You apply for a home loan, a vehicle finance deal, or even a credit card increase — and the bank says no. No explanation beyond “you did not meet our affordability criteria.” In most cases, the reason comes down to a single number: your debt-to-income ratio. South African banks use this ratio as the first filter in every credit application, and if yours is above 40%, you are almost certainly going to be declined. The good news is that your DTI is not a mystery — you can calculate it yourself in under five minutes, and there are concrete steps to bring it down.
What Is the Debt-to-Income Ratio?
Your debt-to-income ratio (DTI) is the percentage of your gross monthly income that goes toward paying debt. The formula is simple:
DTI = (Total Monthly Debt Payments ÷ Gross Monthly Income) × 100
Gross monthly income is your salary before tax, UIF, and pension deductions — the amount your employer pays you, not your take-home pay. If you are self-employed, banks typically use your average monthly income over the past 6 to 12 months, verified by bank statements or financial statements.
Total monthly debt payments includes every contractual repayment you make on credit agreements: home loan, vehicle finance, personal loans, credit cards (minimum payment or actual payment), store accounts, overdraft repayments, student loans, and any other credit facility. It does not include rent, groceries, utilities, insurance premiums, or other living expenses — those are assessed separately in the bank’s full affordability calculation.
How to Calculate Your DTI — Step by Step
Let us walk through a real example. Meet Thabo, a project manager in Johannesburg earning R25,000 gross per month.
List every debt payment
Thabo pulls out his latest bank statement and lists every monthly debt payment:
- Vehicle finance: R4,200/month
- Personal loan (Capitec): R2,800/month
- Credit card (FNB): R1,500/month minimum
- Woolworths store account: R800/month
- Edgars store account: R600/month
- Student loan: R1,100/month
- Overdraft repayment (Absa): R1,000/month
Add them up
R4,200 + R2,800 + R1,500 + R800 + R600 + R1,100 + R1,000 = R12,000 total monthly debt payments.
Divide by gross income and multiply by 100
(R12,000 ÷ R25,000) × 100 = 48% DTI
Thabo’s DTI is 48%. Nearly half of his gross salary goes to debt repayments before he pays for rent, food, transport, or utilities. Any bank will decline his application for new credit. Under the National Credit Act, Thabo may already qualify as over-indebted.
Want to see the numbers for your own situation? Use our free debt review calculator to run the calculation instantly.
What DTI Ranges Mean — And How Banks Respond
South African banks — FNB, Absa, Standard Bank, Nedbank, and Capitec — all use DTI as a core part of their affordability assessment under Section 81 of the National Credit Act. While each bank’s exact threshold differs slightly, the general framework is consistent:
| DTI Range | What It Means | Bank Response | Recommended Action |
|---|---|---|---|
| Under 20% | Excellent. Minimal debt burden. | Best interest rates, highest approval odds. | Maintain this level. Build savings and investments. |
| 20% - 30% | Healthy. Manageable debt load. | Approved at competitive rates for most products. | Good position. Avoid taking on unnecessary new debt. |
| 30% - 40% | Stretched. Limited room for error. | May be approved with conditions or at higher rates. Some products declined. | Stop taking on new credit. Focus on paying down existing debt. |
| 40% - 50% | Over-extended. Financial stress likely. | Most new credit applications declined. Flagged as high risk. | Urgently reduce debt. Consider professional debt counselling. |
| Over 50% | Over-indebted. Cannot sustain current payments. | All new credit declined. May face legal action from creditors. | Seek debt review immediately. Legal protection available under the NCA. |
Warning: A DTI above 40% does not just mean you will be declined for new credit. It means your current debt load is unsustainable. One unexpected expense — a car repair, a medical bill, a retrenchment — can push you into default. If your DTI is above 40%, do not wait for a crisis. Read more about the signs that it is time to consider debt review.
What Counts as “Debt” in the Calculation?
This is where many people make mistakes. Not everything you pay monthly is a debt. Here is what counts and what does not:
Included in DTI
- Home loan / bond repayment
- Vehicle finance instalment
- Personal loan repayment
- Credit card minimum payment
- Store account payments (Woolworths, Edgars, Mr Price, etc.)
- Overdraft repayments
- Student loan payments
- Micro-loan or payday loan repayments
- Any other credit agreement under the NCA
NOT Included in DTI
- Rent
- Groceries and food
- Electricity and water
- Transport and fuel
- Medical aid premiums
- Insurance premiums (car, home, life)
- School fees
- Cellphone airtime/data
- DSTV, Netflix, subscriptions
Note: while rent and living expenses are not part of the DTI formula, banks assess them separately. Under Section 81(2) of the National Credit Act, a credit provider must verify that you can afford the proposed repayments after accounting for all existing obligations and necessary living expenses. So even if your DTI is 25%, you can still be declined if your rent, food, and transport leave no room for a new instalment.
DTI vs Debt-to-Asset Ratio — What Is the Difference?
People often confuse these two ratios. They measure different things:
- Debt-to-income ratio (DTI): Monthly debt payments as a percentage of monthly gross income. This measures your cash flow pressure — can you actually afford your monthly payments?
- Debt-to-asset ratio: Total outstanding debt balances compared to the total value of everything you own (property, vehicles, investments, savings). This measures your net worth — do you own more than you owe?
You can have a low debt-to-asset ratio (because your house is worth more than your bond) but a dangerously high DTI (because your monthly repayments eat most of your salary). For everyday financial health and credit applications, DTI is the more important number because it tells you whether you can survive month to month.
How a High DTI Leads to Loan Rejection
Here is how it plays out in practice. Consider two applicants at the same bank, both applying for a R200,000 personal loan:
| Factor | Applicant A | Applicant B |
|---|---|---|
| Gross monthly income | R40,000 | R40,000 |
| Current monthly debt payments | R8,000 | R18,000 |
| Current DTI | 20% | 45% |
| New loan instalment (R200K over 60 months) | R4,600/month | R4,600/month |
| DTI after new loan | 31.5% | 56.5% |
| Bank decision | Approved | Declined |
Both earn the same salary. But Applicant B already has R18,000 in monthly debt payments. Adding the new loan would push their DTI to 56.5% — well beyond any bank’s threshold. The bank is not being unfair. At 56.5%, the numbers say Applicant B cannot afford the loan without defaulting. If this scenario sounds familiar, find out how much debt you need to qualify for debt review.
7 Ways to Lower Your Debt-to-Income Ratio
If your DTI is above 30%, here are practical steps to bring it down. These are listed in order of impact:
Pay off your highest-interest debt first
Credit cards (18-22%), personal loans (up to 27%), and store accounts (up to 24%) cost the most in interest and often have the smallest balances. Clearing a R15,000 Woolworths account frees up R800/month in your DTI calculation immediately.
Stop taking on new credit
Every new credit agreement adds to your monthly debt payments. Decline store card offers at the till. Do not apply for credit card limit increases. If you cannot pay cash, you cannot afford it right now.
Make extra payments on existing debt
Even R200-R500 extra per month on your highest-rate debt accelerates payoff dramatically. On a R50,000 personal loan at 24%, paying R500 extra per month saves you R18,000 in interest and clears the debt 14 months earlier.
Increase your income
The DTI formula has two sides. If you cannot reduce debt payments, increasing your gross income has the same effect. A R3,000/month side income drops a 48% DTI on R25,000 to 42.8% on R28,000. Not a fix by itself, but it helps.
Close unused credit facilities
That old overdraft or store account you never use still shows up on your credit profile. Banks sometimes factor available credit into their risk assessment. Close accounts you do not need to clean up your credit profile.
Avoid debt consolidation loans that extend your term
A consolidation loan can lower your monthly payment by stretching repayment over a longer period, but you often pay more total interest. It can also give a false sense of progress while your total debt remains the same or grows. Be cautious and read about the real differences between your options.
Get professional help if your DTI is above 40%
When your DTI is above 40% and climbing despite your best efforts, the math is working against you. Interest charges are adding more debt each month than you can pay off. This is exactly the situation that debt review was designed for.
When Your DTI Means You Need Debt Review
If your debt-to-income ratio is above 40% and you are experiencing any of the following, you are likely over-indebted as defined by Section 79 of the National Credit Act:
- Using one credit facility to pay another (robbing Peter to pay Paul)
- Missing payments or paying late regularly
- Only paying the minimum on credit cards every month
- Your salary is finished within a week of payday
- You have been declined for credit more than once
- Creditors are calling or sending letters of demand
Debt review is a legal process under the NCA that restructures your debt repayments to a level you can actually afford. A registered debt counsellor negotiates with your creditors to reduce interest rates — often from 18-27% down to 0-5% — and extends repayment terms. The restructured plan is made a court order, which means creditors cannot take legal action against you or repossess your assets while you are paying according to the plan.
Real example: Naledi, a teacher earning R28,000/month, had a DTI of 54% — R15,120 in monthly debt payments including a car loan (R5,200), personal loan (R3,800), two credit cards (R3,400 combined), and three store accounts (R2,720 combined). After entering debt review with a registered debt review company, her interest rates were negotiated down to 2-5% and her total monthly payment dropped to R8,600 — a DTI of 30.7%. She went from over-indebted to manageable in one step, with legal protection from creditors throughout the process.
Not sure if your DTI qualifies you for debt review? You do not need to guess. A free assessment with an NCR-registered debt counsellor takes 60 seconds and will tell you exactly where you stand. There is no obligation and no cost for the initial assessment.
How to Keep Your DTI Healthy Long Term
Whether you are already in a good position or working to recover, these habits keep your debt-to-income ratio under control:
- Follow the 30% rule: Never let total debt payments exceed 30% of your gross income. Before signing any new credit agreement, calculate what it will do to your DTI.
- Check your DTI quarterly: Your ratio changes as you pay down debt or take on new obligations. A quarterly check takes five minutes and gives you early warning if things are heading in the wrong direction.
- Build a buffer: An emergency fund of even R5,000-R10,000 prevents you from using credit when unexpected expenses hit. Credit used in emergencies is the fastest way to blow up your DTI.
- Say no to store cards at the till: That 10% discount is not worth a new credit facility. Every store account adds a monthly payment to your DTI — and store account interest rates are among the highest in the market at up to 24%.
- Review your credit report annually: Errors on your credit report can inflate your apparent debt load. Get a free report from TransUnion, Experian, or Compuscan and check that all listed accounts are actually yours and that balances are accurate.
Your debt-to-income ratio is not just a number that banks care about — it is the clearest indicator of your financial health. If yours is under 30%, you are in a strong position. If it is between 30% and 40%, take action now before it climbs higher. And if it is above 40%, do not ignore it. The longer you wait, the harder it becomes to recover without professional help. Reach out to Debt Solutions 4U for a free, no-obligation assessment today.
Reviewed by a registered debt counsellor, NCRDC2423
Frequently Asked Questions
What is a good debt-to-income ratio in South Africa?
A DTI below 30% is considered healthy by most South African banks. Between 30% and 40% is manageable but risky. Above 40% means you are over-extended and will struggle to get new credit approved. Above 50% is a strong indicator of over-indebtedness under the National Credit Act.
Does rent count in my debt-to-income ratio?
No. Rent is a living expense, not a debt obligation. Only contractual debt repayments count in the DTI calculation — home loan, vehicle finance, credit cards, personal loans, store accounts, and any other credit agreements. However, banks do include rent separately in their affordability assessment to calculate your disposable income.
How do South African banks use my DTI when I apply for a loan?
Banks are legally required under Section 81 of the National Credit Act to conduct an affordability assessment before granting credit. Your DTI ratio is a key input. If your DTI exceeds 40%, most banks will decline your application automatically. Even between 30% and 40%, you may only qualify for smaller loan amounts or face higher interest rates.
What is the difference between debt-to-income ratio and debt-to-asset ratio?
Debt-to-income ratio compares your monthly debt payments to your monthly gross income — it measures cash flow pressure. Debt-to-asset ratio compares your total outstanding debt balances to the total value of your assets (property, vehicles, investments). A high debt-to-asset ratio means you owe more than you own, while a high DTI means your monthly payments are eating too much of your salary.
Can debt review help lower my debt-to-income ratio?
Yes. Debt review restructures your repayment plan by negotiating reduced interest rates (often 0-5%) and extending repayment terms. This lowers your total monthly debt payments, which directly reduces your DTI ratio. For example, if your monthly debt payments drop from R15,000 to R9,000, your DTI on a R30,000 salary goes from 50% to 30%. While you cannot take on new credit during debt review, it gives you a clear path to financial recovery.
