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What is a cash proof and how is it different from a bank reconciliation?

Credex Advisors, a licensed CPA firm. Published September 2026. Last reviewed September 2026.

A cash proof (also called a proof of cash) reconciles a company's reported revenue and expenses to the cash that actually moved through its bank accounts over a period, usually the trailing twelve months and the two prior fiscal years. A bank reconciliation only proves that the cash balance in the books matches the bank statement on one date. A bank reconciliation can be perfect while the income statement is wrong; a cash proof tests the income statement itself. That is why lenders and buyers use a cash proof in due diligence, and why SBA SOP 50 10 8.1 requires one inside every lender engaged quality of earnings report on acquisitions of $3 million or more.

What a bank reconciliation does

A bank reconciliation is a bookkeeping control. On a given date, the bookkeeper takes the bank statement balance, adds deposits in transit, subtracts outstanding checks, and shows that the result equals the cash balance in the general ledger. It answers one question: is the cash balance right today?

It does not answer whether the deposits during the year were revenue, whether the disbursements were business expenses, or whether the revenue and expense totals on the income statement are complete. A business can reconcile its bank account every month and still report revenue that never arrived, omit deposits that went to another account, or run the owner's personal spending through cost of goods sold.

What a cash proof does

A cash proof is a diligence procedure. It works on the flow of cash over a period, not the balance on a date:

1
Every transaction is extracted from every account. Operating, payroll, savings, and card accounts for the whole period under review. Nothing is sampled.
2
Each transaction is classified. Customer receipts, transfers between accounts, owner contributions and draws, loan proceeds and payments, vendor payments, payroll, taxes, and personal items are separated.
3
Cash receipts are compared to reported revenue. Customer deposits, adjusted for the change in receivables and for sales tax, merchant fees, and refunds, should equal the revenue on the income statement. The difference is the revenue exception.
4
Cash disbursements are compared to reported expenses. Vendor and payroll payments, adjusted for the change in payables and accruals, should equal reported operating expenses. The difference is the expense exception.
5
The financial statements and tax returns are tied out. The reconstructed cash based income statement is compared to the reported financial statements and to the filed tax returns, and each difference is explained or flagged.

The output is a schedule for each period showing reported revenue, cash receipts, and the reconciling items between them, the same for expenses, and a list of exceptions with dollar amounts. Every number in the schedule traces to a bank transaction.

What a cash proof finds that a bank reconciliation cannot

Unreported deposits. Cash that went into an account the seller did not disclose, or receipts that were never booked as revenue. This is the most common finding in owner operated businesses and it changes the earnings in both directions: sometimes the business earns more than reported, and sometimes the deposits are loans or transfers that were counted as sales.
Personal spending in the business. Vehicles, travel, family payroll, and household expenses paid from the operating account and recorded as expenses. These become add backs if they are real and provable, and they are a warning sign if they are large.
Revenue that was booked but never collected. Invoices recorded as sales with no matching deposit, which inflates revenue and receivables.
Related party flows. Payments to or from entities the owner controls, at prices that will not continue under new ownership.
Timing. Deposits pulled forward or expenses pushed back around the year end to improve the picture.
Fabricated statements. In the extreme case, financial statements that do not correspond to any bank activity at all. A cash proof catches this on the first schedule.

Why lenders and buyers ask for it

An audit opines on financial statements at a year end and is rarely available for a business under $10 million in revenue. A tax return is prepared to minimize tax, not to show a buyer what the business earns. A broker's adjusted EBITDA starts from the seller's numbers and adds to them. The cash proof is the only procedure that starts from an independent source, the bank, and works back to the income statement. That is why the SBA made it a required component of the quality of earnings report under SOP 50 10 8.1, and why buyers on deals too small for a full QoE will often order a standalone cash proof.

How long it takes and what it costs

Done by hand, a three year cash proof on a business with several accounts takes weeks, which is why many firms sample it or skip it on smaller deals. Credex Advisors performs the full procedure on the Credex diligence platform, which extracts, classifies, and matches the transactions, so a CPA spends their time on the exceptions rather than the keying. A standalone cash proof covering the trailing twelve months and up to three bank accounts is a fixed $4,000 and is delivered in five to seven business days from complete documents. Inside a quality of earnings report the cash proof covers three periods and is part of the fixed fee.

What to send

Bank and card statements for every account for the period, the general ledger detail and financial statements for the same period, and the filed tax returns for the fiscal years under review. If the business uses a merchant processor or an invoicing system, the export from that system helps tie receipts to customers.

Sources

U.S. Small Business Administration, SOP 50 10 8.1, Appendix 15, effective October 1, 2026.
AICPA, Statements on Standards for Accounting and Review Services and consulting standards, for the distinction between an audit, a review, and a consulting procedure.
This article is general information and not accounting or legal advice for any particular transaction.

Frequently asked questions

Is a cash proof the same as a quality of earnings?

No. A cash proof is one procedure inside a quality of earnings. A full QoE also normalizes earnings, tests add backs, analyzes customers and margins, and measures working capital.

Can a lender accept a cash proof instead of a QoE?

For SBA 7(a) acquisitions of $3 million or more, no; the SOP requires a full QoE that includes a cash proof. For smaller deals and conventional loans, the lender sets its own standard, and many use a cash proof as the credit file support.

Does a cash proof replace the bank reconciliation?

No. The bank reconciliation is a monthly control the business should keep doing. The cash proof is a one time diligence procedure performed by an independent firm.

What if the seller will not provide bank statements?

That is itself a finding. A buyer or lender should not rely on financial statements that the seller will not allow to be tested against the bank.

Need a lender QoE in ten business days?

Fixed fees by purchase price, engaged by the lender, delivered from complete documents.