Fixed Deposit Calculator

How the Fixed Deposit Calculator Works

A fixed deposit (also called a term deposit or fixed-term investment) is a savings product where you lock a lump sum with a bank for a specified period at a fixed interest rate. In exchange for the certainty of the fixed rate, you typically cannot access the funds before maturity without a penalty.

South African banks offer two main interest payout options. With compound interest (reinvested), all interest is added back to the principal each period and earns further interest - you receive the full accumulated amount at maturity. The formula is:

With simple interest (paid monthly), the interest is calculated only on the original principal and paid to your transactional account each month. This provides a regular income stream but results in a lower total return than compound interest over the same period, since the monthly interest payments do not themselves earn interest.

The calculator shows both scenarios side by side so you can compare the maturity value of compound reinvestment versus the monthly income from simple interest payout. Which is better depends on whether you need the monthly income or prefer to maximise the final amount.

How to Use This Calculator

1. 1

   Enter the principal amount

   This is the lump sum you plan to invest. South African fixed deposits typically require a minimum of R1 000–R10 000 depending on the bank and product. Larger deposits often qualify for higher interest rates - ask your bank for a tiered rate schedule.

2. 2

   Enter the interest rate

   Use the rate quoted by your bank for the specific term and amount. Fixed deposit rates at South African banks currently range from 9.5% to 11.5% for 12-month terms, depending on the amount and bank. Shop around - rates differ meaningfully between banks and between branch and digital channels.

3. 3

   Set the term

   Fixed deposit terms in South Africa range from 1 month to 60 months. Longer terms generally attract higher rates. The optimal term depends on when you need the funds - avoid locking money you might need before maturity, as early withdrawal penalties are typically 1–3 months' interest.

4. 4

   Choose compound or monthly payout

   Select compound (reinvested) if you do not need regular income and want to maximise the maturity value. Select monthly payout if you are using the deposit to supplement monthly income - for example, in retirement. The calculator shows the difference so you can make an informed choice.

5. 5

   Compare rates across banks

   Run the calculator at different rates to see the rand difference between a 10% and 11% fixed deposit on R500 000 over 12 months - it is approximately R5 000 extra. Use comparison sites or call multiple banks directly. Smaller banks and digital-first banks (African Bank, TymeBank) sometimes offer higher rates than the big four.

Frequently Asked Questions

What are the best fixed deposit rates in South Africa?

As at mid-2025, 12-month fixed deposit rates at South African banks range from approximately 9.5% (major commercial banks for smaller amounts) to 11.5% (African Bank, Capitec, Investec for larger deposits). Rates are updated regularly and depend on the amount, term, and bank. The SARB repo rate significantly influences all fixed deposit rates - when the repo rate falls, fixed deposit rates follow. Shop around using comparison platforms or call your bank's investment line directly.

Is a fixed deposit safe in South Africa?

Fixed deposits at South African banks registered with the Prudential Authority are not formally covered by deposit insurance at this time - South Africa does not yet have a national deposit insurance scheme, though legislation to introduce one was progressing as at 2025. In practice, the probability of a major South African bank failing is very low, and the SARB has historically acted to protect depositors. Spreading large amounts across multiple banks is prudent for amounts above R500 000.

Can I withdraw a fixed deposit early in South Africa?

Most South African banks allow early withdrawal with a penalty, typically 1–3 months of interest foregone. The penalty is higher for longer-term products. Some products are 'hard fixed' - no early access under any circumstances. Read the terms carefully before placing the deposit. If you might need the funds before maturity, consider a 32-day or 60-day notice deposit instead, which offers similar rates with more flexibility.

Is interest on a fixed deposit taxable in South Africa?

Yes. Interest earned on a fixed deposit is taxable as income in the year it is received (or accrued, if you are on the accrual basis). SARS provides an annual exemption: R23 800 for individuals under 65, and R34 500 for those 65 and older. Interest above this threshold is taxed at your marginal income tax rate. The bank will issue an IT3(b) tax certificate showing interest earned, which you report on your ITR12 return.

What is the difference between a fixed deposit and a notice deposit?

A fixed deposit locks your money for a specific term (1–60 months) at a fixed rate. You cannot access it before maturity without a penalty, but you know exactly what you will earn. A notice deposit (32-day, 60-day, or 3-month notice) can be accessed by giving the required notice period. The rate is often comparable to a fixed deposit but adjusts periodically - so you bear interest rate risk. Notice deposits suit funds you may need in 1–6 months; fixed deposits suit funds you can commit for longer.

Should I use a fixed deposit or a money market fund in South Africa?

Both are appropriate for capital preservation with reasonable returns. A fixed deposit offers a guaranteed rate for the full term - useful if you believe rates will fall. A money market fund offers daily liquidity and tracks short-term rates - better if you need flexible access or believe rates will rise. Money market funds currently yield 9–11%, competitive with fixed deposit rates. Tax treatment is the same (interest taxed at marginal rate). For amounts above the TFSA threshold, consider whether a tax-free money market fund is available.