Management consultant bookkeeping: books that track WIP, not just cash in the door

Retainer, project, or both — keeping WIP honest

Most consulting practices run at least two billing models at once: a monthly retainer for ongoing advisory work and fixed-fee or milestone projects layered on top. The bookkeeping problem is timing — a retainer client pays on the first of the month regardless of hours delivered, while a project client's invoice lands only when a milestone closes, sometimes weeks after the work was done. Work-in-progress (WIP) is the bridge: unbilled hours and undelivered milestones tracked separately from invoiced revenue, so your monthly numbers reflect what was actually produced, not just what happened to be billed that week.

This is not a tax election — that WIP deferral only ever applied to a defined list of professionals under the Income Tax Act, and consultants are not on it. It is purely an operating discipline, and it is the difference between "we had a great month" and knowing whether a specific engagement is actually profitable.

Rebilled expenses: HST usually rides along with the fee

Travel-heavy consulting means client-site flights, hotels, and mileage that get rebilled on the next invoice. The common mistake is treating a rebilled expense as a pass-through with no tax consequence. CRA's general position is that a reimbursed cost is part of the consideration for your taxable supply of services, so it typically carries the same HST as your fee — even though you already paid HST once when you booked the hotel. A true agency disbursement, made strictly as the client's agent for a specific identifiable third-party cost, is a narrow exception and worth setting up deliberately rather than assuming it applies.

Out-of-province engagements add a second layer: the HST or GST rate you charge follows the client's business address, not your own, so a Calgary engagement is billed at 5% GST even though your invoice originates in Brampton. We code disbursements and place-of-supply rates as separate line items so both are visible on review, not buried inside a single fee total.

Subcontracted associates: T4A tracking starts at the first invoice

Surge capacity usually comes from independent associates brought in for a specific engagement rather than new hires. Their invoices need to flow through a vendor ledger built for year-end from day one — CRA requires a T4A for fees for services paid over $500 in a calendar year, and reconstructing twelve months of associate payments in January is exactly the kind of task that turns a quick year-end into a slow one. We track associate costs against the engagement they support, so the WIP picture includes their time and the T4A total reconciles itself.

• Associate invoices coded to the client engagement, not a general subcontractor expense line, so margin per project stays visible.
• A running T4A total per associate, updated monthly rather than assembled from twelve months of statements in January.
• Contracts on file confirming the associate invoices as an independent business, which matters if CRA ever questions the classification.

What the monthly close actually looks like

We run this on QuickBooks Online or Xero with bank feeds, Dext capturing travel and client-site receipts from your phone, and a chart of accounts organized by engagement rather than by expense type alone. Each month we reconcile invoiced revenue against WIP, code disbursements and associate costs to the right client, and confirm the HST return reflects the mix of Ontario, other-province, and any zero-rated foreign work.

The output is a one-page view: revenue and cost by engagement, WIP outstanding, and the associate spend feeding next year's T4A run. That same structure is also the evidence base your accountant needs if a one-client year ever raises a personal services business question — see our tax services page for how that risk is actually assessed and managed.

We also keep an eye on the shareholder loan account, which tends to drift in consulting practices where the owner draws against a strong project month and repays it during a slower one. Left unreviewed, a growing balance can trigger an unexpected income inclusion at year-end. Reviewing it monthly, alongside WIP and the HST position, means year-end is a confirmation of numbers you have already seen — not a scramble to explain them.