Fiduciary Software in Switzerland: The Criteria That Matter in 2026

The fiduciary profession is changing faster than its tools. Clients no longer want to discover their numbers once a year; they expect answers during the year, and advisory work is overtaking data entry. Yet many fiduciaries still juggle one file per client, exports, re-imports, and binders of receipts. In 2026, good fiduciary software is judged by how completely it removes that friction. These are the criteria that matter.

Every mandate in one workspace

The first criterion is structural: a single workspace for your whole portfolio of mandates, behind a single login. Moving from one client’s books to another’s should take seconds, not the opening of a file. That is what turns a stack of dossiers into a portfolio you actually steer.

Working directly in the client’s books

The back-and-forth of files is the profession’s biggest source of lost time and errors: versions that drift apart, exports to reconcile, corrections that overwrite someone else’s work. A modern tool has you entering, correcting, and reviewing directly in each client’s accounting, in real time, with dedicated permissions per mandate. What you see is the true state of the books, always.

Documents without email

When a receipt is missing, the reflex should not be an email that gets lost. Look for a tool where the request goes out from the client’s books, the client answers in the same place, and the document lands exactly where it needs to be posted. Document collection is a process, not correspondence.

A close you validate together

Year-end close is the moment of truth in the relationship. It deserves a solid frame: immutable posted entries, corrections through reversals, an audit trail that records every step, and a joint validation with the client, in their books. It is also what keeps you audit-ready all year round.

Reports per mandate, and AI that answers

Balance sheet, income statement, and cash flow should come out in one click for each mandate, with dashboards you assemble per file. The new element in 2026 is AI that answers questions about a client’s numbers in plain language: a time saver for you, and advisory material your clients actually understand.

Clients who handle their own day-to-day

The last criterion is a clean division of labour. Your clients issue their QR invoices and drop their receipts themselves, guided by the tool; the accounting technique stays in your hands. You receive clean data instead of typing up binders, and the time saved goes back into advisory work, where your value shows most.

The questions to ask before choosing

• Can I run all my mandates from one login, in one workspace?
• Do I work in the client’s books, or on copies that need reconciling?
• Does document collection happen in the tool, or over email?
• Are posted entries immutable, with reversals and an audit trail?
• Can the client handle their day-to-day without putting the books at risk?
• Is the tool hosted in Switzerland and built for the revFADP?

Our approach at Mast

We built Mast around this collaboration: Swiss fiduciary software where your mandates live in one workspace, you work directly in each client’s books, and your clients handle the day-to-day while the technique stays with you. Taking over a mandate is simple: the existing data comes along, and our team supports you if you wish. Mast is currently opening to Swiss fiduciaries ahead of its public launch.

Want to see what this looks like across a portfolio of mandates? Book a demo or get in touch.