Rent commencement date is the day a tenant's obligation to pay base rent begins under a commercial lease. It often falls weeks or months after the lease commencement date, because free rent or tenant build-out delays the first payment. The date anchors the rent schedule, escalation clock, and every downstream billing calculation.
What Is the Rent Commencement Date?
Rent commencement date is the calendar day base rent starts accruing, which is a separate field from the day the lease term legally begins. Per CARR, rent commencement does not necessarily occur on the same day as lease commencement, because a properly negotiated lease often grants a free rent period or allows time for tenant build-out before payment begins.
Per Stratafolio, in commercial leases rent commencement often occurs weeks or months after lease commencement to allow for tenant improvement work. The gap is the reason the two dates are abstracted as distinct fields. Rent commencement drives billing; lease commencement drives the term and every deadline that counts backward from expiration.
Field | What it starts |
Lease commencement date | The legal term, deadlines, and the tenant's right to possession |
Rent commencement date | The base rent obligation and the escalation clock |
Delivery date | Physical possession of the premises for build-out |
Why the Rent Commencement Date Matters
Rent commencement date matters because it sets the first dollar of income a landlord can bill and the first dollar of expense a tenant recognizes in operations. A date entered wrong by even a month misstates the rent roll, the escalation schedule, and the free rent already granted. On a $10,000 monthly lease, a one-month error is a $10,000 billing swing.
Under ASC 842, per FinQuery, a free rent period does not delay expense recognition: the rent-free months are folded into a straight-line expense spread across the full term, so accounting and cash billing diverge from the rent commencement date onward. The quotable point for an asset manager: lease commencement starts the clock on your rights, but rent commencement starts the clock on your cash.
Example
A lease has a lease commencement date of 2026-08-01 and grants three months of free rent for build-out. Base rent is $10,000 per month. The rent commencement date is 2026-11-01, three months later. The tenant occupies and holds the term from August, but the first rent payment is not due until November.
Item | Value |
Lease commencement date | 2026-08-01 |
Free rent period | 3 months |
Rent commencement date | 2026-11-01 |
Monthly base rent | $10,000 |
Cash rent collected, first 3 months | $0 |
Cash rent, months 4 to 12 | $90,000 |
Over the first lease year, the landlord bills $90,000 in cash, not $120,000, because rent commencement sits three months after lease commencement. Anchoring the rent schedule to 2026-11-01 rather than 2026-08-01 is what keeps the rent roll accurate.
Variations and Edge Cases
Rent commencement date behaves differently depending on how the lease ties it to delivery, build-out completion, or a fixed calendar date. A date that reads as fixed can float if it is defined by an event, so operators confirm the trigger, not just the date printed on the cover page.
Variant | Treatment |
Fixed date | Rent commencement is a stated calendar date regardless of build-out status |
Event-triggered | Rent begins X days after delivery or substantial completion, so the date can float |
Outside date | A backstop date after which rent begins even if build-out is late |
Partial rent commencement | Rent starts on delivered space while other phases remain free |
Landlord delay | Tenant-side delay clauses can push rent commencement to protect the tenant |
Rent Commencement Date vs Lease Commencement Date
Rent commencement date is often confused with lease commencement date, but they mark different obligations. Lease commencement date is the day the lease term legally begins, starting deadlines and the right to possession. Rent commencement date is the day base rent starts accruing, which is usually later because of free rent or build-out. Per Visual Lease, the lease commencement date usually constitutes the start of the term for all purposes regardless of occupancy.
Put simply, lease commencement answers "when does the term begin," and rent commencement answers "when does the tenant start paying." Confusing the two overstates income in the free rent window and corrupts every escalation that counts forward from the wrong date.
Frequently Asked Questions
What is the difference between rent commencement and lease commencement?Lease commencement is the day the lease term legally begins, starting deadlines and possession rights. Rent commencement is the day base rent starts accruing, which is often weeks or months later because of a free rent period or tenant build-out. Per CARR, the two do not necessarily fall on the same day.
Can rent commencement date change after signing?Yes, when the date is event-triggered rather than fixed. Many leases set rent to begin a stated number of days after delivery or substantial completion of build-out, so a construction delay moves the rent commencement date. Fixed-date leases do not float, and outside dates cap how far the date can slip.
Does a free rent period delay rent commencement?A free rent period is one of the most common reasons rent commencement falls after lease commencement. Under ASC 842, per FinQuery, the rent-free months are still spread into a straight-line expense over the full term, so accounting recognition and cash billing diverge from rent commencement onward.
Related Terms
Free Rent Period
Base Rent
Lease Critical Dates
Lease Abstract
Rent Escalation Clause