Loss to lease is the difference between the market rent a unit could command and the actual contract rent currently being paid. Measured per unit or across a whole property, it captures rent left on the table when in-place leases sit below market. Investors read it as embedded upside recoverable as leases renew.
How Is Loss to Lease Calculated?
Loss to lease is calculated by subtracting actual in-place rent from market rent, then multiplying by the number of affected units. The per-unit formula is Loss to Lease = Market Rent - Actual Rent. For a property, Loss to Lease = (Market Rent - In-Place Rent) x Units. It can also be expressed as a percentage of market rent.
Per PropertyMetrics, if a unit's market rent is $1,000 per month and the actual rent is $900, the loss to lease is $100 per month. The percentage form is (Market Rent - Actual Rent) / Market Rent, so a $2,500 market unit renting at $2,000 carries a 20% loss to lease. The percentage is the more useful comparison across properties because it normalizes for unit size and price point.
Input | Definition |
Market rent | The rent a unit would achieve if leased today at prevailing rates |
Actual rent | The contract rent the sitting tenant currently pays |
Loss to lease | Market rent minus actual rent, per unit or summed across units |
Loss to lease percent | (Market rent minus actual rent) divided by market rent |
The mirror image is gain to lease, which occurs when in-place rent sits above current market. Gain to lease is common after rents soften, and it signals downside risk on renewal rather than upside, because those above-market leases are likely to reset lower.
Why Loss to Lease Matters
Loss to lease matters because it is the clearest measure of unrealized rent upside in a property, and multifamily assets are valued on income. Every dollar recovered at renewal flows to net operating income, and at a market cap rate that added income capitalizes into value. A large loss to lease is a business plan.
The operator-side risk is trusting a market-rent number that is not real. Loss to lease is only as honest as the market rent assumption behind it. An underwriter who marks market rent aggressively can manufacture upside that will never materialize, inflating projected NOI and the exit price. Underwriters treat the market rent figure as the assumption to defend, not the loss to lease itself.
Example
A 120-unit property has market rent of $1,200 per unit and average in-place rent of $1,050. The per-unit loss to lease is $150. Across all 120 units that is $18,000 per month, or $216,000 per year at full occupancy, before any vacancy or turnover adjustment.
Component | Amount |
Market rent per unit (monthly) | $1,200 |
In-place rent per unit (monthly) | $1,050 |
Loss to lease per unit (monthly) | $150 |
Units | 120 |
Total loss to lease (monthly) | $18,000 |
Total loss to lease (annual) | $216,000 |
That $216,000 is the theoretical ceiling on recoverable rent, not a guarantee. Leases roll over a full cycle, not all at once, so only the portion renewing in a given year can be repriced. If leases turn evenly and half renew annually, roughly $108,000 becomes capturable in year one, with the rest following as the remaining leases expire.
Variations and Edge Cases
Loss to lease behaves differently depending on the rent environment and how the market rent figure is set, so the same headline gap can mean upside in a rising market and risk in a falling one. The table below covers the variants an underwriter should confirm before crediting any upside to a pro forma.
Variant | Treatment |
Gain to lease | In-place rent above market; a renewal risk, not upside |
Aggressive market rent | Overstated market rent inflates loss to lease and projected NOI |
Concessions | Free-rent or discount offers widen effective loss to lease beyond the face gap |
Lease roll timing | Only leases renewing in the period can be repriced; the rest stay locked |
Rising vs falling market | Loss to lease grows in a rising market and can flip to gain to lease in a falling one |
The most common mistake is reading total loss to lease as immediately recoverable income. It is a stock, not a flow: it can only be harvested as leases expire and renew, and only if the market rent assumption holds when they do.
Loss to Lease vs Vacancy Loss
Loss to lease is often confused with vacancy loss, and they describe different leaks in gross income. Loss to lease is rent forgone on occupied units because in-place leases sit below market. Vacancy loss is rent forgone because a unit is empty and producing no rent at all. One is an underpricing gap; the other is an occupancy gap.
Both reduce effective gross income, but they carry opposite fixes. Loss to lease closes as sitting tenants renew at higher rents, requiring no re-leasing. Vacancy loss closes only by filling an empty unit, which takes marketing, turnover cost, and downtime. An underwriter models them as separate line items on the road from gross potential rent to effective gross income.
Frequently Asked Questions
How do you calculate loss to lease?Loss to lease is market rent minus actual in-place rent. Per unit, subtract the contract rent from the market rent. For a property, multiply that gap by the number of units. As a percentage, divide the gap by market rent, so a $2,500 market unit renting at $2,000 shows a 20% loss to lease.
Is loss to lease good or bad for an investor?Loss to lease represents recoverable upside, so a large gap can be attractive if the market rent assumption is realistic and leases can be repriced at renewal. It becomes a problem only when market rent is overstated, because the projected upside then never materializes.
What is the difference between loss to lease and gain to lease?Loss to lease means in-place rent sits below market, signaling upside on renewal. Gain to lease means in-place rent sits above market, signaling downside risk because those leases are likely to reset lower when they expire.
Related Terms
Rent Roll
Net Operating Income
Pro Forma
Rent Escalation Clause
Cap Rate