Canadian Business Expanding into the US: Your Tax and Accounting Checklist

The US Market Is a Major Opportunity. The Compliance Requirements Are Real.

For Canadian businesses, the United States represents the largest and most accessible export market in the world. But expanding across the border also means entering one of the most complex tax environments in the world. Getting your US tax and accounting setup right from the beginning is far less expensive than fixing it later.

Here is what Canadian businesses need to address when expanding into the US.

Step 1: Choose the Right US Entity Structure

The first decision is what type of US entity to set up. The most common options are a C-Corporation, a Limited Liability Company, or a branch of your Canadian corporation. Each has different tax implications in both countries, different filing requirements, and different effects on how profits are repatriated back to Canada.

For example, a US C-Corporation pays US corporate tax on its profits, and dividends paid back to the Canadian parent are subject to withholding tax under the treaty. An LLC treated as a disregarded entity may create different cross-border tax outcomes depending on whether the Canadian parent elects to treat it as a corporation or a flow-through for Canadian tax purposes. Choosing the wrong structure at the start can be costly to unwind.

Step 2: Understand Your Permanent Establishment Exposure

Even without setting up a formal US entity, your Canadian business may create a US permanent establishment simply by having employees or contractors working in the United States, or by providing services there for extended periods. A permanent establishment means the US has the right to tax the profits attributable to that presence. Understanding whether and when you cross that threshold is critical.

Step 3: Register for US Federal and State Tax Obligations

Once you have a US entity or a taxable US presence, you need to register with the IRS for an Employer Identification Number, register for any applicable state taxes, and understand your sales tax nexus obligations across the states where you operate or sell. US sales tax is administered at the state level, and the rules vary significantly from state to state.

Step 4: Set Up Your Cross-Border Accounting Infrastructure

Your US and Canadian entities will have transactions between them, including intercompany charges for services, royalties, management fees, and loans. These transactions need to be documented, priced at arm's length, and recorded correctly in both sets of books. Multi-currency accounting, intercompany reconciliations, and consolidated financial reporting all need to be built into your accounting infrastructure from day one.

Step 5: Understand Your US Tax Filing Obligations

A US corporation files Form 1120 with the IRS annually. A foreign corporation with a US permanent establishment files Form 1120-F. If there are transactions between your US entity and its Canadian parent, Form 5472 must also be filed. Payroll obligations, including W-2 and 1099 reporting, apply from the moment you have US-based employees or contractors.

Step 6: Plan for Cross-Border Payroll

If you are sending Canadian employees to work in the US, or hiring US-based employees, you need to understand the payroll withholding obligations in both countries, the impact of the Canada-US Totalization Agreement on social security contributions, and how employment income is taxed under the treaty.

How FMC Agency Can Help

We work with Canadian businesses at every stage of US expansion, from entity selection and accounting setup to ongoing cross-border tax compliance and financial reporting. We help you get the structure right at the start, so the compliance is manageable and the tax outcomes are as efficient as possible.