Marketing agency bookkeeping: real margin behind retainers and media spend

Media spend: gross or net decides your whole P&L

The first question in agency bookkeeping is whether you buy media as principal or manage it as your client's agent — and the answer decides whether ad spend is your cost of sales or never touches your income statement at all. Getting it wrong in either direction misstates revenue, margins, and HST.

An agency that books pass-through media as revenue looks bigger than it is — until a lender, a buyer, or a CRA auditor normalizes the numbers. Note also that Google and Meta now bill Canadian advertisers with GST/HST on top, and those ITCs belong to whoever actually incurred the spend; we make sure they land on the right side of the clearing account.

Retainers and projects: revenue when it is earned, not when it is invoiced

A retainer is earned in the month you deliver it, a prepaid quarter is a liability until you do, and a project billed 50% up front is not half earned on day one. We keep a running deferred revenue schedule for prepayments and recognize project income as milestones actually ship, so a slow delivery month cannot hide behind aggressive invoicing.

The mirror image is WIP — campaigns built but not yet billed. A month-end WIP entry gives heavy production months the revenue they earned and stops the P&L from whipsawing between billing cycles. For agencies this is also the honest basis for pricing: if a retainer account consumes double the hours it did last quarter, the books should be the first place that shows it.

Freelancer costs, allocated to the client they served

Agencies run on freelancer networks, and account profitability usually dies in one undifferentiated contractor expense line. We tag every freelancer invoice to the client and project it served — QuickBooks Online projects or classes, with time data from Harvest or a similar tracker — so each account carries its true delivery cost, not a blended average.

The compliance layer rides along: unincorporated Canadian freelancers may need T4A slips for fees paid, which requires clean vendor records all year, not a January scramble. Paying US-based freelancers raises W-9 and W-8 questions, and US client revenue is generally zero-rated for GST/HST — both sides of that border story are covered in our cross-border tax guide for agencies.

The agency month-end: five closes that keep the numbers honest

Each month we reconcile receivables and flag aging retainer invoices, roll the deferred revenue schedule forward, clear the media pass-through account to zero, post the WIP entry, and produce margin by client — fee revenue minus freelancers and allocated delivery cost. That last report is the one owners actually use: it shows which accounts fund the agency and which ones quietly consume it.

Because everything is tagged at entry, the close is fast and the year-end is quiet: HST reconciled monthly, T4A data ready, and financials a bank or acquirer can read without adjustment. Our bookkeeping services page explains how this monthly rhythm works across every client we serve.