Digital fiduciary
Your accounting, payroll and taxes —
handled digitally.
Arithma is the fiduciary (Treuhand) for Swiss SMEs and sole proprietors. We take on accounting, payroll, VAT and year-end — you keep the overview, without the paperwork.
- Digital and paperless, personally handled
- We work in your software — or set it up for you
- From sole proprietors to SMEs
Your contact
“Your numbers in good hands — personal, digital and easy to follow.”
Benjamin Thomet
Founder
Our fiduciary services
From a one-off setup to an ongoing mandate — you choose what to hand over.
Ongoing accounting
We run your financial accounting: posting documents, reconciliation, monthly or quarterly reporting.
- Document posting
- AR/AP reconciliation
- Monthly or quarterly reporting
Payroll
Monthly payslips, salary certificates and social-insurance filings (AHV, ALV, BVG, accident, withholding tax).
- Monthly payslips
- Salary certificate & annual filings
- Withholding-tax handling
VAT returns
Quarterly or semi-annual returns, effective method or flat-rate — filed with the FTA on time.
- Effective or flat-rate method
- On-time FTA filing
- Input-VAT reconciliation
Year-end closing
Balance sheet and P&L per the Code of Obligations, incl. accruals and closing entries — the basis for your tax return.
- Balance sheet & P&L per OR
- Accruals & provisions
- Basis for the tax return
Tax returns
For sole proprietors, GmbH/AG and individuals. Complete, on time and with every deduction — Switzerland-wide.
- Company & owner in one
- Every deduction reviewed
- All 26 cantons
Setup & onboarding
We set up your accounting software cleanly: chart of accounts, VAT, bank feed, templates — and migrate your existing data.
- Chart of accounts & VAT config
- Bank feed & document import
- Data migration from your old system
Let's talk about your numbers.
A no-obligation first call — by phone or email. We get back to you within one business day.