Small Business Tax Deductions You Might Be Missing

March 11, 2026

If you run a small business in Canada, you are probably leaving money on the table every tax season. Not because you are doing anything wrong, but because most business owners only claim the deductions they already know about. The ones that are obvious. Rent, supplies, maybe vehicle expenses.

The less obvious deductions — the ones the CRA absolutely allows but nobody told you about — are where the real savings are.

This guide covers the most commonly missed tax deductions for Canadian small businesses, with specific notes for Northern Ontario operators.

The Deductions Most Small Businesses Already Claim

Before we get to what you are missing, here is what you are probably already tracking:

  • Office rent or workspace costs
  • Office supplies and materials
  • Employee wages and benefits
  • Accounting and legal fees
  • Advertising and marketing costs

    • If you are not tracking all of these, that is the first problem. But assuming you are, here is where the missed deductions tend to hide.

    Home Office Deduction

    If you work from home — even part-time — you can claim a proportional share of your household expenses as a business deduction. This includes:

  • Rent or mortgage interest (not the principal)
  • Property taxes
  • Utilities (heat, hydro, water)
  • Home insurance
  • Internet

    • The calculation is based on the percentage of your home used for business. A dedicated 150-square-foot office in a 1,500-square-foot house means you can claim 10% of eligible household expenses. In Northern Ontario, where heating costs run higher than the provincial average, this deduction can be significant.

    The CRA requires that the space be your principal place of business, or that you use it regularly and exclusively for meeting clients. If your spare bedroom doubles as a guest room, keep it strictly business during working hours.

    Vehicle Expenses

    This is the single most under-claimed deduction for small business owners in Sault Ste. Marie and across Northern Ontario. Businesses here cover large service areas. Driving to client sites in Wawa, Blind River, or Elliot Lake adds up fast.

    You can deduct vehicle expenses based on business-use percentage:

  • Fuel
  • Insurance
  • Maintenance and repairs
  • Licence and registration
  • Lease payments or capital cost allowance (CCA) on purchased vehicles
  • Parking and tolls

    • The key: You need a logbook. Track your business kilometres for at least one full year to establish your business-use percentage. The CRA will ask for this in an audit. If you do not have a logbook, your vehicle deduction is at risk.

    For year-end preparation, having a complete vehicle log can mean the difference between a routine filing and a stressful reassessment.

    Meals and Entertainment

    You can deduct 50% of meals and entertainment expenses when they are directly related to earning business income. That lunch meeting with a potential client at a restaurant downtown? Half of it is deductible.

    What counts:

  • Client meals where business is discussed
  • Team meals during mandatory overtime
  • Food at business events or trade shows

    • What does not count: your daily coffee run. The expense has to be tied to a specific business purpose.

    Bad Debts

    If a client owes you money and you have made reasonable efforts to collect but cannot, you can write off that bad debt as a deduction. This applies to accounts receivable that have become uncollectible.

    Many small businesses in Sault Ste. Marie deal with this, especially in construction and trades where project disputes can leave invoices unpaid. Your bookkeeper should be tracking aging receivables so bad debts are properly documented.

    Professional Development and Training

    Courses, certifications, conferences, and workshops related to your business are fully deductible. This includes:

  • Online courses and webinars
  • Industry conferences (including travel costs to attend)
  • Professional certifications and licence renewals
  • Books and subscriptions related to your field

    • If you pay for an employee's training, that is also deductible as a business expense.

    Business Insurance Premiums

    Beyond basic liability insurance, many business owners forget to claim:

  • Professional liability (errors and omissions) insurance
  • Cyber liability insurance
  • Key person insurance premiums
  • Business interruption insurance

    • These are all fully deductible in the year they are paid.

    Capital Cost Allowance (CCA)

    When you buy equipment, furniture, computers, or vehicles for your business, you cannot deduct the full cost in the year of purchase (with some exceptions). Instead, you claim a percentage each year through the Capital Cost Allowance system.

    Common CCA classes for small businesses:

  • Class 8 (20%): Office furniture, equipment, fixtures
  • Class 10 (30%): Vehicles, automotive equipment
  • Class 10.1 (30%): Passenger vehicles over $37,000
  • Class 50 (55%): Computer hardware and systems software
  • Class 12 (100%): Software under $500, tools under $500

    • The Accelerated Investment Incentive allows you to claim up to 1.5 times the normal CCA rate in the first year for eligible assets. Ask your accountant whether this applies to recent purchases.

    What Northern Ontario Businesses Often Miss

    There are a few deductions that tend to be specific to businesses operating in our region:

  • Travel to remote clients: If your service area covers Algoma District, those kilometres add up. Track them.
  • Shipping and freight: Businesses that serve a large geographic area often absorb higher shipping costs. Fully deductible.
  • Seasonal business expenses: Costs incurred to maintain your business during off-season (for tourism, landscaping, or construction businesses) are still deductible.
  • Northern Ontario Heritage Fund grants: Some grants are taxable, some are not. Know which category yours falls into before filing.

    • How to Make Sure You Are Not Missing Anything

    The simplest way to catch missed deductions is to have a professional review your expenses before filing. At Fusion Financial, we help Sault Ste. Marie businesses with monthly bookkeeping and financial reporting specifically so that nothing slips through the cracks at year-end.

    If your records are a mess, our Tax Titan program can help you get organized and file with confidence.

    Not sure where you stand? Get a free quote and we will review your situation.