What is a client onboarding checklist?

It's the list of documents and information to gather to open a client file: ID, proof of address, bank details, articles and registration extract for a company, signed mandate or contract. It serves as a reusable base for every new relationship.

What steps does a good onboarding follow?

Four steps: the kickoff (framing the engagement), document collection, validation of the documents received, then go-live once the file is complete.

Do you need a different checklist per profession?

The base is common (ID, bank details, mandate). You then add specific documents: proof of income for a broker, tax return for an accountant, NDA and brief for an agency, for example.

How do you avoid chasing every new client by hand?

By sending the checklist via a portal: the client sees what's left to provide, uploads their documents with no account to create, and automatic reminders prevent omissions without any action from you.

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May 8, 2026 · 8 min read

Client onboarding checklist: the reusable document template

A client onboarding checklist is the document that turns a new client's arrival into a smooth process rather than a series of back-and-forths. In most service firms, onboarding a new client starts with collecting documents: ID, proof of address, bank details, articles of incorporation for a company, a signed mandate. Without these, the work simply can't start.

Here are the steps of a good onboarding, the standard document checklist to reuse from one client to the next, and how to adapt it to your profession. At the end, a method to industrialise this collection without chasing every client by hand.

Why onboarding starts with document collection

Whatever the profession — broker, accountant, consultant, lawyer — the first concrete act of a new client relationship is almost always the same: gathering the documents needed to open the file. It's a practical requirement (no work without the documents) and often a regulatory one (identity checks, KYC, mandate).

And this is exactly the moment that sets the tone. A messy onboarding — documents requested one by one, by email, as you go — creates an impression of amateurism from the first contact. A clear checklist, by contrast, shows the firm knows where it's going and saves everyone time.

The 4 steps of a good client onboarding

A successful onboarding isn't just a list of documents: it's a sequence. Structuring it into clear steps avoids omissions and gives the client reassuring visibility on what's coming.

1. Kickoff

The client signs or accepts the proposal, and you frame the engagement: scope, contacts, deadlines. It's also when you announce the list of documents needed to start, so they expect it.

2. Document collection

You send the document checklist and the client uploads their files. This is the most time-consuming step if poorly tooled: it's where reminders and missing documents pile up.

3. Validation

You check that each document is present, legible, in the right format and up to date. A blurry or expired document is re-requested right away, not three weeks later.

4. Go-live

The file is complete and validated: the work can start. Onboarding ends when the client feels taken care of, with nothing left to chase.

The standard document checklist

Here's the reusable base of a client onboarding checklist. It covers the essentials for an individual as well as a company. Adapt it afterwards to your profession and regulation.

Valid ID (national ID card or passport) of the client and, where relevant, the legal representative
Proof of address less than 3 months old (utility bill, rent receipt)
Bank details / IBAN in the client's name, for direct debits or refunds
For a company: up-to-date articles and a company-registration extract less than 3 months old
Signed mandate, engagement letter or service contract
Full contact details and a named point of contact (name, email, phone)

Adapting the checklist to your profession

The common base isn't enough: each profession adds its specific documents, often imposed by regulation or by the nature of the engagement. The idea is to start from the standard template and graft your own lines onto it.

Broker (insurance, credit): proof of income, bank statements, search mandate, risk questionnaire
Accountant: registration extract, articles, latest tax return, access to bank accounts, engagement letter
Consulting / agency: brief, access to tools and accounts, NDA, signed purchase order or quote
Lawyer: case documents, representation mandate, proof of identity, fee agreement

The value of a reusable template from one client to the next

Recreating the document list for every new client wastes time and invites omissions. A reusable template solves both: you always start from the same validated base, and you no longer wonder "did I remember the bank details?".

A good template delivers three concrete benefits, especially when you onboard several clients a month.

Time saved: the list is ready, you just send it rather than rewriting it each time
Zero omissions: mandatory documents are always there, the file is complete first time
Professional image: every client gets the same polished entry journey, consistent with your brand

Industrialising document onboarding with Fabrique

Knowing the checklist isn't enough: you still have to get it filled in without spending hours. By email, you request documents one by one, you never know what's missing, and you chase by hand client after client.

With Fabrique, you turn your onboarding checklist into a journey sent by link. The client sees exactly which documents are expected, uploads them to a secure portal with no account to create, and automatic reminders handle the latecomers until the file is complete. You reuse the same template from one client to the next and get a clean file every time, ready to go live.

Frequently asked questions

What is a client onboarding checklist?: It's the list of documents and information to gather to open a client file: ID, proof of address, bank details, articles and registration extract for a company, signed mandate or contract. It serves as a reusable base for every new relationship.
What steps does a good onboarding follow?: Four steps: the kickoff (framing the engagement), document collection, validation of the documents received, then go-live once the file is complete.
Do you need a different checklist per profession?: The base is common (ID, bank details, mandate). You then add specific documents: proof of income for a broker, tax return for an accountant, NDA and brief for an agency, for example.
How do you avoid chasing every new client by hand?: By sending the checklist via a portal: the client sees what's left to provide, uploads their documents with no account to create, and automatic reminders prevent omissions without any action from you.