November 2026
| Term | Minimum | This month | vs last |
|---|---|---|---|
| 2 years | R1,000 | 8.25% | flat |
| 3 years | R1,000 | 8.50% | flat |
| 5 years | R1,000 | 9.00% | flat |
| Term | Minimum | This month | vs last |
|---|---|---|---|
| 3 years | R1,000 | CPI + 4.25% | flat |
| 5 years | R1,000 | CPI + 4.50% | flat |
| 10 years | R1,000 | CPI + 4.75% | flat |
| Term | Minimum | This month | vs last |
|---|---|---|---|
| 3 years | R500 | 8.50% | flat |
Read the curves, then go and hold.
Treasury sets the rate on the day you buy. After that, every coupon arrives on the date it was always going to arrive, and the capital comes back the day the bond matures. The curves move; your bond doesn't. That's the deal.
Find the right CPI value
StatsSA releases headline CPI (P0141) mid-month, with a roughly four-week lag. Treasury uses a t−3 month convention: the reference CPI for any given day is linearly interpolated between the CPI prints from three and four months prior.
CPI_ref(d) = CPI(t−4) + (day(d) − 1) / days_in_month
× ( CPI(t−3) − CPI(t−4) )Inflate the principal
The ratios today's reference CPI against the reference CPI on your settlement date. It moves with realised inflation, so indexed capital can dip if CPI falls. Only the amount repaid at maturity has a floor: Treasury tops it up to your original capital.
Indexation Factor = CPI_ref(today) / CPI_ref(settlement) Indexed Principal = Initial Principal × Indexation Factor
Apply Treasury's real rate
The number Treasury publishes monthly (e.g. CPI + 4.25%) is the — the rate above inflation. The rand cashflow is half-yearly: indexed principal times the real coupon, divided by two.
Half-yearly Coupon =
Indexed Principal × Real Coupon / 2
At maturity:
Capital returned =
max(Initial, Indexed Principal)Buy R100,000 of a 5y Inflation-Linked at CPI + 4.25% on 1 May 2026. Suppose realised CPI runs at 5% per year for the next twelve months.
- 1 May 2027 indexation factor = 1.05
- Indexed principal = R100,000 × 1.05 = R105,000
- 6-month coupon (Nov 2026) ≈ R102,500 × 4.25% / 2 = R2,178
If CPI then runs another year at 5%, by maturity:
- Cumulative indexation ≈ 1.055 = 1.276
- Capital returned ≈ R127,628
- Plus 10 half-yearly real coupons across rising indexed principal
- Approx total return: R155k–R160k on R100k face
Bond Club uses the StatsSA P0141 series to compute realised indexation. Where the CPI cache is still hydrating, we fall back to a 5% flat assumption and tag the resulting projection so you know which value drove the screen.
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