Why Bank Fixed Deposit Rates Deceive
When an investor sees a 12-month fixed deposit offering 9.00% gross interest, it sounds competitive against unit trusts. However, under the South African Income Tax Act, 100% of interest above the modest R23,800 annual exemption is taxed at your full marginal income tax rate (up to 45%).
A R1,000,000 deposit at 9.00% generates R90,000 gross interest. After R23,800 exemption, R66,200 is taxed at 41% = R27,142 in tax.
Inside a Collective Investment Scheme, internal rebalancing is CGT roll-over exempt under Section 9C. Capital growth compounds year-on-year with R0.00 annual tax drag.
Equity cash dividends are subject to a flat 20% DWT at source under Section 64EA, completely bypassing your high personal marginal income bracket.
The 4 Distinct Tax Streams in South Africa
Unlike a bank fixed deposit where 100% of return is taxed as ordinary income, a unit trust produces returns taxed under four distinct statutory regimes:
Earned from cash, bank deposits, fixed-rate bonds, and floating notes. Added directly to your taxable income and taxed up to 45%.
Distributions from South African Real Estate Investment Trusts. By law, classified as taxable income.
Cash distributions from domestic and foreign equity shares. Withheld automatically at source before payout.
Share price & NAV appreciation. Individuals receive a 40% inclusion rate. Incurred only upon sale/redemption.
Statutory South African Tax Rates Comparison Matrix
Official tax rates by individual income tax bracket under the 2026/2027 SARS tax tables:
| Taxable Income Bracket (SARS) | Marginal Income Tax Rate | Interest Income Tax Rate | SA REITs Tax Rate (s25BB) | Dividends Withholding Tax (s64EA) | Effective Capital Gains Tax Rate (40% inclusion) |
|---|---|---|---|---|---|
| R0 – R237,100 | 18.0% | 18.0% | 18.0% | 20.0% | 7.2% |
| R237,101 – R370,500 | 26.0% | 26.0% | 26.0% | 20.0% | 10.4% |
| R370,501 – R512,800 | 31.0% | 31.0% | 31.0% | 20.0% | 12.4% |
| R512,801 – R673,000 | 36.0% | 36.0% | 36.0% | 20.0% | 14.4% |
| R673,001 – R857,900 | 39.0% | 39.0% | 39.0% | 20.0% | 15.6% |
| R857,901 – R1,817,000 (Common Top Bracket) | 41.0% | 41.0% | 41.0% | 20.0% | 16.4% |
| Above R1,817,000 (Maximum Bracket) | 45.0% | 45.0% | 45.0% | 20.0% | 18.0% |
Asset Weightings vs. Annual Taxable Realization
Why your annual SARS IT3(b) tax certificate does not match the fund's asset allocation:
A common misconception among investors is assuming that a fund with 60% equities and 40% bonds will generate a static 60% capital gain and 40% interest income tax bill each year. In reality, your actual tax certificate fluctuates wildly based on market conditions during that tax year:
Scenario 1: Bull Market Expansion (+20% Equities)
In a strong market year where equities rise +20% and bonds yield 8%, capital growth represents over 75% of your total return. Because capital gains remain unrealized inside the unit trust, zero immediate tax is triggered on that growth.
Scenario 2: Bear or Flat Market (-5% Equities)
In a weak equity year where shares drop -5% while bonds yield 9%, the only positive cash returns distributed to you are coupon interest payments.
Under the South African Income Tax Act (Section 9C and Eighth Schedule), Collective Investment Schemes (CIS) are classified as rollover-exempt conduits. When a portfolio manager rebalances internal holdings—selling one stock to buy another—the fund incurs no immediate Capital Gains Tax.
This creates a tremendous compounding advantage over direct discretionary share portfolios: the gross return continues to generate compound growth on pre-tax capital until the day you decide to redeem or switch units.
How the Blended Effective Tax Rate is Calculated
For any multi-asset fund or blended portfolio, the total tax drag is the weighted sum of taxes across the four streams: