Why a poorly managed dispute costs more than the invoice
In Swiss SMEs, supplier invoices often represent the most significant expense after personnel costs. A dispute — for incorrect amount, non-compliant service, double billing, or failure to match the order — is not a simple administrative disagreement: it can block month-end closing, alter deductible VAT, and generate default interest if payment is suspended without a documented process.
The Code of Obligations (CO) governs purchase and service relationships between businesses, but does not provide a «single form» for disputing an invoice. It is up to the SME to define a clear internal workflow, aligned with the contract and Swiss accounting standards (GAAP/FER), that separates what is objectively disputable from what must be paid within the agreed terms.
This guide describes a replicable operational process for entrepreneurs, administrative managers, and trustees: from invoice receipt to accounting registration of the open item, through to resolution or legal escalation.
The most common disputes in B2B relationships
Before suspending a payment, it is essential to classify the reason for the dispute. In practice, Swiss SMEs mainly face these situations:
Formal and administrative errors
Amount different from the accepted quote, VAT calculated at the wrong rate, missing order reference, duplicate invoice compared to an advance payment already settled, or incomplete identification data for VAT deduction (VAT number, tax period).
Non-compliant service
Defective goods, partial delivery, service not performed as specified, or quantity discrepancy compared to the delivery document. In these cases, the right to price reduction or contract termination derives from Arts. 197 ff. CO for purchase and Arts. 368 ff. CO for contract for work.
Contractual disagreements
Unforeseen penalties, payment terms different from those agreed (e.g., net 30 vs. net 10), unauthorized ancillary items (shipping charges, additional hours), or application of updated price lists without prior notice.
Disputes on advances and balances
Closing invoices that do not deduct advances paid, or final balance disputed after a milestone project. These require comparison between the contract, progress reports, and bank transactions already recorded.
Structured workflow in five phases
A uniform process reduces the risk of double payments, loss of limitation periods, and inconsistencies between accounting and treasury. Here is a model suitable for SMEs with 5–50 employees:
- 1
Receipt and three-way matching
When the invoice arrives (paper, PDF, or e-invoice), verify matching between the purchase order, delivery document, and the invoice itself. In Accountex or an equivalent system, the invoice should be recorded with a «under review» status until the area manager confirms the service. Important: retain timestamps and the person responsible for validation for audit trail purposes.
- 2
Formal opening of the dispute
If an anomaly arises, open an internal ticket with a protocol number linked to the supplier document. Communication to the supplier must be in writing (email with read receipt or registered mail for significant amounts), indicating: invoice number, disputed amount, specific reason, supporting documents, and any amount recognized as due. Avoid generic wording («we disagree»): contractual references and quantification are required.
- 3
Separation of the undisputed amount
Core principle: what is not subject to dispute must be paid within contractual or legal terms (unless otherwise agreed). Unjustified delay on accepted portions exposes the SME to default interest (Art. 104 CO: 5% annual rate unless otherwise agreed) and deteriorates the commercial relationship, weakening the negotiating position on disputed items.
- 4
Negotiation and documentation of outcomes
Define internally who has signing authority to accept credit notes, discounts, or payment extensions. Every agreement must be archived and reflected in accounting: supplier credit note, corrective invoice, or manual adjustment with justification. If the supplier issues a correction document under Art. 27 para. 4 VAT Act, verify that it references the original invoice.
- 5
Closure or escalation
If no agreement is reached within a reasonable period (30–60 days depending on complexity), consider commercial mediation or recourse to conciliation before the conciliation authority in the canton of residence of the respondent, before any ordinary proceedings. Update the account status in accounting and inform the auditor or trustee.
Payment suspension: what is lawful and what is not
In Switzerland, suspending payment of an entire invoice for a partial defect is not automatically legitimate. The buyer has an obligation to pay the undisputed portion; they may withhold the disputed amount by invoking the exception of non-performance (Art. 82 CO) only if defects were reported promptly — in a purchase, without delay after ordinary inspection (Art. 201 CO).
«Tactical» suspension of the balance, without a substantiated dispute and without an offer of partial payment, can trigger reminders, interest, and, in extreme cases, debt collection actions or suspension of supplies. Before withholding payments beyond contractual terms, consider sending a substantiated dispute in writing and, if necessary, a formal notice of default (Art. 102 CO).
| Scenario | Recommended action | Risk if omitted |
|---|---|---|
| VAT or amount calculation error | Written dispute; payment of the correct net amount if known | Default interest on the total; loss of negotiating credibility |
| Partial delivery (60% of goods) | Payment of 60%; dispute of the pending balance | Supplier may pursue recovery of the full invoiced amount |
| Seriously defective service | Immediate written notice; suspension of disputed balance with offer of joint verification | Forfeiture of warranty rights; obligation to pay |
| Duplicate invoice | Notification with reference to payment already made (bank statement, transaction no.) | Double payment difficult to recover without proof |
| Disagreement on contractual penalty | Payment of the base service; explicit reservation on the disputed penalty | Tacit acceptance of the penalty if the full amount is withheld without distinction |
Accounting impact and VAT treatment
Accounting must reflect the economic substance of the dispute, not only the payment status. Under Swiss accounting standards (GAAP/FER), SMEs typically adopt one of the following approaches:
Recording with open item
Upon receipt, the invoice is recorded for the total amount as accounts payable (account 2000) and as costs (account 4xxx/6xxx) only if the service has been accepted. The disputed amount can be partially reversed or transferred to a suspense account «Suppliers — disputes» until the outcome is determined.
In Accountex, use internal notes and custom statuses (e.g., «disputed», «partially paid») to prevent the invoice from appearing in automatic payment proposals.
VAT deduction and disputed invoices
Input tax can only be deducted if the invoice complies with Art. 26 VAT Act and the service has been received. In case of dispute on the amount or service, the deduction must be calculated on the amount actually due: a deduction on the full invoiced amount, if a credit note is later obtained, requires an adjustment in the subsequent tax period.
Retain correspondence with the supplier as documentation supporting the deducted amount, useful in case of an audit by the Federal Tax Administration (FTA).
For significant amounts and prolonged disputes, consider a value adjustment (provision) if there is a probable obligation to the supplier on the undisputed portion, or a receivable from the supplier if an advance was paid for services not rendered. Document the estimate and calculation basis in the journal or attachments for the auditor.
Examples of accounting entries
Typical case: supplier invoice CHF 10'810 (CHF 10'000 + VAT 8.1%), of which CHF 2'000 is disputed for unauthorized hours.
| Transaction | Account | Debit | Credit |
|---|---|---|---|
| Invoice receipt (service partially accepted) | 6000 Service costs / 1170 VAT / 2000 Suppliers | 8'000 / 648 / — | — / — / 8'648 |
| Disputed portion to suspense account | 2009 Supplier disputes / 2000 Suppliers | 2'162 / — | — / 2'162 |
| Payment of undisputed portion | 2000 Suppliers / 1020 Bank | 8'648 / — | — / 8'648 |
| Supplier credit note (agreement) | 2000 Suppliers / 2009 / 1170 VAT / 6000 | 2'162 / — / 162 / — | — / 2'162 / — / 162 |
Account numbers are indicative; each SME adapts the chart of accounts to its sector. The essential point is to maintain traceability between the original invoice, dispute communications, and correction documents.
Prevention: reducing disputes at the source
A reactive workflow does not replace preventive controls. SMEs that record fewer disputes share certain practices: numbered and approved purchase orders before execution, specifications with defined scope, service acceptance clauses (e.g., signature on delivery document or acceptance report), and periodic review of supplier statements to identify duplicates or items open for months.
Digitizing the accounts payable cycle — from OCR scanning to multi-level approval in Accountex — reduces manual errors and creates an audit trail usable in negotiation or during audit. Setting alerts for invoices that exceed a variance threshold from the order (e.g., ±5%) and for suppliers with more than one disputed item in the year enables intervention before the dispute recurs.
Quick checklist for the administrative manager
- ✓ Invoice matched to order and delivery document
- ✓ Written dispute with quantified amount and attachments
- ✓ Undisputed portion paid within terms
- ✓ Accounting status updated (suspense / internal note)
- ✓ VAT deduction consistent with recognized amount
- ✓ Documentation archived for at least 10 years (Art. 958f CO)
- ✓ Escalation defined if no response within 30 days
Conclusion: administrative discipline as a competitive advantage
Managing supplier invoice disputes with a documented workflow is not only about avoiding improper payments: it protects liquidity, maintains VAT compliance, and gives management a reliable view of actual payables. The distinction between recognized and disputed amounts — both in payment and in accounting — is the principle that separates an SME that negotiates with strength from one that accumulates opaque items difficult to close at year-end.
Integrating these rules into accounting software, with approval statuses and reports on open items, transforms reactive management into a measurable and auditable process, aligned with the expectations of auditors, trustees, and commercial partners in Switzerland.