Glossary · Income and the rent roll

Concessions and free rent

Also called Concessions, Free rent, Rent abatement.

A concession is rent given away to sign or renew a lease, most often as free months at the start of the term. It is a deduction on the way from gross potential rent to effective gross income, and it is what separates the asking rent on a rent roll from the rent a tenant actually pays.

Updated August 6, 2026 · All terms

How it works

Concessions matter more than their dollar size because they are invisible in the number everybody quotes. A unit advertised at $2,090 with one month free on a twelve-month lease collects $22,990 over the year, which is $1,916 a month. The rent roll shows $2,090, the market survey shows $2,090, and the $174 a month difference appears only in the collections line of the operating statement.

Two ways of stating rent are both in use and they are not interchangeable. Net effective rent spreads the abatement across the term and reports what the tenant will average. Face rent is the contract rate with the free months disclosed separately. Commercial leases almost always quote face rent, because the face rate sets the escalations and the recovery base and is what a future buyer capitalizes, so the abatement has to be modeled as its own cash flow rather than folded into the rate.

For underwriting the question is whether the concession is a lease-up cost that burns off or a standing feature of the submarket. A property finishing its lease-up should stop paying for occupancy it already has. A submarket absorbing three more years of deliveries will keep paying, and in that case the concession is not a discount off market rent, it is market rent.

Formula

Net effective rent = face rent x (months paid / total months in the term)
  • Months paid is the term less the abated months
  • One month free on a twelve-month lease is an 8.3 percent discount; two months is 16.7 percent
  • Concessions given to renew are as real as concessions given to sign, and are more often left out of a model

Worked example

The asking rent, and the rent

220 units, asking rent $2,090 a month. A lease-up offer of one month free on a twelve-month lease, taken by 66 units during the year.

Asking rent, annualized per unit2,090 x 12$25,080
One month abated($2,090)
Rent collected per unit over the term$22,990
Net effective rent per month$1,915.83
Concessions across the 66 units that took one($137,940)
Net effective rent as a share of asking91.7%

The rent roll reports $2,090 on every one of those units. If the concession is a standing feature of the submarket rather than a lease-up cost, the $137,940 is a recurring deduction, and at a 5.40 percent cap rate it is worth about $2,554,000 of value.

Conventions worth knowing

  • Ask what is being offered on new leases this week, not what was offered across the trailing year. Concessions move faster than any other revenue assumption.
  • Renewal concessions are frequently undocumented. A property offering a month free to renew has a concession the rent roll will never show.

The common mistake

Underwriting the burn-off without underwriting the reason

A pro forma that removes concessions in year one is making a market call, not a modeling choice: it says the property will lease at face rent when it cannot today. Sometimes that is right, because the concession existed to fill a lease-up and the lease-up is finished. Sometimes the submarket has new supply delivering for three more years and the concession is permanent. Before assuming burn-off, check what the competing properties are offering now, and if the concession stays, take it out of the market rent assumption rather than carrying a face rent nobody pays.

Related terms

Every figure, traced to its source

Altyst computes these in exact decimal arithmetic, not with a language model, and clicking any number shows the formula behind it.