You answer client emails at the kitchen table before anyone else wakes up. You finish proposals at night. Maybe you even have a room set aside for running the business. So when tax season arrives, it’s natural to ask: “Can I write off my home office?”

The answer might be yes—but it depends on how you use the space and how your business is taxed. And the biggest mistake is assuming that working from home automatically makes part of your mortgage or rent deductible.

Self-employed taxpayers may qualify for a home office deduction when they use part of their home regularly and exclusively for qualifying business purposes and meet the applicable business-use requirements. W-2 employees generally cannot claim the federal home office deduction as an unreimbursed employee expense under current federal rules. Owners who work for their S corporation generally should evaluate a properly documented employer reimbursement arrangement instead of simply claiming Form 8829 on their personal return. State treatment may differ.

That distinction matters. The same desk can lead to very different tax treatment depending on whether you are a sole proprietor, an employee, or an S corporation shareholder-employee.

Exclusive use: Is the space truly for business?
In most cases, the area must be used only for business—not as a guest bedroom on weekends, a family TV room at night, or a dining table where everyone eats. The space does not necessarily need a separate door or a whole room, but it must be identifiable and used exclusively for qualifying business activity. There are limited exceptions, including certain inventory-storage and daycare situations.

Picture a spare bedroom with your desk, files, and business equipment, used only for your company. That is very different from a laptop on the living-room couch. The difference is not how many hours you work—it is how the space is actually used.

Regular use: Is this part of how you operate?
An occasional evening of paperwork usually is not enough. You need to use the area consistently for business. Keep a simple record of what work happens there and why the space is necessary.

You do not always need to perform every business task at home. A home office can qualify as a principal place of business if you use it regularly and exclusively for administrative or management activities and have no other fixed location where you conduct substantial administrative or management activities. Other qualifying business uses—such as meeting clients in the normal course of business—may also apply.

Consider an HVAC contractor who spends most days visiting jobsites but handles scheduling, invoicing, payroll, and vendor calls from a dedicated home office. The fact that the actual service work happens elsewhere does not automatically disqualify the home office. What matters is the complete set of facts, including whether another fixed office handles those management tasks.

A second business location, coworking space, or company office can change the analysis. Don’t assume that a home office qualifies merely because it is convenient.

If you qualify as a self-employed taxpayer, there are generally two ways to calculate the federal home office deduction: the simplified method and the actual-expense method. You choose the method under the applicable rules for the year; you cannot deduct the same costs twice.

Simplified method: Easier, but not always larger
The IRS simplified method generally allows $5 per square foot of qualified home office space, up to 300 square feet, for a maximum of $1,500 annually, subject to its rules and limitations. It avoids allocating most actual home expenses and generally does not involve home depreciation for the years this method is used.

Those are deduction amounts—not refunds or dollar-for-dollar tax savings. The tax benefit depends on your circumstances, and the deduction may be limited by business income.

Actual-expense method: More records, potentially more benefit
Under the actual method, qualifying direct office costs may be fully attributable to the workspace, while shared home costs generally must be allocated using a reasonable business-use percentage, often based on square footage. Depending on the facts, costs may include utilities, homeowners or renters insurance, repairs, rent, mortgage interest, property taxes, and depreciation of the home’s eligible business-use basis.

Not every payment is deductible. Mortgage principal is not a home office expense; personal living expenses are not business expenses. Special allocation and limitation rules apply to interest, property taxes, casualty losses, and depreciation. Home depreciation can also affect the tax consequences when you eventually sell the property.

Suppose your home is 2,000 square feet and your dedicated office is 200 square feet. Your business-use percentage would generally be 10%. For illustration, assume $12,000 in eligible shared expenses before any separately calculated home depreciation or other adjustments.

In this simplified comparison, the actual-expense amount is $200 higher before considering depreciation, limitations, and other tax consequences. That does not automatically make it the better method. The actual method requires more documentation, and depreciation may matter when the home is sold. The right choice depends on your full tax picture.

This is where a lot of business owners get tripped up. If you operate through an S corporation and perform services as its employee, the company and you are separate taxpayers. You generally should not treat the corporation’s business expenses as if they were your sole proprietorship expenses on Schedule C or simply claim a personal Form 8829 deduction for work performed as its employee.

A common approach is to have the S corporation adopt and properly administer an accountable plan to reimburse substantiated, qualifying home office expenses. The company needs a business connection for the expense, timely documentation, and a process for returning excess advances. The reimbursement should reflect the corporation’s actual business use and applicable rules—not an arbitrary monthly amount labeled “home office.”

For example, an owner who works from a dedicated room might document the office square footage, total home square footage, eligible shared expenses, and business purpose. The corporation then evaluates what amount can properly be reimbursed and records it correctly. The tax treatment of rent, mortgage interest, property taxes, and depreciation needs special attention to avoid duplicate deductions or incorrect reporting.

The accountable plan is not a shortcut to deducting personal housing costs. It is a compliance framework for reimbursing legitimate employee business expenses. Have the plan and calculation reviewed before payments begin.

Working remotely does not, by itself, create a federal home office deduction. Under current federal rules, most W-2 employees cannot deduct unreimbursed home office expenses on their individual federal returns. Your employer may be able to reimburse eligible business expenses under an accountable plan, and some states have different rules or reimbursement requirements.

If you work remotely for someone else, ask about the employer’s reimbursement policy rather than assuming you can claim part of your rent or utilities on your Form 1040.

You do not need an elaborate binder, but you do need a calculation you can explain. A few consistent records are far more useful than trying to reconstruct your workspace and bills when you are already preparing the return.

• A floor plan, measurements, and photographs showing the dedicated business-use area
  Records of how the space is used and why it qualifies
• Utility, rent, insurance, property tax, mortgage interest, repair, and other relevant statements
• Documentation of direct office-only costs and shared expenses
• Business-use percentage and annual calculation for the method selected
• For S corporations: written accountable-plan terms, expense substantiation, approval, and reimbursement records
• Records of home improvements and depreciation when the actual method applies

• Claiming a guest bedroom or kitchen table that is also used personally, despite the general exclusive-use requirement
• Using the home’s entire mortgage payment as a deductible business expense
• Assuming that working long hours at home automatically makes it a principal place of business
• Using the simplified $5-per-square-foot calculation without checking eligibility or limitations
• Deducting the same expenses personally and again through an S corporation reimbursement
• Ignoring depreciation records and possible home-sale consequences under the actual method
• Reimbursing an S corporation owner a flat amount without an accountable-plan process
• Using outdated advice about employee home office deductions or state-specific rules

Before you remodel a room, begin an S corporation reimbursement program, or file a return that includes home office expenses. It is especially worth reviewing if you have more than one business, split time between home and another office, own an S corporation, or expect to sell your home in the next few years.

A good planning conversation should answer more than “Can I deduct this?” It should also answer “Which method is appropriate, what documentation do I need, how much might it actually save, and are there consequences I should understand first?”

When you run a business, you make decisions all day about customers, employees, pricing, and cash flow. You should not have to rely on a social media tip to decide how to handle a deduction that can affect your tax return—and, in some cases, the sale of your home.

At Profit Wise Accounting & Tax, we help business owners look beyond a single write-off. We review how your business is structured, which expenses may qualify, and how to document decisions so your tax strategy makes sense for the whole business.

Not sure whether your home office qualifies—or whether your S corporation should reimburse you? Let’s review the facts, compare the options, and identify the next steps before you file.

Educational information only. Tax law and state treatment can change; eligibility depends on individual facts. This article is not a substitute for advice based on your records