Look, here’s the thing about taxes that nobody talks about. You’re out there grinding. Running your business in Oshawa or Whitby or Ajax, working crazy hours, dealing with clients, doing the hard stuff. And then you hand your receipts to your accountant once a year and just hope for the best. That’s what most people do. And it’s insane.
Because most small business owners we work with in Durham Region? They’re leaving like $5,000 to $15,000 a year in legitimate deductions just sitting there. Money the government is literally saying you can keep. And nobody told them.
That’s nuts. So let’s fix it.
1. Your home office. And yes, even if you rent.
This one blows people’s minds. If you work from home, even part of the time, you can deduct a chunk of your rent, your mortgage interest, your utilities, your home insurance, like all of it. Not just your internet bill. The whole thing.
Here’s how it works. You measure the space you use for work. You divide that by your total square footage. That’s your percentage. Done. If your office is 150 square feet and your house is 1,500, that’s 10%. You deduct 10% of everything.
A 10% home-office split on $23,880 of housing costs
| Rent or mortgage interest | $18,000 | $1,800 |
| Utilities (heat, hydro, water) | $3,600 | $360 |
| Home insurance | $1,200 | $120 |
| Internet | $1,080 | $108 |
| Total | $23,880 | $2,388 |
That’s almost $2,400. Just for working where you already live. You’re literally just measuring a room.
And here’s the crazy part. If you’re incorporated, your corporation can reimburse you for these expenses, and that reimbursement is tax-freeto you personally and deductible for the corporation. It’s like a double win. Most business owners in Durham Region have no idea this exists.
You just need to keep records of your measurements and hang onto your bills. If you’re an employee of your own corp, you’ll need a T2200 form on file. That’s it.
2. Vehicle expenses. This one’s huge.
OK so this is the one that really gets me. If you drive for business, going to see clients, picking up supplies, heading to a job site, whatever, those kilometres are deductible. Every single one.
But here’s what happens. People go, “Well, I also use my car for personal stuff, so I probably can’t claim anything.” That’s not true. You absolutely can. You just need to track business versus personal use.
Option A. Use the CRA mileage rate.
For 2026, it’s 73¢ per kilometre for your first 5,000 business km, then 67¢ after that. So if you drive 15,000 business km in a year:
- First 5,000 km × $0.73 = $3,650
- Next 10,000 km × $0.67 = $6,700
- Total deduction: $10,350
Over ten grand. Just from driving.
Option B. Track actual expenses.
Gas, insurance, maintenance, lease payments, all of it. Multiply by your business-use percentage. More paperwork, but often a bigger number.
Think about a contractor in Pickering driving job sites all over Durham Region. 20,000 business km a year is realistic. That’s over $13,000 in deductions.
Here’s what you do. Download a free mileage tracking app. Takes 30 seconds per trip. Date, destination, purpose, kilometres. That’s it. The CRA wants a logbook, so you give them a logbook. 30 seconds a trip for thousands of dollars back. That’s the best return on investment you’ll ever get.
3. Meals and entertainment. The 50% rule.
Took a client out for lunch? Had coffee with someone you might do business with? That’s 50% deductible. Half of it. Right off the top.
But here’s where people screw it up. The CRA wants three things:
- An actual receipt (not just your credit card statement).
- Who you ate with (name and business relationship).
- What you talked about (a quick note like “discussed project timeline”).
That’s it. Three things. But most people either don’t write down who they were with, or they skip the whole claim because they think it’s too small to matter.
Really? Let’s do the math. You spend $200 a month on business meals. That’s $2,400 a year. At 50%, you’re deducting $1,200. That’s real money. And all you had to do was flip the receipt over and write two lines.
100% deductible, not 50%
Staff holiday party · company-wide team lunch · meals at a remote work site. If you threw a Christmas lunch for your crew in Oshawa last December and didn’t claim the full thing, that’s money you just gave away.
4. Professional development and training.
This one is so straightforward it almost feels too good to be true. Every course, every certification, every workshop, every conference, every book you buy to get better at what you do? 100% deductible. All of it. No cap.
Online courses. Industry conferences. Association dues. Books and subscriptions. Exam fees. Even the travel to get to the conference.
Real example. You’re a real estate agent in Whitby. You take a $2,000 marketing course. You pay $500 in association dues. You buy $300 in books. You attend a $1,500 conference. That’s $4,300. Fully deductible.
The Canada Training Credit
If you’re between 25 and 65 and your income is under about $150,000, you accumulate $250 a year (up to $5,000 lifetime) that you can use to cover 50% of eligible tuition and exam fees. A credit on top of the deduction. Go to CRA My Account right now and check your balance. You might have hundreds or even thousands of dollars sitting there.
5. Health spending through your corporation.
Last one. And honestly? This might be the biggest one on the list. If you’re incorporated, you can set up something called a Private Health Services Plan (PHSP), sometimes called a Health Spending Account.
Here’s the deal. Your corporation pays for your medical and dental expenses (glasses, dental work, physiotherapy, prescriptions, therapy, all of it) and deducts them as a business expense. The reimbursement to you? Tax-free. Zero personal tax.
A $3,000 dental bill paid personally needs $5,000–$6,000 of pre-tax income to cover. Through a PHSP, the corporation pays $3,000, deducts the full amount, and you owe nothing personally.
The catch (and there’s always a catch) is that it needs to be set up properly. Documented, reasonable, covering eligible expenses. But once it’s in place, it works year after year.
If you’re incorporated and you’re paying for medical stuff out of your own pocket, this is probably the single biggest thing you’re missing.
So what are all five worth?
Let’s add it up for a typical small business owner in Durham Region:
| Home office | $2,000 – $4,000 |
| Vehicle expenses | $5,000 – $13,000 |
| Meals and entertainment | $800 – $2,000 |
| Professional development | $1,000 – $5,000 |
| Health spending (incorporated) | $2,000 – $6,000 |
| Total | $10,800 – $30,000 |
Even on the low end, that’s over $10,000 in deductions. At a marginal tax rate of 30–40%, that’s $3,000 to $12,000 back in actual cash. Every year. Year after year.
Most people aren’t missing these because they’re doing something wrong. They’re missing them because nobody sat down and explained it. That’s all this is. Just information.
What to do right now.
You don’t need to overhaul your whole system. Just pick one:
- Download a mileage app and start tracking your drives. Today.
- Measure your home office. Do the math.
- Start writing who you ate with on every business meal receipt.
- Log into CRA My Account and check your Canada Training Credit.
- If you’re incorporated, ask your accountant about a Health Spending Account.
That’s it. Start with one. You can figure out the rest later.
And if you want someone to look at the whole picture, we do this every day. It’s the core of our small business tax and accounting services. We work with business owners across Oshawa, Whitby, Ajax, Pickering and the rest of Durham Region, and a quick review almost always turns up money people didn’t know they were leaving behind.
Want a second pair of eyes? Book a free 15-minute call. We’ll walk through what you might be missing. No pitch. Just the numbers.
This article is for general information only and doesn’t replace professional tax advice. Tax rules change, and your specific situation matters. Always confirm with a qualified CPA before making tax decisions.
