How to write an apology email to a client

A good client apology does five things in order: owns the mistake plainly, explains (briefly) what happened, fixes the impact, prevents the repeat, and — only if warranted — offers a gesture. Most bad apologies fail at step one, hiding behind passive voice: "mistakes were made", "we apologize for any inconvenience".

Speed matters more than polish. A direct apology sent within hours beats a lawyer-perfect one sent next week.

Copy-paste templates

Apology for a missed deadlineProfessional

Subject: [Deliverable] delay — apology and revised plan

Dear [Name],

I'm sorry — we missed the [date] deadline for [deliverable], and you should have heard about the risk from me before the date, not after. That's on us.

What happened, briefly: [one-line honest reason].

Where we are now:
- [Deliverable] will be with you by [new date] — this date is confirmed
- [Interim item] is attached so your team isn't blocked

To prevent a repeat, we've [concrete change]. Thank you for your patience — and if you'd like to talk this through, I'm available anytime.

Sincerely,
[Your name]

Apology for an error in delivered workProfessional

Subject: Correction to [deliverable] — our error

Dear [Name],

We found an error in the [deliverable] we sent on [date]: [plain description of what was wrong]. I'm sorry — this should have been caught in our review.

The corrected version is attached. The impact: [what, if anything, the client needs to check or redo]. We've verified the rest of the document is unaffected.

We've added [specific check] to our process so this doesn't happen again. If the error caused any downstream work on your side, tell me and we'll make it right.

Sincerely,
[Your name]

Apology for poor communication or serviceSupportive

Subject: You deserved better from us — apology

Dear [Name],

I want to apologize for [the experience — e.g., the slow responses over the past two weeks]. You shouldn't have had to chase us, and I understand the frustration.

There's no excuse, but there is an explanation: [one honest line]. Here's what changes starting today: [concrete change — e.g., I'm now your direct contact and will respond within one business day].

Your business matters to us, and I'd welcome a short call this week to make sure we're back on track.

Sincerely,
[Your name]

These templates are a starting point — your situation has its own details. Paste your own draft into our free tool and get it rewritten in the exact tone you need.

Rewrite my email — free

Paste your draft, pick a tone, get 3 rewrites + subject lines in seconds. No signup.

What ruins a client apology

"We apologize for any inconvenience this may have caused" — corporate wallpaper that says nothing. Name the actual inconvenience.
The conditional apology: "I'm sorry if you felt…". It relocates the problem into the client's feelings. Apologize for what happened, not for their reaction.
Blaming a third party or a junior colleague. To the client, you are the vendor; own it as "we".
Over-explaining. Two sentences of reason reads as honesty; two paragraphs reads as excuse-making.
Apologizing without a fix. The apology is the headline; the recovery plan is the substance.

Frequently asked questions

Should I offer compensation or a discount?

Only when there was real, measurable impact — and lead with the fix, not the discount. A well-handled recovery often rebuilds more trust than a refund. For serious failures, a proactive gesture (credit, free month, waived fee) shows you grasp the severity.

Should the apology come from me or from my manager?

The person who owns the relationship should sign it. For major failures, a brief additional note from someone senior ("I'm aware of what happened and personally making sure…") adds weight without throwing anyone under the bus.

Email or phone call for a serious mistake?

Both: call first so they hear it from you directly, then follow up with an email that documents the facts and the recovery plan. The call carries the sincerity; the email carries the commitments.