Line 10400 Tax Return Canada 2026

Ever wonder where all those odd bits of employment income go on your tax return? You know — the cash tips your employer never tracked, that research grant from grad school, or income from your gig working remotely for a US company? They're not on your T4, but they're definitely taxable. Welcome to line 10400: the catch-all category for "other employment income" that the CRA absolutely expects you to report, even if there's no slip to remind you.

What Exactly Goes on Line 10400?

Think of line 10400 as the miscellaneous drawer of employment income reporting — it's where all the non-traditional employment earnings land. Unlike line 10100 which captures your regular salary and wages shown in box 14 of your T4, line 10400 is for income that either comes from different sources or gets reported differently.

Foreign Employment Income: The US W-2 Situation

Working for an American employer while living in Canada? This gets a bit tricky. Your US W-2 shows income after certain deductions like 401(k) contributions, Medicare, and FICA taxes. But here's the catch: Canada wants your GROSS income before those deductions. You'll need to add back your 401(k), 403(b), 457 plan contributions, plus Medicare and FICA amounts to get your true foreign employment income for line 10400.

Convert everything to Canadian dollars using the Bank of Canada exchange rate from the day you received the income (or an appropriate average rate if paid throughout the year). Don't subtract the US taxes withheld — instead, claim those as a foreign tax credit on line 40500 when you calculate your federal and provincial taxes. Understanding your tax residency status is crucial when reporting foreign income properly.

Research Grants: Reporting Net Income

Got a research grant? You're only taxed on the portion you actually kept after legitimate research expenses. The CRA lets you deduct allowable research costs directly from the grant amount, and you report only the net amount on line 10400. Allowable expenses include equipment, materials, travel for research purposes, and conference fees. What doesn't qualify? Personal living expenses, even if you temporarily lived elsewhere while doing the research.

Important: Your research expenses cannot exceed the grant amount. If your grant was $10,000 and you spent $12,000, you can only deduct $10,000, bringing your line 10400 income to zero. Keep detailed receipts and attach a list of your research expenses to your paper return.

What Line 10400 Income Doesn't Qualify For

Here's where line 10400 differs from line 10100 in ways that actually matter to your wallet. Income reported on line 10400 doesn't qualify for enhanced CPP benefits because CPP contributions weren't deducted at source. It's also not eligible for EI benefits for the same reason — no EI premiums means no EI coverage.

Additionally, line 10400 amounts don't count toward your RRSP contribution room. Only "earned income" on which pensionable earnings were calculated generates RRSP room. However, you CAN claim the Canada Employment Amount (line 31260) if you have any employment income on either line 10100 OR line 10400.

How Line 10400 Affects Your Taxes

All income reported on line 10400 is fully taxable at your marginal tax rate. Unlike some types of income that get preferential treatment (like capital gains or eligible dividends), line 10400 amounts are treated as ordinary income. They flow into your total income calculation, affect your net income, and ultimately determine your tax bracket.

After you file, your Notice of Assessment will show how the CRA processed your line 10400 income. If you reported foreign employment income and claimed foreign tax credits, double-check that both were applied correctly.