Agency margins: why your P&L is lying to you

taxifi team · Reviewed by a Canadian accountant · June 2026 · 5 minute read · All resources

Most agency owners can quote their revenue and very few can quote their margin, and it is usually not their fault: the standard agency P&L is built in a way that hides it. Three distortions do most of the damage.

Distortion one: pass-through ad spend

Client media dollars run through your cards, land in revenue, and come back out as expenses. A shop billing $150K a month where $90K is Meta and Google spend is a $60K-a-month business wearing a $150K costume. The inflated top line feels good and wrecks every ratio computed from it; your real margin is a percentage of money you actually earn.

The fix is bookkeeping, not strategy: pass-through spend recorded against the client, not in your revenue and not in your costs. Once it is separated, you can finally see what each account costs to serve, including the ones spending the most of your team's patience.

Distortion two: freelancers hiding in overhead

Salaried staff sit in payroll. Freelancers tend to land wherever the bookkeeper put them three years ago, often in a generic contractors line in overhead. But the freelance editor on a client project is a delivery cost, the same as an employee doing identical work, and when freelance costs hide in overhead, every project looks more profitable than it is. Map contractor spend to the work it delivered, and as a bonus, your T4A season becomes a sorted list instead of a hunt.

Distortion three: retainer timing

A retainer invoiced in January for work delivered through March is not January revenue, but cash-basis books say it is. The result is a P&L that swings between fake great months and fake terrible ones, and an owner who cannot tell whether the business is actually growing. Recognize retainer revenue in the months it is earned and the noise disappears; the trend line that remains is the one you can hire against.

The report that matters

Fix those three and a one-page monthly view becomes possible: earned revenue, delivery costs including freelancers, gross margin, overhead, profit. Margin by month, honestly stated, is the single number that tells an agency whether pricing is keeping up with costs, and it is only available from books that are current and categorized consistently, which is to say, not from a shoebox in April.

This is the bookkeeping taxifi does for creative firms every day, with an accountant signing off on the month: accounting for marketing & creative firms.