How Many Days Per Month Is a Fractional FD Available?

The number of days per month your fractional Finance Director is available to your business is one of the most important decisions you will make at the start of the engagement. Get it right and you receive exceptional strategic financial leadership at a fraction of the cost of a full-time hire. Get it wrong — in either direction — and you either pay for time you do not use or find yourself chronically under-resourced. This guide helps you understand how day allocations work, what is typical at different business sizes, and how to flex the arrangement as your needs change.

What Is a Typical Day Allocation?

Fractional Finance Director engagements in the UK typically run between two and ten days per month, with the most common arrangements sitting in the four-to-six-day range. One day per month is almost always too little to deliver meaningful strategic work — at that level, the FD is barely able to maintain continuity between sessions, let alone drive change. More than twelve days per month begins to approach a three-days-per-week arrangement, at which point a full-time hire may represent better value.

The right number of days for your business depends on a combination of factors:

• The complexity and size of your finance function
• Whether you have an internal finance team (management accountant, bookkeeper, financial controller) or are starting from scratch
• The strategic priorities you need the FD to own versus simply advise on
• Whether you are in a period of significant activity — a fundraise, acquisition, or restructure — or in steady-state operation
• The frequency and depth of board or investor reporting required

Day Allocation by Business Stage

Early-Stage and Pre-Revenue Businesses

Businesses in the early stages of development — typically pre-revenue or generating under £500,000 in annual turnover — often start with two to three days per month. At this stage, the fractional FD's primary contribution is establishing financial foundations: setting up the right accounting structure, building a financial model, supporting R&D tax credit claims, advising on the appropriate corporate structure, and helping founders understand their burn rate and runway. A lean engagement is usually appropriate because the transactional volume is low and the strategic agenda is relatively focused.

Growing SMEs

Businesses with turnover between £1 million and £10 million represent the sweet spot for fractional FD engagements. At this stage, the typical allocation is four to six days per month. The finance function is more complex, reporting obligations are more demanding, and the commercial decisions being made — hiring, capex, new market entry, debt facilities — carry material financial consequences that require proper FD-level oversight. Four to six days provides enough presence for the FD to own the management accounts cycle, attend board meetings, drive strategic projects, and maintain a working relationship with the finance team.

Established Businesses With Complex Finances

Businesses with turnover above £10 million, multiple entities, or complex group structures typically require six to ten days per month. At this scale, the FD is likely overseeing a larger internal team, managing relationships with institutional lenders, supporting audit processes, and driving initiatives such as ERP implementations or acquisition due diligence. The fractional model still delivers significant cost savings over a full-time equivalent, but the engagement is meaningfully more intensive.

The most effective fractional FD engagements we have seen are not defined by a fixed number of days — they are defined by a clear set of outcomes and the FD and client agreeing on the time needed to achieve them.

How Days Are Typically Structured

A common misconception is that a fractional FD's allocated days must be used in rigid full-day blocks. In practice, the arrangement is far more flexible. A four-day-per-month engagement might look like this:

• One half-day reviewing and signing off management accounts with the finance team
• One half-day board meeting attendance and preparation
• One full day working on a specific strategic project (cash flow model, banking covenant review, pricing analysis)
• One full day of ad hoc availability for calls, emails, decisions, and reactive financial queries

The precise structure is agreed between you and your FD based on your business rhythm and the priorities identified during onboarding. Flexibility is a core feature of fractional working, not an afterthought.

Increasing Days for Busy Periods

Most engagements allow for temporary increases to the day allocation when your business enters a period of heightened activity. Fundraising, preparing for an audit, running a sale process, or managing a complex VAT dispute all require more intensive FD involvement than normal operations. FractionalFD engagements are structured to accommodate this — rather than engaging a separate interim FD, your existing fractional FD increases their availability for the duration of the project and then returns to the standard allocation. You can read more about this in our article on increasing FD days for busy periods.