Rental apartment occupancy: how long vacant before cash flow turns negative?

Basis: Avison Young — Ho Chi Minh City serviced apartments in Q2/2026 (Vietnam Law Newspaper, 14/07/2026) and the housing market in Q3/2026 (Vietnam+, 13/10/2026); DKRA Consulting and VARS-IRE on home-loan rates (Nha Dau Tu, 28/08/2026) · Updated 24/10/2026.

A year has 12 months of rent, so each vacant month loses 1/12 ≈ 8.3% of annual revenue. Two vacant months lose 16.7%, three lose 25%. When the unit is vacant the owner still pays management fees and loan interest, so the loss comes straight off net income. The question "how long vacant before it turns negative" therefore depends most on one thing: how much you borrow and at what rate.

Formula: maximum vacant months before cash flow turns negative

Vacant months you can bear = (12 months' rent − annual fixed costs − annual loan interest) ÷ one month's rent.

• Annual fixed costs: management fees paid by the owner, brokerage / rental service fees, repairs, insurance (if any).
• Annual loan interest: outstanding balance × the interest rate actually paid — use the rate after the promotion, not the first-year rate.
• A negative result means that even fully rented for 12 months, the rent still does not cover interest and fees.

How vacant the market is: reference figures

• Ho Chi Minh City serviced apartments in Q2/2026 (Avison Young): Grade A occupancy about 80%, Grade B about 75%; average rent about 40 USD/m²/month for Grade A and about 22 USD/m²/month for Grade B; Grade A and B supply of over 3,000 units. Roughly converted to a year, 80% occupancy equals about 2.4 vacant months and 75% about 3 months.
• Ho Chi Minh City housing rental yield in Q3/2026 (Avison Young): only about 2–3% a year, while home-loan rates are 12–15% a year.
• Home-loan rates (Nha Dau Tu, 28/08/2026): fixed rates for 12–24 months at 11 commonly used commercial banks are at 10.9% a year (DKRA Consulting, August 2026); after the promotion, the floating rate equals the base rate plus a margin of about 3.3–3.5 percentage points, or about 13–15% a year (VARS-IRE, survey of 10 banks in Q2/2026).

The occupancy rate of serviced apartments measures a whole building run by one operator, not a single privately rented apartment. Use it to know the general level, not as a substitute for the figures of the exact project you plan to buy.

Estimating vacancy time for a specific unit

There is no common figure for every unit. Whether vacancy is short or long depends on:

• Segment and rent: the higher the rent, the narrower the pool of tenants, and finding a tenant usually takes longer.
• Location and tenant group: near workplaces, schools, industrial zones, areas with many foreign professionals — ask who will rent this unit and where they work.
• Simultaneous supply: a project just handed over, with hundreds of units looking for tenants at once, puts pressure on both rent and vacancy time.
• Unit condition: a furnished, clean unit with good photos usually rents faster than an empty one.

How to check before buying: count the rental listings of the same project and the same unit type on the major listing sites and see how long they have been posted; ask the building management how many units are vacant; ask brokers renting in the project for the actual closing rent (not the asking rent).

Sensitivity table: 1, 2, 3 vacant months against loan rates

Assumptions (the same as the example in gross and net rental yield): a 4 billion VND apartment, rent 11 million VND/month; the owner pays management fees of 1 million VND/month (12 million VND/year); brokerage fee of 1 month's rent a year (11 million VND); repairs 8 million VND/year; revenue below the 1 billion VND/year threshold so no tax is counted. Interest is calculated on the full-year balance, not counting principal repayment.

Cash flow for the year after fees and interest (million VND):

Scenario	Full 12 months	1 month vacant	2 months vacant	3 months vacant	Maximum vacancy before negative
No loan	101	90	79	68	about 9 months
Loan of 700 million, rate 10.9% (interest 76 million/year)	about 25	about 14	about 3	about −8	about 2 months
Loan of 700 million, rate 13% (interest 91 million/year)	10	−1	−12	−23	less than 1 month
Loan of 1 billion, rate 10.9% (interest 109 million/year)	−8	−19	−30	−41	negative even when fully rented

Reading the table:

• With no loan, the unit only turns negative after about 9 vacant months — but net yield has already fallen from about 2.5% (full 12 months) to 1.7% with 3 vacant months.
• With a loan of only 700 million VND (about 17.5% of the unit price), there is room for about 2 vacant months at 10.9%; once the promotion ends and the rate rises to 13%, 1 vacant month is already negative.
• With a loan of 1 billion VND (25% of the unit price) at 10.9%, even a full year of rent does not cover the interest — you top up from your pocket every month.
• If you also repay principal (for example 700 million VND repaid evenly over 20 years is about 35 million VND of principal a year), the yearly top-up is even larger than the table shows.

Put the figures for the unit you are viewing into the rental income calculator; take the interest from the checklist table in safe bank-loan leverage.

Reducing vacancy time

• Price correctly from the start. For a unit rented at 11 million VND/month, a 5% cut (550 thousand VND/month) costs about 6.6 million VND a year, while one extra vacant month costs 11 million VND. Holding a high price and renting slowly usually loses more. How to compare similar units: pricing an apartment for rent.
• Prepare the unit before listing: cleaning, minor repairs, basic furniture, clear photos — see preparing a unit for quick sale or rental.
• Long-term contracts and early renewal: for contracts of 12 months or more, ask about the tenant's renewal intention 1–2 months before expiry so there is time to find a new tenant. Deposit and notice-on-leaving terms: clauses that protect the owner in a lease.
• A rental management agent: a single contact who shows the unit, signs the contract, tracks payments and finds replacement tenants — HPR's rental consignment service.

Setting cautious assumptions

• Count at least 1 vacant month a year as the base scenario, and also run a 2–3 month scenario (close to the 75–80% occupancy of serviced apartments above).
• A project about to be handed over, with many units looking for tenants: add a few vacant months for the first year.
• Use interest after the promotion (13–15% a year per the Q2/2026 survey), not the first-year rate.
• Take the rent from signed contracts in the same project and unit type — not asking prices or figures in advertising.
• Negative cash flow can still be your choice if you accept topping up money while waiting for prices to rise — but that is a bet on price, not a cash-flow investment, and no one can promise prices will rise.

Applied to HPR projects under advice

• The Marq (former District 1, built): the units are handed over and can be rented out immediately — the main questions are the time to find a tenant and the actual rent in the building.
• Legacy 66 (former District 5), Monrei Saigon and Setia Edenia (former Thuan An) are on sale: no rent until handover, so real vacant months start from receiving the home — see how to compare cash flow in primary or secondary purchase.

HPR has not published rent or vacancy figures specific to each project above; a specialist will send a worksheet for the specific unit with the assumptions stated clearly.

This article is for reference, the figures are illustrative examples, and it is not a promise of profit or financial advice for a specific case.

1. Take the rent from signed contracts in the same project and unit type — do not use asking prices.
2. Add the annual fixed costs: management fees paid by the owner, brokerage / rental service fees, repairs, insurance.
3. Calculate annual loan interest at the rate after the promotion (balance × rate); if you repay principal, add the principal part.
4. Vacant months you can bear = (rent × 12 − fixed costs − interest) ÷ one month's rent.
5. Compare the result with the cautious assumption of 2–3 vacant months a year; if it is smaller, reduce the loan or prepare money to top up.
6. Check the market: the number of rental listings in the same project, how long they have been posted, and the number of vacant units per the management.
7. Recalculate each time the bank changes the rate or when a lease is about to expire.

• Vietnam Law Newspaper (citing Avison Young) — Thị trường căn hộ dịch vụ TP.HCM giữ nhịp ổn định, nguồn cung hạng sang chờ bứt phá từ năm 2028 (Q2/2026: Grade A occupancy ~80%, Grade B ~75%), 14/07/2026.
• Vietnam+ (VNA, citing Avison Young) — Ho Chi Minh City's housing market sees price stabilisation, sharper buyer segmentation (Q3/2026: rental yield 2–3%, loan rates 12–15%), 13/10/2026.
• Nha Dau Tu — Lãi suất vay mua nhà bình quân đã vượt 10%/năm (DKRA Consulting August 2026: 10.9% a year; VARS-IRE Q2/2026: 13–15% a year after the promotion), 28/08/2026.