Agency cross-border tax: US retainers, a global freelance bench, and state nexus

US retainers: zero-rated at home, treaty-covered down south

An Ontario agency billing a Chicago client for strategy, creative, and media management is exporting a service: zero-rated for GST/HST, so you charge 0% while keeping every input tax credit on your Canadian costs. Agencies with mostly US revenue usually sit in a permanent refund position, and electing quarterly filing pulls that cash forward instead of lending it to CRA for a year. On the US side, the treaty's business-profits article means no federal income tax without a permanent establishment — the client's procurement team just needs a W-8BEN-E on file so their system does not withhold defensively.

Two wrinkles deserve attention. If a statement of work reads as a licence of intellectual property — transferring content rights for ongoing royalty-style payments — rather than a fee for services, US withholding rules can change, so contract wording matters more than agencies expect. And work performed physically in the US, like a production crew on an LA shoot, is US-source income that starts the treaty analysis rather than skipping it.

The freelance bench: W-9 or W-8 is a sorting problem

A typical agency roster spans three countries, and the payer paperwork follows the person, not the project. The sorting rule is simple: collect a W-9 from US persons and a W-8BEN or W-8BEN-E from everyone else, before the first payment. A Canadian agency with no US trade or business generally has no 1099-NEC filing obligation — that duty belongs to US payers — but the completed forms prove each payee's status if characterization is ever questioned, and they are ready on day one if you later open a US entity that must file.

• Canadian freelancers get a T4A for fees, and their invoices carry HST you recover as ITCs.
• US freelancers working from the US trigger no Canadian withholding and no T4A-NR — the services happen outside Canada.
• Any non-resident working in Canada — a US director flown into Toronto for a shoot — triggers Regulation 105: withhold 15% of the fee and issue a T4A-NR, unless an R105 waiver is approved before payment. This is the one agencies miss, and it surfaces in CRA payroll exams.

One US employee changes your tax map

Hiring a remote account director in New Jersey is a bigger tax event than landing a US client, because states are not bound by the Canada–US treaty. A US-resident employee means registering as an employer in their state, running state income tax withholding and unemployment insurance, and — in most states — creating income or franchise tax nexus that brings filing obligations even while your federal treaty position holds. Federally, an employee with authority to conclude contracts can create a permanent establishment all by themselves. None of this argues against hiring in the US; it argues for choosing the structure before the offer letter goes out.

Keeping the Canadian books honest under USD

Cross-border revenue makes agency books harder in ordinary ways. USD retainers convert at the rate when earned, and the gap between invoicing and collection creates FX gains and losses that belong in the P&L, not in a suspense account. Project accounting should live in one reporting currency so margin by client is comparable — a US retainer is not automatically your best account just because the number is bigger. Zero-rated sales still get reported on the GST/HST return, and the freelancer forms above only help if they are attached to the vendor record, not a partner's inbox. Our agency bookkeeping service builds this into the monthly close, and the cross-border layer — W-8 registers, Reg 105 tracking, protective US filings when travel patterns justify them — sits on top with fixed fees quoted after a discovery call.

Source: IRS — About Form W-9.