1. What is the stress test
The stress test is an HKMA-mandated scenario check applied to every mortgage application: assume the current mortgage rate rises by 2 percentage points (200 bps) — does your monthly payment remain affordable?
There are two hurdles: DSR under current rates and DSR under the +2% scenario. Failing either compresses your loan-to-value or triggers outright rejection.
2. DSR standard & calculation
DSR (Debt Servicing Ratio) = monthly mortgage payment ÷ monthly stable income.
HKMA limits: Current rate DSR ≤ 50% (40% if you hold other mortgages); Stress-test DSR ≤ 60% (50% if you hold other mortgages).
3. Example: HK$60,000 monthly income, first-time buyer
30-year tenor, current mortgage rate 4.125% (H+1.3, H assumed 2.8%):
| Price | Loan (70%) | Payment @4.125% | Stress @6.125% | DSR now | Stress DSR | Result |
|---|---|---|---|---|---|---|
| HK$8M | HK$5.6M | HK$27,143 | HK$34,036 | 45.2% | 56.7% | ✅ Pass |
| HK$10M | HK$7.0M | HK$33,929 | HK$42,545 | 56.5% | 70.9% | ❌ Both fail |
| HK$9M | HK$6.3M | HK$30,536 | HK$38,291 | 50.9% | 63.8% | ❌ Both marginal |
| HK$8.5M | HK$5.95M | HK$28,840 | HK$36,163 | 48.1% | 60.3% | ⚠️ Edge |
4. How to improve your chances
1. Extend tenor to 30 years — directly reduces monthly payment.
2. Increase down-payment — smaller loan, smaller payment.
3. Add a guarantor — pool a parent's or spouse's income.
4. Clear other debts — personal loans, credit cards, car loans all eat DSR headroom.
5. Use stable base salary — bonuses and commissions are typically discounted.
6. Negotiate the price — every HK$100,000 off reduces the loan by HK$70,000 and monthly payment by ~HK$339.
5. How negotiation lowers the DSR bar
Using the same HK$60,000 income buying HK$9M: currently just over the DSR ceiling. Negotiating HK$500,000 off to HK$8.5M drops the loan to HK$5.95M, payment from HK$30,536 to HK$28,840 and stress DSR from 63.8% to 60.3% — just inside the ceiling.
Negotiation isn't only about saving on price — it's often the swing factor between a 70% mortgage and a compressed one.
6. FAQ
If I fail the stress test, is buying off the table?+
No. Mortgage Insurance can lift LTV to 90% (with insurer's own stress test). Alternatives: lower price, larger down-payment, add a guarantor.
How does the stress test work for the self-employed?+
Usually requires 2 years of tax returns or auditor's report; banks may apply a discount to averaged income. The DSR standard is the same.
What rates does the stress test use?+
Banks currently apply H+1.3 capped at P-1.75, roughly 4.125%. Stress test adds 2 pp → about 6.125%. These move with market rates.