Net effective rent is the average rent after concessions; your monthly payments depend on when the discount applies. A hypothetical apartment advertised at $2,200 net effective could require $2,400 in each of eleven months, with one month free.

The lease and concession rider—the document setting out the discount—should show what is due and when. Check both the cash needed at move-in and the bills that follow.

Gross rent vs. net effective rent

Gross rent is the base rent before the concession. For a fixed monthly rent, the calculation is:

Net effective monthly rent = (gross monthly rent × lease months − total rent concession) ÷ lease months

For a hypothetical twelve-month lease at $2,400 with a $2,400 concession:

($2,400 × 12 − $2,400) ÷ 12 = $2,200

That is a rent-only average. Comparing rent and concession economics also requires knowing when credits apply, which fees remain payable and what happens if you leave early.

Same net effective rent, different monthly payments

Compare two hypothetical offers. Both cover twelve full months at a fixed $2,400 gross rent, and both give $2,400 in concessions. Assume the tenant completes the lease and satisfies all concession conditions. Fees and deposits are excluded here.

Offer A preserves more cash at move-in. It requires $2,200 less than Offer B in month one, then $200 more in each remaining month. It can suit someone who needs cash for moving and can comfortably cover the later bills.

Offer B gives a steadier bill. The monthly credit makes the rent due match the advertised average. It can suit someone whose budget works best with equal payments.

A tenant could budget evenly under Offer A by setting aside $2,200 during the free month, then withdrawing $200 in each of the next eleven months to supplement a $2,200 monthly rent budget. That works only if the reserve remains available; the amount due would still be $2,400 in each paid month.

Before setting up payments, get the concession schedule with dates and amounts. A free month applied in month two or twelve does not provide the same move-in relief as the first-month credit modeled here.

Add fees and track deposits separately

The rent schedule is only part of the comparison. In its December 8, 2025 guidance for rental businesses, the FTC advised including mandatory fees in advertised rental prices.

When comparing rental offers, request a written fee schedule identifying amounts, due dates and whether each charge is required or optional. Use it to build both a full-term cost comparison and a calendar of payments. Include:

• Recurring charges: required amenity, trash, technology or service packages, plus parking, pet rent and other options you will actually use.
• One-time costs: application, administration, move-in and any applicable broker fees. Count each once and show when it is due.
• Separate household expenses: utilities and required insurance, using clearly labeled estimates where amounts vary.
• Refundable deposits: show these as cash needed upfront, separately from expected costs. Do not assume the deposit will be fully returned.

Including a fee in the comparison does not establish whether it is lawful in your location.

Extend the hypothetical with $75 in mandatory monthly fees and a $300 nonrefundable charge due at move-in under either offer. Assume the monthly fees also apply during the free month. Total rent and these fees become $27,600, averaging $2,300 a month, before utilities and insurance.

Now suppose each offer also requires a $1,200 refundable deposit. If the deposit, one-time charge and first monthly bill are all due at move-in, the cash needed is $1,575 under Offer A versus $3,775 under Offer B. Later monthly rent-and-fee bills are $2,475 under Offer A and $2,275 under Offer B. The deposit changes the initial cash requirement, not the rent average.

Read the rider for conditions and repayment

The totals above assume the tenant keeps the full concession. Read the rider for conditions tied to completing the lease and paying on time.

A historical Illinois lease form filed with the SEC in May 2015 illustrates the risk. Its concession addendum calls for repayment of concessions already received if the resident leaves before the lease expires. It also calls for repayment of that month's concession after a specified late-payment deadline. This illustrates contract wording; it is not a current form or a finding that those clauses are enforceable.

Before choosing, get written answers to four questions:

1. Eligibility: Which unit, lease length, signing deadline and move-in date qualify?
2. Timing: Which exact payments receive credits, and is any prorated rent due first?
3. Repayment: What triggers a clawback—a requirement to repay the concession? Does it cover credits already received, the whole promised concession or a prorated amount? Is a termination charge additional?
4. Renewal: When does the concession end, and what rent does management propose using for renewal, subject to applicable law?

If you might leave early, ask what you would owe under each offer. Equal advertised savings do not establish equal exit costs.

Renewal arithmetic is separate from renewal law

Suppose the next lease lawfully charges $2,400 a month with no concession. Relative to the first year's $2,200 average, average rent rises $200 a month, or about 9.1%, even though gross rent has not changed.

Under Offer A, the rent bill stays at the $2,400 already due in month twelve. Under Offer B, it rises from $2,200 to $2,400. Both tenants lose the same annual discount, but only the tenant with monthly credits sees an immediate increase from the previous month's rent payment.

Rent-regulated apartments need a separate review

The advertised average does not determine lawful renewal rent. In New York's rent-stabilized system, preferential rent is rent charged below the legal regulated rent. DHCR's May 2024 Fact Sheet #40 says rent-stabilized tenants paying preferential rent on or after June 14, 2019 generally retain that basis during their tenancy, with lawful increases applied to it. Certain government-regulated or financed affordable housing programs have exceptions.

A discount labeled a concession can receive preferential-rent protection. In Choi v. Linc LIC, decided May 12, 2026, New York's Appellate Division held that the concessions at issue functioned as preferential rent for calculating increases. That rent-stabilized case does not establish the treatment of every concession; the agreement, circumstances and applicable law matter.

For a disputed repayment clause or regulated renewal, consult a local tenant attorney.

For multifamily leasing teams, distinguishing scheduled rent from cash received also matters when reconciling rent rolls with collections. Give renters the gross rent, concession total, dated credits, recurring fees and move-in total together, so they can reconcile the advertisement, signed rider and first bill without reconstructing the math.