HR consultant cross-border tax: billing US clients and paying a global specialist bench

Billing US clients: zero-rated at home, treaty-protected abroad

Fractional-HR retainers and search fees billed to a US client are generally an export of services — zero-rated for GST/HST, so you charge 0% while still recovering input tax credits on your Canadian costs. On the US side, the treaty's business-profits article means no US federal income tax without a US permanent establishment, but the client's payment system does not know that automatically. A completed W-8BEN-E on file before the first invoice is what stops the client's accounts payable software from applying default 30% withholding. A related question worth checking early is whether the US client will issue a 1099 to your corporation at all — generally they should not, once the W-8BEN-E establishes your foreign status, but it is worth confirming rather than discovering a mismatched form at tax time.

The specialist bench: sorting W-9 from W-8 before the first payment

A bench that includes US-based compensation analysts or HRIS specialists needs the same paperwork sorting any cross-border payer needs: a W-9 from US persons, a W-8BEN from everyone else, collected before the first invoice is paid. Since your firm is a Canadian payer with no US entity, you generally have no obligation to issue 1099s yourself — that duty sits with US-based payers — but the completed forms document each specialist's status and are ready immediately if the firm later opens a US entity that does have to file.

• US-based specialists paid from Canada trigger no Canadian withholding or T4A-NR, since the work happens outside Canada.
• Any non-resident specialist working physically in Canada — flown in for an on-site engagement — can trigger Regulation 105 withholding and a T4A-NR, a detail easy to miss on a one-off project.
• Canadian specialists stay on the standard T4A track regardless of which client's project they support.

Advising on cross-border hiring: a real service line, priced like one

HR consulting firms increasingly get asked to help a Canadian client hire in the US, or a US client hire in Canada — sorting employer-of-record options, contractor-versus-employee classification across the border, and the paperwork each direction requires. This is a legitimate, billable advisory service in its own right, distinct from your own firm's cross-border paperwork above, and worth pricing as one rather than folding it quietly into a broader HR retainer. It is also advisory work, not legal or tax filing work — the actual entity setup, payroll registration, or tax positions still belong with counsel and an accountant licensed in the relevant jurisdiction, and engagement letters should say so plainly.

Firms building this into a repeatable offering usually keep a simple reference sheet of what changes state to state or province to province, since the answer for a client hiring in California looks nothing like the answer for one hiring in Texas, and neither looks like the reverse case of a US client hiring in Ontario.

Keeping the books honest under two currencies

USD retainers and placement fees convert to CAD at the rate on the invoice or receipt date, and the resulting FX gain or loss belongs in the profit-and-loss statement rather than a suspense account. Placement guarantee reserves tracked in USD need the same currency discipline as the revenue itself, so a reserve calculated in one currency and reversed in another does not quietly misstate the guarantee liability. Our bookkeeping service for HR consulting firms builds this into the monthly close, with the cross-border layer — W-8 and W-9 registers, zero-rated GST/HST filings, and Regulation 105 tracking — sitting on top with fixed fees quoted after a discovery call.

A refund position and a foreign-property filing worth checking

A firm billing mostly US clients often ends up in a permanent GST/HST refund position, since input tax credits on Canadian costs keep flowing while sales sit at zero-rated. Electing quarterly filing instead of annual pulls that refund forward instead of lending the cash to CRA for months at a time. Separately, if the corporation holds a USD bank account or outstanding US receivables with a combined cost above $100,000 CAD at any point in the year, a T1135 foreign income verification return becomes required alongside the T2 — a filing growing US-facing practices can trigger without realizing it, since the threshold is based on cost, not on how much of it is actually collected yet.

Source: IRS — About Form W-9.