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

Are you buying an SME in Switzerland? Great. But if you sign based on a nice PowerPoint and two “clean” balance sheets, you’re playing roulette.

Financial due diligence isn’t an academic exercise. It’s triage: what’s solid, what’s dressed up (not necessarily fraudulent), and what will blow up in your face after the takeover.

Here are 20 concrete checks—the ones you actually do if you want to sleep well. With Swiss examples, classic pitfalls, and a step-by-step method.

Useful references (no links in this article): (source: Due Diligence – Definition and applications (official SECO)), (source: Transferring or acquiring a business (Swiss federal SME guide)), (source: Code of Obligations (CO)).

Step by step: how to conduct financial due diligence that actually matters

1) Frame the deal (and stop chasing useless documents)

Before requesting 300 files, clarify:

• Scope: standalone company, subsidiary, branch, isolated assets?
• Reference date: annual accounts + interim situation (usually the last closed month).
• Price mechanics: fixed price, or price adjusted for net debt / working capital?
• What you’re really buying: client base, inventory, team, contracts, brand, lease.

This changes everything. A “cash-free / debt-free” price without a clear debt definition is a recipe for disputes.

2) Get raw data (not just PDFs)

PDF accounts are good for show. To work, you need:

• Complete general ledger (GL) for 3 years
• Detailed trial balance
• VAT exports (returns, reconciliations)
• Sales/purchase exports (by client/supplier)
• List of fixed assets + depreciation
• Credit, leasing, guarantee contracts
• List of disputes and provisions

If you’re told “we don’t have that,” beware. An SME can be simple, but it always has a minimum of traceability.

3) Do a “risk” reading before a “value” reading

Start with what can cost you dearly:

• hidden debts
• VAT and social charges
• dependence on 2 clients
• overvalued inventory
• cash not coming in

Valuation comes after. Otherwise, you risk discussing a multiple on a result that doesn’t exist.

4) Normalize EBITDA (without fooling yourself)

Adjust the result to isolate:

• non-recurring expenses (truly non-recurring)
• owner’s remuneration (too low or too high)
• “friendly” rents (lease below market)
• personal expenses booked as business costs

Classic trap: you’re sold 10 “one-off” adjustments… that recur every year.

5) Draw up a list of negotiation points

Useful due diligence ends with:

• price adjustments (net debt, working capital, inventory)
• guarantees (VAT, disputes, social charges)
• conditions (lease renewal, retention of key clients)
• price holdback / escrow if risks are identified

And quantify. Otherwise, it’s just talk.

Revenue quality: analysis, reliability, and trends

Revenue is the first area for unintentional dressing up. Not necessarily fraud. Just “rough” closing habits.

Check 1 — Reconciliation of accounting sales vs VAT

In Switzerland, VAT is an excellent reality detector.

• Compare accounting revenue with VAT-declared revenue.
• Explain every difference: exports, out-of-scope services, corrections, credit notes.

If the gap is recurring and poorly explained, you have a cut-off or classification problem.

Reminder of rates (since January 1, 2024): 8.1%, 2.6%, 3.8% (accommodation).

Check 2 — Cut-off: year-end invoices and ongoing services

Simple question: “Are December sales really in December?”

Test:

• last invoices issued before closing
• first invoices after closing
• delivery notes / intervention reports

In practice, many Geneva SMEs discover this at closing: they invoice in January for services performed in December “because it’s easier.” Result? The year’s revenue is underestimated, then overestimated the following year. For you, the buyer, this distorts the trend.

Check 3 — Client concentration and commercial dependence

You want to know if the company survives thanks to 2 clients.

• Top 10 clients over 3 years
• Share of client #1 and #2
• Evolution of volumes and margins

In Geneva, many B2B SMEs depend on a single ordering party (watchmaking, luxury, subcontracting). If this client changes purchasing policy, your business plan collapses.

Check 4 — Contract quality: recurrence, indexation, termination

Ask for the contracts. Not a summary.

• duration and renewal
• termination clauses
• indexation (inflation, material costs)
• penalties, SLAs

A company may show “recurring” revenue… with contracts terminable in 30 days. That’s not the same value.

Check 5 — Discount policy, credit notes, and returns

Look at:

• credit note rate (amount / revenue)
• returns and exceptional discounts
• client disputes

A rising credit note rate is often a signal of declining product/service quality or commercial pressure.

Check 6 — Margin analysis by line (not just overall margin)

A stable gross margin can hide:

• a profitable activity declining
• an unprofitable activity rising

Segment by:

• product / service
• client
• channel
• site (Geneva vs Vaud, for example)

If analytical accounting doesn’t exist, reconstruct with sales/purchase exports. It’s work, but avoids buying a low-margin machine.

Table 1 — Quick tests on revenue (what you want to see)

Hidden debts and commitments: essential checks

This is where nasty surprises hide. And they’re expensive, because they come out after signing.

Check 7 — Financial debts: banks, shareholder loans, covenants

Ask for:

• credit contracts
• amortization tables
• conditions (covenants, ratios)
• guarantees (pledges, assignments)

Classic: an “informal” shareholder loan becomes due upon change of control. If it’s not written, clarify in writing.

Check 8 — Leasing and off-balance sheet commitments

Leasings (vehicles, machines) are often underestimated.

• list of contracts
• remaining duration
• buyback value
• exit penalties

Buying an SME with 6 vehicles on lease? Fine. But if you have to take them over and the fleet is oversized, it drains cash.

Check 9 — Supplier debts and invoices not yet received

Check:

• supplier balance
• invoices received after closing
• accrued expenses

Classic trap: “we haven’t received the invoice, so we don’t book it.” But the expense exists.

Check 10 — Social charges and salaries: the silent risk

In Switzerland, AVS/LPP/LAA adjustments come quickly.

• salary reconciliation accounting vs returns
• LPP certificates (pension fund)
• LAA/LAC premiums
• vacation and overtime to provision

Field observation: some SMEs never provision unused vacation. As long as the owner is there, it’s fine. When you take over and the team wants to “recover,” the bill arrives.

Check 11 — VAT: rates, exemptions, corrections, risk of reassessment

VAT is a minefield if the company mixes:

• services in Switzerland and abroad
• rates 8.1% and 2.6%
• re-invoicing, disbursements, mixed services

Check:

• consistency of applied rates
• export documentation
• input tax corrections
• past VAT audits and correspondence

A VAT reassessment isn’t just VAT. There are also interest and sometimes lengthy discussions.

Check 12 — Disputes, provisions, and client guarantees

Ask for the list of disputes, even “small” ones.

• ongoing proceedings
• client claims
• product guarantees
• contractual penalties

If the company never has disputes “because we arrange things,” beware. Usually, nothing is documented.

Table 2 — Debts and commitments: where they hide

Working capital, cash, and cash flow

You can buy a profitable company… that never has cash. Then you’re the one financing.

Check 13 — Working capital analysis: clients, inventory, suppliers

Calculate and track over 24–36 months:

• DSO (days sales outstanding)
• DIO (days inventory outstanding)
• DPO (days payable outstanding)

A rising DSO is often a collection or invoicing quality problem.

Check 14 — Aging of receivables and bad debts

Ask for aging:

• 0–30 days
• 31–60
• 61–90

• 90

Then:

• provisioning policy
• loss history
• major dispute files

If 20% of receivables are over 90 days and the provision is minimal, you’ll pay twice: once at purchase price, once in losses.

Check 15 — Inventory: valuation, obsolescence, physical counts

Inventory is a perfect place to embellish a balance sheet.

Check:

• valuation method (average cost, FIFO)
• physical inventories (dates, signatures)
• obsolescence (turnover, dormant items)
• real margin on liquidation

If the company has an ERP (Odoo or other), extract movements. Otherwise, use Excel and cross-check with purchases/sales. Less elegant, but it works.

(source: Sales, purchase, and inventory control module in Odoo)

Check 16 — Cash flow: from result to cash (reconciliation)

The result can be good and cash bad.

Reconstruct:

• EBITDA
• working capital variation
• investments (CAPEX)
• debt repayments

Check consistency: an SME claiming “strong growth” but with deteriorating cash and no financing signals uncontrolled growth.

Check 17 — Cash: bank statements, reconciliations, restrictions

Ask for:

• bank statements over 12 months
• bank reconciliations
• blocked accounts / pledges

Trap: displayed cash, but actually pledged or offset by the bank.

Practical case (Geneva): what a misunderstood working capital changes

Geneva technical services SME (LLC), 12 employees. You negotiate a price based on a “normalized” EBITDA of CHF 420,000.

You look at working capital:

• Client receivables: CHF 980,000
• Supplier debts: CHF 410,000
• Accrued expenses: CHF 120,000
• Inventory: CHF 0 (services)

Working capital = Receivables + Inventory – Suppliers – Accrued expenses

Working capital = 980,000 + 0 – 410,000 – 120,000 = CHF 450,000

Compare to history: “normal” working capital over 3 years was CHF 260,000. Now, there’s CHF 190,000 excess working capital.

Why?

• DSO went from 52 days to 78 days (late invoicing + weak collection)
• A large public client pays in 60–90 days, and the company took this client without adapting its cash

Consequence for you:

• If the deal includes a price adjustment for working capital, you negotiate -CHF 190,000.
• If the deal is fixed price, you finance CHF 190,000 of cash from day one.

Many buyers are shocked. “But the company is profitable!” Yes. And it consumes cash.

Red flags: warning signs not to ignore

Here are the most common ones. Not theory—real experience.

Red flag 1 — Accounting done “by feel” and late closing

If annual accounts are finalized 8–10 months after year-end, it’s rarely a good sign.

• lack of management
• late corrections
• dependence on one person

Red flag 2 — One-man band (and no one else knows how)

The owner does:

• invoicing
• payments
• bank relations
• salaries

You take over? You inherit huge operational risk. Secure with procedures, delegation, and sometimes a contractual transition period.

Red flag 3 — Margins sustained “thanks” to year-end entries

When margin only improves at closing via:

• questionable expense capitalization
• reduced provisions
• inventory rising without reason

… dig deeper. Immediately.

Red flag 4 — VAT and salaries: areas where checks hurt

An SME can survive a bad sales month. A VAT reassessment or heavy social adjustment is another story.

Red flag 5 — Growth too fast without structure

Revenue +30% but:

• DSO explodes
• client complaints
• employee turnover

Growth is good. Unfinanced growth is a trap.

20 key checks (actionable list, no poetry)

Here’s the full checklist. If you do 12 out of 20, you’ll already avoid most disasters.

1. Reconciliation of accounting revenue vs VAT
2. Sales cut-off (year-end / month-end)
3. Client concentration (top 10)
4. Contract analysis (duration, termination, indexation)
5. Credit notes and client disputes
6. Margins by segment (client/product)
7. Financial debts + covenants
8. Shareholder loans (due, clauses)
9. Leasing and off-balance sheet commitments
10. Supplier debts + invoices not yet received
11. Social charges (AVS/LPP/LAA) + vacation provisions
12. VAT: rates, exemptions, input tax
13. Dispute provisions / guarantees
14. Historical working capital and seasonality
15. Client aging + provisioning policy
16. Inventory: physical count, obsolescence, valuation
17. Cash flow: reconciliation result → cash
18. Bank reconciliations + restrictions
19. Fixed assets: existence, depreciation, upcoming CAPEX
20. Related parties: rents, services, re-invoicing

Checklist #1 — Documents to demand before “discussing price”

• Annual accounts for 3 years (balance sheet, income statement, notes)
• Detailed trial balance + general ledger for 3 years
• Recent interim situation (monthly or quarterly)
• VAT returns + reconciliation with accounting
• Sales export (by client) + purchase export (by supplier)
• Client aging + list of provisions
• Supplier balance + list of invoices not yet received
• List of fixed assets + depreciation
• Contracts: credits, leasing, lease, major client contracts
• Salary returns + LPP/LAA certificates
• List of disputes, guarantees, commitments

If you get 30% of this and are told “trust us,” you already know what it’s worth.

Related parties and “small arrangements”: real cleanup before takeover

In SMEs, there’s often:

• rent paid to the owner’s real estate company
• a “company” car used privately
• generous representation expenses
• re-invoicing between group companies

Not necessarily illegal. But you must know what disappears after the sale and what needs replacing.

Concrete check — Review of sensitive accounts

Go through:

• vehicle expenses
• meal / representation expenses
• “consulting” fees
• phone charges
• rents

And ask: “Who benefits? Does it continue after the sale?”

Common mistakes (and how to fix them)

Mistake 1 — Believing the balance sheet tells all

Symptom: you look at bank debt and think you’re done.

Fix: add leasing, invoices not yet received, social charges to regularize, disputes. Debt isn’t just a 2xxx account.

Mistake 2 — Accepting a “normalized” EBITDA without proof

Symptom: 12 adjustments, no supporting documents.

Fix: every adjustment must have a document (invoice, contract, entry). And check if it recurs next year.

Mistake 3 — Forgetting working capital in negotiations

Symptom: fixed price, no adjustment mechanism.

Fix: define a target working capital based on history, and adjust at closing. Otherwise, you finance the drift.

Mistake 4 — Underestimating VAT

Symptom: “we’ve always done it this way.”

Fix: reconcile VAT vs accounting, check rates 8.1% / 2.6% / 3.8%, export documentation, input tax. And get a seller guarantee.

Mistake 5 — Not testing receivable quality

Symptom: large client balance, weak provisions.

Fix: aging, review files >90 days, client confirmation if needed, price adjustment or holdback.

Mistake 6 — Discovering after the fact that the lease is an issue

Symptom: commercial lease is in seller’s name, or renewal uncertain.

Fix: get landlord’s agreement before signing, or a suspensive condition. In Geneva, a location can be 50% of real value.

“CO” section: what the law requires for accounting (and why it helps you)

The Code of Obligations sets rules for keeping and presenting accounts. You’re not buying a theory; you’re buying a company that must produce understandable accounts.

Practical points:

• existence of accounting and supporting documents
• principles of prudence and regularity
• notes and minimum information depending on size

If documentation is weak, it’s not just “less comfortable.” It increases your risk of paying for numbers impossible to defend.

(source: Code of Obligations (CO))

How to turn findings into contract clauses (otherwise it’s useless)

Due diligence without contractual translation is a report that ends up in a drawer.

1) Price adjustment (net debt / working capital)

• Define debt precisely (include leasing? shareholder loans?)
• Define cash precisely (blocked accounts?)
• Define target working capital (historical average, seasonality)

2) Targeted seller guarantees

Examples:

• VAT: rate and declaration compliance
• social charges: no arrears
• disputes: exhaustive list + coverage above a threshold

3) Price holdback / escrow

When a risk is probable but not fully quantifiable (dispute, ongoing VAT audit), a holdback is often the cleanest solution.

4) Suspensive conditions

• lease renewal
• retention of a major client contract
• obtaining bank financing

Checklist #2 — Your “go/no-go” in 30 minutes

• Is revenue consistent with VAT and contracts?
• Is the top 3 clients stable and documented?
• Are margins sustained without dubious closing entries?
• Is working capital under control (reasonable DSO, no bad receivables)?
• Are off-balance sheet debts (leasing, accrued expenses) integrated?
• VAT and social charges: no major gray area?
• Does the seller accept targeted guarantees and an adjustment mechanism?

If you check “no” on 3 points, you either have major work to secure, a good reason to review the price, or to walk away.

FAQ on financial due diligence for Swiss SMEs (2026)

1) How much time should you allow for serious financial due diligence?

For a “clean” SME with available data: usually 2 to 4 weeks between collection, analysis, and Q&A. If accounting is disorganized, it can double.

2) Can you do due diligence without access to the general ledger?

You can, but you’re flying blind. Without the general ledger, you can’t properly test closing entries, sensitive accounts, provisions. In our opinion, it’s a bad bet.

3) Which items generate the most nasty surprises in Switzerland?

VAT, social charges (AVS/LPP), overvalued client receivables, obsolete inventory, unintegrated leasing, and related parties (rent, private expenses).

4) How to treat owner’s remuneration in EBITDA?

Reset it to “market” level for the real position. If the owner pays himself CHF 60,000 but does a full-time director’s job, your EBITDA is artificially inflated. If he pays himself CHF 250,000 and a replacement would cost less, adjust the other way.

5) What if the seller refuses a price adjustment for working capital?

You have three options: (1) lower the fixed price to include the risk, (2) demand a price holdback, (3) walk away. Buying a working capital drift without protection often means you’ll have to inject cash from the start.

6) VAT: which rates should appear in analyses in 2026?

The rates in force to use in your checks are 8.1% (standard), 2.6% (reduced), and 3.8% (accommodation). If you see inconsistent settings, dig deeper.

(source: Due Diligence – Definition and applications (official SECO))

If you want a pragmatic approach: start by securing VAT, social charges, working capital, and off-balance sheet debts. That’s where losses hide. The rest is price discussion.

References

• Transferring or acquiring a business (Swiss federal SME guide)
• Due Diligence – Definition and applications (official SECO)
• Code of Obligations (CO)
• Sales, purchase, and inventory control module in Odoo