Due Diligence Checklist for Asset Purchase: The 2026 Complete Guide

When acquiring a business through an asset purchase (versus a stock or equity purchase), the buyer takes specific assets and assumes specific liabilities — but not the entity itself. This structure has important tax and legal consequences: the buyer gets a tax-basis “step-up” in acquired assets (depreciable over time, reducing future tax), specific liabilities can be left behind, and contracts typically require formal assignment with third-party consent.

This comprehensive checklist covers all 8 functional categories of asset purchase due diligence, with specific items every acquirer should review. It’s derived from Practical Law, ABA Business Law Section standards, and the 2026 M&A practitioner consensus. Whether you’re a strategic acquirer, PE platform, individual buyer, or sell-side advisor preparing a target for buyer scrutiny, this is the foundation.

CT Acquisitions runs sell-side M&A processes for founder-owned U.S. businesses. As part of our process we prepare targets to withstand institutional buyer diligence. This checklist is what we use internally and what we hand to sellers 6-12 months before going to market.

Legal & Corporate Diligence Items

• Articles of incorporation, bylaws, operating agreement, shareholder agreements.
• Corporate minute book, board resolutions for major decisions (last 3-5 years).
• Asset titles: real property deeds, vehicle titles, equipment lien searches (UCC-1, UCC-3).
• Material contracts: customer agreements (top 20), supplier agreements, distribution agreements, license agreements.
• “Anti-assignment” clauses: which contracts require consent for assignment.
• Pending litigation: lawsuits filed, settlement history, employment claims.
• Real property leases: terms, transfer/assignment restrictions, change-of-control provisions.
• Equipment leases.
• Insurance policies + claims history (5 years).
• Permits, licenses, certifications + transferability.

Financial Diligence Items

• Audited or reviewed financial statements (3-5 years): P&L, balance sheet, cash flow.
• Internal monthly financial statements (current year + 2 prior years).
• Income tax returns: federal + state (3-5 years).
• Quality of Earnings (QoE) report (commissioned by buyer or seller).
• Accounts receivable aging + bad debt history.
• Accounts payable aging.
• Inventory: composition, valuation method, slow-moving/obsolete reserves.
• Working capital: normalized level, seasonality, working capital adjustment at closing.
• Debt schedule: lender, balance, terms, prepayment penalties, security interests.
• Capex history (5 years) and forecast.
• EBITDA add-backs: owner compensation, personal expenses, one-time items.
• Customer concentration: top 20 customers as % of revenue (last 3 years).
• Supplier concentration: top 10 suppliers as % of COGS.
• Pricing trends + margin trends.

Tax Diligence Items

• Federal income tax returns (3-5 years) + audit history.
• State income tax returns + multi-state nexus analysis.
• Sales tax: collected/remitted by state, exempt customers, voluntary disclosure agreements.
• Use tax compliance.
• Payroll tax: 941s, 940s, state UI filings, IRS Form W-2 reconciliation.
• 1099 compliance for independent contractors.
• IRC Section 1060 asset allocation: how purchase price will be allocated across classes (cash, A/R, inventory, fixed assets, intangibles, goodwill).
• Transfer pricing if related-party transactions.
• R&D credit history.
• Pending tax audits.
• Tax-loss carryforwards (NOLs): IRC Section 382 limitations on usage post-acquisition.
• QSBS Section 1202 considerations.

Operational, IP, and Regulatory Diligence Items

Operational

• Org chart with reporting lines.
• Employee roster: title, tenure, compensation, recent promotions.
• Key customer contracts and renewal status.
• Key supplier contracts.
• Operating playbooks / SOPs.
• Customer satisfaction metrics, NPS, churn data.
• Marketing/sales pipeline.

IP & Technology

• Patents (US + foreign): issued, pending, abandoned.
• Trademarks: federal, state, common-law usage.
• Copyrights.
• Trade secrets + protection measures.
• Software: in-house, third-party licenses, open-source compliance.
• Source code: escrow agreements, ownership.
• Domain names, social media handles.
• Data: customer data ownership, GDPR/CCPA compliance, data breach history.

Regulatory & Compliance

• Industry-specific licenses (e.g., HVAC contractor license, healthcare CONs, professional licenses).
• Building permits.
• OSHA compliance + citation history (5 years).
• EPA compliance + violation history.
• HIPAA compliance (healthcare).
• FDA approvals (medical device, pharma).
• FCPA / anti-corruption compliance.

Environmental and Employment Diligence

Environmental

• Phase I Environmental Site Assessment (ESA) for all real property — standard.
• Phase II ESA if Phase I identifies Recognized Environmental Conditions (RECs).
• Underground storage tank (UST) registrations + closure docs.
• Hazardous materials handling: permits, manifests.
• Air permits, water discharge permits.
• Past or pending environmental enforcement actions.
• Environmental insurance: pollution legal liability (PLL) coverage.

Employment

• Employee handbook + policies.
• Employment agreements (all employees with written agreements).
• Independent contractor agreements + classification analysis (W-2 vs 1099).
• Non-compete + non-solicitation agreements + state enforceability.
• Benefit plans: health, dental, vision, life, 401(k), pension, ESOP.
• WARN Act compliance: 60-day notice required if 50+ employees affected by closing or mass layoff.
• Union/Collective Bargaining Agreement (CBA) status + expiration dates.
• Workers’ compensation claims (5 years).
• EEOC complaints + Title VII claims (5 years).
• I-9 compliance + E-Verify status.
• State-specific employment law compliance (CA Wage Orders, NY Labor Law, etc.).

FAQ: Asset purchase due diligence

What is asset purchase due diligence?

The process of investigating a target business before acquiring its assets (versus its stock). Covers 8 functional categories: Legal & Corporate, Financial, Tax, Operational, IP & Technology, Regulatory & Compliance, Environmental, Employment.

How long does asset purchase due diligence take?

Typical timeline: 30-60 days post-LOI signing with legal counsel and accounting/tax counsel engaged. Complex acquisitions can take 90 days.

What’s the difference between asset purchase and stock purchase diligence?

Asset purchase: buyer takes specific assets and assumes only explicitly-listed liabilities. Stock purchase: buyer gets the entire entity including all liabilities (known and unknown). Asset purchase diligence focuses more on contract assignability, IRC Section 1060 allocation, and successor liability risks.

What is IRC Section 1060?

IRS rule requiring buyer and seller to allocate purchase price across asset classes (cash, A/R, inventory, fixed assets, intangibles, goodwill) using a residual method. Buyer and seller must agree and report consistently on Form 8594.

What is a Phase I Environmental Site Assessment?

Standard environmental due diligence for real property: records review, site inspection, interviews. Identifies Recognized Environmental Conditions (RECs). Required for CERCLA “innocent landowner” defense.

What is the WARN Act?

Worker Adjustment and Retraining Notification Act: requires 60-day advance notice to employees, unions, and government for plant closings or mass layoffs affecting 50+ employees. Applies to employers with 100+ employees.

What contracts typically need consent in asset purchases?

Most material contracts have “anti-assignment” clauses requiring third-party consent. Common: customer master agreements, supplier agreements, real estate leases, software licenses, distribution agreements. Identify these early; chasing consent late delays closing.

What is Quality of Earnings (QoE)?

Independent third-party review of EBITDA to validate normalization adjustments. Buyer typically commissions or accepts seller-side QoE from Big 4 / specialty firms. See our QoE guide.

Who runs asset purchase diligence?

Lead by buyer’s deal team (in-house M&A or external advisor like CT Acquisitions on buy-side). Specialty workstreams handled by: legal counsel (corporate/contracts), tax counsel, financial advisors (QoE), environmental consultants, HR specialists.

How does CT Acquisitions help sellers prepare for diligence?

As part of our sell-side process, we run a “diligence readiness” review 6-12 months pre-market: identify gaps in the 8 categories, prep clean documentation, address any deal-breakers before buyer scrutiny. Our buyer-paid model means the seller pays nothing for this preparation.

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• Mortgage company acquisition due diligence checklist
• What is Quality of Earnings (QoE)?
• What happens during due diligence?
• Asset sale vs stock sale
• Equity rollover for founders
• Private equity in HVAC 2026