Investing
Investment Calculator South Africa 2026
Project compound investment growth for JSE shares, ETFs, unit trusts and TFSAs. Compare lump-sum and monthly contributions and see your real, after-inflation returns.
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Investment growth
Live compound-interest projection · JSE, TFSA & ETFs · 2026
Mixed portfolio approach
R
One-time lump sum (optional)
R
Regular monthly debit order
20 years
Conservative: 9–11% nominal
Future value
R3 450 081
after 20 years at 12% p.a.
Total contributions
R770 000
Interest earned
R2 680 081
Real value (after inflation)
R1 075 751
Effective return
348.1%
Investing R50 000 upfront plus R3 000 per month for 20 years at 12% a year in a General Investment could grow to about R3 450 081 — around R1 075 751in today's money after inflation, from R770 000 of contributions.
Growth timeline
Year 1
R94 048
Growth: R8 048
Year 2
R143 640
Growth: R21 640
Year 3
R199 477
Growth: R41 477
Year 4
R262 344
Growth: R68 344
Year 5
R333 126
Growth: R103 126
… and 5 more years
Good to know
- Past performance doesn't guarantee future returns — all investments carry risk.
- A Tax-Free Savings Account (R36,000/year) shelters growth from CGT, dividends and interest tax.
- Always check the real, after-inflation value to judge true buying power.
- This is an independent estimate, not financial advice — consult a qualified advisor.
Best investment options in South Africa
Building wealth in South Africa usually means combining a few low-cost, long-term options. Understanding what each one does helps you decide where your monthly contribution should go first.
JSE shares & ETFs
Direct equity exposure to South African and global companies. Low-cost index ETFs (e.g. Satrix, Sygnia) are a simple way to track the market.
Unit trusts
Professionally managed, diversified funds. Convenient but watch the annual fees, which compound against you over time.
Offshore investments
Global exposure helps protect against rand weakness and diversifies beyond the local market.
Tax-Free Savings Account
R36,000 per year (R500,000 lifetime) of 100% tax-free growth — usually the first place to invest.
Simple strategies that work
Start early
Time is the biggest driver of compound growth. A few years earlier can outweigh much larger contributions later.
Invest monthly
Regular debit orders (rand-cost averaging) keep you investing through market ups and downs without trying to time it.
Use your TFSA first
Fill the R36,000 annual tax-free allowance before taxable accounts to keep 100% of your growth.
Keep fees low
Low-cost ETFs and index funds preserve more of your returns — fees compound against you just like growth compounds for you.
An honest reality check
Be conservative with returns
Use a nominal return of around 9–11% (about 5–7% after inflation) for planning, rather than the best historical years.
Watch out for tax in taxable accounts
CGT, 20% dividends tax and interest tax can quietly erode returns outside a TFSA — factor it into your real growth.
Inflation matters
A nominal balance can look large, but always check the real, after-inflation value to judge true buying power.
Time in the market
Staying invested for the long term consistently beats trying to time entries and exits.
Frequently asked questions
Quick answers to the most common questions.
How does compound interest grow my investment?
Compound growth means your returns earn returns. Each year your gains are added to the balance, so the next year you earn growth on a larger base. Over long periods this snowballs — most of a 30-year portfolio's final value comes from compounding, not your original contributions. Starting early matters far more than the amount you invest.
What is a realistic return to assume for JSE shares or ETFs?
A broad JSE or balanced equity ETF has historically returned roughly 10–14% per year before inflation over long periods, but with big swings year to year. For planning it is safer to use a conservative nominal figure of around 9–11%, or a real (after-inflation) return of about 5–7%. Higher assumptions make projections look impressive but unrealistic.
Is it better to invest a lump sum or a monthly amount?
If you already have the cash, a lump sum is mathematically usually best because it is invested for longer. For most people, though, regular monthly debit orders (rand-cost averaging) are more practical: you invest steadily regardless of market level, build discipline, and avoid trying to time the market. Many investors combine both.
Do I pay tax on my investment returns in South Africa?
In a normal (taxable) account, yes — capital gains are taxed via CGT, local dividends carry 20% dividends withholding tax, and interest above the annual exemption is taxed at your marginal rate. A Tax-Free Savings Account avoids all of this, which is why filling your R36,000 annual TFSA allowance first is usually the most efficient option.
How does inflation affect my investment?
Inflation reduces what your money can buy. If your investment grows 10% in a year but inflation is 5%, your real gain is only about 5%. When projecting long-term goals, look at the real (after-inflation) value, not just the nominal rand figure, so you do not overestimate your future buying power.