Quick Answer
To price an agency retainer profitably in the UK, calculate your fully-loaded team cost (salary plus employer NIC at 15% plus pension plus overhead), divide by your target billable hours at 70% utilisation, then add a 50-60% gross margin. Pricing from salary alone understates your true cost by around 30%, which is why many retainers look profitable until the management accounts arrive.
How to Price Agency Retainers UK: Why the Standard Approach Falls Short
Most agency founders price retainers one of two ways: they estimate how many hours the client needs, multiply by their day rate, and round up slightly. Or they look at what competitors charge and match it. Both approaches consistently produce under-priced retainers, because neither accounts for the full cost of delivering the work or for the hours your team is employed but not billing to any client.
When we review agency management accounts, under-priced retainers are one of the most common causes of lower-than-expected net profit. The tell-tale sign is a client generating respectable revenue but thin or negative gross margin. It is usually a long-standing client whose retainer was set years ago and never repriced as salaries and employer National Insurance increased.
The three-step method below replaces guesswork with a calculation you can run in under 20 minutes and revisit each time you add headcount, agree a pay rise, or renew a retainer contract. If you want to understand the different retainer structures available before pricing them, the retainer pricing models guide covers fixed-fee, time-bank, value-based, and hybrid approaches.
Step 1: Calculate Your Fully-Loaded Cost Per Fee-Earner
The starting point is your true cost per team member, not just their gross salary. For a UK agency in 2026/27, the components are:
- Gross salary: the amount before any deductions
- Employer National Insurance: 15% on earnings above the secondary threshold of £5,000 per year for 2026/27, as set out in GOV.UK employer rates and thresholds
- Employer pension: minimum 3% on qualifying earnings under auto-enrolment
- Overhead allocation: a proportional share of rent, software subscriptions, management time, training, and any other costs that are not directly attributable to a single client
Example: fully-loaded cost for a mid-level content executive (£36,000 salary)
| Component | Annual cost |
|---|---|
| Gross salary | £36,000 |
| Employer NIC (15% on £31,000) | £4,650 |
| Employer pension (3%) | £1,080 |
| Overhead allocation | £9,500 |
| Fully-loaded annual cost | £51,230 |
The overhead allocation covers a proportional share of rent, software, management time, and general running costs. For a small to mid-size agency, £8,000-£12,000 per head is a reasonable starting figure.
The overhead allocation is where most agencies under-estimate. Software licences alone add up quickly: project management tools, design platforms, reporting dashboards, CRM, Slack, and any client-specific tools. Add management time (directors reviewing work, leading pitches, handling finance and HR), and the true overhead per fee-earner is typically £8,000-£12,000 per year even for a lean 10-person agency.
If you claim the Employment Allowance (£10,500 from April 2026 for eligible employers), that reduces your total NIC bill, but it does not change the per-person calculation above. The per-person fully-loaded cost is the right basis for pricing individual retainers.
Step 2: Adjust for Utilisation (the Step Most Guides Skip)
Fully-loaded cost gives you what a fee-earner costs for all the hours they are employed: internal meetings, admin, new business pitches, training, and genuinely billable time. But retainers only pay for billable hours. If your team is 70% billable (a typical target for healthy agencies), then 30% of their employed time is not covered by any client fee.
To price correctly, divide your fully-loaded annual cost by your expected billable hours, not by total working hours.
Utilisation calculation
Working hours per year: approximately 1,850 (225 working days at 7.5 hours, after holiday and bank holidays)
Target utilisation: 70%
Billable hours: 1,850 × 70% = 1,295 hours per year
Effective hourly cost (content executive example): £51,230 ÷ 1,295 = £39.56 per hour
Naive calculation without utilisation adjustment: £51,230 ÷ 1,850 = £27.69 per hour. The difference compounds across every retainer you price.
For most UK agencies, a target utilisation rate of 70-75% is the right range to price from. Below 60% suggests too much non-billable time and is a business efficiency issue to address separately. Above 80% leaves no capacity for new business, training, or unexpected demands from existing clients, and tends to lead to burnout and staff turnover. For more on how to measure and improve utilisation, the agency utilisation rate guide covers the calculation in detail.
Step 3: Add Your Target Gross Margin
With your effective hourly cost calculated, the final step is to add your gross margin target. For UK agencies, the target gross margin on service delivery is typically 50-60%. The formula is:
Minimum retainer price = (effective hourly cost × hours per month) ÷ (1 − gross margin target)
Example at 55% gross margin: (£39.56 × 20 hours) ÷ (1 − 0.55) = £791 ÷ 0.45 = £1,758/month
A 50-60% gross margin on retainers covers the overhead that sits above the per-person allocation (central finance, senior management time, marketing, occupancy costs not captured in the per-head figure), generates net profit, and provides a buffer for scope creep and sick leave. Below 40% gross margin, most agencies find they are working very hard to break even after overhead. Above 65% is achievable on highly specialised retainers where your expertise commands a premium. For a fuller picture of where gross margin sits within your agency P&L, the agency profitability guide covers the relationship between gross margin, overhead, and net profit.
A Worked Example: How to Price a UK Agency Retainer from Scratch
A 12-person digital agency is quoting a new content marketing retainer for an e-commerce client. The retainer will draw on three team members: a senior strategist (£60,000 salary), a content executive (£36,000 salary), and an account manager (£30,000 salary).
Step 1: Fully-loaded annual cost per person
| Role | Salary | NIC | Pension | Overhead | Total |
|---|---|---|---|---|---|
| Senior strategist | £60,000 | £8,250 | £1,800 | £11,000 | £81,050 |
| Content executive | £36,000 | £4,650 | £1,080 | £9,500 | £51,230 |
| Account manager | £30,000 | £3,750 | £900 | £9,000 | £43,650 |
NIC calculated at 15% on earnings above the £5,000 secondary threshold. Pension at 3% of gross salary.
Step 2: Effective hourly cost at 70% utilisation
| Role | Annual cost | Billable hrs | Eff. hourly cost |
|---|---|---|---|
| Senior strategist | £81,050 | 1,295 | £62.58 |
| Content executive | £51,230 | 1,295 | £39.56 |
| Account manager | £43,650 | 1,295 | £33.71 |
Step 3: Monthly delivery cost and retainer price
Monthly hours: 8 hrs (senior) + 25 hrs (content exec) + 7 hrs (account mgr) = 40 hours
| Role | Hours | Eff. hourly cost | Monthly cost |
|---|---|---|---|
| Senior strategist | 8 | £62.58 | £501 |
| Content executive | 25 | £39.56 | £989 |
| Account manager | 7 | £33.71 | £236 |
| Total monthly delivery cost | 40 | £1,726 | |
| Retainer price at 50% gross margin (£1,726 ÷ 0.50) | £3,452/month | ||
| Retainer price at 55% gross margin (£1,726 ÷ 0.45) | £3,836/month |
Quote range: £3,500-£3,900/month. Anything below £3,000 is losing money at these salary levels.
How to Audit an Existing Retainer Against Your Management Accounts
If you have retainers already running, the acid test is to run this calculation for each one and compare the result to what you are currently charging. Pull your time-tracking data for the last three months. Calculate the actual hours delivered per role. Apply the effective hourly cost formula. Compare the total monthly delivery cost to the retainer fee.
Three outcomes are typical:
- You are charging above the minimum viable price: the retainer is healthy. Review annually to ensure salary increases have not eroded the margin.
- You are roughly at the minimum: the retainer covers costs but leaves little margin. Any scope creep, a senior hire, or a pay rise puts you under water.
- You are below the minimum: you are delivering this retainer at a loss. This is more common than most agency founders realise, particularly on clients who have been with the agency for two or more years without a price review.
The most effective way to run this audit is within your management accounts, where you can see gross margin by client or by cost centre. If you do not have monthly management accounts set up, the guide to reading a profit and loss statement explains how to read the key lines. The agency profitability calculator can help you run the numbers before you have formal management accounts in place.
When to Reprice and How to Handle Scope Creep
Review every retainer against your management accounts at least once a year. If salaries have increased, employer NIC has risen (15% from April 2026 compared to 13.8% previously), or overhead has grown, the margin on existing retainers will have compressed even if the scope has stayed the same.
When repricing, prepare a short summary of what was delivered during the term and any results achieved. Present the updated pricing at least 60 days before the renewal date with a clear explanation of the cost drivers. Clients rarely leave over a well-justified and properly communicated price increase.
Scope creep is the other margin drain. An agency with 10 retainers each absorbing three untracked hours per month is losing 360 hours a year of billable time. At an effective hourly cost of £40-£50, that is £14,400-£18,000 in unrecovered cost annually. Log everything, and define scope explicitly in every retainer contract: deliverables, number of revisions, response times, and what triggers a change request. For a deeper look at how scope creep affects agency profitability at the project and client level, the scope creep and profitability guide covers the tracking and recovery process in detail.
Target Agency EBITDA Margin
Healthy profitability range for UK marketing agencies
Optimal Agency Utilization Rate
Target billable hours as % of total available hours
Target Overhead Ratio
Overhead costs as % of revenue
How Alto Accounting Can Help
Alto Accounting works exclusively with UK agencies. We set up management accounts that show gross margin and net profit by client, so you can see which retainers are healthy and which need repricing before the gap becomes a problem. We also help with annual retainer reviews, salary benchmarking, and structuring your P&L so that utilisation and delivery costs are visible at a glance.
Book a free consultation to speak with a specialist who understands how agencies price, staff, and scale.
Frequently Asked Questions
How much should I charge for an agency retainer in the UK?
The right price depends on your team costs, utilisation, and target margin, not competitor benchmarks. Calculate your fully-loaded cost per fee-earner (salary plus employer NIC plus pension plus overhead), divide by your expected billable hours at 70% utilisation, then divide by 0.45 to hit a 55% gross margin. UK agencies typically quote retainers from £1,500 to £10,000 per month depending on team size and scope, but the floor should always be set by your own cost structure.
What is a fully-loaded cost and why does it matter for retainer pricing?
Fully-loaded cost is everything it costs to employ someone beyond their gross salary: employer National Insurance (15% on earnings above £5,000 per year from April 2026), employer pension (at least 3% under auto-enrolment), and an overhead allocation covering rent, software, management time, and other costs that cannot be pinned to a single client. For a fee-earner on a £40,000 salary, the fully-loaded cost is typically £54,000 to £62,000 per year. Pricing retainers from salary alone understates your true cost by 30% or more.
What utilisation rate should I use when pricing a retainer?
Use your actual or target utilisation rate: the percentage of available working hours that fee-earners spend on billable client work. For most UK agencies, a healthy target is 70-75%. Below 60% indicates too much non-billable time; above 80% risks burnout and leaves no capacity for new business. If you are pricing a new retainer and have no historical data, use 70% as a conservative starting assumption.
What gross margin should I target on agency retainers?
Target 50-60% gross margin on retainers. At 55% gross margin, for every £1,000 of retainer revenue, £450 covers direct delivery costs and £550 is gross profit to fund overheads, growth, and net profit. Below 40% gross margin, there is typically not enough left after overhead to generate acceptable net profit. Above 65% is achievable on highly specialised or value-based retainers.
How do I calculate a blended day rate for my agency?
Take the effective hourly cost for each team member who will work on the retainer (fully-loaded annual cost divided by billable hours at your target utilisation), multiply each by their hours per day, then weight by the proportion of retainer hours each person contributes. A simple blended approach: add the monthly delivery cost across all team members, divide by the total hours per month, and multiply by your day length (typically 7.5 hours). That gives your blended cost day rate. Add your gross margin to get your billable day rate.
How often should I review and reprice retainers?
Review every retainer against your management accounts at least once a year. Pull the actual hours logged over the last three months, apply your current effective hourly cost, and compare the result to the fee. If your real costs have risen (salary increases, higher NIC from April 2026, inflation on software and overheads) while the retainer price has stayed flat, the margin is eroding. Build an annual review clause into your retainer contracts so clients expect it and it does not feel like a surprise.
What should I do if an existing retainer is under-priced?
Run the calculation to quantify the gap between what the retainer costs you and what you are charging. If the gap is large, consider a phased repricing over two renewal cycles rather than a single jump. Present the client with a concise summary of what was delivered and any results achieved, then propose the updated price with 60 days notice. In our experience, clients rarely leave over a well-justified price increase. The ones who do were almost always not profitable to begin with.
How do I handle scope creep in a retainer so it does not erode margin?
Log every hour against each retainer and review monthly against the agreed scope. If ad-hoc requests are consistently running over the agreed allocation, raise it with the client before the end of the quarter, not at renewal. Define scope clearly in your contract: specific deliverables, number of revisions, and response time commitments. Anything outside that scope should go through a change request, even if the extra work is small. An agency with 10 retainers each absorbing three hours of untracked scope creep per month is losing 360 hours a year of billable time.