Net Effective Rent Calculator
Enter your lease term, gross monthly rent, and any landlord concessions to find the true average monthly cost of the lease. The calculator accounts for rent-free months, tenant cash allowances, operating costs, and broker fees, then shows both monthly and annual net effective rent. Switch to area mode to enter rent per square foot or square metre. You can also reverse-solve: enter the NER you want and find what gross rent it implies.
What is net effective rent?
Net effective rent (NER) is the average monthly cost of a lease after spreading all landlord concessions - rent-free periods, tenant improvement allowances, and other incentives - evenly across the entire lease term. It gives landlords, tenants, and investors a single apples-to-apples number to compare leases that may carry very different face rents but different concession packages. A lease with a $3,000 gross monthly rent and one free month on a 12-month term has an NER of ($3,000 x 11) / 12 = $2,750. The difference, $250/month, is the cost of the concession amortized across the term. NER is especially important in commercial real estate and high-cost residential markets like New York City, where landlords routinely advertise face rents that are meaningfully higher than what tenants effectively pay.
How the NER formula works
The standard net effective rent formula is: NER = [Gross Rent x (Lease Term - Free Months) - Tenant Allowance - Operating Costs x Lease Term - Broker Fee] / Lease Term. Every concession reduces the numerator (total net income), and dividing by the full lease term spreads that reduction across every month. This is why a tenant improvement allowance reduces NER even though it is paid upfront: it shrinks total landlord income over the lease. Operating costs work the same way - maintenance and security reduce the net income the landlord actually keeps each month. Broker fees are one-time costs that reduce net income in the month they are paid, but the formula spreads them across the entire term for a clean monthly comparison. The result is always lower than the face rent whenever any concessions or costs exist.
Using NER to compare competing lease offers
NER is most powerful when comparing two or more lease offers with different structures. Suppose Offer A has a $4,000/month face rent with two free months on a 24-month lease, while Offer B has a $3,800/month face rent with zero free months. Face rent says Offer B is cheaper. NER says: Offer A NER = ($4,000 x 22) / 24 = $3,667/month. Offer B NER = $3,800/month. After concessions, Offer A actually costs $133 less per month even though its face rent is higher. The same logic applies in reverse: landlords use NER to understand their true income after offering incentives, and portfolio managers use it to compare buildings or submarkets where concession practices differ. Whenever concessions differ, NER is the only fair basis for comparison.
Residential vs commercial NER
In residential real estate, NER typically involves only rent-free months and occasionally a broker fee concession. In commercial leasing, tenant improvement allowances are large and common because tenants often pay for build-outs and then receive a landlord cash contribution. Operating costs (sometimes called NNN or triple-net charges) further reduce net income and must be factored in. The NER concept is identical in both cases - total net income divided by lease term - but the inputs differ. This calculator handles both by letting you set operating costs and tenant allowances to zero for simple residential calculations. For gross leases (where the landlord covers operating costs), set operating costs to the monthly net expense. For net leases (where the tenant pays operating costs directly), set operating costs to zero.
Typical landlord concession levels by market condition
| Market condition | Free months (typical) | NER vs face rent | Notes |
|---|---|---|---|
| Hot / landlord-favored | 0-0.5 | 95-100% | Minimal concessions; high demand |
| Balanced market | 0.5-1.5 | 88-95% | Standard 1 free month on a 12-month lease |
| Soft / tenant-favored | 1.5-3 | 75-88% | Generous concessions to attract tenants |
| Distressed / recessionary | 3+ | Below 75% | Deep discounts plus allowances common |
These ranges are approximate industry benchmarks. Actual concessions vary by submarket, asset class, and negotiation.
Frequently asked questions
What is the difference between gross rent and net effective rent?
Gross rent (also called face rent) is the stated rent in the lease before any concessions. Net effective rent is the true average monthly cost after spreading all concessions - free months, tenant improvement allowances, operating costs, and broker fees - evenly across the lease term. Gross rent is what you advertise; NER is what you actually earn or pay. For a 12-month lease at $3,000/month with one free month, gross rent is $3,000 and NER is $2,750.
How do free months affect net effective rent?
Each free month reduces total rent collected by one gross rent payment. When you divide by the full lease term, that loss is spread evenly. On a 12-month lease at $2,000/month, one free month reduces NER by $2,000 / 12 = $166.67/month. Two free months reduce it by $333.33/month. The longer the lease term, the smaller the monthly impact of the same number of free months - which is why landlords often prefer longer leases when offering concessions.
What is a tenant improvement allowance (TIA) and how does it reduce NER?
A tenant improvement allowance is a one-time cash payment from the landlord to cover the cost of renovating, fitting out, or modifying the space for the tenant. Even though it is paid as a lump sum, the NER formula subtracts the full allowance from total lease income before dividing by the term. A $12,000 TIA on a 24-month lease at $2,500/month reduces NER by $12,000 / 24 = $500/month. The longer the lease, the smaller the monthly NER impact of the same allowance.
What does the reverse-solve mode do?
The reverse-solve mode lets you set a target NER and find what gross rent is required to achieve it, given your lease term and concessions. This is useful for landlords who want to advertise a competitive face rent while still hitting a specific net income target, or for tenants negotiating from a budget perspective. Enter the NER you need in the "target net effective rent" field, set your concessions, and the calculator returns the face rent that produces that NER.
Should broker fees be included in NER?
It depends on who pays the fee and what you are analyzing. When the landlord pays the broker and you are analyzing net landlord income, the fee reduces NER. When the tenant pays the broker, it may or may not affect NER depending on whether you want to model total tenant cost. This calculator lets you enter the fee as a multiple of gross rent (for example, 1 month or 15% expressed as 1.8 months) and includes it in the NER formula. Set broker fee months to zero if you want to exclude it.
How is NER used in commercial real estate portfolios?
Portfolio managers use NER to aggregate and compare properties with different concession structures. For a 200-unit building where all units share a $3,333 NER and 80% occupancy, annual portfolio NER = $3,333 x 160 units x 12 months = $6,399,360. This figure is directly comparable to another building with a different gross rent and concession package. Banks, appraisers, and investors often require NER (not face rent) for underwriting because it reflects actual income more accurately.
What is a typical NER discount from face rent?
In a balanced market with one free month on a standard 12-month lease, NER is about 8% below face rent. During a soft or recessionary market, landlords may offer 2-3 free months plus allowances, pushing NER 15-25% below face rent. In a hot market with near-zero concessions, NER and face rent are nearly identical. The reference table on this page summarizes typical ranges by market condition.