Understanding How the CRA Treats Different Types of Income and Losses

A clear guide from your bookkeeper on why your $90,000 capital loss doesn’t cancel out your $80,000 of business 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:

In 2025, a client earned $80,000 in business income but also incurred a $90,000 investment loss. They believed the loss would offset the income entirely, leaving no tax payable — however, the CRA doesn’t treat investment losses that way.

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

Ordinary Income: What It Includes and Why It Matters   Ordinary income covers the money you earn from employment, business or self‑employment, interest, foreign income, pensions, and other taxable sources. These amounts are fully taxed at your marginal rate, and you can only deduct expenses that directly relate to earning them.

In this scenario, the client’s $80,000 of business and interest income is treated as ordinary income.

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

Capital Losses: A Separate Category With Their Own Rules  

A $90,000 investment loss is considered a capital loss, and capital losses come with very specific CRA rules:

• Capital losses can only be used to offset capital gains   • They cannot reduce ordinary income such as business, employment, interest, or pension income • Even a large capital loss can’t wipe out ordinary income

In this case:

• $80,000 in ordinary income

• $90,000 capital loss

• Result: the $80,000 remains fully taxable

The silver lining is that the loss still has value — it becomes a future tax asset:

• Net capital losses can be carried forward indefinitely  

• They can also be applied against capital gains in any future year, or carried back up to three previous years

The Common Mistake That Leads to Re-assessments

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 re-assessment 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

The Bookkeeper's 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.