When most business owners buy a steel building, they think of it as one line item: a capital asset. What they often don’t think about is which tax class that asset falls into – and that oversight can mean leaving thousands of dollars on the table every year.
In Canada, the Canada Revenue Agency (CRA) doesn’t let you deduct the full cost of a building in the year you build it. Instead, you depreciate it over time using the Capital Cost Allowance (CCA) system. The rate at which you can deduct that cost depends entirely on which CCA class your building is assigned to. For pre-engineered steel buildings, the difference between getting the classification right and defaulting to the wrong one can add up to a significant gap in your annual deductions – especially in the early years of ownership.
Here’s what you need to know.
What Is Capital Cost Allowance?
CCA is Canada’s version of depreciation for tax purposes. When you purchase or construct a capital asset – a building, a piece of equipment, a vehicle – you generally can’t deduct the full cost in year one. Instead, the CRA assigns that asset to a class, and each class has a prescribed annual deduction rate applied on a declining balance basis.
The higher the rate, the faster you recover your costs through deductions, and the sooner that tax relief improves your cash flow.
The Three Classes That Matter for Steel Buildings
Class 1 – 4% Declining Balance
Class 1 is the default class for most permanent buildings in Canada. If your accountant classifies your steel building here without asking questions, you’ll deduct 4% of the undepreciated capital cost (UCC) each year.
On a $600,000 building, that’s a $24,000 deduction in year one. Useful – but it’s the slowest write-off available.
Most brick, concrete, and conventionally framed commercial buildings end up here. The problem is that many pre-engineered steel buildings end up here too, simply because that’s where the accountant defaults.
Class 6 – 10% Declining Balance
This is where it gets interesting for steel building owners.
Class 6 applies to buildings constructed of frame, log, stucco on frame, galvanized iron, or corrugated metal – provided they meet certain conditions (including that they don’t have a permanent foundation in some interpretations, though this varies). Pre-engineered steel and metal buildings frequently meet this definition, particularly when they are clad in corrugated or ribbed steel panels.
At 10%, you’re deducting more than twice as fast as Class 1. On that same $600,000 building, your first-year deduction jumps to $60,000. Over five years, the cumulative difference between Class 1 and Class 6 treatment is substantial.
Class 8 – 20% Declining Balance
Class 8 catches miscellaneous tangible capital property not otherwise classified – including certain structures, outdoor signs, machinery, and equipment. While the building itself typically won’t land in Class 8, specific components might: certain freestanding canopies, portable or relocatable structures, and equipment installed within the building could qualify for this faster 20% rate.
It’s worth having your accountant look at a steel building project as a bundle of assets, not a single line item, because some elements may be separable and classifiable at a higher rate.
Why the Classification Matters: A Simple Example
Let’s put some numbers to it. Assume a pre-engineered steel warehouse with a total capital cost of $500,000.
Class 1 (4%) | Class 6 (10%) | |
|---|---|---|
Year 1 deduction | $20,000 | $50,000 |
Year 2 deduction | $19,200 | $45,000 |
Year 3 deduction | $18,432 | $40,500 |
Year 4 deduction | $17,695 | $36,450 |
Year 5 deduction | $16,987 | $32,805 |
5-year total | $92,314 | $204,755 |
If your marginal corporate tax rate is 27%, that’s a difference of roughly $30,000 in actual tax savings in the first five years alone – just from the classification decision. The money isn’t lost under Class 1, but you get it back much more slowly.
What Actually Determines the Class?
The CRA looks at several factors when determining which class a building falls into:
Construction materials. This is the primary test for Class 6. Pre-engineered steel buildings clad in ribbed or corrugated steel panels are strong candidates. The key is the exterior cladding and structural composition, not simply the fact that steel is involved.
Whether the structure is permanent. The foundation type and intended permanence of the structure can affect classification. Some interpretations have placed relocatable or skid-mounted steel structures differently than those on concrete perimeter foundations.
What’s part of the building vs. separate assets. The CRA’s “integral part of a building” test determines whether something like a mezzanine, a spray booth, or specialized mechanical system is part of the building (and inherits its class) or a separate asset with its own classification.
Date of acquisition. CCA rules have changed over time. Buildings acquired before 1988 follow different rules entirely. The rules that apply are those in effect at the time of acquisition.
The Immediate Expensing Rules (Don’t Overlook This)
In recent years, the federal government introduced temporary immediate expensing for eligible depreciable property, allowing Canadian-Controlled Private Corporations (CCPCs) to deduct up to $1.5 million in eligible property costs in the year of acquisition rather than writing them off gradually.
Buildings are generally excluded from immediate expensing – they fall under Class 1, 6, or similar, which are not eligible property classes. However, equipment and other assets installed within or alongside the building may qualify. This is another reason to have your accountant separate the project into its component assets before filing.
The rules around immediate expensing have evolved, and the limits have changed from year to year, so get current advice from your CPA for the tax year in which your project is completed.
What to Do Before You Build (or File)
- Raise this with your accountant early. Ideally before you finalize design and contracts. Some decisions made at the design phase – foundation type, cladding material, whether certain structures are separate – can affect how the CRA views the asset.
- Keep detailed records. Have your contractor provide an itemized breakdown of costs: the building shell, the foundation, the mechanical systems, the interior improvements. This makes it much easier to argue for appropriate classification of individual components.
- Don’t assume the default. Class 1 is the path of least resistance for an accountant who doesn’t specialize in construction. If your building is pre-engineered steel with corrugated or ribbed metal cladding, it’s worth asking the specific question: does this qualify for Class 6?
- Consider a cost segregation review. For larger projects, a cost segregation analysis – performed by a specialist – identifies and reclassifies components to their highest allowable CCA class. The upfront cost of the analysis is often dwarfed by the additional deductions it unlocks.
The Bottom Line
Your steel building is a significant capital investment. How it’s classified for CCA purposes will affect your cash flow for years. Pre-engineered steel buildings often qualify for Class 6 treatment at 10%, versus the default Class 1 rate of 4% – but this doesn’t happen automatically. It requires asking the right questions before you file, and ideally before you break ground.
If you’re planning a new steel building project in BC and want to understand how to structure the project from the ground up, we’re happy to walk you through the construction side of the equation. The tax piece is your accountant’s job – but making sure the building is designed and documented in a way that supports the right classification? That’s where we can help.
