3 Best Practices for Cost Allocation in Marketing Agencies in the UK

Your strategic partner

October 30, 2025

Picture this: your marketing agency is buzzing with campaigns, but costs are piling up unpredictably, eating into profits and client relationships. For UK agencies, mastering cost allocation is key to staying profitable amid tight regulations and fierce competition. In this piece, explore three game-changers: activity-based costing for precise tracking, client-specific models for true fairness, and regular audits to nail compliance. Ready to allocate smarter?

1. Implement Activity-Based Costing (ABC) for Accurate Tracking

Markting campaigns may look profitable but end up costing more than expected. This happens because shared costs, like office expenses, are not tracked well. Activity-Based Costing (ABC) helps track these costs accurately.

a) Start by listing main cost causes, like time on design or client meetings. Note them in a spreadsheet with totals, such as £4,000 in monthly shared costs.

b) Next, map these activities to specific projects. Use Toggl to log time per campaign—for example, 20 hours spent on social adverts for Client A.

c) In QuickBooks, go to 'Chart of Accounts' > 'New' to create dedicated ABC categories. Then, import your Toggl data via integration for seamless tracking.

d) Allocate costs proportionally across activities. For example, if adverts represent 40% of overall activity, assign £2,000 in overhead to that category.

e) Verify the accuracy with a sample calculation: total project cost equals direct expenses (£3,000) plus allocated indirect costs (£2,000), totalling £5,000. Compare this figure to revenue for a clear view of true profitability.


This setup takes 2-3 hours to implement and will quickly show hidden costs in your operations.

2. Adopt Client-Specific Allocation Models to Ensure Fairness

A mid-sized UK marketing agency lost a big client because the client felt the bill included too many shared costs from another client's paid search ads. This caused issues: Echo Strategies in London lost £50,000 in revenue, team morale dropped from arguments, and hidden costs violated clear billing rules from the UK Advertising Standards Authority.

The agency then used cost allocation models for each client. They tracked time in departments like creative and media using tools like Harvest. They also used pricing based on value, following guidelines from the Institute of Chartered Accountants in England and Wales (ICAEW), with 20% added to costs for results like 15% higher client sales. This approach restored client trust, recouped 80% of the lost revenue within six months, reduced the emotional toll on the team, and created a more collaborative environment.

3. Conduct Regular Audits and Compliance Checks Under UK Regulations

Not following UK financial rules is more than paperwork. It is a big risk for agencies handling client money and ad buys.

To address these risks, agencies can explore various audit methods, each balancing trade-offs in terms of cost, time, and alignment with UK tax rules, value-added tax (VAT) requirements, and financial reporting standards (FRS 102). Here's a comparison:

Approach Pros Cons
Internal Reviews Low cost (£0–£5k/year, staff time); quick (weekly checks); strong adherence to UK tax rules, VAT, and FRS 102 using in-house knowledge. Limited objectivity; time-intensive for complex media buys; potential bias in client fund tracking.
External Audits by Certified Accountants High adherence to FRS 102, UK tax rules, and VAT directives (e.g., quarterly filings); thorough for trust accounts. High cost (£10k–£50k annually); lengthy (months per cycle); disrupts operations.
Automated Compliance Software (e.g., Xero or Sage) Affordable (£500–£5k/year); fast real-time monitoring of VAT and UK tax compliance; integrates FRS 102 reporting. Initial set-up time (1–2 weeks); relies on accurate data input; less nuanced for bespoke agency finances.

Choose the approach that fits your agency's scale—internal reviews work well for start-ups, external audits suit those with high-volume clients, and software provides efficiency for most operations. For more details, see guidance from the Institute of Chartered Accountants in England and Wales (ICAEW) on financial reporting at icaew.com.