For years, the home office deduction had a reputation for being an IRS audit trigger. The good news is that this is no longer the case. The IRS now recognizes that many small business owners legitimately work from home, and the deduction has become a common and valuable tax break for Schedule C filers.
What Qualifies as a Home Office
A home office does not have to be a traditional office setup with a desk and computer. It can be any space used regularly and exclusively for your business, such as a spare bedroom, a section of your garage, or a storage area if you keep inventory or supplies there. The most important rule is regular and exclusive use.
If the space serves both business and personal purposes, it will not qualify.
Measuring Your Space the Right Way
At Oly Tax, we take a more precise approach to calculating the home office deduction. While most people measure their home office space from the interior, the real estate industry, and most building plans, measure square footage by the exterior of the home. That means you can include the thickness of your walls when determining your office’s percentage of total home use.
This method gives you a truer picture of what percent of your home is used in your business. Round your measurements to the nearest half foot for simplicity. Since most walls are about six inches thick, you can safely add the full thickness of exterior walls and about half the thickness of interior walls when making your calculations.
If your workspace has an irregular shape or angles, draw it out, and our team at Oly Tax LLC can help you calculate the area accurately.
Simplified vs. Actual Expense Method
The IRS provides two ways to calculate your home office tax deduction:
Simplified Method
Allows a deduction of $5 per square foot, up to 300 square feet. This method is easy to use, but it caps your deduction at $1,500. It also allows you to continue deducting your mortgage interest and property taxes on Schedule A if you already itemize.
Actual Expense Method
Often results in a larger deduction, particularly for taxpayers living in areas with high housing costs like the Pacific Northwest. This method applies the percentage of your home used for business to your real expenses, including mortgage interest, utilities, insurance, and maintenance costs.
If you choose the simplified method, you do not have to worry about keeping track of depreciation. However, since it is limited to 300 square feet, most taxpayers with a larger space benefit more from the actual expense method.
Storage Space Counts Too
If you use part of your home to store inventory or product samples, that area may also qualify for the home office deduction, even if it is not used exclusively as an office. This is an often-overlooked opportunity for small business owners who manage inventory from home.
Let Oly Tax LLC Help You Get It Right
The home office deduction is a great way to lower your self-employment taxes and maximize your business deductions. But to do it correctly, you need accurate measurements and a clear understanding of the IRS rules.
At Oly Tax LLC, we help business owners calculate their home office deduction correctly, choose the best method, and document their expenses to ensure compliance. Whether you are new to self-employment or have claimed the deduction for years, we can make sure you are getting the most out of it.
Get your taxes done right with Oly Tax! Contact us today to schedule your appointment and find out how much you could save with professional home office deduction help in Olympia and throughout the Pacific Northwest.


