Inside Deloitte’s Ex-Client Playbook

Jun 10, 2026 • 5 min read

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Here’s a question for you – what do Deloitte, McKinsey and the other Big Four do with ex-clients that almost no professional services firm does?

They never let ex-clients become “EX-clients”.

Their account partners stay close long after the engagement ends.
Months turn into years.
Cold relationships stay warm.
The next budget cycle continues the engagement.
Not RE-engagement.
The relationship did not disengage.
It did not become ‘EX’.

Professional services firms on the other hand … close out the project, send the invoice, and disappear.

It’s the same pattern, over and over.

A team finishes a successful engagement.
There’s a closing dinner.
The partner promises to “stay in touch.”
Six months later, nobody on the team can remember the last time anyone reached out.
Another six months and no one remembers the name.

And the next time that client needs another firm, who do they call?

They call whoever’s been visible.
The firm that disappeared after the closing dinner doesn’t make the call list.
The deal closes with someone else.
Were they better?
We’ll never know…

A few weeks ago I wrote about a structural problem I’ve been seeing in the software professional services firms use to manage relationships. It’s called the Relationship Blind Spot. Most software only watches active customers. Your firm grows on six or seven other kinds of relationships the software can’t see.

The dollar cost of that gap is what I call your firm’s Revenue Gap.

Ex-clients are one of the highest-value categories inside that gap.

We have built a calculator that calculates your firm’s Revenue Gap for you.

Calculate your Revenue Gap here →

Now let me show you what elite firms actually do.

They keep an account partner attached after the engagement ends.

The partner who ran the project doesn’t hand the client off.
They stay the relationship owner.
Their bonus is partly tied to whether that client comes back.
The relationship is owned by someone whose job depends on it.

They schedule cadenced touchpoints.

Quarterly check-in calls.
Not sales calls. Real catch-ups.
“How’s the post-engagement work going?
What’s changed since we last spoke?
What’s coming up that I should know about?”
The cadence is structural, not opportunistic.

They share genuine value between engagements.

An article worth reading.
An intro to a relevant person.
A briefing on something happening in the client’s industry.
Something the partner would have sent to a friend.
NOT something stamped with the firm logo and a CTA.

They track changes at the client org.

New leadership at the client.
New initiative announced.
Budget cycle approaching.
Strategic shift in the parent company.
There’s a Slack channel or a quarterly review where these are flagged.
Nothing is left to “if I happen to see it.”

They position before the next budget cycle.

Most consulting engagements get budgeted in Q3 for execution in the next fiscal year.
Elite firms know this. They’re visible in Q2.
They’re top of mind when the budget conversation happens.
The procurement decision is influenced six months before the RFP goes out.

Why do elite firms invest in any of this?

Because the retention math is well-established.

A 5% increase in customer retention can lift profits by 25 to 95 percent.

That number changed how SaaS thinks about retention.

But the consulting industry – the one that produced the research in the first place – has somehow not applied it to itself.

Most professional services firms treat the end of an engagement as the end of the relationship.
They let the client become “EX-client”.

The next deal goes to whoever shows up first when the next budget cycle hits – which is almost never the firm that did the original work.

You probably can’t run McKinsey’s account-partner machine.
You don’t need to.

What you can do – at 1/100th the cost – is borrow the principles.

A starter pack for boutique firms:

List your top 20 ex-clients from the last three years. Names. Titles. The work you did. When the engagement ended. Last meaningful contact. Two hours of work.

Designate one owner per ex-client. Usually the partner or senior consultant who ran the engagement. Their job is to know what’s happening at that client and stay top of mind.

Schedule one touchpoint per quarter. Fifteen minutes. Not a sales call. A real check-in. The kind of call where the client doesn’t feel pitched. Founders who do this consistently see inbound from those clients within twelve to eighteen months.

Send something specific once a quarter. An article that’s relevant to their work. An intro to someone they should know. A briefing on something happening in their industry. One specific, useful thing. Generic newsletters don’t count.

Watch for contact movement. If your client contact moves to a new company, you now have two warm relationships instead of one. The new company is a potential client. The old contact’s replacement is also a potential client. Set LinkedIn alerts.

Show up before the next budget cycle. Most firms get scoped in Q3 for the next fiscal year. Be visible in Q2. Schedule a strategic conversation about what’s coming up – not a pitch. A real conversation. Founders who do this consistently report winning a significant share of those re-engagement conversations they never had to compete for.

That’s the playbook.

Discipline is the hard part.
Cost is minimal.

Most boutique firms have done none of this.
The knowledge is there.
The discipline isn’t.

The engagement ends, the team moves to the next project, and the relationship that was the firm’s most valuable asset becomes overhead nobody owns.

If you want to see how much your firm’s unmanaged ex-client revenue might actually be worth, the calculator gives you the dollar number.

Calculate your Revenue Gap here → 90 seconds

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Inside Deloitte’s Ex-Client Playbook

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