Room Rental Income Calculator South Africa
Calculate net monthly income from renting spare rooms in your own home — including tax deductions, lodger profiles, and legal requirements
Understanding Room Rental Income in South Africa How it works • Tax • Legal requirements
How to Use This Calculator
Enter the number of rooms you plan to rent and the monthly rent per room (SA range R3,000–R8,000 depending on area, furnishings, and what is included). Enter your full household costs — the calculator proportionally allocates expenses between your personal use and the rental portion to estimate deductible expenses and your net income after tax.
Use the Lifestyle vs Income tab to explore tenant profiles, legal requirements, and when room rental makes practical sense.
Tax Treatment of Room Rental Income
Room rental income from your primary residence must be declared on your annual SARS ITR12 return. You can deduct a proportionate share of housing expenses based on the rental portion of the property:
Deductible expenses include (proportional share):
- Bond interest (not capital repayment) — Section 11(a) of the Income Tax Act
- Rates and taxes — proportional to rental use
- Levies — for sectional title properties
- Utilities — water, electricity
- Cleaning and maintenance of shared areas
- Wear and tear on furnishings used by lodgers
Capital repayments on your bond are not deductible. Be careful about CGT: if a room is used commercially, SARS may calculate a partial primary residence CGT exclusion when you sell.
Worked Example
Priya owns a 3-bedroom house in Centurion with a R18,000/month bond. She decides to rent out 2 bedrooms at R5,000 each. She pays R1,800/month in rates, R3,500 in utilities, and R999 for fibre.
Rental proportion: 2 lodgers ÷ 3 total occupants = 66.7%.
Deductible expenses: (R18,000 × 66.7%) + (R1,800 × 66.7%) + (R3,500 × 66.7%) + (R999 × 66.7%) + R1,000 cleaning + R500 wear ≈ R17,000/mo.
Gross rental income: R10,000/mo. Taxable income: R10,000 - R17,000 = net loss that offsets other income. Net cash in pocket: approximately R8,500/mo after cleaning and wear costs.
Frequently Asked Questions
Do I need to declare room rental income to SARS?
Yes. Room rental income from your own home is taxable income that must be declared on your annual ITR12 return. You may deduct a proportionate share of bond interest, rates, utilities, cleaning, and wear and tear. The rental proportion is calculated as the number of rooms rented divided by total occupants. SARS does not have a specific exemption for incidental room rental.
Does renting rooms affect my primary residence CGT exclusion?
Potentially, yes. If a room is used for commercial purposes (room rental), SARS may apportion the R2 million primary residence CGT exclusion. The portion of the property used commercially for the years it was rented does not qualify for the full exclusion. For small-scale room rental (1–2 rooms, main residence), the impact is usually minor, but consult a tax practitioner before selling.
Do I need a lodging house permit to rent rooms in South Africa?
This depends on your municipality's by-laws. Many municipalities require a lodging house permit if you have 3 or more unrelated paying occupants. In Cape Town and Johannesburg, informal room rental of 1–2 boarders is generally tolerated without a permit, but operating as a formal boarding house (3+ rooms, meals, services) may require registration. Always check your local municipal by-laws.
Does renting rooms affect my home insurance?
Yes — you must disclose rental use to your insurer. Failure to disclose that you have paying lodgers can void your building and contents insurance claim. Most insurers offer a commercial rental endorsement for an additional premium. Contents insurance for your lodger's personal belongings is their own responsibility — you are not liable for their possessions.
Does the Rental Housing Act apply to room rentals in my own home?
Yes. The Rental Housing Act 50 of 1999 applies to all rental of residential premises, including individual rooms in an owner-occupied home. This means: a written lease is strongly recommended, you must hold the deposit in an interest-bearing account, you cannot evict without a court order under the PIE Act, and the Rental Housing Tribunal handles disputes. Treating lodgers as informal arrangements does not remove these obligations.