M&A Financial Due Diligence Checklist: Buy-Side and Sell-Side Guide

Global M&A activity roared back in 2025, with deal value climbing 43% to $4.7 trillion, which is also 20% above the ten-year average of $3.9 trillion. Given the scale of capital deployment, the stakes for getting due diligence right have never been higher.

In any M&A transaction, the buy-side is focused on uncovering every material risk before committing capital, while the sell-side must proactively compile accurate financial documentation to substantiate its valuation and build buyer confidence. Both sides benefit from a structured, thorough approach.

Buy-Side Financial Due Diligence Checklist: What every Acquirer Must Review Before Closing

Let us discuss the core components that make or break a due diligence exercise for acquirers.

How to Verify the Financial Statement Accuracy of accounts and financial health

The buyer’s starting point is obtaining and scrutinizing all audited and unaudited financial statements of the target company and its subsidiaries, together with independent auditor reports. Equally important is a review of auditor correspondence, management letters, and any special reports flagging past concerns about financial reporting.

Buyers should also request a list of liabilities not reflected in the most recent financial statements, current budgets, and projected cash flow statements.

Understanding the target’s accounting policies and any changes to them provides essential context for interpreting reported results.

Tax Due Diligence in M&A: Key Jurisdictions, Audits, and Hidden Obligations to Review

Buyers must map every jurisdiction in which the target files tax returns and pays taxes, covering income, payroll, sales-related taxes, and state-specific taxes. This requires copies of federal, state, and local tax filings for the three most recent closed years. Any tax audits, past or ongoing, must be disclosed along with all related correspondence.

Tax sharing or benefit agreements, including those tied to state unitary filings, must also be reviewed to surface hidden obligations.

Reviewing Debt, Loans and Financial Obligations during M&A Due Diligence

Buyers should obtain a schedule of all banks, creditors, and guarantors, along with the underlying instruments such as lines of credit, security agreements, mortgages, and outstanding letters of credit. Any financing arrangements between the company and its officers, directors, key employees, or shareholders must be scrutinized, as they can surface related-party conflicts or undisclosed obligations that materially affect valuation.

Physical Asset Due Diligence: Equipment and Property

Buyers should obtain a schedule of all physical assets and equipment, including details on ownership, finance leases, and security agreements. Inventory schedules, covering descriptions, locations, and quantities, are essential for assessing operational health.

For real property, title insurance policies, deeds, and all lease agreements must be reviewed, including any correspondence related to alleged defaults or disputes with lessors.

Sell-Side Financial Due Diligence Checklist

Before heading into the due diligence process, the sell-side must compile a comprehensive business summary covering customers, suppliers, competition, manufacturing processes, capacity utilization, and R&D activities. This should be accompanied by a legal entity chart and a list of related parties with their associated areas of business. Then, you must also compile your audited financial statements for recent years.

Once you meet these general requirements, the sell-side can turn its attention to the following areas:

Cash Position and Accounts Receivable Disclosure

Bank statements for the periods under review must be readily available. On the receivables side, sellers should prepare accounts receivable aging schedules for each period under review, along with documentation of the allowance for bad debt policy, revenue by customer, and credit and collection processes. Related-party receivables and any factored receivables must be clearly identified and disclosed.

Inventory Due Diligence

Sellers should document their inventory policies. Major supplier relationships and any concentration risks must be disclosed, along with hedges or forward contracts and their related accounting policies. Cost accounting policies, scrap expense data by month, cutoff procedures, and details on offsite or consigned inventory are all part of a complete inventory disclosure.

Property, Plant and Equipment

The sell-side must prepare a document on fixed assets with the capitalization policy, useful lives, and depreciation methods clearly documented. Capital expenditure schedules should distinguish between maintenance and growth spending and identify any internally capitalized costs or deferred investments that may affect normalized earnings.

Payables, Accruals, and Contingencies

Sellers should document the timing of payables recognition, provide accounts payable aging schedules, and detail payment practices. Significant accruals must be described in depth. Sellers should also confirm the absence of unsupported or excess reserves.

Employee-Related Liability Disclosures

Month-end payroll accruals and related tax liabilities must be documented, alongside the employee handbook and details on bonus, incentive, and piece-work arrangements. Employee benefit accruals, covering vacation, sick pay, health and welfare, retirement, post-retirement, and post-employment obligations, should be fully supported.

Any deferred compensation agreements, severance arrangements, retention packages, and change-in-control provisions must also be disclosed.

Income Taxes Obligations and Deferred Tax Asset Disclosure

Sellers must disclose all tax obligations, the status of outstanding tax audits, and their expected outcomes. Significant deferred tax assets and liabilities, and their realizability, must be supported by a thorough analysis.

Material tax advantages, such as net operating loss carryforwards, should be clearly identified and their limitations explained.

Get Expert M&A Financial Due Diligence and Valuation Support from Eqvista

M&A transactions are among the most consequential decisions a business can make, and the quality of financial due diligence often determines whether a deal creates or destroys value. Sellers who enter the process fully prepared command stronger valuations and build buyer confidence faster. Buyers who dig deep avoid costly surprises after close. In a market where trillions of dollars are changing hands, neither side can afford to treat due diligence as a formality.

Eqvista’s valuation and financial advisory services are built to support both sides of the table. Our data-backed valuation frameworks and M&A expertise equip founders, investors, and acquirers with the clarity needed to move decisively and negotiate from a position of strength.

Contact us to learn how we can support your next transaction with accurate, defensible valuations!