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Common new manager mistakes, and how to fix each one

The most common new manager mistakes are doing the work yourself instead of getting it done through the team, avoiding the hard conversation until it's a crisis, changing too much in the first month, being unclear about what good looks like, and treating everyone the way you'd want to be treated. Almost every one comes from the same root: the skills that got you promoted aren't the ones the new job needs. Each is fixable, usually in a week, once you can see it.

Below: why new managers fall into the same traps, 15 mistakes with the sign you're making each one and what to do instead, a table to scan, how to spot your own, how to recover once the team has noticed, a one-week reset, and the habits that stop them coming back.

Why new managers make the same mistakes

Most people are promoted because they were good at the job they had: the best nurse on the unit, the fastest engineer, the salesperson with the biggest numbers. The new job measures something else. Your output is now the team's output, and the work is mostly conversations, decisions and follow-up.

Linda Hill, who followed new managers through their first year for her book Becoming a Manager (Harvard Business School Press, 1992; second edition 2003), found they tend to start with wrong ideas about the role. They expect authority to come with the title, they expect to manage people one at a time, and they expect that keeping things running smoothly is the job. In her 2007 Harvard Business Review article "Becoming the Boss", she describes how each of those beliefs gets in the way. The mistakes below are mostly those beliefs in action.

Two other things make it harder:

• Little training. Many new managers get a title and a team on the same day, and learn on the job.
• No feedback. As a team member, you got told when you did well. As a manager, people rarely tell you what you're doing wrong. You have to ask.

The 15 most common new manager mistakes

Each one comes with the sign you're making it, what to do instead, and where it helps, the words to say.

1. Doing the work instead of managing it

The sign: you're still the one who fixes the hard bug, closes the big sale or takes the difficult patient, and you finish your days with no time for 1:1s.

Instead: pick one task a week you'd normally grab and give it to someone, with the outcome, the deadline and how much say they have. Your job is to make five people better at it, not to be the best at it yourself. The full method is in how to delegate as a manager.

2. Micromanaging

The sign: you ask for updates more than once a day, rewrite people's work, or get copied on everything.

Instead: agree how and when you'll check in before the work starts ("send me a two-line update Thursday"), then stay out until then. Check the result, not each step. If someone really needs closer support, say so and set an end date for it.

3. Avoiding the hard conversation

The sign: there's a person whose lateness, attitude or work you've been "keeping an eye on" for more than two weeks, and they don't know.

Instead: raise it within a few days, privately, with one specific example and what you need instead. Small and early is kinder than big and late. Our guide to difficult conversations with employees has openings for eight common ones.

4. Changing too much, too soon

The sign: in your first month you've rewritten the rota, the meeting, the process and the tools, and the team is quieter than when you started.

Instead: spend the first 30 days listening. Meet everyone, ask what works and what doesn't, and change one small thing they asked for. Bigger changes go in month two, with the reasons. Our 30-60-90 day plan lays out the order.

5. Not being clear about what good looks like

The sign: you're disappointed in work that the person thought was fine.

Instead: for every piece of work that matters, say the outcome, the standard, the deadline and how you'll judge it. Then ask them to say it back. See how to set expectations with employees for a one-page template.

6. Trying to stay everyone's friend

The sign: you soften decisions to keep people happy, or you still go for drinks with the same two people from your old team and nobody else.

Instead: be friendly with everyone and close with no one in particular. You can still care about people; you just can't have favourites. If you were promoted from within, our guide to managing former peers covers what to say.

7. Treating everyone the same way

The sign: you motivate, praise and correct everyone the way you'd want it, and it works on some people and falls flat on others.

Instead: ask each person how they like feedback, what a good week looks like for them, and what they want to be doing in a year. Fair means the same standards, not the same approach. Our guide to motivating your team has the questions.

8. Skipping or cancelling 1:1s

The sign: your 1:1s get moved whenever something urgent comes up, which is most weeks.

Instead: treat them as the last meeting you cancel, not the first. If you must move one, move it, don't drop it, and say why. A 30-minute 1:1 every week or two is where most problems surface early. Start with how to have an effective 1 on 1.

9. Only giving feedback at review time

The sign: the annual or quarterly review is the first time someone hears about a problem, or about something they did well.

Instead: give small feedback weekly, both kinds. Name the specific thing they did and its effect. Nothing in a review should be news. The 40 feedback examples guide has lines to borrow.

10. Taking credit, or sharing blame

The sign: in meetings with your boss you say "I" about the team's work, or you mention who made the mistake.

Instead: upwards, credit goes to named people and blame comes to you. Then deal with the mistake privately with the person. Nothing breaks trust faster than the opposite. More in how to build trust with your team.

11. Not managing up

The sign: you don't know what your boss is judging you on, and you find out about their worries from someone else.

Instead: ask your own manager in the first week: "What does a good first 90 days look like to you? What should I not change? How do you like updates?" Then send a short weekly note: what got done, what's at risk, what you need.

12. Saying yes to everything

The sign: your team is overloaded, and you keep accepting new work from other teams because saying no feels unhelpful.

Instead: protect the team's capacity. Before saying yes, ask what it replaces.

13. Not asking for help

The sign: you're stuck on a people problem and haven't told anyone, because asking feels like admitting you're not ready.

Instead: find two people to ask: your own manager for the job, and an experienced manager outside your line for the hard calls. Asking early is part of the job. HR can help with anything that might become formal.

14. Ignoring conflict and hoping it settles

The sign: two people on your team don't speak to each other, and others are working around them.

Instead: talk to each person alone first, then together if needed. Focus on the work and how they'll handle it from now on, not on who was right. Our guide to handling conflict between employees has the steps and a 30-minute joint meeting.

15. Running meetings nobody needs

The sign: your team meeting is a round of status updates that could have been an email, and people bring laptops.

Instead: every meeting has a purpose you can say in one sentence, an agenda sent ahead, and decisions written down. Updates go in writing; the meeting is for problems and decisions. See how to run an effective team meeting.

Want one small fix like these every morning? Take the 2-minute quiz and get a 10-minute lesson and one script a day, for the talks you lead.

New manager mistakes at a glance

How to spot your own mistakes

Most of these are invisible from the inside. Four ways to see them:

1. Look at your calendar. If more than half your week is your own individual work, you're doing instead of managing. If 1:1s have moved more than twice in a month, that's mistake 8.
2. Count the open issues. Write down every problem with a person you've noticed but not raised. Anything older than two weeks is mistake 3.
3. Ask the team directly. In 1:1s: "What's one thing I could do differently that would make your job easier?" Ask it every few weeks. The first time, people may say "nothing"; ask again, and thank the first person who answers honestly.
4. Ask your boss and one peer. "If you could change one thing about how I'm managing, what would it be?"

When you hear something, don't explain or defend. Say thank you, say what you'll do, and do it where they can see.

How to recover from a mistake your team has seen

A team forgives most mistakes quickly if you name them and change. What it doesn't forgive is a manager who pretends nothing happened. Three steps:

1. Name it plainly, once. No long apology, no excuses.
2. Say what changes, and from when.
3. Keep the change for a month, visibly. That's what repairs it, not the words.

After changing too much too soon

After micromanaging

After letting a problem slide

After taking credit

A one-week reset

If you recognise several of these, don't try to fix all fifteen at once. Use one week:

Habits that stop them coming back

• A weekly 15-minute review on Friday: Did every 1:1 happen? Is there an issue I haven't raised? What did I do this week that someone else should have?
• A promise list. Write down every "I'll get back to you". Keep each one or renegotiate before the date.
• One piece of feedback a week per person, praise or correction, specific.
• A standing question in every 1:1: "What should I do differently?"
• Read one good book a quarter. Our list of first time manager books says which three to start with.

Which of these mistakes you're most likely to make depends on your style: someone who loves fixing things drifts into doing the work, someone who loves harmony avoids hard talks. The free leadership style quiz takes about two minutes and names yours.

Questions about new manager mistakes

What is the biggest mistake new managers make?

Doing the work themselves instead of getting it done through the team. It feels productive, but it leaves no time for the people, and the team stops growing.

Is it normal to struggle as a new manager?

Yes. It's a different job from the one you were good at, and most people learn it while doing it. Struggling in the first months says little about whether you'll be good at it.

How long does it take to get comfortable as a new manager?

It varies. Many people feel steadier after the first few months, once they've had their first hard conversations and seen the team through a busy stretch. Hill's research followed managers through a whole first year.

Should I admit my mistakes to my team?

Yes, the ones that affected them: plainly, once, with what changes. It also makes it safe for them to admit theirs.

What should a new manager not do in the first 90 days?

Don't make big changes before you've listened, don't criticise the last manager, don't pick favourites, and don't let a problem with one person run for weeks without a word.

How do I know if I'm a bad manager?

Watch for signs: people stop bringing you problems, good people ask to move, and you find out about issues late. Then ask your team directly. Asking is itself a good sign.

Next: read first time manager tips, take the free leadership style quiz, or browse all our guides for new managers.

Sources

• Linda A. Hill, Becoming a Manager: How New Managers Master the Challenges of Leadership, Harvard Business School Press, 1992; 2nd edition 2003.
• Linda A. Hill, "Becoming the Boss", Harvard Business Review, January 2007: https://hbr.org/2007/01/becoming-the-boss
• Michael D. Watkins, The First 90 Days, Harvard Business Review Press, 2003; updated 2013.
• ProofHub, "11 Mistakes new managers make & how to avoid them": https://www.proofhub.com/articles/manager-mistakes