At some point in most careers a fork appears: continue deepening the work, or start managing people who do it.
It is usually presented as a promotion decision, which frames it wrongly. These are different jobs, not different amounts of the same job, and the skills that got you to the fork predict success at one of them and not the other.
For a practical reference on limbic resonance, Monitask provides this resource.
What actually changes
Your output becomes other people's output. The most disorienting part. You can have a productive week having produced nothing yourself, and a week where you personally did a great deal and your team got worse.
The feedback loop lengthens. Individual work gives you signal in hours or days. Management gives it in months — a hire that works out, a person who develops, a team that holds together. People who need frequent feedback find this genuinely difficult.
You lose the thing you were good at. Not immediately, but the hands-on skill erodes, and the erosion is faster than most people expect. Two years in, you are no longer the person who could do it.
Your problems become interpersonal. Not technical difficulty but disagreements, motivation, conflict, and people's lives intersecting their work.
You become a source of stress rather than a peer. Your casual remark now has weight. This changes every relationship on the team, including friendships, and it does not change back.
You absorb ambiguity for others. A large part of the job is holding uncertainty so the team can work — which is invisible and tiring.
What does not change
Seniority is still about ambiguity. Both tracks progress by handling larger and less defined problems. The difference is whether you solve them or arrange for them to be solved. See seniority: what actually changes.
Judgment still matters most. Neither track rewards being busy.
You still need to be good at something. A manager with no domain judgment cannot evaluate the work, cannot hire well, and is dependent on their team's account of everything.
How to tell which suits you
Not from preference, which is unreliable, but from evidence you already have.
When you helped someone else do something well, how did that feel compared to doing it yourself? If the honest answer is "less satisfying," that is worth taking seriously.
Do you find people problems interesting or draining? They are most of the job. Someone who finds them draining can still do the job well and will find it costly.
Are you willing to be worse at your craft? Not in the abstract — in the specific sense of watching someone do the thing you used to do best, differently, and not taking it over.
Do you like being the reason things happen, or the person who made them happen? Both are legitimate. They are not the same taste.
The reasons that go wrong
Money and level. The most common driver and the worst. If the IC ladder in your organisation stops two levels below the management ladder, the fork is not really a choice — and that is a fact about the organisation, not about you.
Check this before deciding. Compare the top of both ladders in level, in band, and in how many people are actually at each. Many "parallel" ladders are not. See titles and levels.
"It was my turn." Tenure is not a qualification.
To stop someone worse getting it. Understandable, and a poor basis for a job you will hold for years.
Because it was offered. The most common reason of all, and rarely examined.
It is more reversible than it looks
The fork is presented as permanent and mostly is not. People move back regularly, and the ones who do it well share a few things:
They do it before the craft skill has fully eroded. Two years is recoverable. Eight is a different move — closer to a career change, and it works, but it takes longer.
They frame it accurately. "I found out I prefer the work" is a legitimate and well-received explanation. Treating it as a failure invites others to treat it that way.
They move organisation, or team, if the internal narrative is fixed. Some places cannot see a former manager as an IC again. That is about the place.
They keep something hands-on while managing. A small amount of real work — enough to stay current, not enough to compete with their team. This is the single most useful hedge available and it also makes you a better manager.
The trial version
Before committing, most organisations will let you take on a smaller version: leading a project, mentoring formally, running a workstream, acting up while someone is away.
Take one, and pay attention to how you feel in month three rather than month one. Month one is novelty. Month three is the job.
If nobody offers, ask. A manager who cannot arrange a trial for someone considering the track is telling you something about how the organisation develops people.
The framing worth holding
Neither track is more senior. In organisations where that is untrue, it is a design flaw in the ladder rather than a fact about the work.
Neither is a permanent identity. The most useful careers in both directions tend to belong to people who have done some of both, and who chose deliberately rather than accepting what was offered at the moment it was offered.
For broader public guidance and background, consult the U.S. Bureau of Labor Statistics.