Financial due diligence: 20 checkpoints for buying an SME in Switzerland (2026)

Are you buying an SME in Switzerland? Good. But if you sign based on a “nice” income statement without understanding what’s behind it, you’re flipping a coin with several hundred thousand francs.

Financial due diligence isn’t a report to please the bank. It’s a filter. It answers a simple question: do the numbers tell the same story as the seller?

Here, I offer 20 concrete checkpoints, the ones we use in practice on SME cases in Geneva, Vaud, and French-speaking Switzerland. No theory. Checks, documents, classic pitfalls, and a case with numbers.

Revenue quality: relevance, recurrence, seasonality, and client dependency

Everyone looks at revenue. The problem is, it’s often looked at incorrectly.

1) “Clean” revenue vs “inflated” revenue

First reflex: reconcile accounting revenue with:

• issued invoices (sales journals)
• receipts (bank statements)
• declared VAT (returns)

If you find recurring discrepancies, ask immediately. Beware: invoicing at year-end, collecting later, and presenting it as growth is a classic trap.

2) Recurrence: how much comes back “on its own” next year?

Separate:

• recurring (annual contracts, subscriptions, maintenance)
• project (one-shot)
• opportunistic (large isolated mandate)

Practically, two companies with CHF 3.5 million in revenue can have very different values.

3) Client concentration: the top 3 test

Request the client list and revenue per client over 3 years.

• If 1 client = 30% of revenue, you’re buying a relationship, not an SME.
• If the top 3 = 60%, you’re buying dependency.

In Geneva, this is common in B2B services (IT, facility, subcontracting in watchmaking in Jura/Neuchâtel, etc.). The seller will say “they’re loyal.” You must check contracts, durations, termination clauses.

4) Seasonality: does cash flow survive the trough?

Look at revenue month by month, not just annually.

• restaurants/events: obvious peaks and troughs
• construction: staged invoicing
• services: sometimes very linear… except when a big client pays late

Result? A company can be profitable over the year and still run out of cash in February.

5) Pricing and discounts: does margin hold without “gifts”?

Simple check:

• top 20 invoices: discounts, rebates, credits
• average price evolution per service/product
• discount policy: written or “gut feeling”?

When undocumented discounts appear, dig deeper. Often, it hides competitive pressure or a client dictating terms.

6) VAT: rate and base consistency

Since January 1, 2024, Swiss rates are:

• 8.1% (standard rate)
• 2.6% (reduced rate)
• 3.8% (special accommodation rate)

Your check:

• are sales at the correct rate?
• are cross-border services properly handled?
• are corrections (credit notes) properly recorded?

A rate error on significant volume ends in VAT recall + interest. The AFC doesn’t “negotiate” that.

Checklist #1 — Revenue quality (to request from seller)

• Detailed sales journals (3 years + current year)
• Client list with revenue per client (3 years)
• Framework contracts / maintenance contracts / subscriptions
• Top 50 invoices and top 50 credits
• VAT returns + reconciliation with accounting
• Monthly revenue analysis (at least 24 months)

Debt and hidden commitments analysis: financial debts, off-balance obligations, potential litigation

A failed acquisition is rarely “because revenue dropped.” It’s often because someone discovered a debt they hadn’t seen.

7) Financial debts: banks, shareholders, leasing

List everything:

• bank loans (terms, covenants, guarantees)
• shareholder loans (rates, maturities, subordination or not)
• leasing (vehicles, machines)

Attention: “informal” shareholder loans. In practice, SMEs where the shareholder “advanced” CHF 200,000 over years, no contract. On sale day, it suddenly becomes a payable debt. You see the issue.

8) Supplier debts: aging and dependency

Request supplier aging.

• debts > 90 days: why?
• strategic suppliers: payment terms, exclusivity, penalties

An SME can show decent cash simply by paying suppliers in 90 days while the sector is at 30.

9) Provisions: are they realistic?

Provisions are where “disturbing” items are stored.

• litigation
• client guarantees
• returns
• restructurings

Check: compare provisions with actual cost history. If a provision is stable for 3 years and never used, ask why.

10) Off-balance commitments: guarantees, warranties, leases

Look for:

• guarantees given to a bank
• performance bonds
• long-term lease contracts (commercial leases)
• mandatory maintenance contracts

In Geneva, a poorly drafted commercial lease can cost dearly. A “reasonable” rent today can explode at the next indexation or renewal.

11) Potential litigation: don’t settle for “there’s nothing”

Request:

• list of ongoing procedures
• lawyer correspondence (at least a summary)
• significant client claims

Field observation: many SMEs discover the real tension at year-end, when the auditor or accountant asks “what do we provision?” Before, everyone acts as if it doesn’t exist.

12) Commercial register check: who owns what, who signs?

Before discussing price, check:

• company identity
• directors / signatories
• capital, statutes, any restrictions

Useful source: (source: Zefix – Swiss commercial register (identity, shareholding, statutes check))

Working capital requirement: cash cycles, stock management, receivables and supplier debts

You can buy a profitable company… and need to inject cash from month one. Happens more often than you think.

13) Working capital: calculate it, then test it

Working capital is the gap between:

• what you pay (salaries, suppliers)
• and what you collect (clients)

Concrete check:

• DSO (days sales outstanding)
• DPO (days payable outstanding)
• stock turnover

If the seller says “our clients pay in 30 days,” check receipts. Invoices don’t lie, speeches do.

14) Client receivables: quality, litigation, collection

Request client aging and identify:

• receivables > 60 days
• receivables in dispute
• clients always paying late

Also check bad debts over 3 years. An SME with CHF 5,000 in annual losses isn’t the same as one with CHF 80,000.

15) Stocks: valuation, obsolescence, inventories

If the company has stock:

• valuation method (FIFO, average cost)
• physical inventories: frequency, discrepancies
• dormant stock: since when?

Classic trap: stock valued too high, obsolescence not provisioned. You pay for “paper.”

16) Social and tax debts: cash that leaves unexpectedly

Check:

• social charges: payments up to date?
• taxes: installments, recalls, ongoing decisions
• VAT: consistency and possible audits

A VAT or social debt isn’t discussed long. It gets paid.

Table #1 — Quick reading of working capital (typical Geneva SME services example)

Common red flags in due diligence: accounting anomalies, risky contracts, hidden tax issues

Here are signals that should make you slow down. Not to automatically cancel, but to renegotiate, secure, or structure differently.

17) “Gut feeling” accounting: manual entries and improvised closing

Red flags:

• many manual entries at year-end
• suspense accounts lingering
• personal expenses in the company (car, travel, etc.) without clear policy

Yes, it exists. And yes, it can be fixed. But you must quantify the impact.

18) “Adjusted” EBITDA: when it becomes fiction

A seller may present a “normalized” EBITDA by removing:

• an “too high” manager salary
• “exceptional” expenses
• “non-recurring” charges

Once is fine. Three times is suspicious.

Our view: accept adjustments only if you can prove them with documents and agree they won’t recur after the sale.

19) Risky contracts: dependency, penalties, termination

Checks:

• termination clauses (notice, reasons)
• change of control clauses (some terminate automatically)
• late penalties
• price indexations

In some sectors (IT, maintenance, facility), a change of control clause can terminate a major contract. Then your business plan collapses.

20) Hidden tax issues: VAT, tax, risk of reclassification

Red flags:

• VAT: inconsistent rates, poorly documented exports
• private expenses booked as charges
• inconsistent manager remuneration (risk of reclassification)

If the company has cross-border employees, also check payroll mechanics and declarations. Errors cost, often with interest.

Table #2 — Red flags and concrete actions

Step-by-step method (the one we apply to a Swiss SME)

Want a clear process? Here it is.

Step 1 — Define scope and “deal”

• share deal (buying shares) or asset deal (buying assets)
• scope: company only, subsidiaries, branches
• target date: closing and economic date

Legal matters here. The Swiss Code of Obligations sets the basics (source: fedlex.admin.ch – Swiss Code of Obligations (legal acquisition check)).

Step 2 — Request a solid data room

Minimum:

• annual accounts 3 years + detailed balance
• ledger, journals, key documents
• VAT, taxes, salaries
• major client/supplier contracts

If you get PDFs without detail, you’re blind.

Step 3 — Do “plain and simple” reconciliations

• Revenue vs VAT vs bank
• salaries vs AVS/LPP returns
• bank debts vs confirmations

Step 4 — Normalize performance

• isolate proven non-recurring charges
• recalculate an “exploitable” margin
• test sensitivity: loss of a client, salary increase, etc.

Step 5 — Work on working capital and net debt

• normalized working capital calculation
• net debt at economic date
• price adjustment mechanism (closing accounts or locked box)

Step 6 — List quantified risks

• VAT risk: X CHF
• litigation: Y CHF
• obsolete stock: Z CHF

And then: who pays if it happens? That’s where guarantees and indemnities come in (source: admin.ch – Federal practice on warranty for defects in transfer (CO law)).

Practical case (Geneva): when working capital changes the price by CHF 180,000

Geneva SME in technical services, 12 employees.

• Revenue 2025: CHF 3,200,000
• Presented EBITDA: CHF 420,000
• Discussed price: CHF 2,100,000 (based on multiple)

You do the due diligence.

What’s discovered

1. Client receivables: CHF 620,000, of which CHF 210,000 > 60 days.
2. Suppliers: CHF 190,000, average payment 45 days.
3. “Normal” working capital history (24-month average): CHF 230,000.
4. Working capital at economic date (snapshot 31.12): CHF 410,000.

Working capital gap: 410,000 - 230,000 = CHF 180,000.

What it changes in negotiation

If you buy without adjustment mechanism, you finance CHF 180,000 of “excess” tied-up cash.

Two clean options:

• Adjust the price by CHF 180,000 (closing accounts mechanism)
• Or impose a working capital clause: seller compensates if working capital exceeds normalized level

And we haven’t even discussed the CHF 210,000 aged receivables. Here, you request:

• detail of disputes
• collection history
• possibly a dedicated escrow

Documents we almost always require (otherwise, time is wasted)

Want to go fast? Request these from the start.

• Signed annual accounts + appendices (3 years)
• Detailed balance + ledger (current year included)
• Bank statements + reconciliations
• VAT returns (quarterly or semi-annual) + reconciliation
• Client/supplier list + aging
• Major contracts (clients, suppliers, lease, leasing)
• List of litigation, claims, guarantees
• Salary details, bonuses, social charges, LPP

Field observation: when an SME “drags” to provide these, it’s not always bad faith. Often, it’s just weak admin organization. But for you, buyer, the risk is the same: you sign without visibility.

7 common mistakes (and how to fix them)

Mistake 1 — Trusting revenue without cross-checking

Correction: revenue vs VAT vs bank reconciliation. Simple, radical.

Mistake 2 — Buying client dependency without the right price

Correction: concentration analysis + change of control clauses + earn-out if needed.

Mistake 3 — Forgetting working capital in the price

Correction: working capital clause or closing accounts. Otherwise, you pay twice.

Mistake 4 — Confusing EBITDA and cash

Correction: cash flow statement, working capital variation, real capex.

Mistake 5 — Underestimating VAT

Correction: rate review (8.1%, 2.6%, 3.8%), service qualification, export proof.

Mistake 6 — Letting a “vague” shareholder loan slip

Correction: written contract, subordination, or repayment before closing.

Mistake 7 — Signing overly vague guarantees

Correction: specific quantified guarantees + indemnity mechanism + adapted cap/duration.

Checklist #2 — 20 checkpoints (action version)

Tick, and don’t let go until it’s clear.

1. Accounting revenue reconciled with sales journals
2. Revenue reconciled with bank receipts
3. Revenue reconciled with declared VAT
4. Monthly revenue analysis (24–36 months)
5. Top clients + concentration (1st, top 3, top 10)
6. Recurring contracts: duration, termination, change of control
7. Pricing/discount policy + credit analysis
8. Gross margin per line (product/service) and evolution
9. Normalized EBITDA: adjustments proven by documents
10. “Personal” or non-operational charges identified
11. Client aging + historical bad debts
12. Reminder procedures and payment terms
13. Stocks: valuation method + obsolescence + inventories
14. Supplier aging + supplier dependency
15. Bank debts: confirmations + covenants + guarantees
16. Shareholder loans: contracts, maturities, subordination
17. Leasing and long-term commitments (leases, maintenance)
18. Provisions: consistency with actual risks
19. Litigation: list, amounts, probability, documents
20. Net debt and normalized working capital integrated into price mechanism

What the bank looks at (and what you should too)

Even if you finance without a bank, their checklist is useful:

• revenue and margin stability
• client dependency
• repayment capacity (cash, not EBITDA)
• quality of monthly reporting
• net debt level post-acquisition

If the company lacks reliable monthly reporting, you’ll build it after. Plan time and budget. Otherwise, you’re flying blind.

Share deal or asset deal: the financial impact many underestimate

Staying concrete.

• Share deal (buying shares): you take over the company with its history. So historical risks (VAT, litigation, hidden debts) follow you, unless contract protections.
• Asset deal (buying assets): you choose what you take over. Often cleaner, sometimes heavier to execute (contract transfers, employees, permits).

The choice depends on sector, licenses, contracts, and tax. But financially, the question is: which historical risks do I keep?

For M&A steps and issues in French-speaking Switzerland, see (source: Ark Fiduciaire – M&A in French-speaking Switzerland).

FAQ on financial due diligence in Switzerland: costs, tools, mistakes to avoid, available checklists

1) How much does financial due diligence cost for an SME in Switzerland?

For a “standard” SME (clean accounting, complete data room), the budget mainly depends on transaction volume and risk level. What drives up the bill isn’t size, it’s disorder: missing documents, impossible reconciliations, lost contracts.

2) How much time should you allow?

If the seller cooperates and data is ready, a serious financial review takes a few weeks. If analyses (working capital, margins, VAT) need to be rebuilt, it quickly extends.

3) What tools do you use in practice?

• accounting exports (ledger, balances)
• structured Excel analyses (working capital, net debt, margins)
• bank statement checks and reconciliations
• commercial register checks (source: Zefix – Swiss commercial register (identity, shareholding, statutes check))

The best tool is a seller who provides clean data. Without that, even the best software can’t work miracles.

4) What mistakes should you avoid when buying an SME?

The top three:

• paying a price without working capital/net debt mechanism
• accepting “adjusted” EBITDA without proof
• neglecting VAT and historical risks in share deals

5) Does due diligence replace contract guarantees?

No. Due diligence reduces the unknown, but doesn’t eliminate risk. Guarantees and indemnities are for when a problem arises after closing. For legal framework, see (source: admin.ch – Federal practice on warranty for defects in transfer (CO law)) and (source: fedlex.admin.ch – Swiss Code of Obligations (legal acquisition check)).

6) Do you have a ready-to-use checklist?

Yes: the Checklist #2 — 20 checkpoints above is made for this. Print it, use it in seller meetings, and note what’s missing. If you have 6 undocumented points out of 20, you already know the risk isn’t theoretical.

References

• fedlex.admin.ch – Swiss Code of Obligations (legal acquisition check)
• Zefix – Swiss commercial register (identity, shareholding, statutes check)
• Ark Fiduciaire – M&A in French-speaking Switzerland
• admin.ch – Federal practice on warranty for defects in transfer (CO law)