Client Onboarding Document Checklist (By Profession)

Q: What should go on a client onboarding document checklist?

Only items you will actually look at, each named in the words the client would use, with the acceptance criteria stated. Every optional item you add costs real delay, because clients estimate the size of the task from the length of the list and postpone accordingly.

Q: How should each item be worded?

Name the document, give examples of what qualifies, and state any constraint such as a date range or that all four corners must be visible. 'Proof of address - a utility bill, council tax letter or bank statement from the last three months showing your name and address' removes a question that would otherwise cost two days.

Q: Which item should a client start with?

Whichever one depends on somebody else - a reference, a certificate from a registry, an official translation, a document held by a previous adviser. That item sets the real completion date, and clients usually leave it until last because it looks like just another line.

September 7, 2026

A document checklist is not a list of documents. It is a set of instructions that has to work when read on a phone by somebody who does not know your profession's vocabulary and is doing this once. Most onboarding lists fail at that, and the failure looks like an unresponsive client.

Quick answer (TLDR)

Include only what you will actually look at - every extra item costs delay
Name each document the way the client would, and state what makes it acceptable
Flag the item that depends on a third party and say to start it first
Say explicitly that phone photographs are fine
Say roughly how long the whole thing should take, so it gets started

The five rules that matter more than the list

1. Only ask for what you will use. Clients estimate effort from the number of lines. Two speculative "might as well get it while we're here" items can be the difference between a list that gets started this evening and one that gets deferred to the weekend.

2. Use their words, not yours. "PoA," "ID&V," "SOF," "engagement letter" - all clear to you, all opaque or ambiguous to a first-time client. A client who is unsure what you mean will not guess. They will wait, and waiting is invisible from your side.

3. State the acceptance criteria. Not "bank statements" but "the last three months of statements for your main current account, showing your name and address at the top." The second version prevents the round trip where the wrong months arrive.

4. Say photographs are fine. In writing, in the list itself. Clients assume a phone photo will be rejected as unprofessional and delay rather than send one. Add the two rules that make photos usable: flat surface with good light, and all four corners inside the frame.

5. Name the long-lead item. Almost every list has one thing that depends on somebody else. Say which, and say to start it today. This single sentence is often worth more than everything else, because it moves the longest task from last to first.

Starting lists

These are starting points, not compliance advice. What you must collect depends on your sector, your country and your own risk assessment, and that is a question for your own regulator or professional body rather than for an article.

Accounting and bookkeeping - new business client

Proof of identity for each director or partner: passport photo page, or national ID card, both sides
Proof of address for each: utility bill, council tax letter or bank statement from the last three months, showing name and address
Company registration details, or the registration certificate if you have it
Last set of filed accounts, if there is one
Access to the bookkeeping system, or the last twelve months of records in whatever form they exist
Bank statements for the period since the last accounts, main account first
VAT or tax registration details, if registered
Details of your previous accountant, so we can request handover - start this one first, it takes longest
Signed engagement letter (we will send it; you can sign it in the portal or return a photo of a signed copy)

Legal - new matter

Proof of identity: passport photo page, or national ID card, both sides
Proof of address from the last three months: utility bill, council tax letter or bank statement
Any contract, correspondence or document central to the matter, even in draft
The full email or letter thread with the other side, if there is one - forward it or photograph the letters
Any deadline you are aware of, including anything with a date on it
Details of any previous adviser on this matter, and whether they hold a file - start this one first
Signed engagement letter and terms

Mortgage and financial advice

Photo ID: passport or driving licence
Proof of address from the last three months
Last three months of payslips, or last two years of accounts if self-employed
Last three to six months of bank statements for the account your salary is paid into
Proof of deposit and where it came from - if any of it was a gift, we will need a short letter from whoever gave it, so start that one first
Details of existing credit commitments: loans, cards, car finance
Signed disclosure and authority forms (sign in the portal, or send a photo of the signed page)

Consulting - new engagement

Signed statement of work or engagement letter
Purchase order or billing reference, if your finance team requires one on invoices
Names and email addresses of the people we will work with, and who signs things off
Any existing material on this problem: previous reports, analyses, decks, even if out of date
Access to whatever systems or data the work needs - this often needs your IT team, so start it first
Any confidentiality or security requirements we need to meet

Adapt these. The structure is the transferable part: identity, evidence, context, access, signature, and one item flagged as the long pole.

Wording the message around the list

The list is half of it. The message is the other half.

Say what the list is for, in one sentence, particularly for anything that could read as intrusive. "We need three months of statements to verify the deposit; only I will look at them" is often the difference between a three-week delay and a reply the same day. Financial and identity documents feel exposing, and clients occasionally go quiet for that reason and never say so.

Say roughly how long it should take. "Most of this is twenty minutes if you have the documents to hand." Clients who think a task might take two hours schedule it for a weekend that keeps not arriving.

Say what happens next and when. A list with no stated ending leaves the client unsure whether more will be asked, and that uncertainty produces the "just checking?" emails.

Give one destination that will still work in three weeks. A phone client cannot find an email from three weeks ago, and if the list only exists inside one message, it has to be found again and usually is not.

Where a portal fits

We build one, so weigh this accordingly.

In Droplana the checklist lives inside the client's own portal rather than in a message. You set it per client. They open one link - no account, no password - and see which items have arrived and which are still outstanding, so they can finish it without waiting for you to say anything. Documents can be photographed straight from the phone with the Take Photo button. If something needs redoing you comment on that specific file rather than writing a fresh email about "the documents."

What it does not do: decide what to ask for, or write the message around it. The list above is still yours to build, and the sentence explaining why you need the bank statements is still one you have to write.

More on the sequencing in onboarding a new client without a week of email, and on the causes of non-response in why clients don't send documents. The accounting practices page and the legal page show the same lists in the context of a full engagement.

The short version

Ask only for what you will use. Name each item the way the client would and say what makes it acceptable. Flag the one that depends on someone else and tell them to start it first. Say photographs are fine, say how long it should take, and give one destination that still works in three weeks.

Want the checklist to live where the client can see it instead of in an email? Try Droplana free - three clients, no card.