A department budget is a financial plan for a specific organisational unit — such as engineering, marketing, sales, or finance — detailing expected costs by category, headcount requirements, and any revenue the department is directly responsible for. Department budgets are the building blocks of the master budget.
In Depth
Department budgets translate the company-wide plan into actionable targets for individual teams. Each department head owns their budget and is accountable for delivering against it, creating clear lines of financial responsibility throughout the organisation.
A typical department budget includes personnel costs (salaries, NI, pension, benefits, bonuses), software and technology costs, professional services (consultants, legal, audit), travel and entertainment, office and facilities allocation, and any department-specific costs. For revenue-generating departments, it also includes revenue targets and, ideally, a departmental contribution or profit metric.
The FP&A team plays several roles in departmental budgeting: providing templates and guidelines, pre-populating known costs (existing headcount, committed contracts), challenging assumptions, ensuring consistency across departments, and consolidating into the master budget.
Departmental budget reviews are a monthly FP&A ritual. Each department head reviews their actual-vs-budget performance, explains material variances, and confirms or updates their full-year forecast. These reviews are the primary mechanism for financial accountability in most organisations.
For UK businesses, department budgets should include all employment costs at their fully loaded rate — base salary, employer NI (13.8% above threshold), auto-enrolment pension (minimum 3%), and any benefits. FP&A teams typically provide a "cost per head" multiplier to help department heads estimate total people costs accurately.
Real-World Example
A UK SaaS company's marketing department builds its annual budget: 8 FTEs at £485K fully loaded (including employer NI and pension), £320K paid advertising, £80K events and sponsorships, £65K marketing technology stack, £40K content and agency costs, £20K travel. Total: £1.01M. The FP&A team benchmarks this at 18% of revenue — slightly above the 15% industry median — and challenges the events budget where ROI has been unclear.
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