The New-Client Onboarding Checklist Every Bookkeeping Firm Needs

If onboarding a new bookkeeping client feels different every time, the problem isn't your team — it's the absence of a checklist everyone actually follows. A good onboarding checklist turns a stressful scramble into a calm, repeatable routine. Here's exactly what belongs on it.

Before you contact the client

The most professional onboarding starts before the client hears from you at all.

• Confirm the engagement letter is signed and on file. If it isn't, stop here — never begin work without it.
• Create the client record in your practice-management and accounting software.
• Assign one named owner who is accountable for the whole onboarding.
• Note the entity type, the services purchased, and the client's current software.
• Set a target "fully onboarded" date and put it in the calendar.

This internal setup takes five minutes and prevents the disorganised first impression that costs firms trust. (Want this as a printable? Download the free checklist.)

What to request from the client

Request everything at once, in one organised message. A trickle of follow-up emails is the single biggest cause of onboarding delay.

Business details: legal and trading name, entity type, registration and tax IDs, registered address, year-end date, and key contacts.

Financial access and history: access to accounting software (or agreement to migrate), prior-period financials, confirmation of opening balances, and the bank, card, and loan accounts to be reconciled.

Payroll, if in scope: provider, pay cycle, and employee count.

Authorisations and access: authority to act on the client's behalf, logins to required systems, and the document portal invitation.

Setting up the client properly

Once you have what you need:

• Set up or migrate the client in your accounting software.
• Connect bank and card feeds and confirm they're pulling correctly.
• Reconcile opening balances against prior-period figures — while the previous accountant is still reachable.
• Set up the document portal and invite the client.
• Confirm tax authorisation is active.

Reconciling opening balances now, rather than later, saves you from balances that never quite tie out haunting every future period.

The kickoff

A short kickoff prevents most early misunderstandings:

• Confirm what's in scope and what isn't.
• Agree your communication channel and reporting cadence.
• Name the client's day-to-day contact.
• Set expectations for the first month explicitly.

The first 30 days

• Complete the first cycle of work.
• Get a visible result in front of the client early.
• Hold a deliberate check-in near day 30.
• Confirm everything is scheduled for ongoing service before you call onboarding "done."

Why a checklist isn't quite enough

A checklist like this fixes the most urgent gap. But a flat list can't tell you which steps apply to which client. A sole trader and a limited company don't need the same path. The firms that onboard most consistently use a system that branches by entity type, service tier, and software — and increasingly, they run it as a living workflow where the right path simply appears.

If you'd like the complete branching version — with SOPs, decision trees, the full email library, and a 30-day plan — the Client Onboarding System has it all. But start with the checklist: download it free and use it on your next client.