Fractional CMO cost UK benchmarks point to a day rate of around £1,000 for senior private-sector interim work, and £1,200 or more for CMO-level work in London. One day a week therefore costs roughly £4,000 to £5,000 a month, and two days a week roughly £8,000 to £10,000. That is more per day than a full-time CMO, but far less in total, until you need more than two or three days a week.
This article builds those numbers from published UK benchmarks and GOV.UK employer costs, shows where a full-time hire becomes cheaper, and sets out what each level of commitment should actually get you.
01How fractional CMOs charge
Almost every fractional CMO price is a day rate in disguise. The packaging changes, the maths underneath does not. You will see four models.
Day rate
You pay for days worked, usually invoiced monthly. It is the most common basis for interim and fractional work: the Institute of Interim Management's 2026 survey found that 78% of interim assignments were paid on a day rate, although that share has fallen for four years running.
Monthly retainer
A fixed monthly fee for an agreed number of days, often "two days a week" or "eight days a month". It gives both sides predictability. Divide the retainer by the days included and you are back to a day rate, so always ask how many days the fee covers.
Project fee
A fixed price for a defined piece of work: a marketing audit, a positioning project, a go-to-market plan for a launch. Useful as a first step, because you see how someone thinks before committing to a longer engagement.
Retainer plus performance element
A lower base with a bonus tied to pipeline or revenue. It sounds aligned, but only works if attribution is clean and the CMO controls enough of the result to be fairly judged on it. If your CRM data is a mess, fix that first.
02Fractional CMO cost UK: what the day rate benchmarks say
There is no official register of fractional CMO rates, and most pages quoting them are marketplaces or firms selling the service. So we use the two best public benchmarks for senior interim work in the UK.
The IIM Interim Management Survey 2026 covers interim executives across all functions, not just marketing. The Robert Walters Salary Survey 2026 gives London contract day rates for specific marketing roles.
Three details matter when you read these numbers.
- Title drives the rate. Robert Walters puts London CMO contract rates at £930 to £1,510 a day, marketing directors at £660 to £1,070, and heads of marketing at £520 to £830. Someone calling themselves a fractional CMO may be pricing at any of those levels. Judge the experience, not the title.
- Sector moves it. The IIM found private-sector interims now earn 43% more on average than public-sector interims, and the private-sector average went above £1,000 a day for the first time this year.
- IR35 status moves it. The IIM survey puts the average at £949 a day outside IR35 and £830 inside. More on that below.
The fractional share is the figure to watch. The IIM asked about fractional delivery for the first time in 2026 and found nearly a quarter of last assignments were fractional. It is no longer a niche way to buy senior leadership.
03What a fractional CMO costs per month and per year
Multiply the day rate by the days. Here is the table using the IIM private-sector average and the Robert Walters London CMO average. We assume four days a month for one day a week, which is our simplification.
| Commitment | Days a month | At £1,004 a day | At £1,224 a day | Year at £1,004 |
|---|---|---|---|---|
| Advisory | 2 | £2,008 | £2,448 | £24,096 |
| One day a week | 4 | £4,016 | £4,896 | £48,192 |
| Two days a week | 8 | £8,032 | £9,792 | £96,384 |
| Three days a week | 12 | £12,048 | £14,688 | £144,576 |
Two things to check before comparing quotes. First, whether the price includes VAT, which a VAT-registered company or agency will add on top. Second, whether it includes expenses, tools or paid media. It almost never includes media spend.
04What a full-time CMO costs once you add it up
The comparison most founders make is fractional day rate against full-time salary. That flatters the full-time hire, because salary is only the start.
Payscale's UK data puts the average CMO base salary at £103,313, with most between £53,000 and £178,000. For a London scale-up the bar is higher: Robert Walters puts the average permanent CMO salary at a medium-sized London business (50 to 250 staff) at £161,200.
| Cost line | UK average CMO | London, medium business | How it is calculated |
|---|---|---|---|
| Base salary | £103,313 | £161,200 | Payscale UK average; Robert Walters London average |
| Employer National Insurance | £14,747 | £23,430 | 15% on earnings above £5,000 |
| Employer pension | £1,321 | £1,321 | 3% of qualifying earnings from £6,240 to £50,270 |
| Total | £119,381 | £185,951 | Before bonus, benefits, equity and recruitment |
The National Insurance line uses the HMRC rates for 2026 to 2027: 15% above a secondary threshold of £5,000 a year. The pension line uses the statutory 3% employer minimum on qualifying earnings.
The total still leaves out a lot. Payscale reports CMO bonuses from £3,000 to £51,000. Then there is the recruitment fee, private medical cover, any equity, the months spent hiring, and the notice period if it does not work out. Get real quotes for each before you decide.
The cost per working day
Most workers on a five-day week are entitled to at least 28 days' paid annual leave, so assume about 232 working days a year (our assumption: roughly 260 weekdays minus 28). That makes the UK average CMO about £515 per working day, and the London scale-up CMO about £800, before any of the extras above.
So per day, a fractional CMO costs more. That is not a trick. You are paying for flexibility, no hiring risk and someone who has already done the job several times.
05When does a full-time CMO become cheaper?
Divide the monthly cost of a full-time CMO by the fractional day rate and you get the break-even point.
- UK average: £119,381 a year is £9,948 a month. At £1,004 a day, that buys 9.9 days a month, or roughly two and a half days a week.
- London, medium business: £185,951 a year is £15,496 a month. At £1,224 a day, that buys 12.7 days a month, or roughly three days a week.
Because the full-time totals leave out bonus, recruitment and benefits, the real break-even sits a little higher. As a rule of thumb: below two days a week, fractional is clearly cheaper. Above three days a week, start pricing a full-time hire properly.
The question is not whether you can afford a CMO. It is how many days of senior marketing judgement your business can actually use each month. Most growth-stage B2B firms can use two, not five.
Baz Furby
Cost is only half of it. A full-time hire makes sense when marketing is a large team that needs daily leadership, or when the role carries board-level accountability that cannot be part-time. A fractional CMO makes sense when you need senior judgement and direction, and the doing can sit with a small team, freelancers or agencies.
06What you actually get at each level
The days you buy decide the job you are hiring for. Here is what we think is realistic at each level.
Two days a month: advisory
A sounding board for the founder. Reviewing plans, challenging positioning, checking agency work. Nobody is owning delivery, so do not expect pipeline to move because of it.
One day a week: strategy and oversight
Enough to set positioning and the plan, run a weekly rhythm with an existing marketer or agency, and report to the leadership team. It works if someone else does the execution. It fails if the CMO is also expected to write the content and run the campaigns.
Two days a week: owning the function
The sweet spot for most growth-stage B2B firms in our experience. Enough time to own the roadmap, sit in leadership meetings, lead a small team, manage agencies and build the reporting that ties marketing to pipeline. This is how our fractional CMO engagements usually run: an audit in the first two weeks, a 90-day priority plan, and an engagement that typically runs three to six months.
Three days a week or more: a part-time employee in all but name
At this level you are near break-even. If the need is permanent, hire. If it is a defined project, such as a launch or a repositioning, fractional still makes sense because it ends.
07How to compare fractional CMO quotes
Run every proposal through the same checks.
- Convert it to a day rate. Monthly fee divided by days included. If the proposal will not say how many days, ask.
- Check the scope. Strategy only, or strategy plus hands-on execution? Who does the work between CMO days?
- Ask what the first 90 days produce. A credible answer names specific outputs: an audit, positioning, a channel plan, a reporting view. Vague answers about "driving growth" are a warning.
- Ask for the commercial measure. Pipeline, qualified opportunities, cost per opportunity. Not followers or traffic.
- Check notice and term. In our experience a month's notice is normal. A long minimum term before you have seen any work is a risk you do not need.
- Clarify IR35. Under the off-payroll working rules, a medium or large private-sector client is usually responsible for deciding whether IR35 applies, while for a small client the contractor's own company decides. Know which you are before you agree a rate, and take advice if you are unsure.
If your biggest gap is pipeline rather than strategy, a fractional CMO may not be the first hire. Look at what B2B lead generation really costs and our published outbound packages first, then add senior marketing leadership once the pipeline engine runs. The two work best together: one sets the direction, the other builds the outbound system that fills the calendar.
08Frequently asked questions
How much does a fractional CMO cost in the UK?
It is a day rate multiplied by the days you buy. The IIM's 2026 survey puts the average private-sector interim day rate at £1,004, so one day a week costs roughly £4,000 a month and two days a week roughly £8,000. Senior CMO-level work in London sits higher: Robert Walters puts the average contract CMO day rate there at £1,224.
Is a fractional CMO cheaper than a full-time CMO?
Per day, no. A full-time CMO on the Payscale UK average base salary costs about £515 a working day once employer National Insurance, pension and holiday are counted, which is about half a typical fractional day rate. A fractional CMO is cheaper because you buy far fewer days, with no recruitment fee, notice period or equity. In our worked example, the crossover comes at around two to three days a week.
How many days a week does a fractional CMO work?
Most engagements run at one to three days a week, or a fixed number of days a month. In our view, one day a week suits strategy and oversight of an existing team, two days a week suits owning the marketing roadmap, and three days a week is the point where you should price a full-time hire properly.
Does IR35 apply to a fractional CMO?
It can. Under the off-payroll working rules, a medium or large private-sector client is usually responsible for deciding whether IR35 applies, while for a small client the worker's own company decides. The IIM's 2026 survey found interims earned an average of £949 a day outside IR35 and £830 inside, so status affects the rate you will be quoted. Take advice on your specific engagement.
How long should a fractional CMO engagement last?
Long enough to set strategy and see it executed, which in our experience means at least three months. Our own fractional CMO engagements typically run three to six months, starting with an audit in the first two weeks. Be wary of anything that has no defined outcomes or end point.