Financial due diligence: 20 essential checks before buying an SME in Switzerland (2026)

Are you buying an SME in Switzerland? Good. But if you sign based on a "nice balance sheet" and two Excel tables from the seller, you're playing roulette.

Financial due diligence is not an academic exercise. It's a technical inspection, like when you buy a building: you want to know what holds up... and what will fall on you after the keys are handed over.

To be clear: the goal is not to "find faults." The goal is to pay the right price, lock in guarantees, and avoid unpleasant surprises (VAT, hidden debts, underestimated working capital, disputes, client dependency, etc.).

Definition source (useful for framing terms): (source: Official definition due diligence — Wikipedia)

Why is financial due diligence crucial before any acquisition of a Swiss SME?

In Geneva, we often see the same scenario: an SME runs "correctly," the seller is in a hurry, the buyer wants to move fast, the bank requests a file, and everyone reassures themselves with an EBITDA. Result? The real issues are discovered at the next closing.

Financial due diligence answers 4 very concrete questions:

1. Is the revenue real and sustainable?
2. Is the result reproducible or artificially boosted?
3. What debts and commitments are not obvious?
4. How much cash will need to be injected after the takeover to keep the business running?

And behind these questions, there are decisions:

• Adjust the price (or structure: earn-out, vendor loan, escrow)
• Set a closing accounts mechanism (target working capital, net debt)
• Require guarantees and indemnities on identified risks
• Prepare bank financing with defensible figures

What financial due diligence really changes in a negotiation

On the ground, serious due diligence changes the discussion from "I think" to "here are the documents." And that cools things down.

Typical examples:

• A seller announces 1.2 MCHF EBITDA. After adjustments (family salaries, non-recurring expenses, underprovisioning), it drops to 850 kCHF.
• The "normal" working capital is not 200 kCHF as presented, but 650 kCHF because stocks are too high and clients pay in 75 days.
• A VAT debt is not accounted for because "we'll regularize later." Spoiler: you will regularize.

The 20 essential checks (checklist #1)

Here is a simple checklist, used in practice to frame a mission. You can use it as is.

Revenue (1–6)

1. Reconciliation of accounting revenue ↔ invoicing ↔ receipts
2. Sales cut-off (year-end, ongoing services)
3. Client concentration (top 5 / top 10)
4. Recurrence vs one-shots (projects, bonuses, catch-ups)
5. Discount, credit, return policy
6. Framework contracts: indexation, termination, penalties

Margin and expenses (7–10) 7. Gross margin per line (products/services) and anomalies 8. "Personal" or non-operational expenses (cars, travel, rent) 9. Executive salaries: market level vs reality 10. Provisions (vacation, bonuses, disputes) and consistency

Working capital / cash (11–14) 11. Age of receivables (DSO) and bad debts 12. Stocks: turnover, obsolescence, valuation 13. Supplier debts: DPO, delays, dependency 14. Real cash: bank reconciliations, restrictions, blocked accounts

Debts and commitments (15–18) 15. Bank debts: covenants, change of control clauses 16. Leasing / long-term rental (off economic balance sheet) 17. Disputes, guarantees given, sureties 18. Taxation: direct taxes, VAT (rates 8.1% / 2.6% / 3.8%), potential reminders

Account quality (19–20) 19. Consistency balance sheet ↔ income statement ↔ notes ↔ general ledger 20. Reporting quality: monthly, cut-off, inventories, internal controls

Revenue quality: key controls (recurrence, cut-off, dependency, seasonality)

Revenue is the first area for makeup. Not necessarily fraud. Often "house habit": invoice when possible, record when convenient, regularize later.

Recurrence: what really returns... and what won't

You want to buy a capacity to generate cash, not a stroke of luck.

Concrete controls:

• Break down revenue: subscriptions, annual contracts, maintenance, projects, one-off sales.
• Identify one-shots: exceptional big project, compensation, asset sale, invoicing catch-up.
• Compare 36 months (not just 12): recurrence is seen in stability.

Field observation: many Geneva SMEs "inflate" year N because a big client advanced an order or paid a catch-up. Year N+1, the hole appears. And then, you're at the wheel.

Cut-off: the classic year-end trap

Cut-off is simple: record at the right time. That's where surprises hide.

To check:

• Invoices issued end of December: service delivered? accepted? signed?
• Ongoing services: recognition method (progress, milestones)
• Credits in January/February: often correct overly optimistic December sales

Quick test: take the 20 largest invoices from the last 30 days of the year, and ask for proof of delivery / acceptance / timesheets.

Client dependency: "if this client leaves, what's left?"

An SME with 35% of revenue from one client is hard to finance and sells well... only on paper.

Indicators:

• Share of top 1, top 3, top 10
• Relationship duration and volume stability
• Termination and change of control clauses

In our opinion, above 25% on one client, you must address it in the price and contract (earn-out, maintenance guarantee, or suspensive condition).

Seasonality: don't get trapped by a "good month"

Some sectors in Geneva and French-speaking Switzerland are very seasonal (events, certain retail, tourism-related activities, etc.).

Concrete control:

• Monthly revenue over 3 years
• Monthly margin (not just revenue)
• Cash needs during seasonal lows

Analysis of debts and hidden commitments: bank, tax, off-balance sheet (leasing, disputes, guarantees)

The balance sheet shows debts. But it doesn't always show commitments. And that's often where it hurts.

Bank debts: covenants and change of control clauses

You can take over a profitable company... and trigger early repayment because the bank didn't approve the change in shareholding.

To request:

• Credit contracts and annexes
• List of covenants (ratios, reporting, restrictions)
• "Change of control" clauses
• Pledges, assignment of receivables, guarantees

Tax and VAT: the discreet risk

VAT is a minefield when the SME has grown fast or mixes several types of services.

Control points:

• VAT registration: date, method (actual vs net tax liability rate if applicable)
• Applied rates: 8.1% (standard), 2.6% (reduced), 3.8% (accommodation)
• Supporting documents: invoices, exports, exemptions, proof of transport
• VAT returns: consistency with accounting revenue

Beware, classic trap: mixed services invoiced at the wrong rate, or invoices without VAT "because the client is abroad" without sufficient proof.

Off economic balance sheet: leasing, rents, long-term contracts

Accounting-wise, some commitments are not always visible as classic debt. Economically, they bind you.

To analyze:

• Vehicle/machine leasing: remaining term, buyback value, penalties
• Commercial leases: indexation, charges, tenant works
• IT contracts: licenses, maintenance, guaranteed minimums

Disputes, guarantees, sureties: liabilities that emerge late

Request:

• List of disputes (clients, suppliers, employees)
• Lawyer letters, settlement agreements
• Guarantees given on projects/sites
• Seller sureties: do you take over? are they released?

Managing working capital (WC) and post-acquisition cash

Working capital is what makes a takeover fail even if "profitable." You buy a company, pay the price, and then... you have to finance stocks and client payment terms.

WC: the formula, but above all the reality

WC (simple version) = Client receivables + Stocks – Supplier debts.

But the real question: what is the normal WC for this SME, in steady state?

To do:

• Calculate monthly WC over 24–36 months
• Identify peaks (seasonality, big projects)
• Remove exceptional items (large unpaid, exceptional stock)

DSO, DPO, stock turnover: three numbers that speak cash

• DSO (days sales outstanding): if it goes from 45 to 70 days, your cash melts.
• DPO (days payable outstanding): if the SME "survives" by paying in 90 days when terms are 30, you inherit a relational bomb.
• Stock turnover: old stock = immobilized cash + obsolescence risk.

Checklist #2 — What you must demand to secure post-closing cash

• A net debt / cash mechanism at closing (not a blind fixed price)
• A WC target defined over a representative period
• A contradictory stock inventory close to closing
• A receivables statement with aging and comments on disputes
• A purchase/sale cut-off at closing (otherwise, you pay twice)

Classic red flags and risk situations (overvaluation, hidden liabilities, client/supplier contracts, VAT anomalies, provisions, etc.)

You can debate for hours. On the ground, certain signals always come up.

8 red flags that deserve a stop (or a big discount)

1. Accounting done "when there's time": no monthly closing, no cut-off.
2. One client keeps the company alive and the contract is terminable in 30 days.
3. Unstable gross margin without explanation (purchase price, discounts, stock errors).
4. Old receivables: invoices at 180 days "but it'll come in".
5. Stocks without reliable inventory or valued "by feel".
6. Inconsistent VAT: accounting revenue ≠ VAT returns, rates misapplied (8.1% / 2.6% / 3.8%).
7. Too low provisions: vacation, bonuses, disputes, guarantees.
8. Owner dependency: he signs everything, sells everything, knows everything. What are you really buying?

Overvaluation: the "adjusted" EBITDA that becomes fiction

The seller gives you a "normalized" EBITDA. Fine. But normalized by whom?

Frequent adjustments:

• Personal expenses (car, phone, travel)
• Family salaries not justified by real function
• Underestimated rent (premises owned by seller)
• Deferred expenses (maintenance, IT, insurance)

It's not illegal. But if you pay on inflated EBITDA, you overpay.

Financial due diligence report: recommendations, concrete examples, essential documentation

A good report is not 80 pages of jargon. It's a document that helps you decide and negotiate.

What is expected from a useful report (simple structure)

• Executive summary: 1–2 pages, blocking points, price adjustments, conditions.
• Quality of earnings (QoE): adjusted EBITDA, non-recurring items.
• WC: normal level, seasonality, target at closing.
• Net debt: financial debts, cash, similar items.
• Risks: VAT, tax, disputes, off-balance sheet commitments.
• Annexes: list of documents, tests performed, reconciliation tables.

Table 1 — Documents to demand (and why)

Table 2 — Examples of typical adjustments (QoE)

Field anecdote (Geneva): the suspense account that hides everything

We regularly see a "suspense account" at 150 kCHF or 300 kCHF lingering for months. The seller says: "just entries to be made." Yes... but which ones?

When you open the details, you sometimes find:

• unrecorded supplier invoices
• forgotten client credit notes
• pending VAT adjustments

And then, your net debt explodes.

Step by step: how to conduct financial due diligence without losing 6 months

You want to move fast, but properly. Here’s a method that works.

Step 1 — Frame the deal (1 to 3 days)

• Scope: single company? group? branches?
• Target closing date
• Price mechanism: locked box or closing accounts
• List of documents (data room)

Step 2 — Collect and clean data (1 to 2 weeks)

• Accounting export (general ledger, balance)
• 3 years financial statements + recent interim
• VAT, salaries, contracts, debts

First sorting: what's missing, what's inconsistent, what needs an interview.

Step 3 — Targeted tests (2 to 4 weeks)

• Revenue tests (reconciliation, cut-off, contracts)
• WC tests (aging, stock, suppliers)
• Net debt and commitments
• QoE adjustments

Step 4 — Reporting and negotiation (a few days)

• List of red flags
• Quantified adjustments
• Contractual recommendations (guarantees, escrow, conditions)

Step 5 — Closing: lock in the numbers

• Closing accounts or locked box: consistency with what was analyzed
• Stock inventory
• Cut-off
• Bank confirmation

Practical case (CHF): takeover of a service SME in Geneva

Situation (realistic):

• B2B service SME in Geneva, 12 employees
• Revenue 2025: 4,800,000 CHF
• EBITDA announced by seller: 720,000 CHF
• Asking price: 3,600,000 CHF (5x EBITDA)

What due diligence reveals

1. Non-operational expenses (car + private expenses + subscriptions): 60,000 CHF/year
2. Insufficient vacation/bonus provisions: 85,000 CHF (net debt impact)
3. Doubtful receivables: 110,000 CHF >120 days, realistic provision 70,000 CHF
4. Cut-off: 95,000 CHF invoiced in December, service delivered in January → to reclassify
5. Normal WC: 620,000 CHF, while seller claims 300,000 CHF

Adjusted EBITDA (QoE)

• Announced EBITDA: 720,000
• • non-operational expenses: +60,000
• • cut-off (margin on 95,000 deferred): -40,000 (assumed margin 42%)
• • receivable provision (result impact): -70,000

Adjusted EBITDA: 670,000 CHF

Impact on price and structure

If keeping a 5x multiple:

• Value on announced EBITDA: 3,600,000
• Value on adjusted EBITDA: 3,350,000

Difference: 250,000 CHF.

And that's not all: net debt increases (provisions) and WC target changes.

Typical recommendation:

• Lower price by 250,000 CHF or put 250,000 CHF in escrow for 18 months
• Set a WC target at 620,000 CHF at closing (adjustment if lower)
• Specific guarantee on VAT and disputed receivables

You get the idea: it's not "theoretical." It's cash.

Common mistakes (and how to fix them without fooling yourself)

Mistake 1 — Settling for annual accounts

Problem: annual accounts smooth out and sometimes hide tensions.

Correction: demand a recent interim (monthly) and test the last 3 months in detail.

Mistake 2 — Forgetting WC in the price

Problem: you pay the value, then finance WC on top.

Correction: price mechanism with WC target + net debt.

Mistake 3 — Believing "VAT is OK" because the SME has a VAT number

Problem: a VAT number proves nothing about compliance.

Correction: revenue ↔ VAT returns reconciliation, rate control (8.1% / 2.6% / 3.8%), invoice tests.

Mistake 4 — Not reading bank contracts

Problem: change of control, covenants, guarantees: can block the deal.

Correction: contract review + bank validation before signing.

Mistake 5 — Underestimating owner dependency

Problem: seller leaves, and half the business leaves with him.

Correction: transition plan, non-compete clauses, earn-out conditioned on client retention.

Compliance points increasingly relevant in 2026 (transparency, register, documentation)

Much is said about transparency of legal entities and increased requirements. In an acquisition, this means more documentation and traceability requests.

• Obligations and trends on transparency: (source: Law on transparency of legal entities: new obligations)
• Announced developments around AML/Transparency frameworks: (source: Money Laundering Act and Transparency Act (AML, LTPM) 2026)

Concretely, your acquisition file must be clean: beneficial owners, governing bodies, documentation, and information consistency.

What your banker will look at (and what he won't always tell you)

The banker doesn't finance a "story." He finances repayment capacity.

He will look at:

• Adjusted EBITDA (not the brochure one)
• Available cash flow after taxes and investments
• WC and seasonality
• Client concentration
• Reporting quality

If your due diligence produces defensible numbers, you save time and avoid unnecessary back-and-forth.

Essential documentation to keep handy (and annex to the SPA)

The purchase contract (SPA) must rely on solid annexes. Otherwise, your guarantees are just paper.

Typically to annex:

• Financial statements and reference interim situation
• Net debt details (banks, leasing, shareholder debts)
• WC details (receivables, stocks, suppliers) and calculation method
• List of disputes and provisions
• List of major contracts
• VAT returns and reconciliation

For general legal framing when buying a company, see: (source: Legal framing and obligations when buying a company (contracts and balance sheets) — Fedlex)

Swiss SME financial due diligence FAQ (definitions, PDF templates, tools, banker’s role, costs, available training…)

1) What exactly is financial due diligence?

It's a structured review of a company's figures (result, cash, WC, debt, risks) to check their reliability and measure what you're really buying. General definition: (source: Official definition due diligence — Wikipedia)

2) How long does it take for a Swiss SME?

If the seller cooperates and accounting is properly kept: usually 3 to 6 weeks for an SME. If the data room is incomplete or accounting is "handmade," it can double.

3) How much does it cost?

Depends on data volume, test level, and sector (stock, projects, complex VAT). The real cost is mainly that of a bad acquisition. Due diligence is scalable: you can do a targeted review (major risks) or a full review.

4) Is there a PDF report template?

Yes, there are standard structures (executive summary, QoE, WC, net debt, risks, annexes). But a "template" doesn't replace tests and documents. A useful report is quantified, documented, and negotiation-oriented.

5) What tools do you use in practice?

Nothing magical: accounting exports (general ledger, balance), Excel/BI analyses, sample invoice tests, bank reconciliations, client/supplier aging, and above all targeted interviews (management, finance, sales).

6) What is the banker’s role during due diligence?

He challenges repayment capacity and financing structure. If you arrive with credible adjusted EBITDA, clear WC target, and clean net debt, the discussion changes. The banker doesn't do your due diligence for you.

References

• Official definition due diligence — Wikipedia
• Money Laundering Act and Transparency Act (AML, LTPM) 2026
• OFRC Communication 2/26 – audit checks and capital increase
• Law on transparency of legal entities: new obligations
• Legal framing and obligations when buying a company (contracts and balance sheets) — Fedlex