How to Convert Foreign Currency Business Expenses for Canadian Taxes

If you pay for business expenses in US dollars or another foreign currency, you cannot simply report the foreign amount on your Canadian tax return. The CRA requires that all income and expenses be reported in Canadian dollars. The question is: which exchange rate do you use, and how do you document it?

This guide covers the CRA's rules for currency conversion, when you can use a daily rate versus an annual average, and how to keep clean records so you are never caught off guard during a review.

The CRA Rule: Everything in Canadian Dollars

The Income Tax Act requires that all amounts on your tax return be expressed in Canadian dollars. This applies to both income you receive in foreign currency and expenses you pay in foreign currency.

There is no exemption for small amounts. Whether it is a $9.99 USD software subscription or a $5,000 USD conference fee, you must convert the amount to CAD before claiming it.

Which Exchange Rate to Use

Bank of Canada Daily Rate

The default and most commonly accepted method is to use the Bank of Canada daily exchange rate on the date of the transaction. This is the rate the CRA considers the most accurate reflection of the value at the time the expense was incurred.

For example, if you paid $99.00 USD for a SaaS subscription on March 15, 2025, you would look up the Bank of Canada USD/CAD rate for March 15, 2025, and multiply:

Item	Value
Expense amount	$99.00 USD
Bank of Canada rate (Mar 15, 2025)	1.3625
CAD equivalent	$134.89 CAD

You can find daily exchange rates on the Bank of Canada website at bankofcanada.ca/rates/exchange/daily-exchange-rates/. The Bank of Canada also provides a Valet API for programmatic lookups if you want to automate the process.

Annual Average Rate

For self-employed individuals, the CRA also accepts the Bank of Canada annual average exchange rate as a reasonable alternative. This simplifies bookkeeping significantly because you apply a single rate to all transactions in a given currency for the entire year.

The CRA states in Guide T4002 that you may use the average annual rate published by the Bank of Canada to convert foreign income and expenses, as long as you apply the method consistently.

When the annual average makes sense:

• You have many small recurring expenses in a single foreign currency (monthly SaaS tools, ongoing US subscriptions)
• The exchange rate was relatively stable throughout the year
• You want to reduce bookkeeping overhead

When you should use the daily rate instead:

• You have a small number of large foreign expenses
• The exchange rate was volatile during the year
• You want the most precise deduction possible (the daily rate may yield a larger CAD amount on days the dollar was weak)

Credit Card and Bank Rates

A common question: can you just use the rate your credit card or bank charged you? The CRA does not explicitly endorse using your credit card company's exchange rate, because these rates include markup. The Bank of Canada rate is the accepted standard.

That said, if your credit card statement shows the CAD amount charged, some tax professionals consider that the actual cost you incurred and therefore a reasonable amount to claim. The safest approach is still the Bank of Canada rate, especially if you are ever reviewed.

Common Scenarios

US SaaS Subscriptions

Most Canadian freelancers pay for at least a few tools in USD: project management software, design tools, cloud hosting, email marketing platforms. These are typically monthly charges of $10 to $200 USD.

Best approach: Use the annual average rate. With 12 small transactions per tool, looking up daily rates for each one is tedious and the difference is negligible.

Example: You paid $49.00 USD per month for a project management tool throughout 2025. The Bank of Canada annual average rate for 2025 was 1.3592.

• Total USD spent: $49.00 x 12 = $588.00 USD
• CAD equivalent: $588.00 x 1.3592 = $799.21 CAD

PayPal USD Payments

If you receive USD payments from clients through PayPal and PayPal holds the funds in USD before converting, you have two conversion events: the income (when earned) and the conversion to CAD (when transferred). The income is converted at the Bank of Canada rate on the date you earned it (typically the invoice date or payment receipt date). Any gain or loss from holding USD before converting it is a separate foreign exchange gain or loss.

For expenses paid via PayPal in USD, the same rules apply: use the Bank of Canada rate on the transaction date, not PayPal's conversion rate.

US Client Travel

If you travel to the US for business (client meetings, conferences, trade shows), you likely incur hotel, meal, airfare, and transportation expenses in USD. Each expense should be converted individually using the daily rate for the date it was incurred, or you can apply the annual average rate.

Keep all receipts in their original currency. Record both the USD amount and the CAD equivalent in your bookkeeping.

How to Document Currency Conversions

The CRA expects you to be able to support your claimed amounts. For foreign currency expenses, good documentation means:

1. Keep the original receipt showing the amount in the foreign currency
2. Record the exchange rate used and the source (Bank of Canada daily rate or annual average)
3. Note the CAD equivalent beside each entry in your books
4. Be consistent with your chosen method within each tax year

If you use the annual average method, note the rate and source once for the year. If you use daily rates, record the rate for each transaction.

What the CRA Wants to See in a Review

If the CRA reviews your return and questions foreign currency expenses, they will want:

• Proof you incurred the expense (receipt or invoice)
• The foreign currency amount
• The exchange rate you used and how you determined it
• The calculated CAD amount

Having a clean spreadsheet or accounting record that shows all four data points for each transaction makes a review straightforward.

Foreign Exchange Gains and Losses

If you hold foreign currency in a business bank account and the exchange rate changes between when you receive the funds and when you convert them, the difference is a foreign exchange gain or loss. Gains are taxable income, and losses are deductible.

For most freelancers who convert USD payments promptly, these amounts are small. But if you maintain a USD account with a significant balance, track the rate when funds come in and when they go out.

Annual Average Rates: Where to Find Them

The Bank of Canada publishes annual average exchange rates at bankofcanada.ca/rates/exchange/annual-average-exchange-rates/. These are typically available in January for the prior year.

For daily rates, use the daily exchange rate lookup or the Valet API at bankofcanada.ca/valet/.

Key Takeaways

• All foreign currency amounts must be converted to CAD before reporting on your tax return
• Use the Bank of Canada daily rate on the transaction date for the most accurate conversion
• The annual average rate is an accepted alternative for simplicity, especially with many small recurring expenses
• Do not use your credit card or PayPal rate as your primary conversion method
• Document everything: original amount, rate used, source, and CAD equivalent
• Be consistent with your chosen method throughout the tax year

Sources

1. CRA Guide T4002 — Self-employed Business, Professional, Commission, Farming, and Fishing Income
2. CRA — Foreign income and tax
3. Bank of Canada — Daily Exchange Rates
4. Bank of Canada — Annual Average Exchange Rates
5. Bank of Canada — Valet API Documentation