Vacancy cost is the lost rent plus the extra carrying and turnover expenses a property owner absorbs while a unit sits empty. The baseline formula is simple: vacancy loss equals gross scheduled income multiplied by the vacancy rate, and that figure only becomes a true total once you layer in make-ready repairs, marketing spend, and the carrying costs that keep running whether or not someone is paying rent.
TL;DR:
- Track physical vacancy as vacant unit days divided by rentable unit days, and economic vacancy as scheduled income minus collections divided by scheduled income.
- A $2,000 unit vacant 20 days lost about $1,333 in rent; prorated carrying costs and $600 in turnover expenses brought the total to $2,333.
- Compare vacancy by asset class, submarket, and measurement window; URA’s end Q1 2026 national rate of 6.2% covers completed private homes only.
- A modestly priced unit can cost $4,000 to $6,000 per vacant month after lost rent, carrying costs, repairs, and marketing are counted.
- Price units to lease within 10 to 14 days, and compare concessions with rent cuts before choosing the cheaper way to fill a vacancy.
Table of Contents
- Vacancy Rate, Vacancy Loss, and the Physical vs Economic Split
- How to Measure Vacancy for a Single Unit or a Whole Portfolio
- Calculating Total Vacancy Cost With a Worked Example
- Benchmarks: Reading Official Vacancy Statistics Correctly
- How Vacancy Assumptions Shape Cash Flow and Valuation
- Tactics That Actually Shorten Vacancy and Cut Its Cost
- A Practical Vacancy-Cost Checklist
- Why Disciplined Vacancy Tracking Pays Off More Than It Looks
- How We Help You Measure and Reduce Vacancy Cost
- FAQ
- Sources
Vacancy Rate, Vacancy Loss, and the Physical vs Economic Split
Vacancy rate is a ratio, and the denominator you choose changes the answer. Measuring over a single day inflates the number for short gaps, while a monthly or annual window smooths out normal turnover, so pick a window and stay consistent across every property you compare.
Vacancy loss is the dollar translation of that rate: it tells you how much rent disappeared, not just how often units sat empty. You need both figures because a high vacancy rate on a cheap unit can cost less than a low rate on an expensive one.
The two measurements that matter most:
- Physical vacancy counts actual empty unit-days against total rentable unit-days, independent of money collected.
- Economic vacancy compares gross potential rent against rent actually collected, capturing losses from concessions, arrears, and waived fees that physical vacancy never sees.
Reporting vacancy as vacant days divided by available days, rather than a single end-of-month snapshot, keeps short turnovers from disappearing in your records, a measurement discipline the URA’s own vacancy framework recommends for consistency.
How to Measure Vacancy for a Single Unit or a Whole Portfolio
Calculating vacancy correctly starts with two formulas, not one.
- Physical vacancy = vacant unit-days ÷ rentable unit-days. A unit empty for 15 days in a 30-day month, in a building with one rentable unit, gives a 50% physical vacancy rate for that month.
- Economic vacancy = (gross scheduled income minus rent collected) ÷ gross scheduled income. If GSI is $2,000 and you collected $1,000 after a concession, economic vacancy is 50% as well, though the cause here is a discount, not an empty unit.
- Portfolio vacancy aggregates vacant unit-days across every unit and divides by total rentable unit-days for the same period, which lets you compare a ten-unit building against a single condo on equal footing.
To run these formulas monthly, track a short list of inputs for every unit: asking rent, rent actually collected, any concessions granted, number of vacant days, and make-ready days before a new tenant moves in. Recording these consistently is what the URA’s measurement guidance points to as the difference between a usable vacancy record and a guess.
Calculating Total Vacancy Cost With a Worked Example
Vacancy loss (GSI multiplied by vacancy rate) is only the starting point. Gross Scheduled Income is what a unit would earn if rented at market rate for the full period with no discounts, so it is the baseline every vacancy calculation works from.
Carrying costs keep accruing during a vacancy, and you should apportion the recurring monthly ones across calendar days rather than treat them as one-off charges:
- Mortgage interest and principal, divided into a daily rate.
- Property tax and insurance, prorated the same way.
- Utilities and management fees that continue during the vacancy.
Turnover and acquisition costs sit on top of carrying costs and are better summed per-turnover rather than per-day:
- Repairs and make-ready work before the next tenant moves in.
- Cleaning and minor touch-ups.
- Marketing and listing costs.
- Agent or leasing commission fees.
A worked example: a unit renting for $2,000 a month sits vacant for 20 days. Daily rent is roughly $67, so lost rent alone is about $1,333. Add a prorated share of mortgage, tax, and insurance for those 20 days, say $400, plus $600 in cleaning, minor repairs, and marketing, and the total vacancy cost for that single turnover lands near $2,333, well above the lost rent figure alone.
One month of vacancy on a modestly priced unit can realistically run $4,000 to $6,000 once lost rent, carrying costs, repairs, and marketing are all counted, which is why tracking vacancy loss in isolation understates the real financial hit.
Benchmarks: Reading Official Vacancy Statistics Correctly
Context matters more than the headline number. As of end-Q1 2026, the URA’s official vacancy data reported 26,158 vacant completed private residential units and a 6.2% vacancy rate, up from 25,570 units and 6.0% at the end of 2025. That figure covers completed private residential stock and is inferred from utility consumption, a methodology that changed in 4Q2016, so comparisons only hold when you match the same definition period.
A single national average also hides meaningful variation:
- The URA’s segment-level annex breaks vacancy down by Core Central Region, Rest of Central Region, and Outside Central Region, and these segments move differently over time.
- A citywide average of 6.2% can mask a submarket running well above or below that figure, so treating one universal number as “healthy” or “high” is misleading.
- The practical rule: benchmark your property against the same asset class, the same submarket, and the same measurement window, never against a blended national figure.
Reading current new-launch trends alongside these figures helps explain why vacancy in one segment can diverge sharply from another in the same quarter.
How Vacancy Assumptions Shape Cash Flow and Valuation
Applying a vacancy rate to gross scheduled income directly reduces net operating income, and since valuation models capitalize NOI, even a modest vacancy adjustment moves the number a buyer or lender will pay.
Underwriters face a choice between two very different inputs:
- A market vacancy assumption, drawn from comparable submarket data, which estimates what a typical investor should expect.
- Observed economic vacancy, which reflects actual leakage from concessions, arrears, and unpaid fees on the specific property being valued.
Treating vacancy as an income assumption applied to GSI, rather than as an afterthought buried in expenses, is the approach that makes its effect visible in both cash flow and valuation, a distinction the Wall Street Prep vacancy-loss framework lays out clearly.
One underwriting mistake worth avoiding: do not misattribute fixed costs to vacancy. Mortgage payments and insurance premiums are fixed whether or not a unit is occupied, while repairs and marketing are incremental costs tied specifically to the vacancy event. Lenders reviewing rent-roll underwriting pay close attention to this separation, since conflating the two inflates the apparent cost of vacancy and distorts the deal.
Tactics That Actually Shorten Vacancy and Cut Its Cost
Reducing vacancy cost comes down to pricing discipline, operational speed, and tenant retention.
- Run the break-even math before offering a concession. A one-month free rent incentive on a $2,000 lease costs $2,000 upfront, but if it fills a unit two weeks faster than a price cut would, it can still be the cheaper option.
- Standardize your make-ready process. A fixed repair budget and a pre-approved vendor list cut the days between move-out and move-in, which is where most avoidable vacancy cost accumulates.
- Screen for retention, not just approval. Tenants who renew avoid the full turnover cost stack entirely, so screening criteria that favor stability pay for themselves over a multi-year hold.
Pro Tip: Price a unit to lease within 10 to 14 days rather than holding out for a marginally higher rent; the carrying cost of extra vacant days usually outweighs the rent premium.
A Practical Vacancy-Cost Checklist
Running a monthly check on every unit catches problems before they compound into a full quarter of lost income.
- Record asking rent, collected rent, concessions, vacant days, and make-ready days for each unit every month.
- Flag any unit with vacant days exceeding your target turnover window for immediate pricing or marketing review.
- Compare physical and economic vacancy side by side to catch revenue leakage that an empty-unit count alone would miss.
- Review submarket vacancy data from sources like the URA’s statistics before adjusting rent expectations.
Why Disciplined Vacancy Tracking Pays Off More Than It Looks
Most owners treat vacancy as something that happens to them rather than something they measure. The owners who track physical and economic vacancy every month, not just at lease renewal, catch pricing mistakes and underperforming units months before a spreadsheet forces the issue. Try the worksheet above on one unit this month before applying it across a portfolio.
— Aman
How We Help You Measure and Reduce Vacancy Cost
Running vacancy math on paper is one thing, pricing and leasing a unit to avoid the vacancy in the first place is another. Our consultancy work spans property valuation and leasing strategy, so when a unit’s rent assumptions or submarket positioning seem off, we look at the underlying numbers with you rather than guessing at a fix. We also support portfolio reviews for owners juggling several units across residential, commercial, and industrial stock, where vacancy patterns rarely look the same from one asset class to the next. If a unit on your books has been sitting longer than it should, reach out through our consultancy services page and we will walk through the numbers with you.
FAQ
What’s the formula used to calculate vacancy rate?
Vacancy rate is typically calculated as vacant unit-days divided by total rentable unit-days for a chosen period, which gives you physical vacancy. A related figure, economic vacancy, divides the gap between gross scheduled income and rent actually collected by gross scheduled income, and both numbers are useful together, as explained by Wall Street Prep’s vacancy-loss formula.
How much is a vacancy?
A single month of vacancy on a modestly priced unit can cost between $4,000 and $6,000 once lost rent, carrying costs, repairs, and marketing are all included, though the exact figure depends on rent level, repair scope, and how quickly the unit relets. Lost rent alone understates the true cost, since carrying costs like mortgage interest and taxes keep accruing during the vacant period.
What counts as a healthy vacancy rate for a rental property?
There is no single universal benchmark, since vacancy varies by asset class, submarket, and measurement window. As of end-Q1 2026, URA’s official data reported a 6.2% vacancy rate across completed private residential units nationally, but segment-level figures within that same dataset vary meaningfully, so compare your property against the same asset class and submarket rather than a blended average.
How does property management quality affect vacancy cost?
Faster make-ready turnaround, consistent pricing reviews, and responsive leasing marketing all shorten the number of vacant days per turnover, which directly reduces both lost rent and prorated carrying costs. Portfolios with standardized repair budgets and pre-approved vendor lists tend to cut the days between move-out and move-in, which is where most avoidable vacancy cost accumulates.
What’s the difference between physical vacancy and economic vacancy?
Physical vacancy measures actual empty unit-days against total rentable unit-days, while economic vacancy measures the gap between gross potential rent and rent actually collected, capturing losses from concessions, arrears, and waived fees. A property can show low physical vacancy but still carry high economic vacancy if tenants are receiving discounts or falling behind on payments, a distinction the URA’s measurement guidance treats as essential for accurate reporting.
