Cross Border Tax Accountant: When a Canadian Only CPA Isn’t Enough

Do You Need a Cross Border Tax Accountant? A Quick Checklist

Most Canadian accountants are excellent at Canadian tax. The trouble starts when your situation touches the United States, because the two systems do not talk to each other and the penalties for missing a form are far larger than the tax itself. The pattern to notice is that almost none of the triggers below are about how much tax you owe. They are about filing obligations that exist even when the tax bill is zero, and that is exactly where people get hurt: a missed FBAR or Form 3520 can cost five figures on a year where nothing was payable in either country. If any of these apply to you, a Canadian only CPA is probably not enough:

• You are a U.S. citizen or green card holder living in Canada, whatever your income
• You moved to Canada and still hold U.S. bank, brokerage or retirement accounts
• You own a U.S. LLC, corporation, rental property or vacation home
• You live in Canada and work remotely for a U.S. employer
• You are selling Canadian real estate as a non resident, or you are leaving Canada
• You hold more than $100,000 CAD of foreign property at any point in the year
• You have a U.S. spouse, or U.S. beneficiaries in your will

U.S. Citizens and Green Card Holders Living in Canada

The United States taxes on citizenship, not residence. If you hold a U.S. passport or a green card, you file a U.S. return every year for the rest of your life, no matter how long you have lived in Vancouver. You almost never owe U.S. tax, because Canadian combined rates are higher and the foreign tax credit soaks up the difference. What you do owe is paperwork:

Three practical warnings. First, your RRSP is protected by the treaty and grows tax deferred for U.S. purposes. Your TFSA is not, so its income is taxable in the U.S. and it can drag you into trust reporting, which is why many U.S. citizens in Canada rethink the usual advice on which registered account to fill first. Second, Canadian mutual funds and ETFs are usually PFICs, which is one of the ugliest corners of the U.S. code, and failing to report one can leave your U.S. return open to audit indefinitely. Third, if you have never filed, the IRS Streamlined procedures exist for exactly that situation and are far cheaper than being found.  

New Canadian Residents Who Still Hold U.S. Accounts or Property

When you become a Canadian tax resident, you are deemed to have acquired most of your property at fair market value on that date. That deemed cost matters enormously later, and almost nobody documents it at the time.

Whether and when you became a resident at all is decided by the Canadian tax residency rules, not by your immigration status. You also start reporting worldwide income to CRA, and if your foreign property costs more than $100,000 CAD in total you file Form T1135. That threshold uses cost, not market value, and it catches far more people than they expect, as our guide to reporting foreign property after you move to Canada sets out. If this is your first Canadian filing season, start with filing your first tax return as a newcomer to Canada.

Canadians Who Own a U.S. LLC, Corporation or Rental Property

The U.S. LLC is the single most common cross border mistake made by Canadians. The U.S. treats it as flow through. Canada generally treats it as a corporation. The result is a mismatch where you can pay U.S. tax personally and Canadian tax again on the distribution, with no clean credit for the U.S. tax. If someone set up an LLC for your U.S. rental without asking a Canadian advisor, get it reviewed, and read our note on tax planning strategies for an LLC before you add anything else to it.

Rental income from U.S. property also comes with a choice. By default the U.S. withholds 30% of gross rent. Making a net election lets you file a U.S. return and pay tax on actual profit after expenses and depreciation, which is almost always better. The Canadian side of the same property follows the ordinary rules on taxing rental income in Canada, with a foreign tax credit for what the U.S. took. And when you sell, FIRPTA withholding applies on the gross sale price unless you obtain a withholding certificate.  

Remote Workers Employed by a U.S. Company From Canada

If you live in Canada and work for a U.S. employer, you are a Canadian tax resident taxed on that income in Canada. The friction is on the employer side: a U.S. company with an employee sitting in Canada may create Canadian payroll obligations, and in some cases a permanent establishment.

The treaty’s employment income rules can exempt short assignments in the other country where the pay is small or the stay is brief and the cost is not borne by an employer or permanent establishment there. Those tests are narrow. Anything that looks like a permanent arrangement needs proper structuring, whether through a Canadian payroll registration, an employer of record, or converting to a contractor relationship with the right documentation, and the line between those two is drawn by the employee versus contractor rules CRA applies.  

Non Residents Selling Canadian Property, and People Leaving Canada

Selling as a non resident. The buyer is required to withhold 25% of the gross sale price, 50% for depreciable property such as a rental building, unless you obtain a section 116 clearance certificate from CRA. That withholding is on the whole price, not your gain, so on a $900,000 sale the amount held back is $225,000. Apply for the certificate before or immediately after closing, not months later, and see how section 116 clearance certificates work for the timing.

Leaving Canada. Emigration triggers a deemed disposition of most property at fair value, which people call departure tax. Some assets are excluded, such as Canadian real property and registered plans, and you can post security instead of paying immediately. Getting the departure date and the valuation right is the whole game, and our guide to what happens to your taxes when you leave Canada walks through both.  

How the Canada U.S. Tax Treaty Prevents Double Taxation

Four parts of the treaty do most of the work:

• Article IV breaks residency ties when both countries claim you, using a sequence of tests: permanent home, centre of vital interests, habitual abode, then citizenship.
• Article XV covers employment income and can exempt short, low value assignments in the other country.
• Article XVIII covers pensions and gives the RRSP its tax deferred treatment for U.S. purposes.
• Article XXIV is the foreign tax credit mechanism that stops the same income being taxed twice.

The treaty reduces double tax. It does not remove the obligation to file in both countries, and taking a treaty position on a U.S. return usually needs to be disclosed on Form 8833.  

Which Forms Get Filed on Each Side, and the Penalties

This is the part worth reading twice, because the penalties are not proportionate to the tax.

None of these are tax. They are information returns, and people routinely owe nothing while facing five figure exposure.  

What a Cross Border Engagement Costs and What’s Included

Expect a cross border personal engagement to cost several times a standard Canadian T1, because you are getting two returns plus information forms plus the coordination between them. A typical scope includes the Canadian T1 with T1135 where needed, the U.S. 1040 with FBAR and any applicable FATCA and PFIC forms, foreign tax credit optimisation across both, and a review of your account and entity structure.

For context on the Canadian half of that fee, see what accounting services cost in Canada. Ask specifically whether the firm prepares both returns in house. Splitting the work between a Canadian accountant and a U.S. preparer who never speak is how foreign tax credits get missed on both sides.  

FAQ: Cross Border Tax for Canadians and Americans

I am a U.S. citizen who has never filed while living in Canada. What now?

The IRS Streamlined Foreign Offshore procedures let you catch up on three years of returns and six years of FBARs, usually without penalties, if the failure was not willful. Do this before the IRS contacts you.  

Does having a TFSA really cause U.S. problems?

It can. The income is taxable in the U.S., and depending on how the account is structured it may bring trust reporting with it. Many U.S. citizens in Canada prioritise RRSP room instead.  

Will the treaty stop me being taxed twice?

On most income, yes, through foreign tax credits. It does not stop you filing in both countries, and it does not fix mismatches like the LLC problem.  

Do I have to report my Canadian home on my U.S. return?

Not while you own it. When you sell, the U.S. taxes the gain with a limited exclusion, even though Canada may exempt it entirely as a principal residence. That gap surprises people.  

What is the T1135 threshold based on?

Total cost of specified foreign property exceeding $100,000 CAD at any time in the year. Cost, not market value, and it includes foreign brokerage holdings.

I have a U.S. LLC. Should I get rid of it?

Often yes, but unwinding it can itself be a taxable event. Get it modelled before you act.  

How long does a section 116 clearance certificate take?

Plan for several months. Your lawyer will usually hold the withheld funds in trust until CRA issues it.  

Are U.S. Social Security and CPP taxed in both countries?

The treaty generally assigns taxation to the country of residence, with a portion of cross border benefits included. The mechanics differ by benefit, so confirm your specific situation.  

Can my Canadian accountant just file the U.S. forms?

Only if they are qualified and licensed to do so. Preparing a 1040 with PFIC and trust reporting is a specialty, not an add on.  

Talk to a Cross Border Tax Accountant in Metro Vancouver