Understanding How the CRA Treats Different Types of Income and Losses

When Income & Losses Don’t Mix: Understanding CRA Rules

A clear guide from your bookkeeper on why your $90,000 capital loss doesn’t cancel out your $80,000 of business and interest income — and how to avoid a costly reassessment.

Tax rules can feel complicated, especially when you earn income from different sources and experience investment losses in the same year. As a professional bookkeeper, I see this confusion all the time.

A recent example illustrates it perfectly:

A client earned $80,000 in business and interest income in 2025 and also had a $90,000 investment loss.   They assumed the loss would wipe out the income — but that’s not how the CRA works.

Understanding why is the key to filing accurately and planning effectively.

Ordinary Income: What Counts and Why It Matters

Ordinary income includes employment income, business or self‑employment income, interest income, foreign income, pension income, and other taxable amounts. These amounts are fully taxable at your marginal rate, and only expenses directly related to earning them can be deducted.

In our example, the client’s $80,000 of business and interest income falls into this category.

Key rule: Ordinary income cannot be reduced by capital losses.

Capital Losses: A Different Category With Different Rules

Your $90,000 investment loss is a capital loss, and capital losses follow strict CRA rules:

• Capital losses can only offset capital gains

• They cannot reduce business income, employment income, interest income, or pension income

• Even a large loss cannot eliminate ordinary income

So in the example:

• $80,000 ordinary income

• $90,000 capital loss

• Result: the $80,000 remains fully taxable

But the loss isn’t wasted — it becomes a future tax asset:

• Net capital losses carry forward indefinitely

• They can reduce capital gains in any future year and up to 3 previous years

The Common Mistake That Leads to Reassessments

Many taxpayers assume all income and losses get added together. If you file your return as though your $90,000 capital loss cancels out your $80,000 of business and interest income, the CRA will likely reassess.

A reassessment can mean:

• Additional tax owing

• Interest charges

• Stress and delays

Proper classification prevents these surprises.

Why the CRA Separates Income Types

Each income type is governed by its own section of the Income Tax Act. These distinctions exist to ensure:

• Accurate reporting

• Fair taxation

• Consistent treatment across taxpayers

• Clear planning for future years

Understanding these categories helps you make informed decisions throughout the year.

How Your Bookkeeper Protects You

My role is to ensure everything is recorded and categorized correctly so you’re never caught off guard at tax time. That includes:

• Tracking income by type

• Recording losses properly

• Monitoring carry‑forward amounts

• Identifying issues before they become problems

• Helping you understand how each decision affects future returns

Good bookkeeping isn’t just compliance — it’s clarity, confidence, and long‑term planning.