Investing in South Africa from Abroad: the 15% That Never Reaches You
If you invest into South Africa from abroad and the return comes as interest — a loan to a local company, a private credit arrangement, money advanced on loan account — there is a tax that comes off the top before anything reaches you.
It is 15%, it is final, and the person who has to deal with it is not you.
What it is, and what it replaces
Interest paid to or for the benefit of a foreign person, from a South African source, is taxed at:
a final withholding tax rate of 15% where exemptions or reduced rate does not apply
The word doing the work is final. This is not an advance against a bill settled later, and it is not an extra layer on top of ordinary income tax.
SARS's own worked example makes the structure explicit. A foreign lender earning R18,000 of South African interest has that amount in gross income — the source is South Africa — but the interest is then exempt from normal tax. The 15% withholding stands in place of the ordinary tax, rather than being added to it.
That is the reassuring half. Here is the half that catches people.
It is triggered when the interest falls due, not when it is paid
The rule is that interest is deemed paid on the earlier of two dates: when it is actually paid, or when it becomes due and payable.
A mere accrual is not enough — the tax authority's own explanatory material says so directly:
mere accrual will no longer be the basis for withholding
But once a right to demand payment exists, the clock has started, whether or not money has moved.
And it does not reverse. In one of SARS's examples, a foreign lender agreed in August to waive interest that had become due and payable on 31 July. The waiver came too late: the liability had already attached, because the interest was deemed paid when it fell due. Forgiving a debt after the trigger date does not undo the tax on it.
There is relief in one direction only. Where interest becomes irrecoverable, the Act provides for a refund of withholding tax already paid. That is a mechanism for a debt that goes bad, not for a change of mind.
Who actually has to do this
The obligation sits with the payer — the South African person paying the interest — not with the foreign recipient. In practice the money is deducted before it leaves, and the recipient's first sight of it is a smaller payment than the agreement suggested.
It also reaches further than a direct payment. The rule covers interest paid "to or for the benefit of" a foreign person, which includes payment to that person's nominee, representative or agent. Routing the money through somebody else does not change the character of who benefits.
Trusts are looked through rather than treated as a wall. In SARS's example, a South African trust with two beneficiaries — one local, one foreign, each with a vested right to half the income — attracts withholding on half the interest. The foreign beneficiary's share is caught; the local one is not.
The payer must hand the money to SARS by the end of the month following the month in which the interest was paid, together with the prescribed return.
The trap in "net of tax" agreements
If you have negotiated a return expressed after withholding tax, be sure everyone has done the arithmetic the same way.
SARS works a case where a lender is to receive 10% net of withholding tax on R100,000 — R10,000 in hand. Because the tax comes off the gross, the gross must be grossed up:
| Net the lender must receive | R10,000 |
| Gross interest required | R11,764.71 |
| Withholding at 15% | R1,764.71 |
The borrower is paying R11,764.71 to deliver R10,000. On a larger facility that gap is the difference between a deal that works and one that does not, and it is routinely missed when a term sheet says "net of taxes" without a gross-up clause.
Make sure you get the certificate
Something practical that is easy to let slide, and awkward to reconstruct a year later.
The payer must complete an IT3(b) — a certificate of income from investments — and provide it both to the foreign recipient and to SARS. It is the formal record of what was earned and what was withheld.
That document is the evidence of tax already suffered in South Africa. Whatever relief may be available where you live — and that is a question for an adviser in your own country, not for this page — the conversation starts with a certificate showing the amount withheld. Chase it at the time. A borrower who has moved on, changed accountants, or wound up is a poor source of paperwork in retrospect.
When the money moves early
The timing rule cuts both ways, which is worth a sentence because the intuition usually runs one way.
The trigger is the earlier of payment and the date the interest becomes due and payable. Most of the friction comes from interest that falls due before anyone pays it — but the reverse also happens. In one of SARS's examples, interest was contractually due four months after the year end, and the borrower paid it early. The earlier date governed, so the obligation arose on payment rather than on the later contractual date.
The practical consequence for both sides: the tax point is fixed by whichever event happens first, and neither party can move it by choosing when to transfer money. If you are modelling cash flows across a year end, model the trigger, not the transfer.
What this page does not tell you — and it matters here
The exemptions. There are statutory exemptions from this withholding, and we have not read them, so we are not describing them.
This is a more consequential omission than usual, so we would rather be blunt about it than let you draw the wrong conclusion: do not read "15% on South African interest" as universal. Categories of interest are carved out, and whether your particular arrangement falls inside or outside those carve-outs is the first question to put to a tax practitioner — before you assume either that you are caught or that you are safe.
Treaty relief. A double tax agreement between South Africa and your country may reduce the rate below 15%. How that is claimed in practice, and what declaration the payer needs from you, is not covered here.
Dividends. Returns that come as dividends rather than interest are a different withholding with its own rate and its own rules. Nothing on this page applies to them.
Securities transfer tax, brokerage and the tax treatment of any gain on disposal are all separate questions.
About the source
The rate, the timing rule, the grossing-up arithmetic and the worked examples come from SARS Interpretation Note 115, "Withholding tax on interest", dealing with sections 50A to 50H of the Income Tax Act, together with SARS's published page on withholding tax on interest.
Rates and rules change, and interpretation notes are reissued. This is general information, not tax advice — confirm the current position with SARS or a tax practitioner before structuring anything.
How does this affect YOUR Money OS?
A cross-border return quoted before tax is not the return you receive. If part of your net worth is lent into South Africa, the headline rate and the received rate differ by more than most people assume, and the difference is fixed by statute rather than negotiable with the borrower.
FAQ
What is the withholding tax on interest paid to a foreigner? A final withholding tax of 15% on interest paid, on or after 1 March 2015, to or for the benefit of a foreign person from a South African source — where no exemption or reduced rate applies.
Is it on top of normal income tax? No. It is final. SARS's example shows the interest falling into gross income and then being exempt from normal tax, so the 15% stands in place of ordinary tax rather than being added to it.
When is it triggered? On the earlier of the date the interest is actually paid and the date it becomes due and payable. A mere accrual is not enough.
If the lender waives the interest, does the tax fall away? Not if the waiver comes after the interest became due and payable — SARS's example is explicit that the liability stands. A refund is available where interest becomes irrecoverable.
Who pays it over? The payer of the interest, by the end of the month following the month of payment, with the prescribed return.
What if the return was agreed net of tax? The gross must be grossed up. To deliver R10,000 net, the gross interest is R11,764.71 and R1,764.71 is withheld.
Are there exemptions? Yes — the Act contains exemptions, and this page has not read them. Do not assume the 15% applies to every kind of South African interest, or that it applies to yours.
