Affordability Multi-Income Calculator

Determine your combined purchasing power. Combine multiple income streams, factor in current monthly debts, and see your maximum property price based on South African banking lending criteria.

Affordability Multi-Income Calculator

Rates Updated: May 2026

Monthly Income

Primary Gross Income (R)

Secondary Gross Income (R)

Monthly Expenses

Total Debt Repayments (R)

Car, Credit Cards, Personal Loans

Loan Details

Interest Rate (%)

Term (Years)

Maximum Property Price

Max Monthly Bond:

30% of Total Gross Income

Estimated Cash Required:

Transfer & Legal Fees (approx 5%)

How Banks Evaluate Joint Affordability

Applying for a home loan with a partner, family member, or co-buyer is one of the fastest ways to scale your purchasing reach. Banks evaluate your combined financial profile using a strict, regulated framework.

National Credit Act Capping Co-Signatory Policy

1. The 30% Gross Income Rule

In South Africa, commercial banks restrict your maximum monthly home loan installment to roughly **30% of your total combined gross monthly income**.

Gross Income Total: This is your total household earnings before tax and deductions are subtracted. Combining a primary and secondary income maximizes this baseline.
Risk Mitigation: This threshold protects buyers from becoming "house poor," leaving sufficient capital for income tax, medical aid, and living costs.
Interest Rate Cushion: Maintaining this buffer ensures that if the South African Reserve Bank (SARB) alters repo rates, your budget can absorb installment increases.

2. Net Surplus & Debt-to-Income (DTI)

While gross income sets your theoretical max ceiling, your **existing debt obligations** control your actual approval viability under National Credit Act regulations.

Sunk Obligations: Fixed debit orders like vehicle finance, retail cards, and personal loans are subtracted directly from your disposable footprint.
Net Disposable Income: Banks look at what is left over each month. If your unallocated cash flow is too low, they will reduce your loan amount regardless of your gross tier.
Credit Score Scaling: A clean payment history across all co-applicants is essential; a poor score from one partner can block a joint application.

The Out-of-Pocket Cash Trap

A higher combined income increases your maximum purchase ceiling, but it also raises your upfront **Estimated Cash Required**. These transfer duties, legal fees, and administrative registrations generally equal around 5% of the property value and cannot be wrapped into the home loan. Both partners must ensure this liquid cash is available immediately.

Settle Debts First

Clearing small credit card balances or retail accounts prior to applying directly improves your net disposable surplus, triggering higher loan approval margins.

Joint & Several Liability

Co-signing a home loan means both applicants are completely responsible for the full debt, not just half. Banks hold both parties legally liable for the total monthly value.

Leverage a Deposit

Putting down even a 5% to 10% deposit lowers your overall principal risk profile, helping you secure lower interest rates from competing credit providers.