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Key takeaways
- Rebuild the seller’s forecast for the buyer’s actual transaction terms.
- Treat net cash outflow as one input, not a complete reserve requirement.
- Confirm that each funding source is available when the business needs it.
Short answer
Start with the buyer’s payments and receipts, organized by date. Include payroll, rent, suppliers, taxes, debt payments and necessary transition spending without counting the same cost twice. Identify which collections actually belong to the buyer. The working-capital guide explains the detailed cash sequence and closing-account analysis.
The seller’s forecast is useful evidence, but its assumptions may describe a different business owner. A purchase that excludes old receivables can leave the buyer paying current bills while those collections go elsewhere. A new software contract or staffing arrangement can also change the cash needed immediately after closing.
Longer answer
First separate accounting working capital from spendable cash. The SEC’s financial statement guide describes a balance sheet at a particular date and cash flows across a period. A positive balance of current assets over current liabilities therefore does not, by itself, establish that payroll cash is available on Tuesday. (Source: SEC financial statements guide)
Use supporting records to test the forecast. IRS guidance explains that purchases, sales, payroll and other transactions generate documents behind the books. For this exercise, match appropriate summaries and records to the forecast’s amounts and dates. A total copied from an income statement does not prove the cash will arrive as expected. (Source: IRS recordkeeping)
Review receivables by payer and service period. The AR aging definition helps explain why the age of an invoice and the amount billed do not establish collection timing. Confirm the contract treatment of preclosing balances, refunds and any collection services the buyer will perform for the seller.
Next, distinguish recurring costs from money spent to complete the transition. SBA’s planning guidance separates one-time and recurring expenses when estimating capital needs. Apply that distinction to the buyer’s actual plans, without assuming every purchase creates the same transition costs. (Source: SBA expense planning)
What it depends on
The closing terms determine what starts in the buyer’s accounts. Read the working-capital peg definition alongside the purchase agreement. Excluded receivables, assumed bills and price adjustments need consistent treatment across the closing statement and forecast. An unexplained difference is a question to resolve, not an extra source of cash.
Timing can matter more than the monthly total. Mark the dates of large payroll runs, tax payments and expected collections. Test a documented delay or staffing cost increase rather than adding a percentage simply because it looks conservative. State the reason for the chosen minimum cash balance and how it would be funded.
Financing needs its own evidence. SBA lists working capital and ownership changes among possible 7(a) uses, while eligibility and the lender’s review still apply. This does not establish that an acquisition loan will include the buyer’s requested reserve or fund it by the needed date. (Source: SBA 7(a) program)
The lender underwriting guide helps organize that discussion. Keep a proposed loan, an undrawn line with conditions and cash already available in separate forecast entries. Avoid counting the full stated facility as immediately usable money without reviewing its terms.
Example
Assume a fictional buyer receives a forecast showing $100,000 of first-month collections and $120,000 of payments. The draft purchase terms leave $35,000 of those collections with the seller. The buyer also identifies $10,000 of necessary transition training and systems spending that was omitted from the first forecast.
| Successive version of the same fictional forecast | Buyer receipts | Buyer payments | Net cash outflow |
|---|---|---|---|
| Seller’s starting forecast | $100,000 | $120,000 | $20,000 |
| Remove seller-retained collections | $65,000 | $120,000 | $55,000 |
| Add omitted buyer transition spending | $65,000 | $130,000 | $65,000 |
Each row replaces the previous version; do not add the three outflows. The corrected version uses $45,000 more cash during the month than the starting version. That difference comes from $35,000 less buyer cash received and $10,000 more paid.
All amounts are invented. The example excludes the purchase price, financing proceeds and other unlisted costs. It assumes the remaining receipts are collected and the listed payments occur within the month. It does not establish that $65,000 is a sufficient opening reserve: payments may come first, and a chosen minimum cash balance would need separate funding.
What to do next
Give the advisers a marked forecast showing each change from the seller’s assumptions and the record supporting it. Identify unresolved receipt rights, missing payment dates and proposed funding. Use the financing options guide to compare appropriate sources after the cash need is defined.
Then reconcile the plan with proof of funds and the first 90 days handoff. Assign responsibility for updating actual receipts and payments. A funded forecast should remain useful after closing, when real cash movements reveal which assumptions need attention.
Frequently asked questions
Is a fixed number of months of expenses enough?
A monthly expense rule can hide the timing and ownership of receipts. Build the actual dated forecast, then test specific delays and costs. Any reserve target should follow that analysis and the requirements of the transaction and lenders. This FAQ supplies no standard number of months.
Does the closing working-capital peg equal my cash reserve?
No. A peg measures agreed closing accounts under the purchase terms. An operating reserve concerns the cash available to meet payments. The balances, exclusions and adjustments may differ. Reconcile both schedules so an accounting adjustment is not mistaken for money available for payroll.
Can I count old receivables if I help the seller collect them?
Collection work does not by itself establish that the money belongs to the buyer. Read the purchase terms and any collection arrangement. Track whose receipts they are, where they must be sent and whether any fee is due. Keep seller-owned amounts out of buyer funding until the treatment is confirmed.
Does an approved acquisition price settle the reserve amount?
No. Price, financing and operating cash answer different questions. The business may need cash after closing even if the agreed price is supported. Update the forecast when the closing date, payer timing, staffing plan or transaction terms change, and confirm the funding for the resulting need.
Sources
Sources are dated to distinguish current guidance from earlier publications. They support the identified facts; the transaction questions and examples are educational analysis.
- SEC: Beginners Guide to Financial Statements (2014). Retrieved September 6, 2026.
- IRS: business recordkeeping (2026). Retrieved September 5, 2026.
- SBA: 7(a) loans (2026). Retrieved September 5, 2026.
- SBA: buying an existing business or franchise (2026). Retrieved September 5, 2026.