In law, the date of commencement is the point at which a contract, lawsuit, policy, or other legal arrangement actually becomes active and enforceable. It is not the same as the date a document was signed. Parties can sign an agreement on one day and specify that it takes legal effect weeks or months later, and nearly every deadline, payment schedule, and legal right tied to the arrangement runs from the commencement date rather than the signing date.
Confusing the two is one of the most common ways people miss a filing deadline, lose a lien right, or trigger a coverage gap they didn’t know existed.
Commencement Date vs. Execution Date
The execution date is when the parties sign. It records that everyone agreed to the terms at a specific moment. The commencement date is when those terms switch on and the parties become legally bound to perform.
In many contracts the two dates match. In many others they don’t. Two businesses might sign a services agreement on June 1 but write in that the contract takes effect on July 1. Until July 1, neither side owes the other anything. If the contract says payment is due “within 30 days,” that clock starts on the commencement date, not the signing date, unless the agreement explicitly says otherwise.
Delays between signing and commencement usually exist for a reason: one party needs time to hire staff, order equipment, secure permits, or wind down a prior arrangement before the new one begins.
How the Commencement Date Gets Set
Some contracts pick a fixed calendar date. Others tie commencement to an event that has to happen first. Lawyers call these events conditions precedent. Until the condition is satisfied, the agreement sits dormant. Once it’s met, the contract activates automatically or upon written notice.
Common triggering events include:
- Issuance of a government approval, such as a building permit, zoning variance, or regulatory license.
- Delivery and inspection of specialized materials or equipment on-site.
- Third-party clearances, such as a background check clearing, financing closing, or an insurance policy binding.
- A formal Notice to Proceed, used in construction and government contracts, in which the project owner authorizes the contractor to begin work. The notice starts the clock on performance deadlines, progress payments, and any delay penalties.
Parties usually confirm the triggering event in writing so there’s no later dispute about when the clock began. When the trigger depends on something nobody fully controls, like a regulator’s processing time, a well-drafted contract includes a drop-dead date: if the condition isn’t satisfied by then, either side can walk away.
Commercial Leases Often Have Two Commencement Dates
Commercial real estate leases frequently distinguish between the lease commencement date and the rent commencement date, and treating them as the same thing can be an expensive mistake.
The lease commencement date is when the tenant gains physical access to the space. The tenant can move in equipment, start interior build-out, and prepare to operate. Rent typically isn’t due yet. The rent commencement date comes later, often after a free-rent period of several months or once the business opens to the public. If the landlord is handling construction, the rent commencement date is often tied to completion of that work or issuance of a certificate of occupancy.
Both dates matter. The lease commencement date usually controls when the overall lease term is measured from and when insurance and maintenance obligations begin. The rent commencement date controls when money starts changing hands.
Construction and the Notice of Commencement
Construction has a separate commencement document that lives outside the owner-contractor contract. In many states, the property owner or general contractor must file a Notice of Commencement with the local recording office before work begins. The notice publicly establishes that a construction project is underway on a specific property.
Its main significance is lien rights. Filing the notice sets a clear starting point for the timeline in which subcontractors and suppliers must send preliminary notices, record mechanics’ liens, or take other steps to protect their right to payment. It can also impose extra procedural requirements on sub-tier parties that wouldn’t apply otherwise, which reduces the owner’s lien exposure. States that require the notice set their own rules on content, fees, and deadlines; failing to file where required strips the owner of protections but does not invalidate the project.
Employment Start Dates
An employee’s commencement date, often called the date of hire, sets the clock running for a range of legal rights and employer obligations. Eligibility for Family and Medical Leave Act leave is measured from it,1Office of the Law Revision Counsel. 29 U.S. Code 2611 – Definitions and the Affordable Care Act’s cap on health insurance waiting periods runs from the date an employee becomes eligible for coverage, which is typically the start date or the end of a short orientation period.2Office of the Law Revision Counsel. 42 U.S. Code 300gg-7 – Prohibition on Excessive Waiting Periods If there’s any ambiguity about which day your employer treats as your official start date, it’s worth confirming in writing.
Tax Depreciation: The “Placed in Service” Date
For federal tax purposes, the commencement date for depreciating a business asset is not the purchase date. The IRS uses the “placed in service” date, which is the day the property is ready and available for its intended use. The asset counts as placed in service the moment it could perform its function, even if you aren’t actually using it yet.3Internal Revenue Service. Publication 946 – How To Depreciate Property
If you buy a machine in November but it isn’t installed and operational until February, depreciation starts in February. If it was fully operational in November, it’s placed in service in November regardless of whether you ran a single job through it. Rental property follows the same rule: a house bought in April, renovated for two months, and listed for rent in June is placed in service in June.
Legal Proceedings
In federal court, a civil action commences the moment the complaint is filed.4Cornell Law School. Federal Rules of Civil Procedure Rule 3 Not when the defendant is served, not when the defendant responds. Filing stops the statute of limitations clock and creates the case on the court’s docket. State courts generally follow the same principle, though procedural details vary.
A voluntary bankruptcy case begins the instant the debtor files a petition with the bankruptcy court.5Office of the Law Revision Counsel. 11 U.S.C. 301 – Voluntary Cases That filing also triggers an automatic stay, which immediately halts most collection actions, lawsuits, wage garnishments, and foreclosure proceedings against the debtor.6Office of the Law Revision Counsel. 11 U.S.C. 362 – Automatic Stay The precise time of filing is recorded because the stay applies from that moment forward. A creditor who repossesses a car at 3 p.m. when the petition was filed at 2 p.m. has violated the stay, even without knowing the petition existed.
Statutes of limitations complicate the picture further. The limitations clock runs from the date a cause of action accrues, which is generally when all elements of the claim are in place and the injured party has the right to sue. Under the discovery rule, the clock doesn’t start until the injured party knew or reasonably should have known about the injury and its cause, which matters most in medical malpractice and fraud. The lawsuit’s commencement date, meaning the filing date, must land before the limitations period expires. Missing that deadline by a single day typically bars the claim permanently.
Insurance Policies
Insurance brings its own commencement-related dates. When you apply for coverage, the insurer often issues a binder, a temporary proof of coverage that takes effect immediately while underwriting runs. The binder’s effective date and the permanent policy’s effective date may not align, so it’s worth confirming that one picks up exactly where the other leaves off.
Claims-made policies, common in professional liability and directors-and-officers coverage, add a retroactive date. That date fixes the earliest point in time from which the policy will cover wrongful acts. If the retroactive date is January 1, 2024, and a client sues in 2026 over work done in 2023, the policy won’t respond, because the alleged act predates the retroactive date. When switching insurers, the new policy’s retroactive date should match or precede the old one, or coverage for prior work disappears.
When the Commencement Date Is Disputed
Fights over the actual commencement date happen more often than people expect, and they get expensive. In construction, the owner may argue the contractor started late while the contractor insists the Notice to Proceed was delayed. In a lease, the landlord may claim the space was delivered on time while the tenant argues the build-out wasn’t finished. In litigation, the defendant may contest when the claim accrued to argue the statute of limitations has run.
The best protection is specificity in the underlying document. A fixed calendar date is cleanest. Where that isn’t possible, the contract should describe the triggering event precisely and require written confirmation when it occurs. Language like “work shall commence promptly” invites litigation. A sentence like “the commencement date shall be the date the contractor receives written Notice to Proceed from the owner” closes the door on it. When delay penalties or years of lease payments ride on a single date, the extra drafting work pays for itself.