Who runs your accounting after closing comes down to three setups: the buyer's finance team takes the function on day one, your own team keeps running it under a transition services arrangement, or an outside finance team runs the close through the handover. The setup decides who produces the first post-closing month-end close, and that close is usually the document the working capital settlement gets argued from.

Owners plan the handover of customers, staff, and keys. Almost nobody plans the handover of the close. So the first month after the wire lands arrives with no named owner, and the accounting function quietly stops producing at exactly the moment both sides need a number they can defend.

A transition services arrangement is a written agreement under which the seller's people keep performing named back office functions for the buyer after closing, for a stated period and a stated fee. It is one of three answers, and which one fits is a decision worth making before signing rather than in week three.

The three setups, side by side

What it decides	Buyer's team takes it day one	Your team runs it under a transition services arrangement	An outside finance team runs the close
Who produces the first month-end close after closing	The buyer's controller, in the buyer's system, on the buyer's calendar. Fastest to decide and the hardest to execute, because nobody on that team has ever closed a month in your business	Your controller or bookkeeper, in the system they already use, on the close calendar they already run	A named outside team, in whichever system the agreement points at, on a close calendar written into the engagement
Who holds the historical data and the access	The buyer, from day one. Ask what read access you keep and for how long, because your own post-closing obligations are answered out of those same records	Split. The records move at closing, your people still touch them, and who can export what is set by the agreement rather than by habit	A third party holds working copies, which is the easiest arrangement for both sides to argue from and the easiest to preserve after the engagement ends
Where a cutover error lands	On the buyer operationally and on you commercially, because a first close that misses accruals is still the close the settlement is calculated from	On your people, who are now doing two jobs at once, and the error rate tracks the workload	On the engagement, with a named owner for each step, which is the thing being paid for
What it asks of you after closing	Answers. You get asked questions for months, and the asking is unscheduled unless somebody schedules it	Management. You supervise staff who work for you and produce for the buyer, with divided loyalty and no org chart to settle it	Very little. That is what you are buying
What it costs and who pays	Nothing separate, so the cost arrives as errors rather than as invoices	A stated fee inside the transition services arrangement, or nothing at all, which is the most common version and the worst one	A stated fee under an engagement negotiated before closing, with the agreement deciding which side pays it
What makes it fail	Nobody wrote down how your close actually works, so the first one is an approximation and every later argument starts from an approximation	The controller resigns. Your strongest finance person has the most portable skills and the least reason to stay through a handover	Scope written loosely, so the outside team produces a close but not the reconciliations the settlement actually turns on

Letting the buyer's team take the function on day one is the cleanest break and the highest risk to the first close, because speed of decision is not the same as readiness to execute. Keeping your own team on under a transition services arrangement preserves the knowledge and moves the problem to retention and to your own calendar, since you are now managing people who report to you and produce for someone else. Putting an outside finance team on the close costs a fee that is visible in advance and buys a named owner for each step, which is worth most in exactly the situations where the settlement is large or the records are thin.

Setup one: the buyer's team takes the accounting function on day one

The buyer's team taking the function on day one works when the buyer already runs a finance organization and your books are clean enough to be picked up cold. That is a real scenario and it is the right answer more often than sellers expect, particularly when the buyer is a platform with a controller who has absorbed businesses before.

It fails on undocumented close mechanics. Every set of books carries judgment that lives outside the general ledger: which accruals get booked monthly, how revenue gets cut off, which reconciliations are run and in what order, what the recurring adjusting entries are and why. If that is in your controller's head rather than in a written close checklist, the buyer's team is rebuilding it from the ledger while producing a close under a deadline.

The fix is not complicated and it is worth doing whether or not you ever sell. A written close checklist with each step named, owned, and dated turns an undocumented process into a transferable one.

Setup two: your team keeps running it under a transition services arrangement

Keeping your own team on under a transition services arrangement preserves the close knowledge, and its whole risk is that the arrangement is usually written as an afterthought. The two questions that actually matter are what functions are named and who has authority over the people doing them.

Name the functions, not the outcome. The monthly close through a stated close date, bank and merchant reconciliations, accounts payable processing, cash application, payroll processing continuity: each named, each with a person attached. "Ongoing accounting support" is not a scope, and it becomes an argument the first time the buyer wants something your controller thinks is out of bounds.

Then settle authority. Your staff are producing work the buyer relies on while still reporting to you, which is a structure with no natural tiebreaker. Say in the agreement who directs the work day to day, who decides priority when the buyer's request and your own post-closing obligations collide, and what happens if the person doing the work leaves. That last one is not hypothetical. Retention through a handover is the single most common reason this setup collapses.

Setup three: an outside finance team runs the close through the handover

Putting an outside finance team on the close buys a named owner for every step at a fee agreed before closing, which is the only one of the three setups where the cost is visible in advance rather than discovered later. It fits best where the settlement is large relative to the deal, where the records need work, or where the seller's finance function is one person who is not staying.

It is also the only setup that does not depend on anyone's goodwill. The buyer's team has competing priorities. Your team has a job search. An engaged outside team has a scope and a deadline.

The failure mode is scope. A close is not the same as the reconciliations and schedules a settlement is argued from. Write into the engagement not just the monthly close but the specific supporting schedules the purchase agreement calls for, so that the deliverable matches the document rather than matching a standard month.

The First Close Test

Before you sign, run the First Close Test: name the person who will produce the first month-end close after closing, name the system it comes out of, and name the date it is due. If any of the three is not a name, a system, or a date, the accounting handover is an open item, and open items get settled by whoever holds the records.

Here is why the test carries weight, using a timeline stated only as an illustration. Assume your purchase agreement gives the buyer a set number of days after closing to deliver the closing statement, and gives you a shorter window to object to it. If the first close lands late because nobody owned it, your objection window starts running against a number you have not been able to check. The window does not extend because the accounting was slow.

That is the corollary, and it is the part worth remembering. Whoever produces the first post-closing close holds the pen on the number the settlement is argued from. Every other party is reviewing.

What has to run twice in the first month

Four things have to run twice in the first month after closing, once on the old side and once on the new, and each one produces a settlement argument when it does not. Payroll processing, so people get paid on schedule through the change in ownership, with any filing or treatment question routed to your CPA rather than resolved in the handover. Bank and merchant deposit feeds, so deposits that land after closing are traced to the period that earned them. Cash application, so a payment arriving after closing is applied against the correct owner's receivable rather than the convenient one. And accounts payable cutoff, so an invoice dated before closing is not paid out of the wrong period.

Which side those items belong to is set by your purchase agreement rather than by any general rule, and the definitions can differ from what feels natural. So the practical step is to pull the relevant definitions out of the agreement before the first month starts and write them at the top of the close checklist, in plain language, for whoever is doing the work.

Choose each setup when

Choose the buyer's team on day one if your close is documented step by step, your reconciliations are current through the closing month, and the buyer has absorbed a business before.
Choose a transition services arrangement if the close knowledge lives with one or two of your people, those people are staying through the handover, and you are willing to write named functions and a tiebreaker into the agreement rather than leaving both to goodwill.
Choose an outside finance team if the settlement is large relative to the deal, the records need work before anyone can close on them, or your finance function is one person who is leaving at closing.
None of the three saves you if the close was never documented in the first place. A handover plan is a way of moving a working process, not a way of creating one. If the monthly close only happens because you personally chase it, the setup question is premature and the close itself is the work.

Where Thryve fits

The accounting handover gets decided in the last two weeks before closing, which is exactly when nobody has the attention for it. The better version is boring: a documented monthly close with each step named and owned, reconciliations current through the closing month, and a written answer to the First Close Test before the purchase agreement is signed.

Thryve Accounting & Advisory builds that ahead of time. A clean monthly close, reconciliations that stay current, documented add-backs, and reporting a buyer's team can pick up without a translator. When the deal itself needs running, Texas Exit Advisors covers what happens after you sell your business, and M&A execution goes through Optima Mergers & Acquisitions.

If you are inside a year of a sale and cannot name who produces your first close after closing, that is the thing to fix first. It is a short conversation and it is worth having before the letter of intent, not after.

Last reviewed: September 2026. This is general information, not legal, tax, or accounting advice for your situation. The delivery and objection windows, what the settlement is calculated from, and which side owns a given receipt or invoice are set by your purchase agreement rather than by any general rule, so confirm each against the documents. Payroll filing and treatment questions belong with your own CPA.

Who Runs Your Accounting After Closing: Three Setups, Compared