Define the scope in writing
A provider's obligation should be expressed as a list of deliverables with dates: monthly ledger closed by a stated working day, payroll run by a stated date, VAT returns filed by the statutory deadline, annual accounts delivered a stated number of weeks before filing. Scope agreed in this form removes almost all of the ambiguity that later becomes a fee dispute.
Match size to capacity, not to reputation
Large networks and small practices both serve small companies well, but for different reasons. Networks offer continuity, structured processes and international reach; small practices offer direct access to a decision-maker and flexibility. The question to ask is who will actually do the work and who will review it, rather than how large the firm is.
Establish the software position early
In markets where electronic invoicing or real-time reporting is mandatory, the accounting platform is a compliance instrument. Establish which platform the provider works with, who holds the licence, whether the platform meets local filing requirements, and how data would be exported on exit. Software decisions taken casually at the start are expensive to reverse.
Ask how the provider handles uncertainty
Compliance questions are rarely binary. What matters is whether the provider documents a position, tells the client when a matter is uncertain, and knows when to escalate to a specialist. Asking for an example of a difficult judgement the firm has handled is more informative than asking for a list of credentials.
Check service-level commitments concretely
Response times, closing dates and payroll cut-offs should be stated in the engagement letter or in a published service description. Where a provider publishes these commitments, this guide records them as documented; where they are only described verbally, they remain unconfirmed and should be put in writing.
Confirm who is accountable
Finally, identify the person accountable for the relationship, the person accountable for technical quality, and the escalation route when something goes wrong. A named engagement lead with a documented escalation path is the single most reliable indicator that the service will be managed rather than merely delivered.
Applying this method
Choosing a provider is a procurement decision with a technical core. Treated as such, it produces a shortlist, a list of open questions and a documented agreement about deliverables, rather than a search for the firm with the best reputation in the abstract.