After-tax outcomes of a TFSA versus a retirement annuity.
Better after-tax option
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RA net value
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TFSA net value
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Two tax breaks, at opposite ends
A retirement annuity and a tax-free savings account both shelter your money from tax, but they do it at different moments, and that single difference drives the whole comparison. The retirement annuity gives its break upfront: contributions are deductible, so SARS effectively refunds part of what you put in, and the tax only arrives later when you draw the money in retirement. The TFSA gives its break at the back end: there is no deduction going in, but every cent of growth and every withdrawal comes out tax-free, forever. This calculator models both paths and tells you which leaves more in your hands after tax.
The clever part of the tool is what it does with the RA refund. Rather than letting the upfront tax saving vanish into spending, it assumes you reinvest the refund, so a deductible contribution effectively buys you a larger investment than the same cash would in a TFSA. That is the RA's structural advantage, and it compounds for decades.
The upfront refund that compounds
The deduction is capped. Contributions are deductible up to 27.5 percent of income, limited to R350,000 a year, the figures this calculator applies. Within that cap, the refund is your contribution multiplied by your marginal rate, and the tool adds that refund back to the amount invested in the RA each year. The TFSA, by contrast, has its own caps that this calculator respects, R36,000 a year and R500,000 over a lifetime, with a stiff penalty on anything above them. When the comparison reaches retirement, the RA pot is taxed on the way out; this calculator assumes an effective 18 percent rate on RA drawdown income, which is a modelling assumption rather than a fixed SARS figure, and your real rate depends on your total income in retirement. The TFSA pot is handed over untouched.
R36,000 a year for 25 years
Take R36,000 a year for 25 years at a 9 percent return, a 36 percent marginal rate today, and R600,000 of taxable income. The full R36,000 is deductible, so the refund is R12,960, lifting the yearly RA investment to R48,960. Grown for 25 years that becomes about R4.15 million, and after the assumed 18 percent drawdown tax it is worth roughly R3.40 million. The TFSA, funded with R36,000 a year and never taxed, grows to about R3.05 million. On these inputs the retirement annuity comes out ahead by around R351,000.
| Step | Retirement annuity | TFSA |
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Where the drawdown assumption bites
The result hinges on two rates: your marginal rate today and your effective rate in retirement. The RA wins when you contribute at a high rate, say 36 or 45 percent, and draw later at a lower one. Lower your marginal rate to the low 20s in the calculator and the gap narrows sharply, because a smaller refund buys a smaller head start while the RA still suffers drawdown tax. If your retirement income is large, your real drawdown rate could exceed the 18 percent this calculator assumes, eroding the RA advantage further. The honest answer is that for many high earners the RA wins, for flexibility-seekers and lower brackets the TFSA is compelling, and a great many people sensibly do both.
One edge case the tool flags: if you push the annual amount above R36,000, a TFSA cannot absorb the excess without a penalty, so beyond that point the comparison is no longer apples to apples. The RA can take far larger annual contributions within its percentage cap, which is part of why high earners lean on it for the bulk of their retirement saving and reserve the TFSA for its flexibility.
Can I take my RA money out before retirement like a TFSA?
No, and this is the central trade-off. A TFSA is fully liquid; you can withdraw any time, though you do not get the contribution room back. A retirement annuity is locked until at least age 55, and even then only up to one-third can be taken as a lump sum, with the rest providing an income. The new two-pot system lets you access a limited savings portion of new contributions once a year, taxed at your marginal rate, but the bulk stays preserved to retirement.
Does the TFSA limit or the RA cap reset each year?
The TFSA R36,000 annual limit resets every tax year, but the R500,000 lifetime limit never refreshes, and unused annual room is lost rather than carried forward. The RA deduction cap of 27.5 percent of income, limited to R350,000, applies each year and is not cumulative, though contributions that exceed the cap in one year can be carried over and deducted in future years.