The Income Tax Act now runs to over 1,400 pages, up from roughly 80 when it was last fundamentally rebuilt in 1971. That expansion didn't happen because the economy became more complex. It happened because successive governments used the tax code as a blunt instrument for social policy, layering credits and exemptions onto a structure never designed to carry them.
The result is a system where compliance costs hit small businesses disproportionately hard. According to the Canadian Federation of Independent Business, the smallest Canadian businesses pay over five times more per employee on regulatory compliance than larger firms. The scale advantage isn't just operational. Larger firms can afford the planning required to navigate hundreds of targeted credits that smaller operators either miss or can't claim because the administrative burden exceeds the benefit.
Why the patches stuck around
Tax expenditures, the credits, deductions, and exemptions that reduce what would otherwise be owed, now number in the hundreds. Many serve overlapping goals. The political logic is straightforward: announcing a new credit for electric vehicle buyers or home renovation projects polls well. Eliminating that credit later, even when usage is low or the policy goal has shifted, becomes a headline risk. The result is accretion. Each budget adds. Almost none subtract.
The last comprehensive review of Canada's tax system was the Carter Commission in 1966, which argued that "a buck is a buck", all income should face the same treatment. The principle didn't survive contact with implementation. The political cost of removing preferential treatment for capital gains or certain deductions was too high. What emerged instead was a tax code that treats income streams differently, complicates compliance, and creates arbitrage opportunities for those sophisticated enough to exploit them.
The revenue-neutral path
CPA Canada and several policy institutes have called for a Royal Commission-style review, one that would strip out niche credits in exchange for lower marginal rates across the board. Revenue-neutral reform means the government collects the same total, but taxpayers face simpler filings and clearer incentives. The appeal is efficiency. The obstacle is politics. Removing even a minor credit, say, the deduction for tradespeople's tools, generates organized opposition. Broad rate cuts generate diffuse support. The former is louder.
Inter-provincial coordination adds friction. Most provinces rely on the federal government to collect their income tax, meaning changes to the federal base ripple through provincial budgets. Quebec administers its own system, but the other provinces would need to align on any major structural shift. That requires negotiation across governments with different fiscal priorities and election cycles.
What the complexity actually does
The "complexity tax" is uneven. High-net-worth taxpayers hire accountants who identify planning opportunities embedded in the 1,400-page structure. Middle-income filers miss credits they qualify for because they don't know the credits exist or can't parse the eligibility rules. The CRA itself struggles. Modernizing IT systems and enforcement has absorbed billions in recent federal budgets, much of it spent making a convoluted system marginally more administrable rather than addressing the underlying sprawl.
Productivity suffers. Canada's treatment of capital investment and intellectual property lags competitor jurisdictions in ways that matter for long-term growth. The OECD has flagged this repeatedly. The tax gap, the difference between what's owed and what's collected, remains a focus, but closing it through enforcement is harder when the rules themselves create genuine confusion about what compliance looks like.
Reform would take years to draft and implement, likely spanning multiple governments. The risk of a half-finished overhaul, abandoned mid-cycle when priorities shift, is real. But the alternative is a tax code that continues to thicken, where each new patch makes the next reform harder and the distance from first principles grows.
The Income Tax Act now runs to over 1,400 pages, up from roughly 80 when it was last fundamentally rebuilt in 1971. That expansion didn't happen because the economy became more complex. It happened because successive governments used the tax code as a blunt instrument for social policy, layering credits and exemptions onto a structure never designed to carry them.
The result is a system where compliance costs hit small businesses disproportionately hard. According to the Canadian Federation of Independent Business, the smallest Canadian businesses pay over five times more per employee on regulatory compliance than larger firms. The scale advantage isn't just operational. Larger firms can afford the planning required to navigate hundreds of targeted credits that smaller operators either miss or can't claim because the administrative burden exceeds the benefit.
Why the patches stuck around
Tax expenditures, the credits, deductions, and exemptions that reduce what would otherwise be owed, now number in the hundreds. Many serve overlapping goals. The political logic is straightforward: announcing a new credit for electric vehicle buyers or home renovation projects polls well. Eliminating that credit later, even when usage is low or the policy goal has shifted, becomes a headline risk. The result is accretion. Each budget adds. Almost none subtract.
The last comprehensive review of Canada's tax system was the Carter Commission in 1966, which argued that "a buck is a buck", all income should face the same treatment. The principle didn't survive contact with implementation. The political cost of removing preferential treatment for capital gains or certain deductions was too high. What emerged instead was a tax code that treats income streams differently, complicates compliance, and creates arbitrage opportunities for those sophisticated enough to exploit them.
The revenue-neutral path
CPA Canada and several policy institutes have called for a Royal Commission-style review, one that would strip out niche credits in exchange for lower marginal rates across the board. Revenue-neutral reform means the government collects the same total, but taxpayers face simpler filings and clearer incentives. The appeal is efficiency. The obstacle is politics. Removing even a minor credit, say, the deduction for tradespeople's tools, generates organized opposition. Broad rate cuts generate diffuse support. The former is louder.
Inter-provincial coordination adds friction. Most provinces rely on the federal government to collect their income tax, meaning changes to the federal base ripple through provincial budgets. Quebec administers its own system, but the other provinces would need to align on any major structural shift. That requires negotiation across governments with different fiscal priorities and election cycles.
What the complexity actually does
The "complexity tax" is uneven. High-net-worth taxpayers hire accountants who identify planning opportunities embedded in the 1,400-page structure. Middle-income filers miss credits they qualify for because they don't know the credits exist or can't parse the eligibility rules. The CRA itself struggles. Modernizing IT systems and enforcement has absorbed billions in recent federal budgets, much of it spent making a convoluted system marginally more administrable rather than addressing the underlying sprawl.
Productivity suffers. Canada's treatment of capital investment and intellectual property lags competitor jurisdictions in ways that matter for long-term growth. The OECD has flagged this repeatedly. The tax gap, the difference between what's owed and what's collected, remains a focus, but closing it through enforcement is harder when the rules themselves create genuine confusion about what compliance looks like.
Reform would take years to draft and implement, likely spanning multiple governments. The risk of a half-finished overhaul, abandoned mid-cycle when priorities shift, is real. But the alternative is a tax code that continues to thicken, where each new patch makes the next reform harder and the distance from first principles grows.
Sources
Read Next
GIC rates stall as bonds retreat: why deposit accounts still lag
Why Your Employer's Life Insurance Probably Covers Less Than You Think
August Sales Fell 6.9%: What CREA's Numbers Actually Reveal About Buyer Hesitation
Canada's Resource Advantage: What Global Investors Are Betting On in 2026