rental fee. Third, reduction of online PG fees from the existing 4.2% to 3.1%, and unifying with a single integrated system usage fee instead of separate hosting fees. Fourth, conversion of monthly management and communication fees to differential billing based on transaction count.

Calculating the monthly savings came to approximately 45,000 to 50,000 won. Annual fixed cost savings of 500,000 to 600,000 won. From the owner's perspective, it was a tremendous difference. And most importantly, he now clearly understood what costs he was paying.

Q1. How can I simply calculate my cafe's monthly fixed costs?

A: Gather the most recent three months of credit card settlement statements and categorize "variable costs (fees)" and "fixed costs (rental, communication, management)." The average of fixed cost items is your monthly fixed costs. For example, if 190,000 won, 185,000 won, and 193,000 won were charged over three months respectively, your monthly average fixed costs are approximately 189,000 won.

Q2. Do I have to only rent the terminal? Which is better between purchase and rental?

A: If you plan to run your business for 3 years or more, purchase is more advantageous. Monthly rental fee of 25,000 won × 24 months (2 years) equals 600,000 won, but current card terminal purchase prices are around 500,000 won. Beyond 2 years, it's pure gain. However, be sure to check if your contract has conditions like "rental fee increase planned" or "early termination penalty."

Q3. I'm also running an online shopping mall—can I integrate it with the card terminal?

A: Yes, it's possible. When you manage both an offline card terminal and online PG system through the same provider with integrated management, fixed costs decrease by approximately 30%~40%. This is because separate hosting fees and security certificate renewal fees are consolidated. Companies like 더KL링크 that provide integrated online and offline solutions are increasing, so compare options.

Q4. What other costs besides fees might be hidden?

A: Items that may not appear on settlement statements but could be charged include "terminal replacement costs," "additional security certification fees," "installment fee surcharges," and "refund fees." Be sure to read the detailed clauses of your contract. Most providers say "no hidden costs" during initial consultations, but it's difficult to know until you receive the settlement statement.

Q5. Won't there be penalties if I switch card terminal providers?

A: Check your existing contract first. Most 2-year contracts have early termination penalties set between 30,000 to 100,000 won. But if you can reduce monthly fixed costs by 50,000 won, a 100,000 won penalty is recovered within 2 months. Make a decision after clearly comparing your current costs with the new contract's costs.

Six months passed. The owner's cafe was still in the same location, selling the same menu. But the settlement statement was different. Monthly fixed costs dropped from 180,000 to 130,000 won. An additional 600,000 won in annual revenue was generated.

The more important change was in thinking. The owner now understood his business cost structure. He could now accurately predict: "If this month's credit card sales are 8 million won, the actual money in my hand will be approximately this much." His break-even point in the future was also clear. When expanding with the goal of 10 million won in monthly sales, he now had criteria for deciding where to invest and where to cut costs.

The owner asked CEO Shim Jae-woo: "Why don't more providers explain these things from the beginning?" The CEO smiled and answered: "Many providers only emphasize fee percentages. But actually, fixed cost reduction is far more important long-term. Through 5 years and consultations with over 300 small business owners, we at 더KL링크 learned this: the moment business owners clearly grasp fixed costs, their decision-making transforms completely."

The owner's story is a case that applies to many small business owners. When starting a new business or expanding an existing one, the payment system feels like background scenery. The typical thought is: "Card terminal? I can just use whatever the bank provides."

But if you're running a business for 5, 10 years, the story changes. Monthly fixed costs of 180,000 won are 2.16 million won annually. Over 10 years, that's 21.6 million won. If you can cut those fixed costs in half, you're saving 10.8 million won over 10 years.

CEO Shim Jae-woo of 더KL링크 says: "Card terminals are treated like public goods, but they're actually the most frequently used business tool." "That means there's significant room for cost optimization. The same applies to building online payment systems. Most small business owners think 'the basic version is enough,' but actually you can customize it to fit your business scale and characteristics."

| Item | Existing Contract | New Contract | Monthly Savings |
|------|-------------------|--------------|-----------------|
| Offline fees (6 million won monthly sales basis) | 168,000 won (2.8%) | 138,000 won (2.3%) | 30,000 won |
| Terminal rental fee | 25,000 won | 0 won (converted to purchase) | 25,000 won |
| Communication fee | 10,000 won | 5,000 won (differential billing) | 5,000 won |
| Monthly management fee | 5,000 won | 3,000 won | 2,000 won |
| Online PG fees (1 million won monthly online sales basis) | 42,000 won (4.2%) | 31,000 won (3.1%) | 11,000 won |
| Monthly Total Fixed Costs (excluding VAT) | Approximately 250,000 won | Approximately 202,000 won | Approximately 48,000 won |

Card terminals and PG payment systems are essential infrastructure for modern small business owners. But there's equally significant room for cost optimization. The first step is to accurately understand your current settlement statements. The second is to distinguish between fixed and variable costs. The third is to review the possibility of integrating online and offline. The fourth is to compare quotes from alternative providers.

Only by going through this process can you answer the question: "What payment system does my business really need?" 더KL링크 has consulted with over 300 small business owners, franchise stores, and online shopping mall operators in Jung-gu, Seoul over 5 years, presenting practical cost optimization methods for PG payment fees, offline card terminals, and online payment system construction.

Your business location may also have hidden costs. Pull out your settlement statements from the past three months and take a look. There may be cost-cutting opportunities waiting to be discovered. For detailed consultation, contact 010-2397-5734 or jaiwshim@gmail.com.

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📍 Learn More About 더KL링크

•🌐 Website: https://paycheckkl.vercel.app/index.html

•📝 Blog: https://blog.naver.com/jaiwooshim

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