Even when your salary comes in, the reality is that the money doesn’t really build up in your bank account. That’s a common concern for many office workers—but in situations like this, the most basic step is to properly understand and use the meaning of deposits.

Even in a low–interest-rate era, time deposits and savings deposits are still good tools for accumulating assets. If you want to grow a lump sum safely, a fixed-term deposit is an especially strong option. Today, I’ll break down exactly what a fixed-term deposit is and how you can use it.

To put it simply, a fixed-term deposit is a product where you deposit a certain amount of money with a bank for a set period, and you receive the interest agreed upon at maturity. You’re essentially lending money to the bank and getting interest in return. There’s a restriction that you can’t withdraw the money before the maturity date, but in exchange, you can earn much higher interest than you would with a regular account that allows free deposits and withdrawals. Usually, you can choose a variety of terms from 1 month to 5 years, and the interest rate depends on the bank and the term.

The difference from a savings plan is also important. With a savings plan, you consistently save a fixed amount every month and then, after a certain period, you receive the principal plus interest. Since you don’t need a large lump sum like you do with a fixed-term deposit—and you can start with small amounts—it’s more suitable for students or people who are early in their careers. However, the actual interest you receive is usually lower than with fixed-term deposits.

There’s also something called a savings deposit. This is an account like a passbook/checking-style account where you can deposit and withdraw at any time. It’s used for everyday transactions such as salary transfers, credit card payments, and paying bills/utilities. Liquidity is good, but the interest rate is typically very low.

The reason fixed-term deposit interest rates are higher is simple. From the bank’s perspective, customers promise not to withdraw their money for a certain period, so the bank can use that funds reliably for long-term loans or investments. Meanwhile, because savings deposits allow money to be withdrawn anytime, banks have less flexibility in managing funds, so the interest rates are lower.

Another important point is principal protection. In South Korea, under the Deposit Protection Act, up to 50,000,000 won per person is protected for both principal and interest. Even if a bank goes bankrupt, the Korea Deposit Insurance Corporation will pay out that amount, so you can truly feel at ease. Unlike stocks or funds, fixed-term deposits aren’t affected by market fluctuations, so there’s no risk of your asset value dropping sharply.

You should also think about who fixed-term deposits are suitable for. If you’re a short-term investor, fixing a lump sum for a short period—about 6 months to 1 year—lets you safely grow your money while earning relatively high interest and maximizing short-term returns. In particular, in periods when interest rates are rising, a short-term fixed-deposit strategy can be especially effective. For long-term investors, fixed-term deposits of 3 years or more are generally better. Thanks to compound interest effects, returns grow over time, enabling stable asset accumulation. These are a great choice for people who want to save long-term for things like wedding funds or money to buy a home.

When choosing a fixed-term deposit, there are a few things you should check. First, comparing interest rates is essential. You can compare fixed-term deposit and savings deposit interest rates by bank through the Consumer Portal of the Korea Federation of Banks, so it’s a good idea to review them carefully. Next, check the conditions for preferential interest rates. In most banks, you can receive a preferential rate if you meet conditions such as setting up a salary transfer, using a credit card, or subscribing to a savings plan.

You also need to choose the deposit term carefully. Generally, the longer the term, the higher the interest, but penalties and disadvantages may apply if you cancel early, so you should decide based on your funding plan and goals.

It also helps to know the difference between simple interest and compound interest. Simple interest is calculated only on the principal, while compound interest is calculated on both the principal and the accumulated interest. For example, if you invest 1,000,000 won at a 10% simple interest rate, you receive 100,000 won each year; with compound interest, the first year is 100,000 won, and the second year becomes 110,000 won, and so on. Over the long term, compound interest is much more advantageous, but if you’re investing for the short term, the difference might not be that significant.

Also, certain groups—such as those aged 65 and over, people with disabilities, and persons eligible for benefits as independence patriots—may be able to receive tax-exempt savings products, so it’s worth taking advantage of that.

As a personal finance tip, there’s a method called “deposit windmill.” This involves subscribing to fixed-term deposits with a certain amount every month, and then reinvesting the deposits whose maturity dates come due again. The advantages are that you can aim for compound interest effects and that maturity dates are spread out, making it easier to use your funds flexibly.

Also, commercial banks sometimes launch special high-interest promotional deposits. Because these products offer high rates, they often have strict eligibility requirements or short sales periods. It’s important to get the release information quickly and sign up in time.

If you need urgent cash, you can also take out a loan using the fixed-term deposit as collateral instead of canceling (terminating) the fixed-term deposit. Compared with ordinary unsecured credit loans, this usually offers lower interest and has the advantage of no early termination fees.

In the end, fixed-term deposits are truly good products for investors who want stable returns, but they aren’t right for everyone. It’s important to consider your financial situation, goals, and how much risk you can tolerate. By understanding the differences between fixed-term deposits and savings plans, as well as the concepts of simple and compound interest, and by comparing bank interest rates and preferential conditions, you can choose the right product for you and manage your assets more wisely.