Post-Acquisition Accounting: How One Buyer Fixed Books, Then Taxes

Post-Acquisition Accounting: How One Buyer Fixed Books, Then Taxes

Closing day feels like the finish line, and the first set of books you receive from the seller is where it stops feeling that way. Post-acquisition accounting is the work of making the company's numbers trustworthy under new ownership, and in the first year the order matters: get the books right, then plan the taxes.

Illustrative anonymized composite, drawn from recurring patterns rather than a single engagement. The firms named below were not involved in it. Every dollar figure is invented and rounded. Nothing here is guaranteed or predictive.

The buyer in this composite is a searcher who purchased a small services company. Two firms fit the two stages of the story, in sequence and not ranked. System Six is a Seattle bookkeeping and fractional CFO firm whose profile describes post-acquisition finance modernization, and it fits the first stage, rebuilding the close. Doug Johnson CPA is a Los Angeles boutique CPA firm for growing businesses and high earners, and it fits the second stage, planning the owner's tax once the numbers settle. System Six is a paid featured member of Sam's List. Doug Johnson CPA is a paid featured member of Sam's List.

What Post-Acquisition Accounting Looked Like on Day One

The company in this composite has about $3 million in revenue and a dozen employees. The seller's bookkeeper kept the books on a cash basis in a desktop file, and the seller's tax preparer filed the return from a different set of adjustments.

The buyer expected one set of numbers. What arrived was three: the books, the tax return and a seller's summary used in the sale. They did not agree.

Nothing sinister was behind it. Small companies often keep books for the owner's convenience and let the tax preparer make year-end adjustments on the side. That works for a seller who knows the story and fails for a buyer who does not.

The limitation: a mismatch between books and return is not proof of an error, since some differences are legitimate. It is proof that nobody has yet explained them.

Why the Books Did Not Match the Tax Return

The buyer's first task was a reconciliation, not a rebuild. Line by line, the question was why this year's book profit and taxable income differed.

Some gaps were ordinary. Depreciation was computed one way in the books and another on the return. A few personal expenses had been run through the business. The timing of a few large customer invoices also differed between the books and the preparer's year-end adjustments.

Two gaps were harder. A customer deposit was booked as revenue though the work had not been done, and the seller's loan to the company sat in the books with no paperwork the buyer could find.

The limitation: a reconciliation tells you where numbers differ, not which one is right. Some answers require the seller, the old preparer or a lawyer.

Finance Function Rebuild: What System Six Fit In

This is the stage a firm like System Six fits. The buyer in the composite needed the opening balances cleaned up, a monthly close with a checklist, and accrual-basis reporting a lender and the buyer could rely on. That is a finance function rebuild, and it is bookkeeping and fractional CFO work.

In the composite, the rebuild ran in order. First, set opening balances at the closing date and tie each balance sheet account to a bank statement, a loan document or a schedule. Second, move the books to accrual so revenue and expenses land in the right month. Third, set a close calendar, with bank reconciliations and a review done on a fixed day each month. Fourth, build a simple monthly package for the buyer: profit and loss, balance sheet, cash and a short list of open questions.

System Six is based in Seattle, was founded in 2009 and has about 41 employees. Its profile says it serves small businesses with $1 million to $10 million in revenue, and that it was itself acquired by a searcher in 2021. It describes helping organizations modernize a finance function after an acquisition. System Six did not work with the company in this composite, and nothing here describes its results.

The limitation, plainly: its profile shows a $1 million revenue minimum, so a company smaller than that may not fit. A profile also cannot tell you whether the firm has handled your accounting system, your lender's reporting or your deal structure, so ask for references from companies like yours.

Where Post-Acquisition Accounting Stalled

After about three months, the composite company had a clean close. It also had three open items the rebuild could not close alone.

The deposit booked as revenue was corrected, but the customer disputed part of the work, so the amount stayed in limbo. The seller's loan stayed unresolved because the paperwork was missing, and the buyer had to treat it as a legal question. The first quarter after closing also showed a lower margin than the seller's summary, and nobody could say how much came from the seller's numbers and how much from the new accrual basis.

That is a normal result. A rebuild creates reliable numbers going forward and exposes problems, but it does not repair the past. A first-year buyer should expect an unresolved list, not a clean slate.

The limitation: do not read a lower first-quarter margin as proof the seller overstated anything. Method changes, one-time costs after closing and seasonality can all explain it.

Post-Acquisition Tax Planning Starts Once Numbers Settle

Tax planning built on unsettled books tends to inherit their errors. That is why, in this composite, the buyer waited until the first full set of closed months was in hand.

The questions then were specific. How was the purchase price allocated among assets, goodwill and other items, and does the allocation agree with what was reported on the deal paperwork? In an asset purchase, the allocation of price among asset classes is generally reported to the IRS on Form 8594 and affects depreciation and amortization. How is the owner paid, and does the entity type still fit? Which first-year costs, such as deal expenses, are deducted and which are capitalized?

This is post-acquisition tax planning, and it is where a CPA firm like Doug Johnson CPA fits. Its profile positions the firm as a CPA firm for growing businesses with $250,000 to $10 million in revenue and for high earners with equity compensation, and it lists SMB owners, equity compensation, high net worth individuals and growing companies among its specialties.

The limitation: planning that is only as good as the allocation it rests on. If the deal paperwork and the books disagree, the planning has to wait for the disagreement to be resolved.

What the Owner's Tax Conversation Covered

The buyer in this composite sat down with a CPA to work through three things. These are illustrations, not advice.

First, entity and pay. The buyer reviewed how the business is taxed and how they pay themselves, since an owner's salary and distributions have different tax effects and the right mix depends on the facts.

Second, purchase accounting. The CPA compared the allocation of price to the opening balances in the rebuilt books. Goodwill acquired in an asset purchase is generally amortized over 15 years for tax under Section 197, though how much of the price lands there depends on the deal, and a stock purchase without a special election generally does not produce that amortization.

Third, a first-year calendar. The buyer asked for estimated tax dates, a decision on which deal costs to capitalize, and a list of questions to settle with the seller's preparer before filing.

The limitation: none of this is a recipe. Deal structure, whether the purchase was of assets or of equity, the entity type and the state all change the answer, so the CPA's advice in this composite would not fit your deal.

Doug Johnson CPA and Where It Fits

Doug Johnson CPA is a boutique CPA firm in Los Angeles, founded in 2024, with about 3 employees. Its profile says it serves clients nationwide, with minimums of $250,000 in income and $250,000 in revenue.

Doug Johnson CPA has 15 verified client reviews on Sam's List as of 2026-10-02. Each review is submitted by an individual who identifies as a client of the firm and rates it on communication, subject-matter knowledge, and overall satisfaction. Reviews reflect those individual experiences and do not represent an endorsement by Sam's List. Doug Johnson CPA is a paid featured member of Sam's List. Ratings and rankings are not indicative of future performance or results.

The limitation, plainly: a team of about 3 has limited capacity, so ask about availability around filing deadlines. A firm founded in 2024 has a short track record, so ask for references. Its profile does not say it handles purchase price allocation or Form 8594, so ask whether it does and what it charges.

What Worked, What Did Not and What Stayed Unresolved

By the end of the first year in this composite, the buyer had monthly closes on accrual, reports that matched the bank statements and a documented tax plan for the year. Those are real gains, and they are the point of doing the work in this order.

Other things did not resolve. The customer dispute dragged into the next year. The seller's loan needed a lawyer. The first-year tax result was not as low as the buyer had hoped, because several costs had to be capitalized rather than deducted. The cost of the rebuild also came out of a thin first-year cash cushion.

Different companies and different deals would see different results, and the two firms did not work on this composite. What the composite does show is a sequence: reconcile, rebuild the close, then plan the tax on numbers you trust.

Frequently Asked Questions

What is post-acquisition accounting?

Post-acquisition accounting is the work after closing of getting the acquired company's books accurate, tying opening balances to the deal, setting up a monthly close and reporting under the new owner. It also includes recording the purchase correctly for tax. The scope depends on the deal and the condition of the seller's records.

Should I fix the books or plan taxes first after buying a business?

Usually the books, because tax planning built on unsettled numbers inherits their errors. That does not mean waiting for perfect books. A CPA may want to speak to you early on filing dates and deal-related elections, so ask both firms about timing at the start.

What is a finance function rebuild?

A finance function rebuild is setting up the processes that produce reliable numbers: reconciled accounts, a monthly close calendar, accrual reporting and a regular package for the owner and lender. A bookkeeping or fractional CFO firm may do some or all of it, so ask what is in scope.

When should a buyer bring in a CPA for tax planning?

Many buyers talk to a CPA before closing about structure and again once a few months of clean books exist. The first-year allocation of purchase price, owner pay and entity choice all affect the tax result, and some deadlines come earlier than you might expect.

If you are in your first year after closing, browse fractional CFOs on Sam's List, including the firms above, and ask each what its first 90 days would cover.

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About the author: Kimberly Green is cofounder of Sam’s List, a directory and matching platform for financial professionals.