HR Due Diligence Questions to Ask Before You Close

The most important HR due diligence questions are the ones whose answers change the price, the deal terms or the first 100 days. Who actually employs the workforce? What does the deal trigger in pay and severance? Are employees classified and documented correctly? What disputes, claims or union obligations come with the business? Below are the questions we ask on human capital due diligence for private equity sponsors and acquirers, grouped by category, with a note on why each group matters.

What is HR due diligence?

HR due diligence, also called human capital due diligence, is the review of a target company's workforce, pay, benefits, HR compliance and employment practices before an acquisition closes. Its job is to find people-related liabilities and costs early enough to price them, cover them in the purchase agreement, or plan around them after close.

1. Who employs the workforce, and where?

Start here, because every other answer depends on it.

• Which legal entities employ people, and under which EINs?
• How many employees work at each location, and which states (or countries) do remote employees work in?
• Does the company use a PEO or employer of record for any part of the workforce?
• Is the company a federal contractor or subcontractor?

Why it matters: Remote employees spread across states expand the compliance footprint: tax withholding, paid leave rules and wage and hour law all vary by state. Federal contractor status brings its own obligations, covered under compliance below.

2. What does the deal trigger in compensation?

• Which incentive plans exist (short-term, long-term, commissions, bonuses), and how are they calculated and paid?
• Who has change-of-control, retention or transaction bonus agreements, and what will they cost under this deal?
• What severance is promised, by plan or by individual agreement?
• Are payroll tax filings current, and is payroll run in-house or by a provider?

Why it matters: Change-of-control and severance obligations are real cash costs that rarely show up in EBITDA. Commission and bonus plans with unclear terms are a common source of disputes after close.

3. How are benefits funded and administered?

• Are health plans self-insured or fully insured?
• What do plans cost by coverage tier, and what do employees contribute?
• Are retirement and deferred compensation plans compliant, and is nondiscrimination testing done?
• How are enrollments, COBRA and carrier invoices handled?

Why it matters: Self-insured plans can carry claims incurred before close but paid after it. Weak benefits administration leads to billing errors and compliance gaps that land on the buyer.

4. Is the company compliant with employment law?

• How are employees classified as exempt or non-exempt, and does each classification hold up under federal and state salary and duties tests?
• Are Form I-9s complete for every employee, and is E-Verify used where required?
• How are independent contractors used, and would they pass a misclassification test?
• Are OSHA logs, EEO-1 reports and workers' compensation claims records current?
• If the company is a federal contractor, does it meet its remaining affirmative action obligations for veterans (VEVRAA) and individuals with disabilities (Section 503)?

Why it matters: Misclassification can mean back wages, penalties and taxes. A buyer that keeps the target's employees can treat their existing I-9s as its own, which means it also takes on any errors in them.

5. What employee relations issues come with the business?

• What complaints and internal investigations have there been in the last three years, and how were they resolved?
• Is there pending or threatened employment litigation, or any EEOC or state agency charges?
• Are any employees unionized? If so, when do the collective bargaining agreements expire, and are there open grievances or organizing activity?
• Have there been layoffs or site closings that could count toward WARN Act thresholds?

Why it matters: Patterns in complaints say a lot about management. Union contracts limit what a buyer can change after close and carry obligations the buyer inherits.

6. Can you trust the workforce data?

• Can the company produce a complete employee census with titles, pay, FLSA status, hire dates and managers?
• Does the org chart show open roles, contractors and contingent workers?
• Who is on leave, and does the company sponsor anyone's immigration status?
• Does the HR system keep history (pay changes, promotions, transfers), or only current records?

Why it matters: If the census can't be reconciled to payroll, every other finding is harder to rely on. Missing employee history makes it hard to check pay decisions or defend them in an audit.

7. Do policies and operations hold up?

• Does the handbook reflect the laws of every state where employees work?
• How is time tracked at each site, and is it the same everywhere?
• How do PTO accrual, payout and carryover work, and what balances are owed?
• What background screening is done, and is it compliant?
• Which HR, payroll and timekeeping systems are in place, and do they connect?

Why it matters: Inconsistent timekeeping is one of the most common sources of wage and hour exposure. Policies written for one state often miss requirements in others.

How to use an HR due diligence questionnaire

The questions above work best when they sit on top of a structured questionnaire, or document request list, sent to the target. A standard questionnaire keeps reviews consistent from deal to deal, speeds up analysis, and creates a clear record for the investment committee. With short deal timelines and limited access to management, it also lets you get more out of every meeting.

A few practices make the questionnaire more useful:

• Ask for data, not just documents. Request a full compensation census with base pay, bonus targets and actual payouts, commissions and equity grants, plus headcount by department, location, employment type and exempt status.
• Ask for history. Request at least three years of headcount data, along with open requisitions and hiring plans for the next 12 months.
• Specify the format. Ask for spreadsheets with a separate tab for each category so the data is easy to analyze.
• Cover the full picture. Include benefit plan documents, carrier contracts and claims experience; litigation, agency charges, audits and workers' compensation loss runs; HR system contracts and integration maps; and engagement surveys, turnover and exit interview summaries.

Then use the questions in this post during management meetings to test what the documents show.

When to ask these questions in the deal

1. Before or right after the LOI: send the full document request list so the target can load the data room early.
2. During management meetings: use the questions above to test what the documents show, especially on classification, timekeeping and key-employee retention.
3. Before signing: confirm open items, quantify the liabilities, and decide which belong in the purchase agreement as indemnities, escrows or closing conditions. See How to Quantify HR Liabilities in M&A Deals.
4. After close: turn the findings into an integration plan. See How to Build a 100-Day HR Plan After Acquisition.

If you're buying add-on companies, our HR Due Diligence Checklist for PE Add-On Deals goes deeper on the documents to request.

Get the full HR due diligence checklist

These questions are a starting point. The 29Bison HR Due Diligence Checklist turns them into 141 specific document and data requests across 21 categories, from compensation and benefits to compliance, employee relations and HR technology. Each request tells the target exactly what to provide, so you can drop it straight into your data room request.

Frequently asked questions

What questions should you ask in HR due diligence?

Ask who employs the workforce and where, what the deal triggers in pay and severance, how benefits are funded, whether employees are classified and documented correctly, what claims and union obligations exist, and whether the HR data can be trusted.

When should HR due diligence start in an acquisition?

Send the document request list before or right after the letter of intent. That gives the target time to fill the data room and leaves room to quantify findings before signing.

What are the biggest HR risks in an acquisition?

The most common are employee misclassification, incomplete I-9 records, change-of-control and severance costs, self-insured benefit claims, union obligations, and inconsistent timekeeping.

How is HR due diligence different from financial due diligence?

Financial due diligence checks the numbers. HR due diligence checks the workforce behind them: liabilities in pay, benefits and employment law, and what it will take to retain and integrate the people.

Is there a free HR due diligence checklist?

Yes. 29Bison's free HR Due Diligence Checklist lists 141 document and data requests across 21 categories, with instructions on what the target company should provide.

Why 29Bison?

29Bison works with private equity sponsors and acquirers on the people side of a deal. Before close, our HR due diligence reviews 150+ human capital risk items and ties each finding to your investment thesis. After close, we turn those findings into an integration plan, and our Fractional HR Operating Partners lead HR across portfolio companies.

Have a deal underway? Email contactus@29bison.com to talk through your target.