Economic Occupancy: Formula, Calculation and How It Differs From Physical Occupancy

Physical occupancy counts the doors that are closed. Economic occupancy counts the rent behind them.

The short version: a property can be 95% occupied and still earn only 90% of its potential rent, and almost everything in that gap is decided on-site.

Quick Answer Economic occupancy is the share of a property's potential rent that it actually earns. The formula is Economic Occupancy = Net Rental Income ÷ Market Rent × 100, where Market Rent is every unit at market rent and net rental income is what's left after loss to lease, vacancy, concessions, bad debt and non-revenue units. For example, a property with $2,160,000 of Market Rent and $1,947,600 of net rental income has an economic occupancy of 90.2%, even if it's 95% physically occupied.

What Is Economic Occupancy?

Economic occupancy measures how much rent a property actually earns compared with what it would earn if every unit were leased at market rent. It's expressed as a percentage.

Physical occupancy asks, "Is someone living there?" Economic occupancy asks, "Is the property getting paid full rent for it?"

That's why owners care about it more than the headline number. A unit leased with a month free, a resident who stopped paying, a renewal priced $50 under market and a model unit all look full on the occupancy report. None of them earns full rent.

Ninety-five percent occupied makes a great headline. It just isn't a deposit.

Economic occupancy comes straight from the revenue section of the operating statement: the top line (Market Rent) and the subtotal after every rental loss (net rental income).

Economic Occupancy vs Economic Vacancy

Economic vacancy is the flip side: the share of potential rent the property doesn't earn.

Economic Vacancy = 100% − Economic Occupancy

At 90.2% economic occupancy, economic vacancy is 9.8%. In dollars, it's Market Rent minus net rental income.

Don't confuse economic vacancy with the vacancy loss line on the statement. Vacancy loss is only the rent on empty units. Economic vacancy is vacancy loss plus every other rental loss.

The Economic Occupancy Formula

Here's the formula this article uses:

Economic Occupancy = Net Rental Income ÷ Market Rent × 100

Both numbers sit at the top of the operating statement. This is how you get from one to the other:

Market Rent
− Loss to lease
= Gross Potential Rent (GPR)
− Vacancy loss
− Concessions
− Bad debt
− Non-revenue units
= Net Rental Income

• Market Rent is what the property would earn if every unit were leased at today's market rent for the whole period, occupied or not.
• Loss to lease is the gap between market rent and the rent residents pay on their current leases.
• Gross potential rent (GPR) is Market Rent minus loss to lease: occupied units at their lease rents, vacant units at market.
• Vacancy loss is the market rent on empty units.
• Concessions are rent given away to sign or keep a lease.
• Bad debt is rent that's billed but never collected.
• Non-revenue units are model, employee and office units that earn no rent by design.

Many guides write the formula as "actual rent collected ÷ gross potential rent," with GPR meaning every unit at market rent. That's the same idea as Net Rental Income ÷ Market Rent. Just check which rent a report means by "GPR," because some statements use the market figure and some use lease rents.

Add other income, such as fees, parking and utility reimbursements, to net rental income and you get Total Income, which many textbooks call effective gross income (EGI). We walk through how Market Rent becomes Total Income line by line in a separate post. Most economic occupancy formulas leave other income out, because the point is to measure rent.

Why Definitions Vary

Economic occupancy has no single official formula. The versions you'll see differ on one question: which losses count?

• Market-rent basis. Net rental income ÷ Market Rent. Counts every loss, including loss to lease. This is the version this article uses.
• GPR basis. Net rental income ÷ GPR. Leaves loss to lease out, so it measures leasing and collections but not pricing.
• Vacancy-only. Counts empty units and nothing else. Some public apartment REITs report it this way. In AvalonBay's earnings releases, "Economic Occupancy is defined as total possible Residential revenue less vacancy loss as a percentage of total possible Residential revenue." That total possible revenue values occupied units at contract rates and vacant units at market rents.

Some operators also add other income to both sides of the ratio. None of these versions is wrong. They answer different questions, so the formula behind a report matters more than the label on it.

This article uses the market-rent basis because it captures every lever the site team controls: pricing, leasing, concessions, collections and how units are used.

How to Calculate Economic Occupancy: A Multifamily Example

Here's an illustrative 120-unit property with an average market rent of $1,500 a month. It's the same example property we use in our other revenue posts, and the numbers are round on purpose.

1. Calculate Market Rent. 120 units × $1,500 × 12 months = $2,160,000.
2. Subtract loss to lease. Lease rents average 2% below market, a $43,200 loss. That leaves GPR of $2,116,800.
3. Subtract vacancy loss. Six units sit empty on average (5% of 120): 6 × $1,500 × 12 = $108,000.
4. Subtract concessions, bad debt and non-revenue units. Concessions (1% of Market Rent) are $21,600, bad debt (1%) is $21,600 and one model unit is $18,000.
5. That's net rental income. $2,116,800 − $108,000 − $21,600 − $21,600 − $18,000 = $1,947,600.
6. Divide by Market Rent. $1,947,600 ÷ $2,160,000 = 90.2%.

Illustrative example. Not a benchmark for any market.

Economic occupancy is 90.2%. Economic vacancy is 9.8%, or $212,400 a year of rent the property could have earned at market and didn't.

Same Property, Three Answers

Run the same property through the other definitions and the number moves:

Same building, same year, same rent roll. The three economic occupancy figures span 4.7 points, depending only on the formula.

So before you compare your economic occupancy with another property, a regional report or a REIT disclosure, ask which version it is.

Physical vs Economic Occupancy

Physical occupancy is the share of units occupied on a given day:

Physical Occupancy = Occupied Units ÷ Total Units × 100

On the example property, 6 of 120 units are vacant, so physical occupancy is 95%. The model unit isn't vacant, so it counts on the occupied side.

National vacancy figures work the same way. The U.S. Census Bureau reported that "National vacancy rates in the second quarter 2026 were 7.3 percent for rental housing." That figure covers all rental housing, not just apartments, and it counts empty units, not lost rent.

Three numbers, three different questions:

The first two count units. Only economic occupancy counts dollars. We cover physical, average and economic occupancy side by side, including why days matter, in our financial fundamentals post.

On the example, the gap between physical (95%) and economic (90.2%) is about 4.8 points, or $104,400 a year:

• Loss to lease: $43,200
• Concessions: $21,600
• Bad debt: $21,600
• Model unit: $18,000

Vacancy isn't on that list, because physical occupancy already counts it. Everything else is rent lost on units that look full.

Two Properties at 95%

Here's why owners ask for the economic number. Take two properties with the same 120 units, the same $1,500 market rent and the same 95% physical occupancy.

Property A runs 1% concessions and 1% bad debt. Economic occupancy: 90.2%.

Property B fills units with move-in specials and is slow on collections: 3% concessions and 2% bad debt. Economic occupancy: 87.2%.

Both report "95% occupied." Property B earns $64,800 less rent a year ($1,882,800 vs $1,947,600).

Why Owners and Lenders Watch the Gap

If expenses stay the same, lost rent drops straight to net operating income (NOI). And NOI is what drives value.

At an illustrative 5% cap rate, Property B's $64,800 of missing rent is worth about $1,296,000 of property value ($64,800 ÷ 0.05).

Lenders look past the headline number too. Fannie Mae's multifamily guide, for example, lists economic vacancy among the base assumptions in its refinance risk analysis, using "the underwritten economic vacancy rate." Requirements vary by lender and loan program, so check the specific loan terms. For the bigger picture, see how lenders and cap rates value NOI.

What Moves Economic Occupancy On-Site

On the example property, one point of economic occupancy is worth $21,600 a year (1% of $2,160,000). Here's where the points come from:

• Vacant days. A vacant unit-day costs about $49.32 ($1,500 × 12 ÷ 365). Cut five days off each of 40 turns a year and you get back 200 unit-days: about $9,860, or roughly half a point. Make-ready speed and pre-leasing move this number.
• Loss to lease. Loss to lease is $43,200 here. Close half of it at renewal and economic occupancy rises a full point. Renewal pricing, and how early the renewal conversation starts, decides most of it.
• Concessions. One month free on a 12-month lease at $1,500 costs the same as cutting the rent $125 a month for a year. The net effective rent is $1,375. Track every concession by reason, so you know which ones bought occupancy and which ones only discounted it.
• Bad debt. A resident who moves out owing two months' rent leaves a $3,000 write-off, about 0.14 points. Screening, early follow-up and payment plans all show up here.
• Non-revenue units. The model unit costs $18,000 a year in rent it doesn't earn, about 0.83 points. Once a property is stabilized, it's fair to ask whether the model still earns its keep.

Rent increases, concessions and fees are regulated at the state and local level in many places, so check local rules before changing renewal pricing or concession policy.

Each of these is a decision someone on-site makes every week.

How Economic Occupancy Shows Up in the Budget

A budget that says "95% occupancy" hasn't said much about revenue yet. The revenue build has to answer the same questions economic occupancy does:

• Which leases expire each month, and how many will renew?
• At what renewal rent, compared with market?
• How many days does a turned unit sit empty?
• What concessions will lease-up or retention need, and where?
• What bad debt assumption does this property's history support?
• Which units are models, employee units or offices?

Answer those from the rent roll and economic occupancy comes out of the budget as a result. You don't type it in.

That's also how you answer the owner's question before it's asked: "You're budgeting 95% occupied, so why is rental income only 90% of market?" Every point of the gap has a line and a reason.

For the full process, see our guide to building a property management budget. In Vizibly, revenue is built from the rent roll and lease expirations pulled from your property management system, so these assumptions start from the actual leases instead of a retyped spreadsheet.

Common Economic Occupancy Mistakes

• Comparing numbers built on different formulas. A vacancy-only figure and a market-rent-basis figure can sit nearly five points apart on the same building.
• Budgeting revenue from physical occupancy. 95% occupied doesn't mean 95% of Market Rent. On the example property, it means 90.2%.
• Netting concessions into rent. Recording a lower rent instead of a concession hides what the concession cost and moves it into loss to lease, where it looks like a pricing problem.
• Forgetting non-revenue units. Model and employee units count as occupied, so physical occupancy never shows their cost. Economic occupancy does.
• Reading a month-end snapshot. Closing the month at 95% after sitting at 91% for three weeks doesn't earn 95% of the month's rent. Average and economic occupancy catch that. Physical occupancy doesn't.
• Treating a catch-up month as a trend. A month when old balances get collected can lift economic occupancy for one period. Look at the trailing three and twelve months before calling it an improvement.

FAQ

What is a good economic occupancy rate?

There's no universal benchmark, because properties and reports calculate it differently. Compare it with the same property's history, its budget and comps that use the same formula, and watch the gap to physical occupancy.

Can economic occupancy be higher than physical occupancy?

Yes, in some cases: if residents pay more than current market rent, or if the vacant units are the cheapest ones in a vacancy-only calculation, the economic figure can come out higher.

What does "economically occupied" mean?

It describes a unit that's producing its full rent, so a leased unit in a free month, or one whose resident isn't paying, is physically occupied but not economically occupied.

What is financial occupancy?

It's a name some REITs use for a similar measure, and Essex Property Trust explains it this way: "Financial occupancy is defined as the percentage resulting from dividing actual rental income by total scheduled rental income (actual rent for occupied apartment homes plus market rent for vacant apartment homes)."

Does economic occupancy include other income?

Usually not: most versions, including the one in this article, measure rent only, and other income is added afterward to reach Total Income. If a report includes fees or parking in the ratio, note that before you compare it.

Should economic occupancy be tracked monthly or annually?

Both: monthly tracking shows a problem early, and the trailing 12 months (T12) smooths out seasonal swings for owner reviews.

The Punchline

Physical occupancy tells you the units are full. Economic occupancy tells you whether they're paying.

Loss to lease. Vacancy. Concessions. Bad debt. Non-revenue units. Every point between the two numbers has a name, a dollar value and an owner on-site.

Want your team to calculate both with confidence? Financials 101 for Property Managers includes a lesson on physical vs economic occupancy, plus occupancy comparison, concession impact and bad debt impact calculators.

Sources

• AvalonBay Communities, Inc., Q2 2026 earnings release (Form 8-K, Exhibit 99.1), July 22, 2026. https://www.sec.gov/Archives/edgar/data/0000915912/000091591226000018/q22026ex-991.htm
• Essex Property Trust, Inc., "Third Quarter 2023 Earnings Release and Supplemental Data" (Form 8-K, Exhibit 99.1), October 26, 2023. https://www.sec.gov/Archives/edgar/data/920522/000114036123049708/ef20013027_ex99-1.htm
• U.S. Census Bureau, "Housing Vacancies and Homeownership (CPS/HVS), Second Quarter 2026," released July 28, 2026. https://www.census.gov/housing/hvs/current/index.html
• Fannie Mae, Multifamily Selling and Servicing Guide, Part II, Section 204.01 "Base Assumptions," effective September 28, 2026. https://mfguide.fanniemae.com/fnmf-pdf/download/7546