Why mobile telephony needs to be managed systematically
In many Swiss SMEs, mobile telephony is one of the most underestimated recurring costs. Subscriptions, roaming, company devices and shared lines add up quickly, especially when every employee has a dedicated number or when the company replaces smartphones every two or three years. Without clear rules, costs become difficult to control and allocation per person or department remains approximate.
From a tax and accounting perspective, mobile telephony is not a simple telephone expense line item. If the company provides smartphones and subscriptions and allows private use, this often constitutes a fringe benefit (benefit in kind) subject to income tax and social security contributions (AHV/IV/EO, BVG); for employees subject to withholding tax, the amount also forms part of the taxable base for withholding. At the same time, for profit tax deductibility and VAT recovery, it must be demonstrated that the expense is linked to operational activity.
This guide explains how to allocate costs per employee, which limits to observe in tax and social security terms, and how to record expenses correctly in accounting — with criteria applicable to SMEs operating under Swiss accounting standards (GAAP/FER).
Mobile telephony models in the workplace
Before allocating costs, it is worth defining the organisational model adopted. Each approach has different implications for tax, accounting and administration:
| Model | How it works | Cost allocation | Tax notes |
|---|---|---|---|
| Dedicated company line | Contract in the company's name, smartphone owned or leased | Monthly cost + depreciation charge for devices assigned per employee | Private use permitted → fringe benefit to be quantified (box 2.3 of the salary certificate) |
| Flat rate per employee | Fixed monthly amount reimbursed or covered by the company up to a cap | CHF X/month per person, optionally differentiated by role | Cash allowance generally taxable; exempt only if covered by an expense regulations approved by the cantonal tax authority |
| BYOD (Bring Your Own Device) | The employee uses their own phone; the company reimburses the professional share | Documented percentage (e.g. 50–70%) or agreed flat amount | Reimbursement proportional to professional use (box 13 of the salary certificate), not the total private cost |
| Shared pool | Few lines for operational teams (construction sites, sales, support) | Allocation by cost centre or estimated hours of use | Predominantly professional use; lower risk of personal benefit |
| Corporate VoIP / eSIM | Company number on app or second SIM, centralised data | Per-user licence + voice/data cost allocated individually | Clearer separation between private and professional use if policy is strict |
Allocating costs per employee: practical methods
Allocation serves both management control and correct accounting assignment. In an SME, it is advisable to combine administrative simplicity with traceability:
Method 1 — Direct assignment
Each provider invoice shows the phone number or SIM identifier. An internal map is created: number → employee → cost centre. The monthly subscription cost and any extras (roaming, additional data) are charged entirely to the assigned person.
Suitable when each employee has a named line. Requires detailed billing statements or a provider management portal.
Method 2 — Flat rate by role
Three or four tiers are defined (e.g. administrative CHF 45, sales CHF 85, management CHF 120 per month). The actual contract cost is allocated proportionally or a documented variance margin is accepted.
Useful for companies with dozens of similar lines. Simplifies management accounting and payroll when the benefit is quantified at the same amount.
Method 3 — Device charge + service charge
Smartphones purchased or leased are depreciated or recorded as a periodic lease charge over the period of use (typically 24–36 months). The monthly device charge is added to the subscription cost to obtain the total cost per employee.
Example: device CHF 900 over 36 months = CHF 25/month + subscription CHF 55 = CHF 80/month charged to the employee.
Method 4 — Allocation by cost centre
For teams with a shared pool or rotating lines, costs are not allocated to individuals but to departments (sales, production, administration). An allocation key based on number of users, revenue or hours worked is used.
Essential for internal reporting and assessing profitability by area, even though it does not replace the tax quantification of individual benefits where applicable.
Tax limits, benefits in kind and payroll obligations
When the company provides a mobile phone and subscription, allowing private use, the Federal Tax Administration and cantonal authorities generally classify the benefit as a fringe remuneration. The value must be determined at market value or using a documented flat rate, declared on the salary certificate (generally in box 2.3) and subject to income tax and social security contributions (AHV/IV/EO, BVG). For employees subject to withholding tax, the amount forms part of the taxable base for withholding.
Swiss practice provides several methods of quantification, to be agreed with the tax adviser and aligned with the FTA instructions on the salary certificate and the directives of the canton of the employee's tax domicile:
| Situation | Indicative treatment | Recommended action |
|---|---|---|
| Exclusively professional use | No fringe benefit if private use is excluded and documented (Art. 327 CO) | Internal policy, return of device on termination, separate invoicing for any private use |
| Mixed use with monthly flat rate | Private share at market value or agreed flat rate (often CHF 20–40/month, varying by canton and device type) | Report in box 2.3 of the salary certificate, subject to contributions and income tax |
| Actual cost borne by the company | Full invoiced amount considered a benefit if private use is unrestricted | Split between company-deductible share and personal benefit share |
| Employee contribution | The portion reimbursed by the employee reduces the taxable benefit | Monthly deduction on payslip or documented internal invoicing |
| BYOD reimbursement | Expense reimbursement (box 13) if proportional and documented; excess taxable | Professional use declaration form, maximum cap agreed or provided for in expense regulations |
Profit tax and VAT
For federal and cantonal profit tax, mobile telephony expenses are generally deductible if incurred in the company's interest and properly documented. The portion corresponding to the employee's private use is not deductible as a business expense and must be excluded from the calculation base.
For VAT, input tax recovery (Art. 28 VAT Act) is permitted on expenses linked to taxable activity. Here too the private portion must be separated; without allocation, the tax authority may challenge full deductibility. Keep invoices showing VAT and, if necessary, apply a periodic adjustment for the estimated private share.
Compliant accounting entries
In the typical chart of accounts of a Swiss SME, mobile telephony falls under telecommunications and connectivity expenses. Recording varies according to the model adopted:
Recurring expenses (subscriptions, roaming, data)
On receipt of the provider invoice: debit account 6200 Telephone and internet (or equivalent account) and credit 2000 Accounts payable. If the invoice covers multiple lines, record an allocation entry to analytical accounts or cost centres, or maintain a subsidiary ledger by person.
Frequency: monthly or quarterly, aligned with the carrier billing cycle.
Smartphone purchases
Devices with significant unit value and multi-year useful life: capitalise under 1500 Office furniture and equipment with straight-line depreciation (e.g. 33% per year over 3 years). For smaller amounts below the internal capitalisation threshold (in practice often around CHF 1,000, Art. 960 ff. CO), immediate depreciation or direct expensing.
Operating lease: record the periodic lease charge to account 6200 or 6100 Rent and lease charges, without balance sheet activation.
Benefits in kind and adjustments
The non-deductible private use share must be adjusted at year-end or monthly in management accounting: partial reversal from 6200 to an adjustment account (e.g. 6950 Non-deductible expenses) or direct recording of the benefit on the payroll account (5000 Salaries) if managed via payroll.
Document the calculation basis (agreed flat rate, percentage or actual cost) for any tax audits.
Termination of employment
When the employee leaves: deactivate the line or transfer the contract, update the asset register for the smartphone (return, purchase by the employee at residual value, or write-off), and close open items relating to benefits still to be taxed in the month of departure.
Internal policy and cost control
A written mobile phone policy reduces tax ambiguity and unexpected expenses. Minimum elements to include:
- 1.Assignment: who is entitled to a line or reimbursement, with criteria linked to role and not individual preference.
- 2.Spending limits: monthly cap for roaming and extra data; approval procedure for exceeding limits.
- 3.Private use: permitted or prohibited; if permitted, method of quantifying the benefit and any employee contribution.
- 4.Security: PIN, encryption, remote wipe in case of loss; prohibition of installing unauthorised apps on company devices.
- 5.Return: timing and conditions for devices and SIMs on termination of employment.
Flagging costs outside budget
Monitor the average amount per employee monthly. Variances exceeding 15–20% of budget indicate unauthorised roaming, duplicate subscriptions or lines forgotten for former employees. A quarterly report to management is sufficient for most SMEs up to 30–40 employees.
Digitise with Accountex
Record telephone invoices with PDF attachment, link them to the supplier and accounting period, and use cost centres to automatically allocate expenses by department. Connect management accounting to payroll to transfer benefits in kind without manual year-end reconciliations.
Operational checklist for monthly closing
| Step | Responsible | Output |
|---|---|---|
| Download detailed invoices per line | Administration | CSV/PDF file archived for audit |
| Verify lines of former employees | HR + IT | List of active lines aligned with headcount |
| Allocate costs per person or cost centre | Accounting | Allocation recorded in ERP |
| Quantify benefits in kind | Payroll / adviser | Amounts transmitted to payroll system |
| Adjust private share (tax/VAT) | Accounting | Documented adjustment entries |
| Update smartphone asset register | Administration | Device inventory consistent with balance sheet |
With a defined allocation model, a clear policy and consistent accounting entries, mobile telephony stops being an opaque line item on the balance sheet and becomes a traceable, tax-compliant personnel cost under control — even when headcount grows or employees frequently work on the move away from the office.