Cross-border plumbing from Ottawa and Gatineau: the Vermont case

What to take away

What cross-border work from Ottawa and Gatineau actually is

A Vermont, New York or Michigan job is a day trip from Ottawa or Gatineau, not a relocation. The work is ordinary: service calls, retrofits, commercial maintenance, backflow and gas work.

What changes is everything around the work. A Gatineau crew crossing at Cornwall and an Ottawa crew crossing at Prescott answer the same questions about licences, insurance and tax.

Most contractors start with one US client, usually a property manager or a general contractor already using Canadian trades. That single relationship tests your paperwork before you commit a truck to a weekly crossing.

Treat the US as a second market with its own rules. If you are weighing whether the volume covers the overhead, our guide to markets worth entering sets out how to compare a new territory against your existing service area.

The first decision is not a licence application. It is business structure, because how you register shapes your tax filing, your insurance and your ability to invoice a US entity cleanly.

US licensing: what to ask each state, with Vermont as the example

Start with the state board, not a third-party filing service. Ask three questions. Is a licence required for the scope you will do? Does the state accept Canadian trade credentials? Must a Canadian corporation register as a foreign entity to work there?

New York, Vermont and Michigan each run their own process. Some states require a written exam, a fee, proof of hours and a background check. Others require only business registration plus a locally licensed plumber to pull permits.

Vermont shows what a state-level process looks like. Its plumbing rules are administered by the Department of Public Safety's Division of Fire Safety plumbing licensing office, which licenses qualified plumbers and heating and water treatment specialists, with a Plumbers Examining Board. The legal basis is the Vermont Plumbing Statute, Title 26, Chapter 39, and the division publishes plumbing licence applications for all classes and a list of all licensed plumbers. The rules in force are the Vermont Plumbing Rules, 2025 Edition, with the International Plumbing Code, 2021 Edition, as the adopted code. Anyone applying for a new licence or renewing one after July 1, 2021 must also complete the Vermont Energy Goals education module and send the completion certificate with the application. Parts carried down from Canada have to meet Vermont's lead limits: no solder or flux with more than 0.2 percent lead, and no fixtures whose wetted surfaces contain more than a weighted average of 0.25 percent lead in supplies intended for human consumption, with violations subject to up to $10,000 in penalties. For New York and Michigan, run the same three questions against the state's own licensing pages and, where licensing is delegated, against the city or county building department for the job address.

Your Canadian credentials are the evidence a board asks for. The Red Seal Program is the interprovincial standard. Skilled Trades Ontario regulates the trade in Ontario. The Régie du bâtiment du Québec (RBQ) and Commission de la construction du Québec (CCQ) govern Quebec work.

None of them grants US work rights. Our licensing, mapped layer by layer breakdown shows how provincial and municipal layers stack, and the same logic applies state by state.

Business registration follows a similar pattern. Starting a business - Canada.ca covers the federal registration and compliance steps before you take on any new market.

Structure matters when a US client asks who they are contracting with. Sole proprietorships and partnerships - Canada.ca explains how those forms are treated for tax.

A typical sequence looks like this:

Insurance, workers' compensation and bonding

Your Ontario or Quebec liability policy usually stops at the border. A policy written for Canadian operations may exclude US work outright, or cover it only for short trips.

Request a US endorsement from your broker, or buy a separate US policy. The client will want a certificate naming them as additional insured, and some will ask for a waiver of subrogation.

Workers' compensation is the second gap. WSIB in Ontario and CNESST in Quebec do not automatically extend to work performed in another country. A US workers' compensation policy may be needed for the crew on that job.

Bonding is common on US commercial work. A surety bond guarantees performance, and a Canadian contractor without a US surety relationship will find underwriting slow. Start early.

US general contractors often require limits above what a small Canadian firm carries. Compare the cost of raising limits against the margin on the job, and review insurance types and typical premiums before you quote.

Keep certificates, endorsements and bond letters in one file. Send the client a current certificate before each mobilisation.

Invoicing in USD and getting paid

Quote in USD when the client is American. Pricing in Canadian dollars and converting at payment leaves you carrying the exchange move between quote and deposit.

Open a USD account with a Canadian bank or a cross-border payment provider. It separates US receipts, simplifies reconciliation and cuts conversion fees on every deposit.

Your invoice should state the currency, the payment terms, the exchange rate if you converted, and the tax treatment. US clients often expect net 30, and some hold back a percentage until sign-off.

Decide who carries the exchange risk and put it in writing. Quote in USD and get paid in USD, and that is you.

Late payment is a real risk, because your usual collection routes do not travel well. Ask for a deposit, milestone payments on larger jobs and a clear retainage clause.

Keep every invoice, bank statement and rate note. The Canada Revenue Agency (CRA) expects revenue reported in Canadian dollars, so your conversion records matter at filing time.

Tax: CRA reporting, GST/HST and US withholding

You report worldwide income to the CRA, including US revenue. The question is how it is characterised and whether tax was withheld at source.

GST/HST treatment turns on the place of supply. Services performed on US property for a US client generally fall outside the Canadian GST/HST system, so you may not charge the tax. The rules sit in GST/HST for businesses - Canada.ca.

Do not assume that covers every job. Work on Canadian soil for a US client, or a service consumed in Canada, can still attract the tax.

Charge and collect the GST/HST - Canada.ca explains how rate and place of supply interact by service type and province.

US clients may ask for your GST/HST number to verify you. They can check it through the CRA service described in Confirming a GST/HST account number - Canada.ca.

The US side withholds on its own terms. Payments to a Canadian contractor can attract US withholding tax, and the Canada-US tax treaty may reduce the rate. Get a US tax identification number if the client requires one: a business applies to the IRS for an Employer Identification Number (EIN) on Form SS-4, and an individual without a Social Security number applies for an Individual Taxpayer Identification Number (ITIN) on Form W-7. A US client will usually ask a Canadian business for an IRS Form W-8BEN-E (a sole proprietor uses Form W-8BEN), which is where treaty benefits are claimed. Claim any withheld amount as a foreign tax credit on your Canadian return.

Payroll adds a layer. Hire locally in the US and you may owe US payroll taxes. Send Canadian employees and their T4 slips and source deductions stay Canadian, though US workdays can create filing obligations south of the border.

Tools, parts and the border booth

Tools carried for a US job are temporary exports. Declare them. An itemised list with values and serial numbers prevents a long conversation and proves what came home.

Parts are different. Anything left in the US, or installed and abandoned there, is an export and may attract duty. Keep purchase receipts for anything bought in Canada and used on a US job.

Buying materials in the US is fine. The goods must be declared when you bring them back, and duties or taxes may apply. Parts bought in the US for a US job usually stay there.

A written inventory helps on repeated crossings. Officers see the same truck often, and a consistent paper trail builds a smoother routine.

Check whether your tools contain regulated items. Gas equipment, pressure vessels and refrigerant-handling gear can face extra scrutiny, and CSA Group standards for plumbing and gas equipment are the Canadian reference point.

Crew rotation and travel time

Travel time is the hidden cost. A crew leaving Ottawa or Gatineau for a US site loses hours at the border and on the road, and those hours are rarely billable.

Build travel into the quote. If a job needs two days on site, price three, and consider a hotel night over a same-day return.

Keep the crew small and certified. Everyone crossing should carry identification, proof of trade credentials, and a copy of the licence and insurance certificates for the job.

Rotate people rather than sending the same crew every week. Frequent crossings invite questions about work status, and a documented rotation is easier to explain.

Work status is a separate question from the licence. Whether hands-on work on a US site is permitted for a Canadian crew member is decided by US immigration rules and by the US Customs and Border Protection officer at the port of entry, not by the state board, so confirm it before the first job rather than at the booth. The business visitor (B-1) category is built for meetings, negotiations and similar activity rather than hands-on productive work, so a crew that will install or repair on site needs a clear answer, ideally from an immigration lawyer, on which status covers that work.

Plan the work so one trip covers several tasks. A service call, an inspection and a parts delivery on the same day makes the crossing worthwhile.

Before you scale, pressure-test the numbers. Our guide to expanding a plumbing contractor business covers adding a territory without stretching existing crews, and a plan lenders take seriously is worth having if the US work needs new trucks or a second crew.

Run this before every mobilisation:

Common questions

Do I need a US licence if I only work for one American client?

Usually yes, if the state licenses that scope of work. Some states require a licence for any plumbing performed inside their borders regardless of who the client is. Check the state board before you accept the job.

Can I use my Red Seal to work in the US?

The Red Seal is a Canadian interprovincial standard and grants no US work rights. It supports a state application as proof of training and hours, but each state decides what it accepts.

Do I charge GST/HST to US clients?

Often no, when the service is performed on US property for a US client and the place of supply is outside Canada. Canadian-based work for a US client can still attract the tax, so confirm the treatment job by job.

What happens if a US client withholds tax from my payment?

You may be able to claim a foreign tax credit on your Canadian return, and the Canada-US tax treaty may reduce the withholding rate. Keep the payment records and any US tax forms the client sends.