Hiring too early wastes a senior salary on a job that hasn't formed yet. Hiring too late means months of slipped work, and a founder who's too buried to onboard anyone properly.
The published advice doesn't agree on the right moment. This guide shows the range, gives you a scorecard you can fill in this afternoon, and works through an invented company so you can see how to read the result. It also lists the bad reasons to hire, which come up more often than the good ones.
What published guides say about stage
They give overlapping ranges, and they're describing slightly different things. All of the sources below are investors, recruiters or advisers, so treat them as informed opinion. We found no large independent study of the best hiring point.
| Source | Headcount | What it says |
|---|---|---|
| a16z | 20+, 75+, 150+ | Executive support at 20 or more, leadership team support at 75 or more, and organisation-wide support at 150 or more. It also warns against hiring because peers have one |
| Movemeon | 25 to 250 | When the business is too small for a dedicated strategy or special projects team |
| Underdog.io | 50 to 150 | Attributed to Monkhouse & Company, along with a trigger of the CEO spending over 60% of their time on operations. We read that secondhand |
| eChai | 8 to 15 | This is for a first operations person, once the founder is the bottleneck for work outside product and sales. It warns against a vanity chief of staff title |
Our reading: under 20 people, you rarely need this exact role, and a capable operations hire often fits better. From 20 to 50, it depends on whether you have the signals below. From 50 to 150, the absence of anyone in this seat starts to show. These bands are our judgment, built from the table above.
Seven signals, with a scorecard
Score each line from 0 to 2 based on the past 60 days. Use 0 for never, 1 for sometimes and 2 for most weeks. Be specific, and try to name an example for anything above 0. The signals draw on Bridgespan's list of triggers, Underdog.io's operating signs and Visible's indicators. The scoring itself is ours, and it hasn't been validated in any study.
| Signal | What it looks like | Score 0 to 2 |
|---|---|---|
| Teams wait for you | Work only moves after you clarify who owns it, in what order, or which trade-off wins | 0, 1 or 2 |
| Meetings end without closure | The leadership meeting ends with agreement and no one can say what happens next | 0, 1 or 2 |
| Priorities slip without dispute | Everyone agrees a project matters, and it has slid for a month or more | 0, 1 or 2 |
| Work falls between leaders | Pricing, a new market or a big launch has no natural owner | 0, 1 or 2 |
| Your calendar contradicts your priorities | Your top three priorities get a small share of your week | 0, 1 or 2 |
| A big change is coming | A new strategic plan, a large raise, a merger or a major launch needs coordinating | 0, 1 or 2 |
| Silos cost you | Two teams build against different assumptions, and you find out late | 0, 1 or 2 |
0 to 4: you don't need this hire. 5 to 8: fix the cheaper causes first, then rescore in a quarter. 9 to 14: start scoping the role, provided you can also pass the check on bad reasons below.
A worked example
Here's an invented company. It has 34 staff, a B2B product, about $4m in the bank and five team leads. The CEO is also the head of sales. After 60 days, the scores look like this: teams wait for the CEO (2), meetings end without closure (2), priorities slip (1), work falls between leaders (2), calendar contradicts priorities (2), big change coming (1, a Series A in nine months), silos cost them (1). That's a total of 11.
A score of 11 says this company should scope the role, so it next checks affordability. Using the middle case from our cost guide, a person costs about $18,700 a month in cash before any fee. Suppose this company burns $250,000 a month. Its runway is $4,000,000 ÷ $250,000, or 16 months. With the hire, burn goes to $268,700, and runway falls to $4,000,000 ÷ $268,700, or about 14.9 months. The cost is roughly one month of runway, and the CEO has to believe the hire earns that back before the next raise.
The company then writes down the first three problems it would hand over: run the weekly leadership meeting and its follow-up, own the Series A data preparation, and sort out pricing ownership. Because those three are specific and all cross-functional, the role has a real mandate. If it could only have written "help the CEO", the score wouldn't matter.
Bad reasons to hire a chief of staff
Each of these has a cheaper or more honest fix. a16z and Underdog.io both caution against treating this job as a catch-all, and the fixes below are our suggestions.
| The real problem | Why a chief of staff won't fix it | What to do instead |
|---|---|---|
| Your calendar, travel and expenses are a mess | That's executive assistant work, and a senior hire will resent it | Hire an assistant, even part-time |
| A department is underperforming | a16z warns against using this role as a substitute for a functional leader | Replace or coach the leader |
| Daily operations are chaotic across the whole company | You may need someone with line authority over teams | Consider a COO or head of operations |
| You don't delegate | Underdog.io says trust has to be handed over along with the tasks, or the job shrinks to coordination | Practise on small decisions first, or work with a coach |
| Your management is weak or your org design is broken | Underdog.io warns against hiring to patch these | Fix reporting lines and manager skills first |
| Your peers have one | It's a title, and it isn't a plan | Wait until you can name three problems to hand over |
Run a calendar audit before you decide
A calendar audit tells you more than any headcount rule, and it takes about an hour. BCG's research on CEO effectiveness quotes one CEO saying only about 200 minutes in a day really matter, and argues that urgent matters crowd out important ones when a calendar doesn't reflect priorities. Its sample was mainly large enterprises, but a founder's calendar fails in the same way.
- Export the last four weeks of your calendar and write your top three priorities at the top of a page.
- Tag each block as priority work, company coordination, external, or admin.
- Add up the hours for each tag. Add a rough estimate of work done outside meetings, since the calendar won't show it.
- If admin is the largest tag, you have an assistant problem. If coordination is, you have a chief of staff or operating rhythm problem. If priority work is already the largest, you may not have a staffing problem at all.
- Show the result to a co-founder and ask them what surprised them.
What to try before you hire
These steps are cheap to try and they show you what the role needs to be. Even if you hire afterwards, your first hire will have a clearer brief.
- Give one lead a stretch mandate. Bridgespan points out that hiring internally can be a real opportunity for a rising star, and some companies run the job as a rotation. A 90-day trial on one problem is a small commitment.
- Try a part-time person. A fractional chief of staff gives you evidence of what the job involves. We found no reliable published rates, so get quotes.
- Fix the meeting. One written agenda and one person who sends owners and dates within an hour can clear up a lot of the "meetings end without closure" signal.
- Use software for the information half. If you keep missing things across systems, an AI chief of staff can do the watching and first drafts for much less. It won't do the people half, so check where it stops. Nautis is one option, at $49 to $129 a month as of October 2026, and startups at seed stage often sit right at this decision. Software only helps if the records are kept up to date, so expect some work.
FAQ
When does a startup need a chief of staff?
Usually when there's a leadership team and the founder has become the place where decisions stall. Published guides place this anywhere from about 20 to 150 people. Use signals such as meetings ending without owners and work falling between leaders, then check the budget.
Is it too early to hire a chief of staff at 10 people?
Usually, yes. At that size, there's little leadership team to align, and most of the work is operations. A first operations hire or an assistant will often fit better. Someone with the skills may still join, but give them a job title that matches the work.
What is the difference between needing a chief of staff and needing a COO?
You need a chief of staff when the gap is around the founder's priorities, follow-through and cross-team projects. You need a COO when the whole company's daily operations need an owner with authority over teams. A COO is also the longer-term commitment.
How long does a chief of staff stay in the role?
a16z describes a 2 to 3 year commitment. Bridgespan quotes author Tyler Parris, who describes rotational versions lasting 18 to 36 months. Agree the likely next step during hiring, so the person doesn't feel stuck and you can plan ahead.
Sources
- a16z: how to hire a chief of staff (checked Oct 31, 2026)
- Movemeon: what is a chief of staff and when would you hire one (checked Oct 31, 2026)
- Underdog.io: how to hire a chief of staff for your startup (checked Oct 31, 2026)
- eChai: when to hire your first operations or chief of staff person (checked Oct 31, 2026)
- Bridgespan: what a chief of staff is and when you know you need one (checked Oct 31, 2026)
- Visible: why the chief of staff is important for a startup (checked Oct 31, 2026)
- BCG: the heart of CEO effectiveness (checked Oct 31, 2026)