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. Mortgage pre-approval, step by step
A mortgage approval-in-principle (pre-approval) is a bank's assessment of your borrowing capacity before you have a specific flat. It produces an in-principle loan amount and rate. It is not a formal approval and is not tied to a valuation, but it tells you your real ceiling.
What the bank checks: income proof (three months of salary records and tax demand notes; self-employed applicants generally need two years of tax returns or an accountant's report), a TransUnion credit report, existing loans and card balances, the debt servicing ratio (DSR), and the DSR under the +2% stressed rate.
Validity is usually three to six months depending on the bank. It can be used across several flats, but formal approval still depends on the valuation of the specific property.
Why pre-approval affects price: a buyer holding one reads as a buyer who can complete. Where two offers are close, sellers and agents usually favour the side that is not still waiting on a mortgage decision — and that certainty is often worth a concession on price.
It also fixes your ceiling before you offer, which is what keeps you inside budget during the 72 hours before the provisional agreement. Buyers marginal on the stress test especially should pre-approve first: negotiating the price down reduces both the loan amount and the DSR.
7. FAQ
What is the difference between pre-approval and formal approval?+
Pre-approval assesses your borrowing capacity before you have a specific flat and gives an in-principle amount and rate, usually valid three to six months. Formal approval is property-specific and requires a valuation; a short valuation can reduce the amount below the pre-approved figure.
Does pre-approval affect my credit score?+
Each bank's credit-report enquiry is recorded, and a burst of enquiries across many banks can affect the score. In practice, keep it to two or three banks and apply within the same short window.
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.