Rental Cash Flow Calculator South Africa 2026
Monthly cash flow after bond repayment, vacancy allowance and all operating expenses
Negative cash flow of R 6 252/month. You will need to top up from other income. This is common in SA given current interest rates.
Calculator Features
How to Use This Calculator
Enter your property value, bond amount, and bond details (rate and term). Add your monthly rent and set a vacancy rate. Fill in all monthly operating expenses: rates, body corporate levy, insurance, maintenance provision, and management fee (if using an agent). The calculator deducts the bond repayment to show true monthly cash flow — the actual rand amount in your pocket each month.
Cash Flow vs Yield: What's the Difference?
Rental yield
Yield compares income to property value and ignores financing. It tells you how hard the asset works as an income generator. Yield is useful for comparing unfinanced properties.
Cash flow
Cash flow is what you actually experience as a landlord — the difference between what comes in (rent) and what goes out (bond repayment + all expenses). Negative cash flow means you top up monthly; positive means you receive money.
− Rates & Taxes
− Levy
− Insurance
− Maintenance
− Management Fee
− Bond Repayment
= Net Cash Flow
The vacancy factor
No property is occupied 100% of the time. A conservative assumption is 1–2 months vacancy per year (8–17%). Budget for this by reducing effective monthly income accordingly, or maintain a cash reserve to cover vacant periods.
Cash Flow Reality in South Africa in 2026
With the prime lending rate at 10.25%, most South African buy-to-let properties are cash-flow negative after bond repayments. This is a structural feature of the current market — bond repayments are high relative to achievable rents in most suburbs.
A R1 500 000 property with R12 000/month rent and R1 350 000 bond at 10.25% over 20 years requires a bond repayment of ~R13 300/month. Even with zero vacancies and minimal costs, cash flow is negative.
Most South African investors accept this and focus on long-term capital appreciation and equity accumulation. The monthly shortfall is viewed as a forced savings contribution. Cash-flow positive properties are most commonly found in:
- High-yielding nodes (student accommodation, rooms-to-rent)
- Commercial or industrial properties
- Properties with large deposits reducing the bond amount
- Properties bought below market value
Worked Example
Precious buys a R1 500 000 two-bedroom flat in Pretoria East with a 10% deposit. Bond: R1 350 000 at 10.25% over 20 years = R13 300/month. Rent: R12 000. Monthly expenses: rates R1 500 + levy R2 500 + insurance R500 + maintenance R500 = R5 000. Management fee: 8% = R960. Vacancy: 8.3% = R996/month.
Effective income: R12 000 − R996 = R11 004
Operating expenses: R5 000 + R960 = R5 960
NOI: R11 004 − R5 960 = R5 044
Bond repayment: R13 300
Monthly cash flow: −R8 256
Precious tops up R8 256/month. Over 20 years, this is approximately R1 981 440 in top-ups. However, her property value (at 5% p.a.) grows to R3 982 300 — a capital gain of R2 482 300. Net total return: ~R500 860 profit over 20 years.
Frequently Asked Questions
Why is my rental cash flow negative in South Africa?
With prime at 10.25%, bond repayments on a typical buy-to-let are much higher than achievable rent in most suburbs. The typical rent-to-value ratio in South Africa is 6–9% gross (0.5–0.75% per month), while bond repayments plus expenses consume more. This is normal — most investors are willing to top up monthly in exchange for long-term capital appreciation.
What is a realistic vacancy rate for South African rental properties?
In strong rental markets (Cape Town, Sandton, Umhlanga), vacancy rates can be very low — under 5%. In weaker markets or with poorly located properties, expect 10–20%. A conservative national average is 8–10% (approximately 1 month per year). Always budget for vacancy — it is one of the biggest destroyers of rental yield for unprepared investors.
Can I deduct the bond repayment on my tax return?
No. You can deduct bond interest (not the capital repayment portion) against rental income. The capital portion builds equity — it is not an expense. To determine your deductible interest, request an annual amortisation statement from your bank. Other deductible expenses include rates, levy, insurance, maintenance, management fees, and municipal charges.
How much should I budget for maintenance on a rental property?
A commonly used rule of thumb is 1% of property value per year for maintenance (approximately R1 250/month on a R1 500 000 property). Older properties, harsh coastal environments, and properties with pools or lifts require more. This provision should cover routine repairs, appliance replacements, and periodic refreshes between tenants.
What is the difference between NOI and net cash flow?
Net Operating Income (NOI) is rent minus all operating expenses — before financing. It is used to calculate cap rate and compare properties regardless of how they are financed.
Net Cash Flow is NOI minus bond repayment. It is the actual rand amount you receive or pay out each month as an investor with a bond. NOI may be positive while cash flow is negative if bond repayments exceed NOI.