Behavioural · UK 2026
How to answer "Tell me about a time you missed a deadline"
Interviewers also phrase it as:
- "When have you not delivered on time?"
- "Tell me about a project that ran over"
- "Describe a delivery that slipped"
Why interviewers ask
Tests delivery discipline, communication during slippage, and accountability. Interviewers want to know whether you spot risk early, communicate proactively, and learn from slippage — or whether you over-promise and miss without warning. Strong answers describe a specific miss, the early signal you saw (or missed), how you communicated, and what you changed afterwards.
Model answer
About [timeframe] ago I committed to [specific deliverable] by [specific date]. The signal that I was going to miss came at [specific time before the deadline]. I [specific actions: communicated to manager + stakeholders, replanned, descoped if appropriate]. I missed the deadline by [specific gap], delivering on [date]. What I changed afterwards was [specific behavioural or operational change]. The lesson was [self-aware reflection].
What to avoid (common bad answer)
I had a project that ran over but it wasn't really my fault — there were external dependencies. (Blame-shifting — flags lack of accountability.) Or: I've never really missed a deadline. (Almost certainly false; flags self-awareness gap.) Both fail.
Structure of a good answer
- 1 Specific deliverable with specific deadline
- 2 Early signal you spotted (or missed) of risk
- 3 Specific communication actions to manager and stakeholders
- 4 Honest gap: how much you missed by
- 5 Specific behavioural change since
Common mistakes
- ✗ Claiming you've never missed a deadline — disqualifying
- ✗ Blame-shifting to dependencies, team, or circumstances
- ✗ Failing to surface the slippage early — flags poor communication
- ✗ Over-elaborate explanation that hides the gap
- ✗ No specific change since — flags absence of learning
Recruiter pro tip
The strongest answers I've heard surface the slippage early — usually the candidate flagged risk to their manager 2-4 weeks before the actual deadline. That proactive communication is what separates senior delivery from junior delivery. Hiring managers don't punish slippage that was communicated early; they punish surprises.
FAQ
How big should the missed deadline be? ▼
Real but recoverable. A 1-week miss on a 4-week project is fine; a 6-month miss on a 3-month project flags poor planning.
What if the miss was genuinely caused by external factors? ▼
Acknowledge them but own the response: 'The dependencies slipped, but my mistake was not building enough buffer for that risk.' Always pull the accountability back to you.
Should I mention I learned to over-estimate timelines? ▼
Carefully — sometimes valid, but can flag risk-aversion. 'I now build explicit risk buffer into my estimates' is better framing.
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