A chief of staff owns cross-functional strategy and execution across the entire organisation. An executive assistant owns the operational layer around one senior leader – their time, communications, meetings and administrative workload. The chief of staff asks “what should we do next?” while the executive assistant asks “what do you need handled so you can focus on what’s next?” In the UK, a chief of staff costs £125,000 – £140,000 per year in total employer cost (average salary £108,000, Chief of Staff Collective, 2025), while a top-tier in-house executive assistant runs around £101,000 per year all-in. Most growing businesses need the EA first – and many discover that a strong, senior EA can bridge the gap without the CoS price tag.
You are losing hours every week to operational drag – the meetings that could have been emails, the inbox that never empties, the projects that stall because nobody is driving them forward. You know you need support. The question is which kind.
The chief of staff and executive assistant roles are often confused, sometimes merged, and frequently mis-hired. They overlap in one respect – both exist to make a senior leader more effective – but they solve fundamentally different problems and operate at different altitudes. Hiring the wrong one is expensive: the average cost of a bad hire in the UK is estimated at £12,000 – £15,000 once recruitment fees, lost productivity and re-hiring are factored in (REC, Recruitment & the Economy Report, 2024).
This guide breaks down exactly what each role does, how they differ, what they cost in the UK, and – most importantly – which one your business actually needs right now. For a closer look at what an EA handles day to day, see our full breakdown of what an executive assistant does.
What is a Chief of Staff?
A chief of staff (CoS) is a senior operational leader who works across the entire organisation on behalf of the CEO or founder. The role originated in military and government settings – the White House Chief of Staff being the most recognisable example – and has moved firmly into the commercial world. In the UK, the chief of staff role has been described as “exploding” across founder-led businesses, PE-backed firms and professional services (Lily Shippen, 2025).
The chief of staff job description typically includes:
- Strategic planning and execution. Translating the CEO’s vision into company-wide initiatives, tracking OKRs and ensuring follow-through across teams.
- Cross-functional coordination. Acting as the connective tissue between departments – unblocking projects, resolving conflicts, and keeping leadership aligned.
- Board and investor relations. Preparing board packs, managing investor communications, and owning the cadence of governance reporting.
- Special projects. Leading M&A workstreams, market expansions, org restructures, or anything that falls between existing team remits.
- Leadership proxy. Representing the CEO in meetings, making decisions within an agreed framework, and acting as a sounding board for strategic choices.
The common thread: the chief of staff operates at the organisational level. They do not manage the CEO’s diary – they manage the CEO’s priorities across the business.
What is an Executive Assistant?
An executive assistant (EA) manages the operational layer around one senior leader – their time, communications, meetings and administrative workload – so that leader can focus on the work only they can do. Where the CoS looks outward across the company, the EA looks inward at the executive’s own effectiveness.
The core responsibilities include calendar and diary management, inbox triage, meeting coordination, travel and logistics, document and briefing preparation, gatekeeping, and increasingly project management tied to the leader’s own workload. Research by Asana found that business leaders and their teams spend 58% of their day on “work about work” – status chasing, app switching, coordination overhead – rather than skilled, strategic work (Asana, 2023). A strong EA exists to reclaim that time.
For a complete list of duties – including a day-in-the-life walkthrough and delegation framework – see our guide to what an executive assistant does. For the specific dynamics of supporting a CEO, see executive assistant to CEO.
Key Differences at a Glance
Both roles exist to make a senior leader more effective – but they do it in fundamentally different ways. This table puts the differences side by side.
| Dimension | Chief of Staff | Executive Assistant |
|---|---|---|
| Primary focus | Organisational strategy and execution | One leader’s time and operational flow |
| Scope | Cross-functional, company-wide | Leader-specific, sometimes team-level |
| Reports to | CEO / founder directly | CEO, C-suite exec, or senior leader |
| Decision-making | Makes strategic decisions within a framework | Makes operational and scheduling decisions |
| Key question | “What should we do next?” | “What do you need handled?” |
| Typical background | Management consulting, ops, strategy | Senior administration, business support |
| Board / investor work | Owns board packs, investor comms | Schedules board meetings, manages logistics |
| People management | Often manages teams or projects | Rarely manages people directly |
| UK salary range | £108,000 avg salary (£125k – £140k total employer cost) | £39,000 – £43,000 avg salary (£101k total employer cost for top-tier) |
| Seniority level | Senior leadership / C-suite adjacent | Mid to senior support professional |
The simplest test: if the problem is “I don’t have time to think,” you need an EA. If the problem is “I have the ideas but nothing is getting executed across the business,” you need a chief of staff.
Salary and Cost Comparison (UK)
The salary gap between the two roles is substantial – and it widens when you factor in the true cost of employment beyond the headline number.
Chief of Staff salary (UK): The most reliable UK-specific data comes from the Chief of Staff Collective’s 2025 annual survey, which puts the average at £108,000 – up 6% from £102,000 in 2024 and roughly 30% higher than the first survey in 2022 (Chief of Staff Collective, 2025). Broader job-board data from Indeed (£73,540) and PayScale (£78,289) skew lower because they include more junior and regional roles (Indeed UK, 2026). London roles average £89,930 (Glassdoor, 2026), and senior positions in PE-backed or financial services firms regularly exceed £150,000. Notably, 56% of UK chiefs of staff now receive an annual bonus, up from just 27% in 2022.
Executive Assistant salary (UK): The national average is £39,325, rising to £48,195 in London (Indeed UK, 2026; based on 3,600 reported salaries). Other sources put the national average slightly higher at £43,492 (Reed, 2026). Senior EA-to-CEO roles in London financial services and Magic Circle law firms reach £65,000 – £75,000+ with 10+ years of C-suite experience (Robert Walters, 2026). An 8 – 15% premium applies for AI tool proficiency, financial services regulatory knowledge, or multilingual capability.
Why headline salary is misleading: The figures above are gross salaries – what the employee sees. The number that matters to your business is total employer cost: salary plus employer National Insurance (13.8% above the threshold), workplace pension (minimum 3%), recruitment agency fees (typically 15 – 20% of salary for the first year), equipment, software licences and office costs. For a senior role, mandatory employer contributions alone add roughly 16% on top of the gross salary.
In practice, a top-tier in-house executive assistant in the UK costs around £7,266 per month / £101,390 per year in total employer cost – and that is before recruitment fees, HR overhead and onboarding time are factored in. Scale that up to a chief of staff at £108,000 gross, and the total employer cost reaches approximately £125,000 – £140,000 per year, rising further with bonus (56% of UK chiefs of staff now receive one).
That gap – roughly £25,000 – £40,000 per year between the two roles in total employer cost – is the central question of this article. Is the strategic work you need worth that premium, or can a strong EA handle most of it? And critically: is there a way to get senior EA support without the full in-house cost?
When to Hire a Chief of Staff
A chief of staff makes sense when the bottleneck is strategic execution, not personal time management. Specifically:
- You have a strategy but nothing is landing. OKRs are set, priorities are agreed, but cross-functional projects stall because nobody owns the follow-through between departments.
- You are scaling past 50 – 100 people. At this stage, the CEO can no longer hold the full operational picture. A CoS becomes the connective tissue between leadership and execution.
- Board and investor reporting is consuming your week. If board pack preparation, investor updates and governance cadence have become a significant time drain, a CoS owns this end to end.
- You need a proxy in the room. When you cannot attend every meeting but still need decisions made within your framework, the CoS represents you.
- You are running a transformation. M&A integration, market expansion, organisational restructure – anything that cuts across teams and needs a senior operator at the helm.
UK recruiters note that the chief of staff role is growing fastest in founder-led businesses and PE-backed firms where operational complexity outpaces the leadership team’s capacity to execute (Elliott Scott HR, 2025).
When to Hire an Executive Assistant
An executive assistant makes sense when the bottleneck is your own time and operational flow. Specifically:
- Your calendar runs you. Double-bookings, missed meetings, no protected focus time – the diary is chaotic and you are reactive rather than intentional about your time.
- Your inbox is a second job. You spend 1 – 2 hours daily on email triage, replies and follow-ups that a capable person could handle in your voice.
- Travel, expenses and logistics eat your evenings. You are booking your own flights, filing your own expenses, and losing after-hours time to coordination that should be handled upstream.
- You are a founder or solo leader. At the pre-scale stage (under 50 people), the problem is usually personal bandwidth, not cross-functional execution. An EA gives you back 10 – 15 hours a week.
- You have a strategy and you know what to do – you just cannot get to it. The strategic clarity is there; the problem is that operational noise keeps pushing it down the list.
A 2025 YouGov survey of 1,246 UK office workers found that 24% spend 6 – 10 hours per week on administrative tasks like email, scheduling and document management – yet only 17% spend the same amount of time on strategic meetings and decision-making (Dropbox/YouGov, 2025). That imbalance is exactly what an EA corrects.
The hiring sequence matters. UK recruitment specialists consistently advise hiring an “operator-grade EA” before a chief of staff, because operational drag typically precedes strategic complexity – and many businesses stabilise with a strong EA and never need the CoS at all (Lily Shippen, 2025).
The Third Option: a Premium EA That Bridges the Gap
Here is what the clean chief of staff vs executive assistant distinction misses: in practice, the best executive assistants already operate in the space between the two roles.
A senior, experienced EA does not just manage a diary. They manage stakeholder relationships, own project timelines, prepare board materials, draft communications in the leader’s voice, and make operational decisions without needing to check in. They do not set the company’s strategy – but they remove every obstacle between the leader and the execution of that strategy.
For many founders and leaders – particularly those running businesses with 10 – 80 people – a premium executive assistant delivers 80% of the chief of staff’s practical value at roughly half the cost:
- Calendar and time architecture – not just booking meetings, but designing the leader’s week around strategic priorities.
- Stakeholder and board logistics – scheduling, briefing prep, follow-up tracking, and the operational layer of governance.
- Project tracking and accountability – keeping initiatives on schedule, chasing deliverables, and flagging blockers before they stall.
- Communication management – inbox triage, draft responses, and representing the leader in routine exchanges.
- Information flow – ensuring the right data, documents and context reach the leader before they need it.
The difference is that this level of EA support is not the entry-level, task-based assistant most people picture when they hear “EA.” It is a senior professional with 5 – 15 years of C-suite experience, operating as a genuine extension of the leader.
At DonnaPro, this is exactly what we provide. Our executive assistants are experienced, UK-timezone professionals who support founders and C-suite leaders remotely – handling everything from inbox and diary management through to board preparation and project oversight. No recruitment fees. No employer NI. No managing the manager.
Consider the total employer cost comparison: an in-house top-tier EA costs around £8,449 per month (£101,390/year) before recruitment fees and onboarding. A chief of staff costs £10,400+ per month. A DonnaPro managed EA starts from £2,350 per month for part-time support – with dedicated quality monitoring, 9-day onboarding, and no employer overhead. That is the same calibre of executive-level support at a fraction of the in-house cost.
For a closer look at what a C-suite EA actually handles, see our guide to C-level executive assistants.
Frequently Asked Questions
A chief of staff owns cross-functional strategy and execution across the entire organisation – setting priorities, coordinating between departments, managing board relations and leading special projects. An executive assistant owns the operational layer around one senior leader – their calendar, inbox, meetings, travel and administrative workload. The CoS asks “what should we do next?” while the EA asks “what do you need handled so you can focus?”What is the difference between a chief of staff and an executive assistant?
A senior executive assistant can handle many responsibilities that overlap with a chief of staff – board preparation, stakeholder coordination, project tracking, and operational decision-making. The distinction is scope: an EA focuses on one leader’s effectiveness, while a CoS operates across the business. For many growing companies, a premium EA delivers 80% of the CoS’s practical value at roughly half the cost.Can an executive assistant do the job of a chief of staff?
The UK average chief of staff salary is approximately £108,000, up 30% since 2022 (Chief of Staff Collective, 2025). London roles average £89,930 (Glassdoor, 2026), and senior positions in PE-backed or financial services firms regularly exceed £150,000. Once employer NI, pension and recruitment costs are added, the true employment cost is 30 – 40% above the headline salary.How much does a chief of staff earn in the UK?
The UK average executive assistant salary is £37,560, rising to £46,844 in London (PayScale, 2026). Senior EA-to-CEO roles in London financial services reach £65,000 – £75,000+ with 10+ years of experience (Robert Walters, 2026). Skills premiums of 8 – 15% apply for AI tool proficiency, financial services knowledge, or multilingual capability.How much does an executive assistant earn in the UK?
Most growing businesses should hire an executive assistant first. Operational drag – calendar chaos, inbox overload, administrative backlog – typically precedes strategic execution problems. A strong EA resolves the time and bandwidth constraints that many leaders mistake for a need for a chief of staff. Once an EA is in place, it becomes clearer whether the remaining gap is truly strategic (CoS territory) or whether a senior EA can continue to bridge it.Should I hire a chief of staff or an executive assistant first?
A chief of staff’s day typically includes reviewing progress on strategic initiatives, leading or attending cross-functional meetings, unblocking stalled projects, preparing materials for board or investor communications, advising the CEO on operational decisions, and coordinating between department heads. Unlike an EA, the CoS rarely handles personal scheduling or inbox management – they focus on organisational execution and alignment.What does a chief of staff do day to day?
