This article is based on a presentation originally delivered by Jordan Brown (CPA, CA) for the SK Startup Institute, where he breaks down common misconceptions around business write-offs and how they actually work in practice.
At some point, most business owners hear the same advice:
“Just write it off.”
It usually comes up when buying something for the business — a laptop, software, equipment, or even meals and travel. The assumption is simple: if it’s a write-off, it must somehow be covered or reimbursed.
That’s not how it works.
A write-off is simply a business expense that reduces your taxable income. It does not refund your purchase or make something free. If you spend money in your business, that money is still gone. The only benefit is that you may pay less tax on the income used to pay for it.
That distinction matters more than most people realize, because it shapes how you make decisions.
Why This Gets Misunderstood
Early on, many entrepreneurs connect write-offs directly to savings. It feels like there is an incentive to spend, especially near the end of the year.
You’ll hear things like:
- “Should I buy this now so I can write it off?”
- “Can I expense this?”
Those questions focus on the tax outcome instead of the business decision.
A better way to think about it is simpler:
Does this expense help the business operate, grow, or earn income?
If the answer is no, the write-off doesn’t change much. You are still spending money that didn’t need to be spent.
Where Things Start to Blur
Some expenses are straightforward. Rent, software, insurance — these clearly belong to the business.
Others are less clean.
A vehicle, a phone, a home office, even meals — these often sit in between personal and business use. This is where most confusion happens, and where most mistakes start.
You cannot claim something fully just because it is used “sometimes” for work. Only the portion that relates to earning business income is considered an expense.
That means you need a way to show how it’s being used.
For example:
- A vehicle requires mileage tracking
- A home office needs a defined workspace and reasonable use
- A phone or internet bill should be split based on usage
Without that level of clarity, even reasonable claims become difficult to support.
What Actually Qualifies as a Business Expense
At a basic level, a business expense needs to meet a few conditions. It should be tied to earning income, reasonable for the type of business, and supported by records.
That sounds simple, but it’s where people often push the boundaries.
Expenses that are clearly personal — like everyday clothing, commuting, or gym memberships — are not deductible, even if they feel indirectly related to your work. Trying to include them usually creates more risk than benefit.
On the other hand, most core operating costs are fine:
- Advertising and marketing
- Rent and utilities
- Office supplies and software
- Professional fees
- Wages or subcontractors
The difference is not complexity. It’s clarity.
The End-of-Year Spending Trap
One of the most common patterns shows up at year-end.
Business owners start thinking about taxes and look for ways to reduce them. That often leads to last-minute purchases that weren’t planned or needed.
The logic sounds reasonable:
“If I’m going to pay tax anyway, I might as well buy something and write it off.”
But that only works if the purchase already makes sense for the business.
Spending $1,000 to reduce your tax bill by a fraction of that still leaves you with less money overall. A write-off should never be the reason you spend money. It should only be a side benefit of a decision you would have made anyway.
Not All Expenses Work the Same Way
Another point that often gets overlooked is that not every expense is treated the same.
Some costs are immediate and recurring — things like rent, utilities, and subscriptions. These are typically accounted for in the same year.
Others provide longer-term value — equipment, vehicles, furniture. These are usually handled differently and written off over time.
You don’t need to understand all the tax rules behind this, but it helps to know that timing and classification matter. This is often where an accountant can provide clarity before small mistakes turn into larger ones.
The Role of Record-Keeping
Most issues with write-offs don’t come from trying to do something wrong. They come from not keeping track of things properly.
Good record-keeping makes everything easier — not just at tax time, but throughout the year.
At a minimum, that means:
- Keeping receipts (physical or digital)
- Separating business and personal spending
- Tracking mileage where applicable
- Using a simple bookkeeping system
If you can’t support an expense, it becomes difficult to claim confidently.
This is also where bookkeeping becomes more than just an administrative task. It gives you a clear picture of how your business is actually operating.
Why This Matters Beyond Taxes
Write-offs are often treated as a tax topic, but they affect much more than that.
Your expenses shape your business. They influence your pricing, your margins, and your ability to stay financially stable. If those numbers are unclear or inconsistent, it becomes harder to know whether your business is working.
This is why understanding expenses early is so important. It builds a stronger foundation for everything that comes next.
Where This Fits in the Bigger Picture
When someone is unsure about what they can write off, it usually points to a larger gap.
They may not have a clear view of their costs, or their financials may not be fully set up. In many cases, it ties back to business planning.
This is where tools like the Business Plan Template and Business Plan Checklist can help. They force you to think through what your business actually costs to run, not just what can be deducted later.
The Startup Checklist can also help connect these pieces, especially early on.
Final Thought
A write-off is not a reward.
It’s a reduction.
It reduces your taxable income, but it doesn’t replace good decision-making. If you understand that early, you avoid one of the most common misconceptions in business — and you make stronger financial decisions because of it.