Commercial Lease Rent Commencement Checklist: Start Billing With Confidence

The costly mistake is rarely that a landlord forgets there is a lease. It is that the lease becomes operational before anyone can agree on which event started rent.

Keys may be handed over. A tenant may begin construction. The store may open. A permit may arrive. None of those events automatically tells accounting what to invoice unless the executed lease says it does. When leasing, property management, and accounting each keep a different date in a spreadsheet, the first invoice can go out too early, too late, or with a concession applied to the wrong charge.

This checklist is designed for the handoff between signed lease and first billing. It is not legal or accounting advice. The executed lease, its amendments, and applicable advice from counsel or accounting professionals control when a question is unclear.

Start With the Right Question: What Exactly Commenced?

“Commencement” is often used as shorthand for several different dates. Before setting up a tenant, separate them.

| Date or event | What it may control | What to verify | |---|---|---| | Possession or delivery | When the tenant can access the premises | Delivery condition, key handoff, delivery notice | | Lease commencement | Start of the lease term | Defined term and any adjustment mechanism | | Rent commencement | When base rent becomes payable | Trigger, notice, free-rent language, proration | | Additional-rent start | When CAM, tax, insurance, utilities, or other charges begin | Each charge’s specific lease language | | Opening date | Operational milestone for the tenant | Whether it is actually a rent trigger | | Expiration date | End of the term | Whether it moves when commencement changes |

Do not copy an expected opening date into the rent roll just because it is the only date available. A rent commencement clause may be tied to a landlord-delivery event, a tenant permit, completion of work, a fixed outside date, or another condition. It can also interact with tenant delay provisions, free rent, and amendments.

For the broader date map, use the commercial lease commencement-date checklist. This checklist focuses on turning that answer into a supported billing handoff.

The Commercial Lease Rent Commencement Checklist

1. Gather the complete deal record before reading the dates

Start with one current folder or record for the deal. At minimum, include the fully executed lease, all amendments, exhibits that affect rent or work, guaranty if relevant to your process, notices, and the latest approved abstract.

This step sounds basic, but commencement issues often begin with a missing amendment. A leasing coordinator may be working from the signed lease while accounting receives a separate email granting extra free rent or extending a delivery deadline. If it is not executed or otherwise approved under your process, flag it for review instead of quietly changing the billing schedule.

Checklist:

• Executed lease is complete and legible.
• Amendments, side letters, and commencement-related exhibits are included.
• The tenant legal entity, suite, and property match the setup request.
• The latest lease abstract identifies every date that could affect billing.
• The team knows who can resolve a conflict between documents.

If your abstract does not make separate fields for possession, term, base-rent, and additional-rent dates, fix that before the invoice stage. The commercial lease abstract checklist can help define the fields worth tracking consistently.

2. Read the rent commencement clause with its conditions

Find the rent commencement language and read the linked sections, not only the sentence containing the date. Look for conditions such as delivery of the premises, completion of landlord work, tenant work, permits, opening requirements, insurance certificates, notices, or an outside date.

Capture the clause reference, the trigger, the expected date, and the evidence required to confirm the actual date. If the clause uses terms such as “substantial completion,” “tenant delay,” or “ready for occupancy,” do not replace them with an operational guess. Confirm the meaning against the executed lease and involve counsel when interpretation or notice timing is disputed.

The output of this step should be a plain-language statement:

> Base rent begins on the date specified by the lease after the identified trigger is satisfied, subject to the documented concession and any required notice.

That statement is a working summary, not a substitute for the lease. Its value is that every team can test the setup against the same statement.

3. Collect proof of the triggering event

The property team should not have to reconstruct delivery six months later from memory. Save the records that show what happened and when. The appropriate evidence depends on the lease and property, but it may include a delivery notice, key receipt, construction completion record, permit, certificate, tenant acknowledgment, email confirmation, or a signed commencement agreement.

Record the source, date, author, and any open exceptions. A photo of keys on a desk is not a substitute for the evidence the lease requires. Likewise, a tenant’s early access for inspections may not be the same as contractual possession.

Use an evidence log with these fields:

• Trigger named in the lease
• Actual event date and time, if material
• Supporting document or correspondence
• Person who reviewed the evidence
• Open question, exception, or required follow-up

When the evidence is incomplete, set the deal to “needs review,” not “ready to bill.” That status prevents a missing document from becoming an invisible accounting assumption.

4. Separate base rent, concessions, and additional rent

“Free rent” should never be a single switch without details. A concession can apply to base rent only, to a defined period, or to specific charges. CAM, taxes, insurance, utilities, marketing fees, and other additional rent may have their own start dates and payment cadence.

Build a charge-by-charge schedule that shows:

| Charge | Contractual start | Concession or delay | First invoice period | Calculation support | |---|---|---|---|---| | Base rent | Lease-defined date | Free-rent terms, if any | Full or partial month | Rent schedule and proration method | | CAM estimate | Lease-defined date | Any stated exception | Monthly, quarterly, or other frequency | Budget, share, cap, exclusions | | Taxes and insurance | Lease-defined date | Any stated exception | Lease billing cadence | Estimate and allocation support | | One-time fees | Named event or date | Not applicable or stated waiver | Once | Lease section and approval |

For NNN and modified-gross leases, confirm the share, caps, exclusions, and billing frequency before creating recurring charges. The fact that base rent begins does not prove every recovery starts that same day.

For a closer look at the negotiation and setup risks around concessions, see free rent and rent commencement in NNN lease negotiations.

5. Create a single approved billing handoff

Most missed rent starts are handoff failures. Leasing knows the deal. Operations knows the space. Accounting receives an email with an assumed start date and has no lease reference to challenge it.

Use a short, standardized commencement handoff that all three functions can read. It should identify the lease source, confirmed trigger, billing dates by charge type, concessions, proration, evidence location, and open items. Keep the source documents linked to the handoff instead of scattering them across inboxes.

Before approval, ask these questions:

• Does the handoff distinguish contractual dates from internal invoice dates?
• Does it state whether a partial first month is required and how it is calculated?
• Does it identify charges that begin later than base rent?
• Can a reviewer trace each number and date back to the lease or supporting evidence?
• Is any unresolved interpretation clearly marked for counsel or accounting review?

One accurate record is easier to audit than three spreadsheets that happen to agree today.

6. Set up the tenant and charges without losing the lease context

Once the handoff is approved, configure the tenant using the legal name, suite, notice and billing contacts, payment instructions, and recurring charge schedule confirmed in the record. Preserve the lease source for each non-obvious setup decision.

Pay close attention to first-period proration. Do not assume every charge uses the same day count, denominator, or timing convention. If the lease is unclear, pause that line item and get it reviewed rather than creating a calculation the team cannot explain.

Also make sure the rent roll can distinguish what is due now from what is scheduled to start later. That matters when a tenant’s first month has base rent but no CAM estimate yet—or the reverse.

7. Review the first invoice before it reaches the tenant

Use a two-person check for the first invoice whenever practical. One reviewer compares the executed lease and commencement record; the other reviews the tenant setup, charge schedule, and invoice.

Confirm the rent start, concession treatment, additional-rent timing, proration, invoice period, payment instructions, and notices. Save the approved invoice with the billing handoff and supporting record.

If the tenant asks why it was billed, the answer should not require searching five inboxes. Your team should be able to show the relevant lease section, the confirmed trigger, and the calculation support.

A 10-Minute Go/No-Go Review

Before releasing the first rent invoice, ask:

• Do we have the executed lease and all relevant amendments?
• Which event triggered base-rent commencement, and what proves it occurred?
• Are possession, term commencement, rent commencement, and expiration recorded separately where needed?
• Have free rent, abatements, and delayed charges been applied by charge type?
• Are CAM, tax, insurance, and other additional-rent starts confirmed independently?
• Does the first-period calculation follow the lease’s stated method or an approved interpretation?
• Can accounting find the supporting evidence without relying on a verbal handoff?
• Has an appropriate reviewer cleared any unclear interpretation, notice, or timing issue?

Make the First Invoice Defensible, Not Just Timely

Speed matters, but a fast invoice built on an unverified date creates more work than a short review. The goal is not to turn every lease start into a legal project. It is to make sure the person who sends the invoice can see the same trigger, evidence, concession, and schedule that the rest of the team approved.

When commencement records and billing schedules stay connected to the lease, missed rent starts and avoidable corrections become easier to catch before the tenant does.

See how PigJet helps commercial landlords keep lease details and tenant billing organized.