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Credit Card vs. Debit Card Strategy for Maximum Refund

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To optimize your tax refund from card spending, you must understand the "25% Rule" and how to strategically rotate between your credit and debit cards.

1. Basic Mechanism​

This is an Income Deduction (reducing your total taxable income), not a direct Tax Credit. Its purpose is to lower your taxable base before the tax rate is applied.

  • Prerequisite ("The 25% Floor"): You only start receiving deductions for spending that EXCEEDS 25% of your Total Gross Salary for that year.
    • Example: If your salary is 40 million KRW, you must spend at least 10 million KRW (25%) before any further spending begins to count toward a deduction.

2. Deduction Rates​

Not all spending is treated equally. The government encourages transparent payment methods and specific sectors:

  • Credit Cards: 15%.
  • Check/Debit Cards & Cash Receipts: 30%.
  • Books, Performances, Museums, Cinema: 30% (Only for those with salary ≤ 70 million KRW).
    • New for 2025: From July 1, 2025, expenses for Fitness Centers and Swimming Pools are also included in this 30% group.
  • Public Transportation & Traditional Markets: 40%.

3. Maximum Deduction Limits​

The deduction is capped and divided into two parts: the Basic Limit and the Additional Limit.

A. Basic Limit​

Depends on your total annual salary:

  • Salary ≤ 70 million KRW: Max 3 million KRW.
  • Salary > 70 million KRW: Max 2.5 million KRW.

B. Additional Limit​

If you hit the basic limit cap, you can unlock more deductions by spending in encouraged categories:

  • Additional Max: Max 3 million KRW combined for Traditional Markets, Public Transportation, and Books/Culture/Sports (Note: Books/Culture/Sports only applies if salary ≤ 70 million KRW).
  • Total Potential: A person can theoretically reach a maximum deduction of about 6 million KRW (3M basic + 3M additional).

Bonus: There is an additional 10% deduction for increased spending if you spend 5% more than the previous year (capped at 1 million KRW).

4. The Smart Strategy: "Divide and Conquer"​

To reach the maximum limit efficiently, apply this multi-phase strategy:

Phase 1: Filling the "25% Floor"​

Priority: Use Credit Cards.

  • Since the first 25% of your spending earns zero tax benefit regardless of the card type, use your Credit Card for this amount.
  • Reason: Credit cards typically offer superior rewards (points, cashback, airline miles). Capture these banking perks for the "tax-useless" portion of your budget.

Phase 2: After Exceeding 25%​

Priority: Switch to Check/Debit Cards and Cash.

  • The moment your year-to-date spending crosses the 25% mark, put away the credit card.
  • Reason: Check/Debit cards and Cash Receipts offer a 30% deduction rate—double that of Credit Cards. This helps you hit the deduction ceiling much faster with less actual spending.

Phase 3: Breaking the Ceiling​

  • Shift spending toward Public Transportation (40%) and Traditional Markets (40%) instead of large supermarkets.
  • Utilize the Books/Culture/Sports category (including gym/pool passes from July 2025) to take advantage of the Additional Limit if your salary is below 70 million KRW.

Practical Example​

Assume your annual salary is 40 million KRW. Your 25% threshold is 10 million KRW.

  1. First 10 Million KRW: Spent via Credit Card.
    • Result: 0 KRW deduction, but maximum reward points collected.
  2. Next 10 Million KRW: Spent via Check/Debit Card.
    • Calculation: 10,000,000 * 30% = 3,000,000 KRW deduction.
    • Result: You have now hit the Basic Limit cap for your salary tier.
  3. Another 2.5 Million KRW: Spent on Public Transport.
    • Calculation: 2,500,000 * 40% = 1,000,000 KRW deduction.
    • Result: This goes into your Additional Limit.

Total Benefit: You subtracted 4,000,000 KRW from your taxable income. For a person in the 15% tax bracket, this equals 600,000 KRW in cash savings!

5. What is NOT Counted? (Important)​

Even if you pay by card, the following items DO NOT count towards your tax deduction:

  1. Overseas usage (Spending while traveling outside Korea).
  2. New Car Purchases (Buying a used car counts at 10% of the value).
  3. Utility & Bills: Insurance premiums, school fees, electricity, water, gas, and apartment maintenance fees.
  4. Special Fees: Car rentals and purchase of gift certificates.

[!SUMMARY] Use Credit Cards for your initial fixed expenses until you hit 25% of your salary. Then, switch completely to Check/Debit Cards and ensure you register your phone number at Hometax to issue Cash Receipts for all cash spending.