Parking accounts versus CMAs — choosing an account that pays interest for a single day
There is always money that sits still for a while — the balance between payday and the credit card bill, or a deposit waiting for a lease to be signed. A term deposit locks it away, and an ordinary current account pays almost nothing. Parking accounts and CMAs fill that gap. The two names get used interchangeably, but they invest your money differently and they protect it differently when something goes wrong. Here is what separates them, and what a single day of interest actually amounts to.
What a parking account actually is
"Parking" is the same idea as parking a car: somewhere to leave money briefly. It is a nickname rather than a product category. In practice it refers to instant-access deposit accounts from banks and savings banks that pay an unusually high rate.
Two features matter. First, you keep the interest no matter when you withdraw. Break a term deposit early and you fall back to a penalty rate; a parking account credits interest for each day the money was there. Second, interest accrues daily but is paid on a schedule — monthly at some institutions, quarterly at others. That detail is in the product terms, not the advertisement.
CMA versus parking account — deposit protection is the dividing line
A CMA is a securities account. Rather than holding your cash, it automatically invests it in short-term instruments such as government bonds or notes. The suffix on the product name tells you which, and it matters.
- RP type: the broker invests through repurchase agreements. A projected yield is shown in advance, but the balance is not covered by deposit insurance.
- Note-issuance type: large brokerages that meet capital requirements invest through notes they issue themselves. Again not insured — the issuer's credit is the risk.
- MMF and MMW types: returns follow actual performance. There is no fixed rate.
- Merchant-bank type: offered only by firms holding a merchant banking licence, and this one is covered by deposit insurance.
Parking accounts at banks and savings banks, by contrast, are covered, up to the statutory limit per person per institution including accrued interest. When two products advertise a similar rate, this is the difference that should decide it.
How this differs from deposits and instalment savings
A term deposit pays more because you promise to leave the money for a fixed period. A parking account asks for no promise and normally pays less in return. If you know when you will spend the money, use a term deposit; if you do not, use a parking account.
Instalment savings are a different animal again. Because each monthly payment sits for a different length of time, the headline rate never applies to the whole balance. That arithmetic is covered in the difference between deposits and instalment savings.
One day of interest — the real number
It helps to set expectations precisely. On a 3.0 per cent product, 5 million won left for a single day works out like this.
- Gross daily interest = 5,000,000 × 3.0% ÷ 365 ≈ 411 won
- After 15.4 per cent withholding tax (14% income tax plus 1.4% local tax) ≈ 348 won
- Leave it for thirty days and you have roughly 10,000 won after tax
The figures make the point: small sums parked for a few days are not worth chasing. These accounts earn their keep when the balance is large or the wait is long — a lease balance sitting for two months, for instance.
Three things to check in the rate terms
The advertised maximum is rarely what you receive. Check these before opening an account.
- Balance caps: "3.0 per cent up to 50 million won, 0.1 per cent above" is a common structure. Money above the cap effectively earns nothing.
- Bonus conditions: first-time customer status, marketing consent, salary transfers, card spending. Ask whether the condition must be met every month or only once.
- Payment schedule: interest accrues daily but is credited monthly or quarterly. Close the account just before a payment date and some products pay nothing for that period.
With savings banks, spreading balances across institutions keeps everything inside the insured limit — a simpler safeguard than trying to judge a single firm's health.
Which money belongs where
Splitting accounts by purpose makes the decision easy. A month of living costs stays in the salary account; money you will spend within months goes to a parking account or CMA; anything you can lock away for a year or more goes into a term deposit.
If you also invest, it is worth checking whether cash is sitting idle in your brokerage account. Linking it to a CMA earns a daily return even while you wait to buy. Just remember that most CMA types are outside deposit protection.
The habit of dividing accounts by purpose is covered in saving habits that stop your paycheck leaking, and forgotten balances can be traced through finding unclaimed refunds.
In summary
A parking account is an instant-access deposit that pays interest for a single day; a CMA is a brokerage account that invests your cash in short-term instruments. The decisive difference is not the rate but deposit protection — every CMA type except the merchant-bank version sits outside it. At 3 per cent, five million won earns about 350 won a day after tax, so size and duration are what make it worthwhile. Before opening one, check the balance cap, the bonus conditions and the payment schedule.
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