Even after you get your paycheck, it can feel like money isn’t piling up in your bank account—everyone has probably experienced that. Just because we’re in a low-interest-rate era doesn’t mean it’s wise to give up on deposits. Especially if you want to grow a lump sum efficiently, it’s important to understand the difference between fixed deposits and regular savings.

Let’s start by organizing the most confusing part. A fixed deposit is a way to put a lump sum in all at once and leave it untouched for a set period. In other words, you lend money to the bank, and the bank pays you the agreed interest when the term matures. If you withdraw early, there are disadvantages—but in return, you can earn a relatively higher interest rate. A regular savings plan, on the other hand, is when you consistently deposit a fixed amount every month. Since you can start with a small amount, it’s good for people just starting out in their career or beginners in personal finance. To put it simply, the difference between fixed deposits and regular savings is whether you deposit a large sum at once or keep adding smaller amounts over time.

So, what should you choose in each situation? If you have a lump sum and want to grow it safely, fixed deposits are the answer. Your principal is guaranteed, and under Korea’s Deposit Insurance Act, up to 50 million won per person is protected. The big advantage is that it isn’t affected by market fluctuations like stocks or funds. On the other hand, if you want to build a saving habit by setting aside a fixed amount each month, regular savings plans are recommended. Even if the amount is small, you can still build a lump sum through consistent saving.

You also need a separate account for managing everyday expenses or salary. That’s what a savings deposit (a passbook account for withdrawals and deposits at any time) is for. You can freely deposit and withdraw whenever you want, but you should expect little to no interest. If you combine these three types of accounts according to your situation, you can manage your assets more efficiently.

The reason banks offer higher interest rates on fixed deposits is simple. Since depositors are essentially promising not to withdraw their money for a certain period, the bank can use those funds for long-term loans or investments. Meanwhile, with a passbook-style savings deposit, money can leave at any time, making it difficult for the bank to manage funds. That’s why there’s a difference in interest rates.

When choosing a fixed deposit, there are a few things to check. First, comparing interest rates across different banks is essential. Conditions vary by bank. Second, review the preferred interest rate conditions. If you meet certain requirements—such as having your salary transferred in or using a credit card—you can receive additional interest. Third, decide the deposit term carefully. You need to match it to your financial plan and your actual target timing, so you can avoid losses such as early termination.

Interest calculation methods are also important. Simple interest is calculated only on the principal, while compound interest adds interest to interest. For long-term investments, compound interest products are far more advantageous because the interest grows faster over time. For example, if you invest 1 million won at 10% compound interest, you’ll earn 100,000 won in the first year, 110,000 won in the second year, 121,000 won in the third year, and so on.

Here’s one more practical tip for real life. There’s a personal-finance method called “deposit laddering.” It involves signing up for fixed deposits with a set monthly amount and then reinvesting the deposits once they reach maturity. This lets you aim for compound interest effects while also spreading out maturity dates, so you can use your funds more flexibly when you need them. And if you need emergency cash, instead of canceling a fixed deposit, you can use it as collateral to take out a loan. That typically comes with a lower interest rate than an unsecured credit loan.

Ultimately, understanding the difference between fixed deposits and regular savings plans—and choosing according to your situation—is the key. If you have a lump sum, choose a fixed deposit. If you want to save steadily, choose a regular savings plan. For everyday transactions, manage them with a savings deposit. If you understand the pros and cons of each product and compare each bank’s conditions carefully, you can still grow your assets even in a low-interest-rate era.