2026 Installment Savings vs Time Deposits vs CMA — Short-Term Cash Management Yield Comparison

Key Summary Even amid the rate-cutting trend in 2026, online-bank parking accounts (3.0-3.5% p.a.) and brokerage issued notes (3.5-4.0% p.a.) remain key options for short-term cash management. For money you will use within 6 months, a CMA or parking account is better; for money you can leave untouched for at least 1 year, a time deposit is more advantageous.

Short answer: In 2026, CMAs and parking accounts are favorable for short-term cash management.

Basic Comparison by Product Type

Summary of Key Features

Installment Savings — The Power of Forced Saving

How to Calculate Net Proceeds from Installment Savings

월 100만원 × 12개월 적금, 연 4.0% 금리 기준:
총 납입액: 1,200만원
이자 계산: 100만원 × 4.0% × (1+2+3+...+12)/12
         = 100만원 × 4.0% × 6.5 = 26만원
세전 이자: 260,000원
이자소득세 (15.4%): -40,040원
실수령 이자: 219,960원

Installment savings interest should not be calculated simply as principal x rate. Because contributions are made over 12 months, the average balance is roughly half the total contribution amount.

Comparison of High-Rate Installment Savings Products in 2026

Time Deposits — The Stability of a Fixed Rate

Calculating Net Proceeds from Deposits

1,000만원 × 12개월 × 연 3.5%:
세전 이자: 350,000원
이자소득세 (15.4%): -53,900원
실수령 이자: 296,100원
실질 수익률: 2.96%

Deposit Rate Comparison (as of June 2026)

Tip: Savings bank deposits are also protected up to KRW 50 million under the Depositor Protection Act. Use them when the rate gap is meaningful.

CMA — Balancing Liquidity and Returns

Comparison by CMA Type

Brokerage CMA Issued Note Rates (2026)

Parking Accounts — Interest That Never Takes a Day Off

Parking Account Rate Comparison (as of June 2026)

Daily Interest Calculation for a Parking Account

1,000만원 × 연 3.5% ÷ 365일 = 958원/일
한 달(30일) 이자: 28,740원
연 이자(세전): 350,000원

KRW 10 Million Short-Term Management Simulation

Best Choice by Investment Period

💡 Compare rates here! You can compare deposit and installment savings rates by bank in real time on the Financial Supervisory Service's financial product comparison disclosure site (finlife.fss.or.kr). For parking accounts and CMAs, check directly in each financial company's app.

📣 Paid relationship disclosure: This post is educational content intended to provide information that helps readers choose financial products. It has not received advertising fees or sponsorship from any specific financial company. Rates change over time, so be sure to check the latest rates directly with each financial company.

Frequently Asked Questions (FAQ)

Q1. How much interest do I lose if I cancel an installment savings account early? A. Most installment savings accounts apply an early-cancellation rate of about 10-30% of the contracted rate. For example, if you cancel a 4.0% p.a. installment savings account after 6 months, you may actually receive only about 0.5-1.0% p.a. in interest. If the money is short-term cash, use a parking account or CMA.

Q2. Are issued note CMAs not covered by depositor protection? A. Correct. Brokerage issued notes are not covered by the Depositor Protection Act. However, as long as the brokerage does not go bankrupt, you can receive principal plus interest. If you use a large brokerage, the practical risk is low.

Q3. Does the 15.4% interest income tax apply to everyone? A. This is the standard taxation rate. If your annual financial income exceeds KRW 20 million, you become subject to comprehensive taxation on financial income and may be taxed at up to 49.5% (top marginal rate plus local tax).

Q4. Which is better, a parking account or a CMA RP type? A. CMA issued notes offer higher rates, but they are not covered by depositor protection. Parking accounts are safe within the KRW 50 million depositor protection limit and are convenient to use. For short-term cash of KRW 100 million or less, a parking account is reasonable; above that, diversification is more sensible.

Q5. Are MMFs also safe investment vehicles? A. MMFs are funds that invest in short-term bonds and do not guarantee principal. Historically, principal losses have been rare, but short-term losses are possible during market shocks. Their risk is slightly higher than CMA RP types or parking accounts.

Q6. Why do savings bank time deposits pay higher rates than major banks? A. Savings banks have higher funding costs than major banks and need to offer higher rates to attract depositors. Depositor protection applies equally up to KRW 50 million, so they can be used safely within that amount.

Q7. Is there a strategy for using installment savings and deposits together? A. Yes. For example, if you have KRW 30 million, an effective "three-way split strategy" is to put KRW 10 million into installment savings (forced saving), KRW 10 million into a parking account (emergency fund), and KRW 10 million into a time deposit (fixed return).

Q8. Can I save taxes by using a tax-exempt comprehensive savings account? A. Yes. People eligible for tax exemption, such as those aged 65 or older or people with disabilities, can avoid the 15.4% interest income tax through tax-exempt comprehensive savings (up to KRW 50 million). If you qualify, be sure to use it.

Reference: KOSIS Korean Statistical Information Service