Something to doWorking with others
Reset a deadline before it slips
A simple exercise to move a date while there's still time for everyone to adjust
Why it’s worth your time
A date that moves early is a plan; a date that's missed is a problem. People build their own plans on your dates, and what hurts them is rarely the delay itself, it's having no time to adjust. Telling them as soon as you know gives them that time, and keeps your dates worth something.
How to tell someone you'll miss a deadline
You’ll come away with a new date the people waiting on you can actually plan around.
We’ll turn this into a checklist you can tick off.
- Admit the date is at risk.
Not certain to slip, just at risk. If you've been quietly hoping a good week will save it, that's usually the sign. The earlier you call it, the more options everyone has.
Tip: A useful test: if you'd feel nervous being asked how it's going, it's time.
- List who's waiting on it.
Not only the person who asked. Who plans around this date, who is waiting to start their part, who has promised it to someone else? Think about what each of them does with the date.
- Pick a new date you'd bet on.
Not the most hopeful one. Then a short, honest reason why: a dependency moved, the scope grew, you underestimated. The long story can stay with you.
- Send the reset.
The new date, why it moved, and what you need from them, if anything. If part of the work can still land on the original date, offer it.
To: the people waiting on itA heads-up on the work: I'm not going to make original date. I now expect to have it to you by new date.
What changed: the short, honest reason.
If it helps, I can still get you the part that's ready by the original date.
From you, I need anything you need, or nothing for now. If the new date breaks something for you, reply and we'll figure out a way around it.
Swap the highlighted parts for your thing. Works on Slack, in email, or said out loud. - Keep the new date.
If this one starts to wobble too, reset again early rather than hoping. Two early resets tend to cost less trust than one late miss.
Good moments for this: as soon as a date looks shakywhen something you depend on slipswhenever you catch yourself hoping it works out
We’ll turn this into a checklist you can tick off.
Keep going with Truest
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Making it work for you
Every workplace is different. Here’s what to think about before you start, and what might get in the way.
Things to think about
Someone downstream has planned around it: a launch, a client call, their own week. Knowing what they do with it tells you what they most need to hear.
What might make this harder
It usually looks better than the alternative. People tend to remember who warned them early more than they remember the slip.
Questions people ask
How do I tell my boss I'm going to miss a deadline?
As early as you can, with a new date you believe in, a brief reason why, and anything you need from them. The early part matters most.
Should I ask for an extension or just push through?
If you can realistically make it with a push, that's your call. If you're hoping rather than planning, ask now. An extension asked for in advance usually lands better than a miss explained afterward.
How do I write an email saying a project is delayed?
Lead with the new date, then why it moved, then what you need and what they can still count on. Keep it short and skip the long apology.
How much notice should I give before missing a deadline?
As much as you can. The moment you notice you're hoping rather than planning is usually the moment to say so.
Why this works, and where it comes from
The person missing a deadline is rarely surprised by it. There's usually a moment, days or weeks earlier, when you start to suspect, and then a stretch of hoping a good week will save it. The damage from a slip mostly happens in that stretch of hoping. The work isn't any later because you said so. What gets lost is the time other people could have used to adjust.
Look at it from the other side. The person waiting on you has built something on your date: a plan, a promise to their own boss, a slot in their week. A new date with notice lets them move things around. A missed date with no notice means they find out when it's already a problem, sometimes in front of someone else. That's why people who are told early tend to be generous, and people who are surprised tend to remember it.
Plenty of good managers live by a simple rule, no surprises. This is Truest's version of it, turned on yourself: you apply it to your own dates, before anyone has to ask. Being reliable isn't only hitting your dates. It's being someone whose dates people can plan around, including when they move. Someone who resets early and then keeps the new date is often trusted more than someone who is usually on time and occasionally goes quiet.
It isn't a license to move dates freely. If you find yourself resetting often, that's worth looking at on its own: how you estimate, how much you're carrying, what you're saying yes to. But for the date in front of you now, the move is simple. Say it early, say it once, and keep the new one.
Other simple things to consider
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An exercise written by Truest, based on our experience. Last updated September 25, 2026. We sell a career membership; where that’s relevant above, we say so.