TSA Pre-Signing Review
Make Day One a non event. Before you sign.
Fixed-fee proposal in 48 hours. Senior team on day one. The first conversation is always free.
Day One in M&A is the first day the acquired business operates under new ownership, the day after a deal closes, when payroll has to run, orders have to flow, employees have to log in, and customers have to be served as if nothing happened. It is the moment when months of planning meet operational reality, and it is where the Transition Services Agreement earns its place, bridging the gap between what the buyer owns and what the buyer can yet operate. Day-One readiness is the proof of a sound TSA exit strategy, because a transition that fails on the first day rarely recovers on the second.
Day One is the first operating day under new ownership. The deal has closed, the business now belongs to the buyer, and it has to keep functioning without interruption. Customers expect their orders filled, employees expect to be paid, suppliers expect to be managed, and regulators expect filings to continue. None of that pauses for the buyer to get organized. The business runs on Day One or it visibly fails on Day One.
What makes Day One hard is that the business was, until the day before, an integrated part of a larger organization. Its payroll ran on the seller’s system, its orders flowed through the seller’s ERP, its email lived on the seller’s tenant, its bank accounts sat inside the seller’s treasury. On Day One the buyer owns the business but does not yet own the systems that run it. That gap is the central problem Day One readiness solves.
The bar for Day One is continuity, not reinvention. The goal is that the business operates exactly as it did the day before, with the change of ownership invisible to customers and employees. Ambition comes later. On Day One the only objective is that nothing breaks, which is a harder objective than it sounds when the operational ground has shifted underneath the entire business.
Certain functions have to work on Day One because their failure is immediate and visible. Payroll has to run on the first cycle, because employees notice instantly. Order to cash has to flow, because customers and revenue depend on it. IT access has to work, because employees cannot do their jobs without it. Banking and treasury have to function, because the business needs to pay and be paid.
A second tier has to work because its failure carries legal or regulatory consequence. Required filings have to continue without a gap. Insurance has to be bound from the moment of close, because an uninsured business is exposed from the first minute. Legal entities have to be properly established so the business can contract and operate in its own name. These are the obligations that do not forgive a transition excuse.
Behind each of these is either a capability the buyer has stood up or a service the seller will provide under the TSA. The Day One plan is the reconciliation of every must work function against its source: built by the buyer, provided by the seller, or covered by a third party. Anything that is not clearly sourced is a Day One risk, and Day One risks are the ones that become headlines.
The TSA exists precisely because the buyer cannot stand up every capability by Day One. For the functions the buyer is not yet ready to run, the seller continues providing the service after close, under the TSA, until the buyer migrates onto its own. Payroll keeps running on the seller’s system, orders keep flowing through the seller’s ERP, and the business keeps operating while the buyer builds replacements.
This makes the TSA the operational backbone of Day One. The services that are not yet the buyer’s own are the seller’s under the TSA, and the Day One plan depends on every one of those services being clearly scoped, priced, and live from the first day. A gap between what the buyer can do and what the TSA covers is a function with no source, which is the definition of a Day One failure.
The quality of the Day One experience therefore tracks the quality of the TSA. A complete service catalog, clear service levels, and well defined exit ramps mean the business runs on borrowed systems smoothly and migrates off them on schedule. A thin or vague TSA means the buyer discovers on Day One that a critical service was assumed but never contracted, with no time left to fix it.
Day One readiness is the discipline of confirming, before close, that every must work function has a source that will be live on the first day. It starts with a complete inventory of what the business needs to operate, maps each item to a capability the buyer is building or a service the seller will provide, and tests that mapping for gaps. Anything unmapped is escalated and resolved before signing, not discovered after.
Readiness also means rehearsal. Strong buyers do not assume the plan works. They test it: dry runs of the first payroll, validation that access provisioning will function, confirmation that filings and insurance are arranged, checks that the TSA services are live and the governance is in place. The point of rehearsal is to convert assumptions into verified facts before the day arrives.
Above all, readiness is built before signing, because that is when the buyer has the leverage to fix what is missing. A function discovered to be unsourced during the pre signing review can be added to the TSA or built into the plan. The same function discovered on Day One is a crisis. The whole purpose of the readiness work is to make Day One a non event, which is the highest compliment a separation can earn. The detail is covered in Day One readiness explained.
Day One is not just an operational milestone. It is the moment employees, customers, and the seller form their first judgment of whether the buyer has the business under control. A clean Day One builds confidence that carries through the rest of the transition. A messy one creates doubt that the buyer then spends months trying to undo, often while still firefighting the original failure.
A failed Day One also has financial consequences that ripple forward. A payroll miss damages trust with employees the buyer needs. An order to cash failure costs revenue and customer goodwill. A regulatory gap can carry penalties and scrutiny. These are not transition inconveniences. They are losses that the value creation plan then has to recover from, before it can even begin to add value.
This is why Day One readiness and TSA quality are inseparable, and why both are pre signing work. The buyer that treats Day One as the test of its planning, and the TSA as the bridge that has to hold on the first day, is the buyer whose transition starts from confidence rather than crisis. Making that happen reliably is the core of a disciplined pre signing review.
Day One is the first day the acquired business operates under new ownership, the day after closing, when payroll, orders, system access, banking, and customer service all have to function without interruption despite the change of ownership. The bar is continuity: the business runs exactly as it did the day before.
Because the business was an integrated part of a larger organization until the day before, running on the seller's systems. On Day One the buyer owns the business but not yet the systems that run it. Bridging that gap, often through the TSA, is the central Day One challenge.
The TSA is the operational backbone of Day One. For every function the buyer cannot yet run itself, the seller provides the service under the TSA from the first day. A gap between what the buyer can do and what the TSA covers is a Day One failure waiting to happen.
By confirming before close that every must work function has a source that will be live on the first day, mapping each to a buyer capability or a TSA service, testing for gaps, and rehearsing the plan. Readiness is built before signing, while the buyer still has leverage to fix what is missing.
The discipline of confirming every must work function has a source before close.
Read the article →Leaving the seller's systems cleanly once Day One is behind you.
Read the article →The inventory that sources every Day One function the buyer cannot yet run.
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Seven buyer-side moves to exit a Transition Services Agreement on time and below budget. The mark-up, the extension-fee curve, exit sequencing, and the 11-month calendar.
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Subscribe to The Day One Letter →A checklist without owners and sequence is a wish, not a plan. On a representative $48M-revenue carve-out, running ~200 Day-One line items across nine workstreams with named owners and explicit dependencies — rather than as a flat list — removes $2.1M of avoidable Day-One remediation cost.