Calculate true monthly rent after free months and concessions. Compare apartments with different incentive packages and see which deal saves you more over the full lease.
Net effective rent (NER) is the true average monthly cost of a lease after spreading all concessions — free months, moving credits, broker fee waivers — evenly across the lease term. A $3,000/month apartment with 2 free months on a 14-month lease has a net effective rent of ($3,000 × 12) ÷ 14 = $2,571/month, a 14.3% discount from the advertised price.
Landlords in competitive markets frequently offer concessions instead of lowering the listed rent, because it preserves the building's rent comparables (comps) and makes future rent increases less dramatic. New York City luxury buildings routinely offer 1-4 free months on 12-16 month leases, creating net effective discounts of 7-28%.
But be careful: when your lease renews, the renewal price is based on the gross rent (not the net effective), so next year's rent of $3,000 feels like a massive increase from the $2,571 you were effectively paying. This calculator helps you compare apartments with different concession packages, see the true cost difference, and understand what you'll pay at renewal.
In competitive rental markets, landlords offer free months and concessions that make comparison shopping confusing. Net effective rent gives you the only number that matters: what you actually pay per month on average. Keep these notes focused on your operational context. Tie the context to the calculator’s intended domain. Use this clarification to avoid ambiguous interpretation.
Net Effective Rent = (Gross Rent × Paid Months − Other Concessions) ÷ Total Term Paid Months = Lease Term − Free Months Total Concession Value = (Gross Rent × Free Months) + Other Concessions Effective Discount = (Gross − Net Effective) ÷ Gross × 100
Result: Net Effective Rent: $2,292/mo — 8.3% discount — Save $2,500 total
Gross total = $2,500 × 12 = $30,000. Free month value = $2,500. Effective total = $27,500. NER = $27,500 ÷ 12 = $2,292. Monthly savings = $208. Next year gross rent stays $2,500 though.
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Net effective rent is the true average monthly cost of a lease after spreading all concessions across the full term. If gross rent is $3,000 with 1 free month on 12 months: NER = ($3,000 × 11) ÷ 12 = $2,750. It's the only way to compare apartments with different incentive packages.
Usually yes, because: (1) Renewal is based on gross rent, so free months don't carry forward. (2) Lower gross means lower renewal increases. (3) Lower gross reduces broker fees (usually 1 month or 15% of annual rent). However, some landlords won't lower gross rent but will give free months — in that case, free months are better than nothing.
Varies by market condition. In soft NYC markets: 1-4 free months on new leases. In most US cities: 0-1 free months. New luxury developments use concessions most aggressively. In tight markets (2-3% vacancy), concessions disappear entirely.
Yes. If your net effective was $2,500 but gross was $3,000, your renewal will be based on $3,000 (often with a 2-5% increase). So you might pay $3,000-3,150 in year 2 — feeling like a $500-650 increase from what you were effectively paying. Factor this into your comparison.
A shorter lease with more free months (per month) might have better NER, but you risk: higher renewal rates, moving costs sooner, and broker fees again. Usually a longer lease with proportional concessions provides more stability. The term comparison table shows the exact economics.
Broker fees are typically based on the gross annual rent (commonly 1 month or 15% of annual). Concessions don't reduce the fee. Some landlords waive the broker fee as part of the concession package — this should be included in your NER calculation.