Compound interest: how money multiplies and why time beats amount
The formula in plain words, the rule of 72 and calculations that show why ten years of head start matter more than the size of your deposit.
To have an extra UAH 10,000 a month in today's money for 20 years of retirement, you need capital of about UAH 2 million. Starting at 30, that is roughly UAH 2,850 a month; at 40, UAH 5,400; at 50, already UAH 13,400 (assuming savings grow 4% a year faster than inflation). Ukraine's state pension depends on your insurance record and the salary on which the social contribution was paid, so your own savings are a way not to depend on it alone.
An old-age pension in Ukraine's pay-as-you-go system depends on two things: your insurance experience (how many years the single social contribution, ESV, was paid for you) and the salary on which it was paid. The longer the record and the higher the official salary, the larger the pension.
The experience requirements rise every year. According to the Pension Fund of Ukraine, retiring at 60 required 31 years of insurance experience in 2024, and the requirement grows by 12 months every year, reaching 35 years in 2028. So in 2026, retiring at 60 takes 33 years. People with less experience retire later, at 63 or 65, and at 65 the minimum requirement is 15 years.
The pay-as-you-go system runs on contributions from people working today. The size of a future pension also depends on government indexation decisions and on the ratio of workers to pensioners. So your own savings do not replace the state pension; they are insurance in case it is not enough.
Start with a question: how much money a month do you want on top of the state pension, and for how many years? Everything else follows from that.
Say you want an extra UAH 10,000 a month in today's money for 20 years, from 60 to 80. If you simply keep the money under the mattress, you need 10,000 × 240 = UAH 2,400,000, and in prices at the time you retire, not today's.
If the savings earn interest that at least slightly outpaces inflation, you need less: the remaining balance keeps earning while you draw it down.
In 25 years, UAH 10,000 will buy much less than it does today. Rather than guessing future inflation, it is easier to calculate everything in today's prices and use the real return instead of the nominal rate: how many percent faster your savings grow than prices. How to calculate it is explained in our article on inflation: for example, a deposit at 15%, after 23% tax and with 8% inflation, gives about 3.3% real return.
Now the key part: how much to save to have that UAH 1,976,740 in today's money by 60. The answer depends heavily on when you start.
The gap between starting at 30 and at 50 is almost fivefold in the size of the contribution. And you put in more of your own money too: UAH 1,025,280 starting at 30 against UAH 1,610,880 starting at 50. For the younger saver, compound interest does the rest.
| Real return | Start at 30 | Start at 40 | Start at 50 |
|---|---|---|---|
| 2% above inflation | UAH 4,012 | UAH 6,705 | UAH 14,894 |
| 4% above inflation | UAH 2,848 | UAH 5,390 | UAH 13,424 |
| 6% above inflation | UAH 1,968 | UAH 4,278 | UAH 12,062 |
Look at the last column: starting at 50, even a high return barely helps, because interest simply doesn't have enough time. Starting at 30, the gap between the cautious and the bold scenario is UAH 2,000 a month.
Retirement money is the longest-term money of your life, so three things matter: safety, after-tax return and the ability to leave it alone for decades.
The simplest option, but 23% tax is withheld from deposit interest, and the real return often barely beats inflation. For a retirement goal, a deposit works as the safe part, not as the main engine of growth. You can calculate after-tax income in the deposit calculator.
For individuals, income from Ukrainian government bonds is not included in taxable income, so at the same rate they pay more than a deposit. You can buy bonds with different maturities as a “ladder” and reinvest the coupons. More on the difference in “Deposit or government bonds”.
Private (non-state) pension funds and funds that invest in stocks and bonds can deliver higher returns over the long term, but without guarantees: their value fluctuates. Before trusting your money to any company, check it in the registers of Ukraine's National Securities and Stock Market Commission (NSSMC) and read carefully what fees it charges. A difference of 1-2% a year takes a noticeable part of the result over 30 years.
The calculations in this article are illustrative: returns are assumed and fixed, and taxes and fees are not counted separately. Actual results depend on the instruments, rates and inflation. This article is not financial or investment advice.