Pillar guide
Due diligence checklist for buying a business
A printable, source-backed checklist organized by track — Financial/QoE, Legal, Operational, New York-specific, and Risk. Each item documents what to request, who reviews it, and what a green/yellow/red outcome looks like.
Last updated: July 21, 2026. Educational only — not legal, tax, lending, or investment advice.
How to use this checklist
Diligence runs in four tracks in parallel, not in sequence. Your attorney handles legal, your CPA handles financial/QoE, you (often with your broker) handle operational, and the New York-specific track is jointly owned. A good deal timeline under LOI is 30 to 90 days; build the timeline into your LOI rather than asking for an extension later.
The SBA lists the documents buyers should expect to review at a high level: letter of intent, confidentiality agreement, contracts and leases, financial statements, tax returns, sales agreement, and purchase-price adjustment [1] . The list below goes deeper.
To print: use your browser's print function (Cmd/Ctrl + P). The print stylesheet hides the site chrome and produces a clean checklist.
Tip: Print this page (Cmd/Ctrl + P) for a working copy of the full checklist. The site navigation, footer, and CTA banners are hidden in print.
Financial / Quality of Earnings
Reviewed by: Your CPA
Legal
Reviewed by: Your attorney
Operational
Reviewed by: You + your broker
New York-specific (don't skip)
Reviewed by: Attorney + CPA + you
Risk / red flags
Reviewed by: You + CPA + attorney
Red flags — a diagnostic, not just a list
Most lists of "red flags" are laundry lists. A more useful question is: what pattern does this red flag point to?
- Revenue up, gross margin down. Pattern: the business is buying revenue — cutting price to grow volume. Structural. Often gets worse, not better, post-close.
- Payroll below BLS benchmarks. Pattern: owner is paying under-market wages to make SDE look better. Post-close, wages rise to market and SDE drops. Compare to BLS QCEW (county + industry) and OEWS (occupation) [7] [8] .
- One customer > 25% of revenue. Pattern: customer is effectively the asset. Price as if that customer might leave (because they might).
- Recurring "one-time" expenses. Pattern: the seller is dressing up ongoing costs as add-backs. The QoE analyst catches this by asking for the prior three years of GL detail.
- Family members on payroll. Pattern: if the family member does real work and you'll need to replace them, the SDE is overstated by their salary.
- Declining owner compensation in last 12 months. Pattern: pre-sale earnings inflation. The owner cut their own salary to inflate SDE for sale. Reconstruct SDE using a trailing three-year average of owner comp.
- Pressure to skip QoE or to use only the seller\'s attorney. Pattern: the seller has something to hide. Walk.
New York-specific diligence — in more detail
These items are the ones most often missed by national guides and out-of-state buyers. Each one can create post-close liability if mishandled.
- Sales tax successor liability. New York can hold a buyer of a business's tangible personal property liable for the seller's unpaid sales tax unless the buyer follows the bulk-sale / successor-liability process with the NYS Department of Taxation and Finance [2] . The mechanics: either the seller provides a statement certifying no sales tax is due, or the buyer withholds from the purchase price and remits the withheld amount to cover any potential liability. Confirm the current form and process on the Tax Department site before closing.
- UCC-1 lien search. Search the UCC-1 filings against the seller entity at the NYS Department of State [3] . Any liens on equipment, inventory, or receivables must be released or formally assumed at closing — unreleased liens can follow the assets.
- Workers\' comp, statutory disability, Paid Family Leave. Most New York employers must carry these. Coverage must be in force on day one of closing — a gap can expose the buyer to direct liability and penalties [4] . Confirm the seller's coverage and arrange continuation or new policies.
- Unemployment Insurance registration. The buyer entity must register with the NYS Department of Labor, typically via Form NYS 100, when taking on employees [5] [6] . In an entity purchase, the existing UI account may continue; in an asset purchase, the buyer usually opens a new account.
- License transfers. Food service, alcohol, childcare, healthcare, professional services, transportation, and cannabis each have their own NYS licensing authority and transfer rules. Some licenses cannot transfer at all; some require the new owner to qualify individually. Confirm with the relevant authority before LOI, not after.
- Real-property transfer tax. If the deal includes real property, or transfers a controlling interest in an entity that owns real property, New York's RPT and (in NYC) additional taxes likely apply. Review with a New York real-estate attorney.
- NYC-specific overlays. If the business is in NYC, the NYC Business Tax, the Commercial Rent Tax (in certain Manhattan zones), and additional NYC license requirements may apply. Don't assume NYC = NYS for regulatory purposes.
Where to go next
- See the whole acquisition process — How to buy a business in New York
- Reconstruct the SDE you verified — SDE vs EBITDA + calculator
- Scope revenue, add-back, and working-capital proof — Quality of earnings for small-business buyers
- Apply the operational checklist to manufacturing or trucking and logistics
- Check what you can afford — Affordability calculator
- Find targets to diligence — How to find businesses for sale in New York
Frequently asked questions
How long should due diligence take?
30 to 90 days under LOI is typical for a small-business acquisition. Smaller and simpler deals can close in 30–45 days; deals involving SBA financing, real property, or licensed industries often need 60–90 days. Build the timeline into your LOI — asking for an extension at day 55 puts you in a weaker negotiating position than asking for what you need up front.
Do I need a CPA for due diligence?
For any deal above roughly $250K purchase price, yes — a CPA running a Quality of Earnings (QoE) review is standard. A QoE is different from a tax return or audit; it's a reconstruction of the business's real cash flow, with add-backs the lender will and won't accept flagged. The cost is typically a fraction of the deal value and frequently saves multiples of its cost in price renegotiation or by killing a bad deal before you close.
What's the difference between legal, financial, and operational due diligence?
Legal diligence (your attorney) verifies entity status, contracts, leases, IP, employment, litigation, and NYS-specific filings like UCC-1 and bulk-sale notice. Financial diligence (your CPA) reconstructs SDE/EBITDA and identifies red flags in the numbers. Operational diligence (you, often with your broker) covers site visits, employee interviews, customer concentration, supplier relationships, and the condition of inventory and equipment. They run in parallel, not in sequence.
What kills deals in diligence?
Not the obvious problems — those are usually already priced in. It's the undisclosed ones: the undisclosed family member on payroll, the undisclosed pending sales-tax assessment, the undisclosed lease renewal the landlord plans to renegotiate at a 40% increase, the undisclosed customer concentration that one account opening would erase. The job of diligence is to find what wasn't in the listing.
What is a UCC-1 search and why do I need one in New York?
A UCC-1 financing statement is a public record that a lender has a security interest in a business's assets (equipment, inventory, receivables). Search the UCC-1 filings against the seller at the NYS Department of State. Any liens that haven't been released at closing can follow the assets to the new owner — meaning you could inherit the seller's secured debt. Get lien releases in writing before close.
What is successor liability for sales tax in New York?
In New York, a buyer of a business's tangible personal property can be held liable for the seller's unpaid sales tax unless the buyer follows the bulk-sale / successor-liability process with the NYS Department of Taxation and Finance. The process typically involves either receiving a certification from the seller that no sales tax is due, or withholding a portion of the purchase price and remitting it to the Tax Department to cover any potential liability. Verify the current form and process on the NYS Tax Department site before closing — the rules have changed over time.
Under LOI and need a second set of eyes?
A free 20-minute call with Jason can flag the red flags most likely to matter in your specific deal — and tell you whether a full QoE review is worth the cost before you spend it.
Book a free callSources cited on this page
- 1 U.S. Small Business Administration. Buy an existing business or franchise. https://www.sba.gov/business-guide/plan-your-business/buy-existing-business-or-franchise (retrieved 2026-07-21) — Document list: LOI, NDA, contracts, leases, financial statements, tax returns, sales agreement, purchase-price adjustment.
- 2 NYS Department of Taxation and Finance. Sales and use tax. https://www.tax.ny.gov/bus/st/stidx.htm (retrieved 2026-07-21) — Bulk-sale / successor-liability rules. Verify current form and notice process before closing.
- 3 NYS Department of State. Corporation & Business Entity Database. https://apps.dos.ny.gov/publicInquiry/ (retrieved 2026-07-21) — Entity status; UCC-1 lien search.
- 4 NYS Workers' Compensation Board. WCB home. https://www.wcb.ny.gov/ (retrieved 2026-07-21) — Workers' comp, statutory disability, Paid Family Leave coverage.
- 5 NYS Department of Labor. Employers. https://dol.ny.gov/employers (retrieved 2026-07-21) — Unemployment Insurance registration (Form NYS 100); employer responsibilities.
- 6 New York Business Express. Business Express portal. https://www.businessexpress.ny.gov/ (retrieved 2026-07-21) — Common forms: DTF-17, NYS 100, DOS 1336, DOS 1239f, CE-200.
- 7 U.S. Bureau of Labor Statistics. Quarterly Census of Employment and Wages (QCEW). https://www.bls.gov/cew/ (retrieved 2026-07-21) — Employment/wage benchmarks by NY county and industry.
- 8 U.S. Bureau of Labor Statistics. Occupational Employment and Wage Statistics (OEWS). https://www.bls.gov/oes/ (retrieved 2026-07-21) — Wage benchmarks by occupation — useful for validating target payroll.