When the colleague you sat next to becomes your manager

Something has changed, whatever anyone says

When somebody is promoted out of a team into charge of it, the standard reassurance is that nothing will really be different. That is well meant and it is not true. The person now has access to information about you that they did not have last week, and they have obligations to the organisation that occasionally sit against your interests, which is the definition of a different relationship.

The specific things that have changed are worth listing rather than sensing. They will see your pay and probably the pay of everyone around you. They will be consulted about your performance in rooms you are not in. And they now carry decisions they cannot explain to you, which will look from the outside like evasiveness and is usually something quite different.

What you said before is still on the record

Most of the discomfort in this arrangement comes from history. If you complained to them about the previous manager, or discussed leaving, or told them something about your circumstances in confidence, you may now be wondering what happens to it. In practice most people are reasonably careful with old confidences, and the ones who are not tend to reveal that quickly.

The reasonable move is to say it once, plainly, rather than to circle it for months. Acknowledging that you have told them things you would not tell a manager, and asking how they want to handle that, is a short conversation and a relief on both sides. Almost every newly promoted person has been worrying about exactly the same thing and has no idea how to raise it.

They are under more pressure than you can see

The first months of managing former peers are genuinely difficult, and the difficulty is largely invisible. They are being assessed on how well they handle precisely this, they have lost the group they used to complain to, and they are being asked to form judgements about people they consider friends. Some of them respond by becoming stiff and formal, which reads as arrogance and is usually anxiety.

Others go the other way and try to remain one of the team, which fails more slowly and more badly. A manager who will not make a decision that disappoints anybody eventually makes no decisions at all, and the team notices, and the eventual correction is sharper than it needed to be. Neither of these is your problem to solve, but recognising which one you are watching makes the behaviour far easier to work with.

Rebuild the working relationship deliberately

The instinct is to carry on as before, since the relationship already exists and it worked. That is the trap. The things that were never necessary between peers — an agreed sense of what you are responsible for, a regular conversation about how the work is going, an explicit account of what you want next — are exactly the things a working relationship with a manager runs on.

So ask for the ordinary structure even though it feels absurdly formal between two people who used to share a desk. A regular one-to-one, a stated set of priorities, and one conversation about where you want to be in a year will do more than any amount of goodwill. Goodwill was the old relationship. The new one needs a record.

There is a second reason to be formal about it that has nothing to do with the two of you. Managers are asked to justify their decisions to people further up, and a manager who cannot point to anything written about a former peer is in a weak position when arguing for that person’s promotion or pay. Familiarity is not evidence, and the closeness that makes the arrangement comfortable is precisely what makes it hard to defend in a room where nobody else knows you.

Where it goes wrong, and what is actually available

Sometimes the promotion is badly handled from above. A manager given no training, no clear remit and no support will improvise, and improvisation under pressure tends to produce favouritism, avoidance or a sudden performance of authority. All three are common in the first year and most of them settle.

What does not settle is a person who uses the position against former peers, or who becomes unwilling to give anyone else credit. If you were also a candidate for the role, be honest with yourself about whether you are reading ordinary teething problems through disappointment, because that is a difficult thing to see from inside. And if the relationship genuinely cannot be rebuilt, an internal move is a normal outcome rather than a defeat; teams reshuffle after promotions for precisely this reason.