A new client onboarding checklist downloaded from someone else's firm gets used twice and abandoned, because it lists their steps and their documents in their order. The useful version is the one you build from your own process, and it takes about an hour. This page describes the sections a usable checklist has, why the borrowed ones fail, and how to size yours before you write it, so you know whether you are producing a page or four.
The sections a usable checklist has
Four. What you need from the client, itemised, each with the person who is chasing it. What you set up internally, which is the half that can run while you wait. What has to be confirmed in writing, terms, scope, contacts, the date work starts. And what closes it, the kickoff and the explicit handover into delivery. Anything that does not sit in one of those four is usually a task from delivery that has drifted forward.
Why borrowed templates fail
They encode a different firm's risk. A template from a regulated practice asks for identity documents you do not need; one from an agency skips the engagement letter you do. People notice the mismatch on the second client, start skipping lines, and a checklist with skipped lines stops being trusted, which is worse than not having one.
Size it before you write it
Count your steps and the documents you request. Rows equals steps plus documents, and that number tells you immediately whether this is a one page checklist or a document nobody will read. The free worksheet on this site computes it and then costs it in your own minutes and working days a month.
Keep it to what you tick
Every line has to be a thing a person does and can mark done. Lines like understand the client are not checklist items, they are hopes; the checklist version is read the proposal and note the three things they said they cared about. If you cannot tick it, it belongs in the process document, not the checklist.
Questions people ask about new client onboarding checklist
How long should the checklist be?
Long enough that nothing important is remembered rather than read. The worksheet returns the row count from your own steps and documents; if it is more than about thirty, look for delivery work that has crept in.
One checklist or one per service?
One, with a short section that varies. Multiple full checklists diverge within a quarter because only the one someone is currently using gets corrected.
Should the client see it?
They should see the part that is theirs: what you need from them and by when. The internal half is not interesting to them and makes the list look longer than their share of it.