When you close on a business acquisition, you get the keys, the staff, and the financials.
The problem is that those financials were built to tell the seller’s story, not yours. They’re organized around the previous owner’s tax strategy, their vendor relationships, and the expenses they wanted to obscure or emphasize before a sale.
Running your new business off those books is like navigating with someone else’s map. The first 100 days after closing aren’t just about keeping the business running: they’re about rebuilding the financial foundation so you can see what’s actually happening and make decisions from accurate numbers.
There are five layers to that rebuild, and they follow a specific sequence.
Post-Close Purchase Price Allocation Sets The Foundation For Your First 100 Days
The purchase price allocation determines everything that follows: your depreciation schedule, your goodwill amortization, and how assets appear on your opening balance sheet.
If the allocation wasn’t handled carefully at close, your books will carry those distortions forward for years.
The IRS requires buyers and sellers to allocate the purchase price across asset classes under Section 1060, and the two parties often have opposing incentives for how they’d prefer to allocate.
The allocation you agreed to at close needs to be translated precisely into your accounting system, not approximated. Goodwill is generally amortizable over 15 years for tax purposes in an asset deal under Section 197 of the Internal Revenue Code, and getting that number right affects your tax position for the full amortization window.
Start here before anything else, because every downstream number depends on getting the allocation right.
Once it’s recorded, the next question is whether the P&L you inherited tells you anything useful about your actual go-forward business.
Seller Add-Backs In The Inherited Financials Are Not Your Post-Closing Baseline
During diligence, you reviewed EBITDA add-backs: the seller’s personal expenses run through the business, one-time costs removed to normalize earnings, and owner compensation adjusted to a market rate.
Those adjustments justified the purchase price, but they’re not your starting point for running the business.
Once you close, the P&L needs to reflect actual go-forward expenses, including your real debt service, your compensation structure, and any costs the seller excluded that you’ll actually incur.
A buyer who benchmarks against the seller’s add-back-adjusted EBITDA will consistently look more profitable on paper than they are in cash, and that gap catches up fast.
Reconstruct owner compensation (including a reasonable salary if you run the company as an S-corp), management fees, and any new professional service relationships from scratch in your chart of accounts with proper acquisition-focused accounting setup.
Once the P&L is recast, your opening balance sheet needs the same treatment so the deal is recorded as you actually structured it.
What Your Opening Balance Sheet Needs To Show After Closing The Deal
Your opening balance sheet reflects the business as you acquired it, not as it existed the day before close. That means recasting it to reflect your purchase price allocation, recording any assumed liabilities you took on at close, and clearing out assets that didn’t transfer.
Working capital pegs and net working capital true-ups deserve specific attention. Most acquisition agreements include a working capital target and a true-up mechanism if actual net working capital at close differs from the peg. That true-up can result in a payment in either direction, and it belongs on your opening balance sheet the moment it’s settled.
Many buyers miss this and end up with an unexplained imbalance six months later.
With the balance sheet set correctly, the next priority is clearing out the legacy systems and accounts the seller left behind, starting with the ones that carry the highest risk of creating payroll or cash problems.
Which Legacy Systems And Accounts Should You Clear Out First?
Most acquired businesses carry years of system sediment: old bank accounts the seller kept open, vendor logins tied to personal email addresses, payroll providers mid-contract, and accounting software organized around a chart of accounts that wasn’t yours.
Start with banking. You want new accounts in the new entity’s name before significant cash flow runs through the business. Then move to payroll, which is time-sensitive and error-prone during transitions. Employees inherited a payroll system built for the previous owner’s preferences; yours may need different deduction structures, different pay schedules, or a different provider entirely.
Accounting software deserves its own audit. The chart of accounts in the seller’s QuickBooks or Xero was built for them, often informally, over years. Cleaning it up while it’s recent is far easier than reconciling a chart you didn’t design after another 12 months of transactions accumulate.
Once the systems are clean, you have the data infrastructure to build a cash flow forecast that actually reflects your business.
Post-Acquisition Cash Flow Forecasting Starts With Your Actual Cost Structure
You can’t forecast cash flow from a P&L built for the seller. The first useful forecast comes after you’ve recast the P&L for your actual cost structure, including your real debt service on any SBA 7(a) or seller-financed portion of the deal.
For buyers who used SBA 7(a) financing, the monthly principal and interest payment is a fixed constraint the seller’s financials never reflected. Model that payment against realistic revenue projections, not add-back-adjusted revenue. The SBA publishes its loan program requirements, including coverage ratio expectations, and understanding that floor helps you set the revenue targets that actually matter.
Build a 13-week rolling cash flow forecast as your primary operating tool. Monthly P&L statements lag too far behind to catch problems in time. Thirteen weeks gives you enough runway to see issues forming and enough granularity to act.
Managing that forecast well is one of the clearest dividing lines between what a bookkeeper handles and what a fractional CFO brings to the table.
What Does a Fractional CFO Handle in the First 100 Days That A Bookkeeper Cannot?
A bookkeeper keeps your transactions categorized and your accounts reconciled. In the first 100 days after a closing, that’s necessary but not sufficient.
The decisions you’re facing, from purchase price allocation treatment to entity restructuring and reforecasting revenue assumptions, require someone who reads financial statements the way an investor does.
A fractional CFO brings pattern recognition from multiple acquisitions. They’ve seen what a misallocated asset purchase looks like at the 18-month mark and know which costs sellers routinely obscure.
Most acquisition entrepreneurs don’t need a full-time CFO in year one, but they do need that level of financial oversight during the post-close rebuild.
Ashford Sky works with acquisition entrepreneurs on post-close financial architecture, and the fractional CFO engagement typically covers purchase price allocation review, opening balance sheet setup, and the 13-week cash flow model. If the first 100 days feel like you’re flying with instruments you don’t trust, that’s the problem we help solve.
Multi-entity structures add another layer, and it’s one most first-time buyers underestimate.
Post-Closing Multi-Entity and Multi-Location Accounting Isn’t Optional
Buyers who acquire a business with multiple locations, or who plan to hold it under a parent entity alongside other acquisitions, need to get intercompany accounting right from the start. Running multiple entities through a single undifferentiated set of books is one of the most common first-year mistakes, and it creates reconciliation headaches that compound with every passing month.
Set up each operating entity with its own chart of accounts and its own reconciliation cadence. If you’re building a portfolio, establish the holdco’s books separately from each operating company. Intercompany loans, management fees, and overhead allocations all need explicit accounting treatment from day one.
This is also the moment to resolve multi-state sales tax and nexus exposure. The business you acquired may have created economic nexus in states the seller never registered in, and that liability transfers to you as the operating company.
A nexus review in the first 100 days is considerably cheaper than a multi-year back-tax assessment. That’s also the moment to decide when to bring in dedicated bookkeeping support.
When Should You Bring In Post-Acquisition Bookkeeping Support?
The answer is before close if possible, and no later than the first week after.
The post-close period moves fast. Payroll runs, vendor invoices arrive, bank accounts need to be reconfigured, and the seller’s team is only available for a limited transition window.
It helps to know which bookkeeping tasks come first when everything lands at once. Our guide to bookkeeping in the first 100 days walks through that order step by step.
Waiting until the chaos settles to start the books cleanup means the chaos becomes the books.
Our post-acquisition accounting and bookkeeping services are designed around the specific needs of post-close operating companies, not general small business bookkeeping.
The post-close accounting setup covers chart of accounts rebuild, opening balance sheet, payroll system transition, and the first 90-day reconciliation cycle.
If you’re still evaluating a target and want to understand what you’ll be inheriting before you commit, a pre-close financial review can walk you through what to look for before you sign.
Reach out to Ashford Sky to talk through what the rebuild looks like for your deal.
Until next time.
