What Is Included in a Part-Time FD Monthly Retainer?

A monthly FD retainer fee covers a defined scope of strategic financial leadership delivered by a part-time Finance Director over an agreed number of days per month. Understanding exactly what is — and is not — included in that fee is essential for setting clear expectations, avoiding scope disputes, and ensuring the engagement delivers genuine value from day one.

This guide sets out what a well-structured FD retainer typically includes, what usually falls outside the standard scope, and how to negotiate a scope that fits your business.

What a Standard FD Retainer Typically Includes

A monthly retainer for a fractional Finance Director working two to four days per month with a growing UK SME typically covers the following activities:

• Monthly management accounts review: The FD reviews management accounts prepared by your finance team or bookkeeper, challenges the numbers, and provides a board-ready narrative commentary explaining variances against budget and prior year.
• Cash flow forecasting and monitoring: Maintaining a rolling 13-week cash flow forecast, identifying funding gaps in advance, and advising on working capital management strategies to protect liquidity.
• Board meeting attendance and preparation: Attending monthly or quarterly board meetings as the senior finance voice, presenting financial performance, and contributing to strategic decisions with a financial lens.
• KPI development and reporting: Designing and maintaining a suite of financial and operational KPIs that give the board actionable insight, beyond the basic profit and loss statement.
• Budgeting and annual planning: Leading the annual budgeting process, coordinating input from department heads, and building a financial plan that connects to strategic objectives — typically included in full-year retainer packages rather than billed as a project add-on.
• Banking and lender relationships: Managing the day-to-day relationship with your bank, responding to covenant reporting requirements, and advising on facility structures when renewals or new facilities are required.
• Finance team oversight and mentoring: Providing direction and technical mentoring to your in-house finance manager or management accountant, raising the capability of your team over time.
• Ad hoc commercial analysis: Responding to specific business questions — a pricing decision, a make-or-buy analysis, a customer profitability review — within the agreed monthly day allocation.
• HMRC and Companies House compliance oversight: Ensuring your statutory obligations are met on time, liaising with external auditors and tax advisers, and flagging upcoming deadlines. Note this does not typically include preparing tax returns, which remains the responsibility of your external accountant.

What Is Usually Excluded from the Monthly Retainer

A clearly scoped retainer is as important for what it excludes as for what it includes. The following activities typically fall outside a standard retainer and would be scoped separately or billed at an additional day rate:

• Preparing statutory accounts or tax returns: This is the domain of your external chartered accountant. The FD may liaise with them and review outputs, but the preparation work is separate.
• Fundraise or M&A transaction support: Intensive transaction support — preparing an information memorandum, managing investor due diligence, or leading a sell-side process — typically requires dedicated project time beyond the retainer.
• Finance system implementation or migration: Selecting and implementing a new finance system is a discrete project with its own scope, timeline, and resource requirement.
• Payroll processing: Payroll operations are an accounting function managed by your finance team or an outsourced payroll bureau, not the FD's role.
• Legal advice: The FD can identify when legal input is required and coordinate with your solicitors, but legal advice itself is out of scope.

How Day Allocation Shapes the Scope

The scope of activities practically deliverable under a retainer is directly constrained by the number of days committed per month. A one-day retainer provides narrow, focused support — typically cash flow monitoring and board pack review. A four-day retainer enables a genuinely transformative engagement covering all the activities listed above.

One to two days per month

At one to two days per month, a fractional FD typically focuses on reviewing management accounts, attending the board meeting, and providing reactive support on critical finance questions. This level suits businesses under £2m turnover with a capable bookkeeper or accounts assistant in place.

Three to four days per month

At three to four days per month, the FD moves from reactive to proactive leadership. They can own the cash flow forecast, lead the budgeting process, develop the KPI framework, mentor the in-house team, and manage external relationships with the bank, auditors, and HMRC. This is the level most growth-stage businesses of £2m–£10m turnover benefit from most.

What Should a Retainer Agreement Document Clearly?

A well-drafted retainer agreement should specify each of the following to avoid ambiguity:

1. The committed number of days per month and how unused days are treated (rolled over, lost, or credited)
2. The process for requesting additional days above the retainer — agreed day rate and notice period
3. Which activities are in scope and which require a separate project fee
4. Whether on-site attendance is included or whether all work is delivered remotely
5. Expense policy — travel, subsistence, and any software costs
6. Notice period for termination or scope changes
7. Escalation process if deliverables are not met

"The best retainer agreements read like a partnership charter. They set out shared expectations clearly enough that both parties feel confident, without being so prescriptive they become a constraint on doing good work."

For a clear understanding of what additional costs can arise beyond the retainer fee, see our guide on hidden costs and additional fees to watch for in a fractional FD engagement.

How to Negotiate a Retainer Scope That Fits Your Business

Start with an honest assessment of your current finance capability. If you have a competent Finance Manager who produces accurate management accounts, your FD's time is best spent on analysis, strategy, and external relationships rather than reviewing the numbers. If your finance function is less developed, the FD may need to invest time building the foundations before strategic work is possible.

Build your retainer scope around three to five specific outcomes you want to achieve in the first six months — not a list of tasks, but genuine business results. A cash flow forecast that gives you 90-day visibility. A budget that your department heads own. A banking relationship that is proactive rather than reactive. A fractional FD engaged against clear outcomes will deliver more than one engaged against a vague job description.

For more on pricing structures and how different models compare, read our article on how fractional FDs charge — by the day, retainer, or project, and our comparison of fixed price versus variable FD pricing.