Most agency founders I meet have never been shown how to read their own P&L. They look at the bottom line, see a positive number, and assume everything is fine. Then they wonder why the bank balance doesn't match the profit figure.
That gap between profit and cash is where agencies fail. And it starts with not understanding what the P&L actually tells you.
This is agency finance basics. The kind of knowledge that separates founders who build sellable businesses from those who burn out running expensive jobs.
I'm going to walk through a real P&L for a 12-person digital agency billing £800,000 per year. Every line. What it means. What to look for. And what the numbers tell you about the health of your agency.
What a P&L Actually Is
The profit and loss statement (P&L) measures performance over a period. Usually a month, a quarter, or a year. It shows revenue, costs, and the resulting profit or loss.
It does not show cash. That is the single most common misunderstanding I see.
Your P&L might show a £50,000 profit for the year while your bank account shows £5,000. That is normal if you have unpaid invoices, prepaid expenses, or loan repayments. The P&L and the balance sheet work together. One without the other is a half picture.
For agency finance basics, start with the P&L. Learn it first. Then add the balance sheet and cash flow statement later.
The P&L Structure: Top to Bottom
Every P&L follows the same structure. Revenue at the top. Costs deducted in order. Net profit at the bottom. The detail between those points is where the story lives.
Revenue (Turnover)
This is the total value of work you invoiced during the period. Not cash received. Invoiced.
For our example agency:
- Retainer income: £480,000 (60% of total)
- Project income: £240,000 (30%)
- Pass-through costs (ad spend, print, licences): £80,000 (10%)
- Total revenue: £800,000
Pass-through costs are money that flows through your agency to third parties. Media spend. Print production. Software licences you buy and resell. You should separate these from your own revenue because they inflate your turnover without adding profit.
An agency billing £800,000 with £200,000 in pass-through costs is really a £600,000 agency. The P&L should show pass-through costs as a separate line or within cost of sales, not buried in revenue.
Cost of Sales (Direct Costs)
These are costs directly tied to delivering the work. For an agency, that means:
- Staff salaries for delivery teams
- Freelancer costs
- Subcontractor fees
- Software tools used directly on client projects (e.g. Figma, Adobe Creative Cloud, SEMrush)
- Pass-through costs (if not shown separately)
Our example agency:
- Delivery team salaries (8 people): £320,000
- Freelancers: £48,000
- Direct software costs: £12,000
- Pass-through costs: £80,000
- Total cost of sales: £460,000
Gross Profit and Gross Margin
Gross profit is revenue minus cost of sales. Gross margin is that number expressed as a percentage of revenue.
Gross profit: £800,000 - £460,000 = £340,000
Gross margin: £340,000 ÷ £800,000 = 42.5%
A 42.5% gross margin is low for a digital agency. Most healthy agencies sit between 50% and 65%. Below 45% and you are either undercharging, over-staffing projects, or carrying too many non-billable people in your delivery team.
If your gross margin is below 50%, look at three things:
- Are your project scopes tight enough? Scope creep kills margins.
- Are you using too many freelancers at rates that wipe out your markup?
- Are you including pass-through costs in your revenue calculation? If so, recalculate without them.
Excluding pass-through costs, our example agency's gross margin is £260,000 ÷ £600,000 = 43.3%. Still low. There is work to do here.
Overheads (Operating Expenses)
These are the costs of running the agency that are not tied to specific projects. Every agency has them. The question is whether they are proportionate.
Our example agency overheads:
- Management salaries (director, ops, finance): £120,000
- Office rent (Manchester Northern Quarter): £24,000
- Software (Xero, Dext, Float, Slack, Notion, Google Workspace): £18,000
- Marketing and business development: £15,000
- Professional fees (accountant, legal, insurance): £12,000
- Travel and entertainment: £8,000
- Training and development: £5,000
- Other (IT, phones, subscriptions, bank fees): £10,000
- Total overheads: £212,000
Overheads as a percentage of revenue: £212,000 ÷ £800,000 = 26.5%. That is reasonable for a 12-person agency. Most well-run agencies sit between 20% and 30%. If you are above 35%, you have structural costs that need addressing.
Look at your own overheads and ask: does every line item directly support revenue generation or compliance? If not, cut it.
Operating Profit (EBITDA)
This is gross profit minus overheads. It tells you what the agency earns from its core operations before interest, tax, depreciation, and amortisation.
Operating profit: £340,000 - £212,000 = £128,000
Operating margin: £128,000 ÷ £800,000 = 16%
A 16% operating margin is decent but not great. For a well-run agency, I want to see 20% or higher. That gives you room to invest, save for tax, and build a buffer.
If your operating margin is below 10%, your agency is fragile. One bad month or one client loss could tip you into a loss.
Other Income and Costs
Below operating profit, you will see:
- Interest income (bank interest on savings)
- Interest expense (loan or overdraft costs)
- Depreciation (spreading the cost of assets like laptops and office furniture over their useful life)
- Amortisation (same for intangible assets like goodwill or software development costs)
For our example: