Can You Write Off Utilities for a Home Office?

If you’re self-employed and part of your home works as a dedicated business space, you can write off utilities for a home office by deducting a share of your electricity, gas, water, internet, and phone costs. The IRS gives you two ways to do it: a flat simplified rate of $5 per square foot capped at $1,500, or an actual-expense calculation that multiplies your real bills by the percentage of your home the office occupies. Before either method opens up, the workspace has to pass the “exclusive and regular use” test.

Who Can Actually Claim It

The deduction is for people who file Schedule C — self-employed workers, freelancers, and independent contractors. Both homeowners and renters qualify, though renters swap mortgage interest and depreciation for a share of the rent instead.¹

If you’re a W-2 employee, you cannot deduct home office utilities on your federal return, even if you work remotely full-time and your employer reimburses nothing. The Tax Cuts and Jobs Act removed the unreimbursed employee business expense deduction starting in 2018, and the One Big Beautiful Bill Act signed in 2025 made that removal permanent.² If your only income is wages, none of what follows applies to your federal filing.

The Workspace Has to Pass Two Tests First

Utility write-offs don’t kick in until the room itself qualifies. The IRS looks for two things.

First, exclusive use. The area has to be used only for business. A spare bedroom that hosts guests on weekends is out. So is a dining table that turns back into a dining table at 6 p.m. Even occasional personal use disqualifies the space.³

Second, regular use. You have to work there on an ongoing basis, not just when a sporadic project needs a surface.³

The space also has to be your principal place of business. That’s satisfied if you do most of your substantive work there, or if it’s the only fixed spot where you handle administrative tasks like billing and scheduling — even when the actual services happen at client sites.³

The Two Ways to Claim Utility Costs

Once the workspace qualifies, you pick a method. You can switch between them from one tax year to the next, but you use only one method per year.

The Simplified Method

The simplified method pays $5 per square foot of qualified office space, up to 300 square feet, for a top annual deduction of $1,500.⁴ You don’t itemize utility bills, calculate percentages, or file Form 8829. The flat rate covers utilities, insurance, depreciation, and everything else in one number.

The trade-off is that $1,500 is a hard ceiling. If your actual costs run higher, that money is left behind. The benefit is on the back end: for any year you use the simplified method, the IRS treats depreciation as zero, so there’s nothing to recapture when you sell the home later.⁵

The Actual Expense Method

The actual expense method has you calculate the real business share of each home cost and report it on Form 8829, filed with Schedule C.⁶ This is where utilities get deducted line by line. More record-keeping, but usually a bigger deduction — especially in larger homes, in homes with high utility costs, or when mortgage interest and insurance are also being allocated.

Calculating the Business Share of Utilities

Electricity, natural gas, water, sewage, and trash pickup are indirect expenses under the actual expense method. They benefit the whole house, so you deduct only the portion tied to the office. The percentage comes from dividing the office’s square footage by the home’s total square footage.⁷

A 200-square-foot office inside a 2,000-square-foot home works out to 10%. If your combined utility bills for the year come to $4,200, the deductible share is $420. That same 10% applies to every indirect expense on Form 8829: insurance, maintenance, utilities, all use the same ratio.

Two things people get wrong. Apply the percentage to your annual total, not month by month. And measure the office and the whole home the same way — both in square feet, both using the same approach to walls and hallways. The IRS accepts any reasonable measurement method as long as you’re consistent.⁷

Phone and Internet Are Different

Communication utilities don’t use square footage. They use actual business usage — how much of the service goes to work versus personal life.

A separate business phone line or a dedicated internet connection used only for the office is 100% deductible as a direct expense. Most people share one connection for both, though. In that case you deduct the business portion only. A $120-a-month internet bill used about 60% for work gives a $72 monthly deduction. Keep something that supports the split: time logs, usage estimates, or app-based tracking.

One catch surprises people. The base cost of your first residential landline is always personal, per the IRS. Business-related long-distance charges or add-on features billed to that line are deductible, but the basic service charge itself is not.³

Cell phone costs follow the same usage-based logic. Look at your carrier statements, estimate the business share of calls and data, and deduct that portion. The IRS doesn’t require a specific tracking method, but some documentation beats none if the return draws attention.

The Income Cap You Should Know About

Your home office deduction, utilities included, cannot exceed the gross income the business earns from the home, minus other business expenses.⁸ In plainer terms, the deduction can’t be used to create or deepen a business loss.

If a freelance business grosses $8,000 for the year and non-home expenses (supplies, software, travel) come to $7,500, the home office deduction is capped at $500 no matter what the actual home costs were. Order matters within the deduction too: mortgage interest and property taxes allocable to the office come off first, then utilities and insurance, then depreciation last.³

Under the actual expense method, anything you can’t use because of the income cap carries forward to next year, where the same cap applies again.³ Under the simplified method, there is no carryforward — anything over the cap is simply lost.⁴ For businesses with uneven yearly income, that carryforward alone can be worth the extra paperwork.

What It Can Cost You Later

Choosing the actual expense method means depreciating part of your home each year. That creates a tax bill on the eventual sale. Even if your overall gain fits inside the Section 121 exclusion ($250,000 single, $500,000 joint), the portion of gain equal to the depreciation you claimed after May 6, 1997 can’t be excluded.⁹ That amount is taxed as unrecaptured Section 1250 gain at a maximum rate of 25%.¹⁰

If the office is inside the living area (a spare room, a converted dining room), you don’t have to split the sale between residential and business portions. You just recapture the depreciation. If the office sits in a separate structure like a detached garage or outbuilding, the rules tighten and you may need to allocate the gain between the two portions.⁹

This is a real argument for the simplified method in years when your deduction would be modest anyway. Simplified-method years produce no depreciation, so there’s nothing to recapture on those years later.⁵ If you expect to sell soon and the home has appreciated, recapture tax on accumulated depreciation can wipe out the benefit the actual expense method gave you.

Records to Keep

The IRS expects records supporting any deduction until the statute of limitations on that return runs — generally three years from the filing date. Underreport income by more than 25%, and the window stretches to six years. Because the actual expense method involves depreciation, property records need to be kept until the limitations period expires for the year you sell the home.¹¹

For utilities specifically, that means holding monthly bills or annual account summaries, bank or credit card statements showing payment, and any logs used to figure the business-use percentage on internet or phone service. Digital copies are fine, provided they’re legible and easy to pull up.

An audit that finds your home office deduction unsubstantiated or overstated brings a standard accuracy-related penalty of 20% of the resulting tax underpayment, on top of the tax itself plus interest.¹² Claiming a room that doesn’t actually pass the exclusive use test is exactly the kind of issue that triggers it, so the records aren’t optional.

1
Internal Revenue Service. How Small Business Owners Can Deduct Their Home Office From Their Taxes
2
Office of the Law Revision Counsel. 26 USC 67 – 2-Percent Floor on Miscellaneous Itemized Deductions
3
Internal Revenue Service. Publication 587 (2025), Business Use of Your Home
4
Internal Revenue Service. Simplified Option for Home Office Deduction
5
Internal Revenue Service. FAQs – Simplified Method for Home Office Deduction
6
Internal Revenue Service. Form 8829 – Expenses for Business Use of Your Home
7
Internal Revenue Service. Instructions for Form 8829 (2025)
8
Office of the Law Revision Counsel. 26 USC 280A – Disallowance of Certain Expenses in Connection With Business Use of Home
9
Internal Revenue Service. Selling Your Home
10
Internal Revenue Service. Topic No. 409, Capital Gains and Losses
11
Internal Revenue Service. How Long Should I Keep Records
12
Office of the Law Revision Counsel. 26 U.S. Code 6662 – Imposition of Accuracy-Related Penalty on Underpayments