Compliance Management, Audit and Due Diligence · Due Diligence

Types of Due Diligence: Financial, Legal, Tax and More

Updated 11 October 2026 · Fact-checked

Due diligence is an investigation of a target before a deal or decision. Its types are named by the area examined: financial, legal, tax, commercial, operational and secretarial. To answer a question, match each fact in the case to its type, state what is checked, and name the risk it finds.

Understand Types of Due Diligence

Due diligence means a careful, structured check of a business, asset or transaction before you commit to it. A buyer, investor, lender or board does it to confirm what the seller says is true, and to find risks that affect price or terms.

The types are not separate laws. They are separate lenses. Each type asks a different question about the same target. The type is named by the area examined.

Financial due diligence: Are the numbers reliable? It reviews financial statements, quality of earnings, working capital, debt, contingent liabilities and related party dealings.
Legal due diligence: Does the target legally own what it claims, and is it free of legal trouble? It reviews title to assets, contracts, litigation, licences, charges and regulatory approvals.
Tax due diligence: Are tax positions sound? It reviews returns filed, assessments, pending disputes, indirect tax compliance and exposure that may pass to the buyer.
Commercial due diligence: Will the business keep earning? It reviews the market, customers, competitors, pricing and the growth assumptions behind the business plan.
Operational due diligence: Can the business actually deliver? It reviews plant, supply chain, systems, people, processes and capacity.
Secretarial due diligence: Has the company kept its corporate records and filings in order? It reviews statutory registers, minutes, resolutions, ROC filings, share capital history, board and general meeting compliance. This is the type a company secretary leads.

The types overlap. A pending tax notice is a tax issue, but it is also a legal and a financial one. In an answer, place the point under its main type and note the overlap briefly. Large deals often add other lenses such as environmental, HR or IT due diligence, but the six above are the core set.

Key rules to remember

Financial due diligence: Focus = reliability of numbers, earnings quality, debt and liabilities; Output is a view on value and price adjustments.
Legal due diligence: Focus = title, contracts, litigation, licences, charges; Output is a list of legal risks and conditions for the deal.
Tax due diligence: Focus = returns, assessments, disputes, indirect tax exposure; Output is the quantified tax exposure and protection sought, such as indemnity.
Commercial due diligence: Focus = market, customers, competition, business plan; Tests whether projected revenue is realistic.
Operational due diligence: Focus = plant, processes, supply chain, systems, people; Tests whether operations can support the plan.
Secretarial due diligence: Focus = statutory records, minutes, filings, share capital history, meeting compliance; Checks compliance with company law and secretarial standards.

How to solve Types of Due Diligence questions

Use this method for any question that asks you to identify, explain or apply types of due diligence.

1Read the facts and note the transaction, such as acquisition, investment or lending, and who is doing the diligence.
2Underline each issue in the facts: unpaid dues, missing minutes, disputed title, falling sales, ageing machinery.
3Map each issue to the type that mainly examines it.
4For each type, state in one line what is reviewed and the documents you would ask for.
5State the risk each finding creates and its effect on price, conditions or the decision to proceed.
6Mention overlaps where one issue touches two types.
7Close with a clear conclusion and recommendation, and the role of the company secretary where relevant.

Quickest way: Six-lens scan

When to use it: Use when time is short or the question asks you to list and differentiate types.

Write the six types as a list: financial, legal, tax, commercial, operational, secretarial.
Against each, write one question it answers, such as numbers reliable, title clean, tax exposure, market demand, delivery capacity, records in order.
Add two documents examined per type.
Tie the case facts to the right line.
End with one line on the risk found and the action to take.

Common mistakes in Types of Due Diligence

Treating all due diligence as financial checking only.
Students link due diligence with audit and accounts.
Fix: Always cover the non-financial lenses. Say that financial diligence tests numbers, while the others test law, markets, operations and records.
Mixing up legal and secretarial due diligence.
Both review documents and compliance.
Fix: Legal looks at rights, contracts, title and disputes. Secretarial looks at corporate records, registers, minutes and statutory filings.
Placing an issue under the wrong type.
Issues often overlap, and students pick by habit.
Fix: Choose the type whose main question the issue answers, then note the overlap in one line.
Listing types without applying them to the facts.
Memorised definitions feel safe.
Fix: Case-based papers reward analysis. Use the facts, state the risk and give a conclusion.
Confusing commercial and operational due diligence.
Both concern how the business runs.
Fix: Commercial looks outward at market and customers. Operational looks inward at capacity, processes and systems.
Stating specific section numbers or limits from memory.
Students try to add precision.
Fix: Cite a provision only when you are sure of it. Otherwise state the rule in plain words.

Worked examples

Example 1

Sharma Textiles Ltd, a Surat company, is being acquired by Kaveri Fabrics Ltd. The buyer finds that the target's last two years of board minutes are unsigned, a sales tax notice is pending, and its main customer has cut orders by half. Identify the types of due diligence that apply and the issue each reveals.

Show the solution

Transaction: acquisition. The buyer is the diligence party.
Unsigned minutes point to a record-keeping lapse. This is secretarial due diligence: check minute books, signing, resolutions and meeting compliance.
The pending notice is a tax issue. This is tax due diligence: review the notice, assessments and the likely liability. It also touches legal and financial diligence if a dispute or provision exists.
The fall in orders from the main customer concerns demand and concentration. This is commercial due diligence: test customer dependence and revenue forecasts.
Effect: the buyer may reduce price, seek an indemnity for the tax exposure, and make rectification of records a condition before closing.

Answer: Secretarial due diligence reveals the unsigned minutes, tax due diligence the pending notice, and commercial due diligence the loss of orders. The buyer should adjust price, seek an indemnity and require the records to be corrected.

Example 2

Distinguish financial due diligence from legal due diligence, and state the role of secretarial due diligence in a share purchase of a private company.

Show the solution

Financial due diligence: it examines financial statements, earnings quality, working capital, debt and contingent liabilities. Its aim is to confirm the numbers and support valuation.
Legal due diligence: it examines title to assets, contracts, litigation, licences and charges. Its aim is to confirm legal rights and find legal risk.
Difference: financial tests how reliable and valuable the numbers are. Legal tests whether the rights behind those assets are valid and free from claims.
Secretarial due diligence: in a share purchase, it checks statutory registers, share capital history, allotments and transfers, minutes and ROC filings.
Purpose: it confirms that the shares being sold were validly issued and held, and that the company has complied with company law and secretarial standards.
Conclusion: the three work together. The company secretary usually leads the secretarial review and reports gaps to the buyer.

Answer: Financial due diligence tests the reliability of numbers and value. Legal due diligence tests rights, contracts and disputes. Secretarial due diligence confirms valid share capital and sound corporate records in a share purchase.

Exam tips

Answer case questions in the order: type, what is checked, finding, risk, recommendation.
When asked to distinguish two types, use a short point-by-point comparison on focus, documents and output.
Name the company secretary's role in secretarial due diligence. It is a favourite angle.
Keep the six core types ready as a list, then add others only if the facts call for them.
Do not quote section numbers unless you are certain of them. Explain the rule in plain words.

Practice questions from Due Diligence

Types of Due Diligence in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Types of Due Diligence: frequently asked questions

What are the main types of due diligence?

The core types are financial, legal, tax, commercial, operational and secretarial. Each examines a different area of the target. Other lenses such as environmental or IT may be added for some deals.

What is the difference between financial and legal due diligence?

Financial due diligence checks the reliability of numbers, earnings and liabilities. Legal due diligence checks title, contracts, litigation and approvals. One tests value, the other tests rights and legal risk.

What is secretarial due diligence?

It is a review of a company's statutory registers, minutes, resolutions, share capital records and filings. It checks compliance with company law and secretarial standards. A company secretary usually leads it.

Who does due diligence?

The party relying on it commissions it, such as a buyer, investor or lender. Specialists carry out each type: accountants for financial and tax, lawyers for legal, company secretaries for secretarial, and consultants for commercial and operational.