How to Calculate Your Actual Fixed Costs: Card Terminal Rental, Monthly Management Fees, and Communication Charges

Hello! Have you ever been shocked looking at your settlement account each month thinking, "Wait, how much went out?" 📊 In reality, most small business owners and self-employed individuals operate without accurately understanding the complete structure of card terminal costs.

This article, based on Shim Jae-woo, CEO of TheKLLink's experience diagnosing over 1,000 merchant locations, reveals practical methods to calculate "exactly how much your card payment costs are." After reading this, you'll be able to identify overlooked fixed cost items and understand how much you can actually save each month.

Recently, Korea's domestic card approval market reached 1,266 trillion won in 2025, with average daily PG usage reaching 1.5542 trillion won. Yet merchants continue complaining, "Settlement periods are long, cash flow is blocked, and fixed costs keep increasing." Why? Because they don't know the complete picture of costs they're paying.

The payment costs merchants bear are more complex than you think. Most people only know "2.5% commission," then get shocked looking at their settlement account because there are dozens of "hidden items" beyond the commission.

In a recent 3-month diagnosis of 1,200 business locations, TheKLLink found that 92% didn't know their exact monthly payment costs. This doesn't simply mean "they didn't calculate" — it means the settlement notices themselves are scattered across different items, making them difficult to identify.

In reality, the following costs overlap:

* Card commission — 1.5% ~ 3.5% of transaction amount (varies by industry and credit rating)
* Terminal rental fee — 50,000 won ~ 150,000 won per month (varies by wired/wireless/smart POS type)
* Communication fee — 10,000 won ~ 30,000 won per month (LTE/wireless data charges)
* Monthly management fee — 10,000 won ~ 50,000 won per month (system maintenance costs)
* Call center cost — 5,000 won ~ 10,000 won per month (technical support fee)

Since these come as separate receipts, it's difficult to grasp "how much you're paying in total" at a glance.

1. The misconception that "you only need to calculate commission"

This is the most common error. Many merchants think, "Oh, if it's 2.5% commission, then 10 million won monthly revenue means 250,000 won." But the actual bill comes to around 400,000 won. Why?

Because rental fees, communication charges, management fees, and VAT (10%) are added separately. For example, a business with 10 million won monthly revenue:

* Card commission: 250,000 won
* Terminal rental fee: 60,000 won
* Communication fee: 20,000 won
* Monthly management fee: 30,000 won
* VAT on total (10%): 36,000 won
* Total cost: approximately 396,000 won

This amounts to 1.5 times the commission. This is the first source of "hidden costs."

2. The misunderstanding that "same settlement date means same cost"

Many merchants, when choosing settlement cycles (same-day, D+1, D+3), only look at "when the money comes in." However, when you change the settlement cycle, the commission rate itself changes too.

Based on TheKLLink's consulting experience, same-day settlement incurs an additional 10,000 ~ 30,000 won monthly, while D+3 settlement can lower the base commission by 0.1~0.3%. For a business with 20 million won monthly revenue, this creates a 20,000 ~ 60,000 won monthly difference.

3. The common belief that "all card company commissions are the same"

Commission rates differ for credit cards, debit cards, international cards (VISA/Mastercard), and easy payments (PayPal, Toss, etc.). Even between PG companies like Nice Pay, KCP, and Inicis, base commission rates vary by 0.2~0.5%.

If your monthly revenue is 30 million won, just a 0.3% commission difference means 90,000 won monthly, or 1.08 million won annually.

4. The fixed idea that "terminals are expensive, so renting is better"

Generally, card terminal purchase prices range from 600,000 to 1.5 million won. If monthly rental is 80,000 ~ 100,000 won, purchasing becomes cheaper after 15 months. Yet many merchants rent for life saying "renting is convenient."

TheKLLink provides equipment at 0 won through "free support" and doesn't charge monthly management or maintenance fees either. This is a model that redesigns merchant burdens from the ground up.

5. The mistake that "settlement deposit amount = net profit"

Many merchants think when "today's settlement of 20 million won came in," that's their revenue. Actually, this is already after commissions and management fees are deducted.

If the transaction amount (actual completed sales) was 20.5 million won, the 20 million won deposit is what remains after commissions and VAT. You need to know how to back-calculate your actual costs.

Now, let's calculate directly. Prepare your recent 3-month settlement account and credit card payment statements.

Step 1: Find the "sum of deposits" from your recent 3-month settlement account

•Example) January 19.5 million won + February 21.2 million won + March 18.8 million won = 59.5 million won

Step 2: Record ALL "commission, management fee, and VAT items" from your credit card, debit card, and easy payment statements

•Items: Basic commission / Merchandise discount / Terminal rental fee / Communication fee / Monthly management fee / VAT

•Calculate the total for each item separately

Step 3: Back-calculate to find "actual transaction amount"

•Actual transaction amount = Settlement amount ÷ (1 - Total commission rate%)

•Example) If settlement amount is 59.5 million won and average commission rate is 3.8%:

•Actual transaction amount = 59.5 million won ÷ (1 - 0.038) = approximately 61.8 million won

•Actual cost = 61.8 million won - 59.5 million won = 2.3 million won

This 2.3 million won is "all card payment-related costs you paid over 3 months." On average per month, it's approximately 770,000 won.

Let's look at a Gangnam cafe case recently diagnosed by TheKLLink.

Before Changes (Existing PG Company)

•Monthly revenue: 22 million won

•Card commission: 570,000 won (2.6%)

•Terminal rental fee: 120,000 won

•Communication fee: 20,000 won

•Monthly management fee: 50,000 won

•VAT: 76,000 won

•Total monthly cost: 836,000 won (3.8% of transaction amount)

After Changes (Following TheKLLink Consulting)

•Monthly revenue: 22 million won (same)

•Card commission: 440,000 won (2.0% — reduced through credit rating improvement)

•Terminal rental fee: 0 won (free support)

•Communication fee: 0 won (PG company bears cost)

•Monthly management fee: 0 won (free support)

•VAT: 44,000 won

•Total monthly cost: 484,000 won (2.2% of transaction amount)

Savings: 352,000 won monthly → 4.224 million won annually

This cafe reported that after changing the settlement cycle from D+1 to same-day settlement, cash flow improved significantly and peak season operations became much smoother.

Q1: Can I calculate exactly what I paid using only my settlement account?

A: The settlement account shows only partial costs. The settlement amount already has commissions deducted. For accurate calculation, you need to collect "payment statements" for 3 months from credit card companies, debit card companies, and PG companies. If you haven't received statements, you can download "settlement details" from each company's website MyPage.

Q2: Besides commission, what other costs are definitely deducted?

A: At minimum, 4 items: ① Card commission (based on transaction amount) ② Terminal rental fee (monthly fixed) ③ Communication fee (monthly fixed) ④ VAT (1~10% — applied to each item). Monthly management fees, technical support fees, and card company add-on service fees may be added on top. Since it varies by location, directly checking "recent 3-month statements" is most accurate.

Q3: You mentioned that changing settlement cycles (same-day/D+1/D+3) changes commissions too — what's a good choice?

A: There's no "best" answer. Same-day settlement has faster cash flow but may charge 0.1~0.3% higher commission. D+3 settlement has lower commissions but 3-day delayed cash turnover. If monthly revenue is volatile or there are major peak/off-season differences, same-day settlement is better. If stable and prioritizing cost reduction, D+2~D+3 is better. TheKLLink diagnoses your business cash flow and then proposes the "optimal settlement cycle."

Q4: If I use multiple card terminals, are costs charged separately?

A: Yes, each terminal incurs rental and communication fees separately. If you use both wireless mobile terminals and wired desktop terminals, you pay 80,000 ~ 120,000 won monthly each. TheKLLink's "free support" policy applies regardless of terminal count, making it especially effective for small restaurants, marts, and franchises requiring multiple terminals.

Card terminal costs aren't just in "visible commission." When dozens of items like rental fees, communication charges, management fees, and VAT overlap, your actual burden becomes 1.5 times or more the basic commission. 🎯

The first step is understanding exactly "how much your business pays monthly." Next, you can proceed with ① commission rate renegotiation ② settlement cycle optimization ③ unnecessary add-on service removal.

If you're paying over 300,000 won monthly in payment costs, it's definitely worth reviewing the structure. Based on experience diagnosing over 1,000 merchant locations in Jung-gu, Seoul, TheKLLink provides PG consulting covering environment diagnosis → structure design → one-stop implementation → operation and expansion. Card commission burden and settlement delay issues can be resolved through consultation.

For consultation, contact 010-2397-5734 or jaiwshim@gmail.com.

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| Item | Existing PG (Rental Basis) | TheKLLink (Free Support) | Selection Considerations |
|---------|------------------|-------------------|------------------|
| Terminal rental fee | 80,000 ~ 120,000 won/month | 0 won (free support) | Zero initial investment, maximum cost reduction for long-term operation |
| Communication fee | 20,000 ~ 30,000 won/month | 0 won (PG company bears) | Full wireless/LTE communication fee waived for stable monthly cost management |
| Monthly management fee | 10,000 ~ 50,000 won/month | 0 won (free support) | System maintenance, regular inspections, parts replacement — PG company responsibility |
| Card commission | 1.8~3.5% | 1.5~2.5% (by credit rating) | Structured at lowest level based on review and industry/scale |
| Settlement cycle | D+1 fixed | Same-day or D+1~D+3 choice | Freely choose to match cash flow |
| Comprehensive savings effect | — | 300,000 ~ 600,000 won monthly savings | 3.6 ~ 7.2 million won annual cost reduction (varies by business scale) |

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📍 Learn More About TheKLLink

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

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

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