Bank-loan leverage: a safe borrowing level on a floating rate

Legal basis: Circular 41/2016/TT-NHNN, amended by Circular 22/2023/TT-NHNN dated 29/12/2023 (effective 01/7/2024) — risk weights for home mortgage loans by LTV ratio and income ratio (35% threshold); interest rates from the VARS-IRE survey for Q2 2026, DKRA for August 2026 and Avison Young for Q3 2026 · Updated 20/10/2026.

Borrowing lets you buy a bigger unit than your own capital allows, but on a floating rate the monthly repayment rises by about 30% if the rate goes from 11% to 15% a year after the promotional period. A safe loan amount is not the amount the bank approves; it is the amount you can still repay when rates rise, when the unit has no tenant and when your income drops for a while.

Current home loan rates (to October 2026)

• VARS-IRE survey of 10 banks for Q2 2026: promotional rates are commonly 8.5–11% a year, usually for only 6–12 months; after that the rate is the base rate plus a margin of about 3.3–3.5%, equivalent to 13–15% a year.
• DKRA Consulting, August 2026: fixed rates for 12–24 months at 11 commercial banks commonly at 10.9% a year.
• Avison Young's Q3 2026 report (reported 13 October 2026): home loan rates of 12–15% a year.
• Some contracts allow the rate to be adjusted even during the "fixed" period if deposit rates rise past a threshold — read this clause carefully.

Each bank's rates vary with the borrower's profile and the timing; see more detailed figures in the article home loan rates above 10% a year (in Vietnamese).

Three indicators that keep leverage in a safe zone

1. Debt-to-income ratio (DTI). Total debt repayments (principal + interest, all loans) divided by stable monthly income. The State Bank of Vietnam uses a 35% threshold for this ratio when assigning risk weights to home mortgage loans — loans above 35% are treated as riskier. It is not a lending cap, but it is a good reference point. A Batdongsan.com.vn survey (reported by Thoi bao Tai chinh on 27 July 2026) found buyers want principal and interest repayments at about 20–40% of income.

2. Interest-rate stress test. Work out the repayment at the current rate, then add 2 and 4 percentage points. A cautious guideline: if DTI exceeds about 40–45% at +4 points, the loan is too much.

3. Reserve fund. Keep separate cash equal to at least 6 months of repayments at the rate plus 4 points, plus the costs of months when the unit is vacant. This is a cautious suggestion, not a regulation.

For a unit bought to rent out, do not count the rent as income for repayments until there is an actual lease. Rental yields in Ho Chi Minh City are about 2–3% a year (Avison Young, Q3 2026), far below loan rates, so the rent usually covers only part of the repayment.

Repayment table: a 2 billion VND loan over 25 years

Indicative example, assuming equal monthly principal-and-interest payments and the rate held fixed for the whole term at each level (in practice it floats); insurance and early repayment fees not included.

Rate scenario	Monthly repayment	Income needed for DTI ≤ 35%	Income needed for DTI ≤ 40%	Shortfall after 11 million VND rent
Current: 11% a year	about 19.6 million	about 56 million	about 49 million	about 8.6 million
+2 points: 13% a year	about 22.6 million	about 64 million	about 56 million	about 11.6 million
+4 points: 15% a year	about 25.6 million	about 73 million	about 64 million	about 14.6 million

For the same loan, going from 11% to 15% a year raises the repayment by about 6 million VND/month (31%). Total interest over 25 years is about 3.9 billion VND at 11% and about 5.7 billion VND at 15%. A 6-month reserve fund at 15% a year: about 154 million VND.

The other way round: how much can an income of 50 million VND/month borrow?

If you want repayments of no more than 35% of income (17.5 million VND/month), over 25 years:

Assumed rate	Maximum loan (indicative example)
11% a year	about 1.79 billion VND
13% a year	about 1.55 billion VND
15% a year	about 1.37 billion VND

Choose your loan amount by the 13–15% rows, not by the first-year promotional rate.

Reducing risk once you have borrowed

• Ask for written answers: what the base rate is, the margin, the adjustment period, and the early repayment fee for each year.
• Prefer packages with a longer fixed period, even if the rate is slightly higher.
• A developer's interest-rate support usually ends at a specific milestone — prepare the repayment source for after that point.
• When you have spare cash, pay down principal to reduce later repayments.

This article is for reference only and does not replace legal or financial advice for your specific case.

1. Add up your stable, documented monthly income (salary, regular income) — without the expected rent.
2. Add up all existing debt repayments: other home loans, consumer loans, credit cards.
3. Ask the bank in writing for the promotional rate, the promotional period, and the base rate and margin afterwards.
4. Work out the repayment at 3 levels: the current rate, +2 points, +4 points.
5. Check the debt-to-income ratio at +4 points: it should be below about 40%.
6. Set aside a reserve fund of at least 6 months of repayments at the highest rate, plus the costs of months without a tenant.
7. Read the clause on rate adjustments during the fixed period and the early repayment fees.
8. Draw up a monthly cash-flow table, including the dates when interest-rate support ends and principal repayments begin.

Sources mostly in Vietnamese; titles kept in the original, with a short English translation in brackets.

• Nha Dau Tu — Lãi suất vay mua nhà bình quân đã vượt 10%/năm (Average home loan rates now above 10% a year — DKRA August 2026, VARS-IRE Q2 2026), 28 August 2026.
• Thoi bao Tai chinh Viet Nam — Lãi suất vay mua nhà "neo" hai con số, kỳ vọng hạ nhiệt không dễ (Home loan rates stuck at double digits, cooling not easy — rate adjustment clauses, Batdongsan.com.vn survey on repayments of 20–40% of income), 27 July 2026.
• Vietnam+ (VNA, citing Avison Young) — Ho Chi Minh City's housing market sees price stabilisation, sharper buyer segmentation, 13 October 2026.
• Vietnam Lawyers Journal — Ngân hàng Nhà nước điều chỉnh giảm hệ số rủi ro một số khoản vay bất động sản từ ngày 01/7/2024 (State Bank lowers risk weights for some real estate loans from 1 July 2024 — Circular 22/2023/TT-NHNN), accessed 20 October 2026.
• Banking Review — Một số sửa đổi, bổ sung quy định về tỉ lệ an toàn vốn đối với ngân hàng, chi nhánh ngân hàng nước ngoài (Amendments to capital adequacy rules for banks and foreign bank branches — Circular 22/2023/TT-NHNN dated 29 December 2023), accessed 20 October 2026.