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Many Canadian businesses find the opportunities to cross into and profit from the US market enticing. Before doing so, there are several things to consider such as whether to establish a branch office or US corporation, which US taxes will apply, and how products will be shipped. Often overlooked is the consideration of which state and local taxes (“SALT”) will apply.
Where an entity is doing business in more than one country, tax treaties between the countries dictate which country is authorized to tax the income. These treaties are in place to reduce the potential for taxation of the same income in multiple countries. Generally these treaties only apply at the federal level and often do not apply at the US state level. The degree of aggressiveness to attribute income to their respective state varies by individual state and each one must be considered separately in order to determine the appropriate taxation. Even more disconcerting is the fact that some US cities also have their own taxation requirements.
The minimum connection allowing a state to impose its tax is known as “nexus” and is determined using several thresholds. The thresholds are discussed below and vary from state to state as well as by type of tax including income tax, franchise tax, and sales tax.
State income tax
If a company has nexus with a state, it will be responsible for filing a state income tax return and paying state income taxes for that state. If several states are involved, the US-sourced income will be allocated amongst the states based on sales, property and payroll in each state.
Physical presence qualifies for nexus in most states. Factors that create physical presence include:
- Maintaining inventory in a warehouse, or consigning to a customer;
- Employees soliciting sales or performing other functions;
- In-state contractors providing repairs, training, or services;
- Customers downloading software to their systems; and
- In-state providers directing web traffic to a business’ website.
Many states have ignored physical presence by adopting an ‘economic nexus’ or ‘factor presence’ standard whereby a taxpayer establishes nexus with a state by exceeding one of the following thresholds:
- $50,000 of property;
- $50,000 of payroll;
- $50,000 sales; or
- 25% of total property, total payroll, or total sales.
A US federal law prohibits a state from imposing a net income tax if an entity’s activities are limited to solicitation of sales of tangible personal property when the orders are approved and filled from outside the state. This law reduces the exposure to state income tax in the case of travelling salespeople as they may not create tax nexus even though they are soliciting orders in a given state. This law is limited in that it only applies to sale of goods not services, does not apply to non-US resident corporations, and only applies to state income taxes not sales or franchise taxes.
State franchise tax
Franchise taxes are based on the privilege of doing business in a particular state. The nexus-creating activities for franchise tax are similar to those for income tax; the main difference being that franchise tax does not necessarily respect the provisions of the US federal law mentioned above.
State sales tax
State sales taxes are similar to Canada’s GST, PST, and HST which vary among provinces. Typically, there are minimum thresholds to overcome for isolated or casual sales. The ability to apply state sales taxes has historically followed the state’s application of nexus for income taxes; however some states have strayed from nexus and require sales tax collection from remote sellers who have no physical presence in their state.
Identifying activity within a state
There are several ways a state can identify entities that are conducting business within their borders. State auditors research business connections by:
- Reviewing import logs from US customs to determine who is shipping items into the state;
- Auditing in-state companies and identifying out-of-state invoices/vendors;
- Roaming trade shows and conferences to identify attendees; and
- Performing interdepartmental inquiries to identify other state licensing or registrations.
Some states require in-state customers to withhold tax from payments made to out-of-state residents for the portion of services actually performed within the state. The vendors are identified for future follow-up once the withheld taxes are remitted to the state’s taxation authority.
Many states are also sharing information with one another which has led to successive audits of non-US resident companies.
If an entity has been doing business in any number of states in which it is not registered for tax purposes, it should consider voluntarily disclosing its operations to the states in question. Some states allow the taxpayer to anonymously present their particular facts and enter into an agreement with the state which limits the period open to taxation (often to three or four years) and eliminates all penalties. Registering with a state prior to filing for a voluntary disclosure eliminates an entity’s eligibility for the program, so the order that corrective action is taken is important.
If you are considering expanding business operations into the US or have already done so, please contact Brent Hoshizaki of Manning Elliott’s US Tax Team for more information on the implications of SALT to your bottom line.
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 Multistate Tax Commission 2002 proposal
 Public Law 86-272
 Similar to the Canadian T4A-NR withholding tax requirement for payments to non-Canadian residents