Can You Write Off Utilities for a Home Office?

If you’re self-employed and part of your home is set aside for work, you can write off utilities for a home office — a share of your electricity, gas, water, sewage, trash, internet, and phone costs — either by claiming a flat $5 per square foot under the IRS simplified method or by calculating the real business percentage of each bill under the actual expense method. Employees who get a W-2 cannot take this deduction on their federal return, even if they work from home full-time.

Who Can Claim It

The home office deduction, utilities included, belongs to self-employed people and independent contractors who file Schedule C. Both homeowners and renters qualify. Renters fold a portion of rent into the calculation; homeowners instead claim a share of mortgage interest and depreciation.¹

If your only income is W-2 wages, stop here. The Tax Cuts and Jobs Act eliminated the deduction for unreimbursed employee business expenses starting in 2018, and the One Big Beautiful Bill Act signed in 2025 made that elimination permanent.² Working remotely for an employer that doesn’t reimburse you doesn’t change the answer at the federal level. Some states still allow a version of the deduction on state returns, but federally, the door is closed.

The Workspace Has to Qualify First

Before any utility bill becomes deductible, the space itself must meet two IRS tests. It has to be used exclusively for business, and it has to be used regularly.³

Exclusive use is strict. A spare room that works as a guest bedroom on weekends does not qualify. The kitchen table where you also eat dinner does not qualify. The area has to be set aside for work and nothing else. Regular use means what it sounds like: ongoing, not a few hours a month when a project happens to land.

The space also has to be your principal place of business. That can mean the location where you do most of your substantive work, or the only fixed place where you handle administrative tasks like billing, scheduling, and bookkeeping. A plumber who does the actual work at client homes but handles all paperwork from a dedicated room at home still meets the principal-place test.³

The Two Methods

Once the workspace qualifies, you choose how to calculate the deduction. You can switch methods from one year to the next, but only one applies per tax year.

The Simplified Method

The simplified method gives you $5 per square foot of qualifying office space, up to 300 square feet, for a maximum deduction of $1,500 a year.⁴ That single flat number stands in for all of it: utilities, insurance, depreciation, the works. You don’t list bills, allocate percentages, or file Form 8829.

The ceiling is real. If your actual costs exceed $1,500, the extra is gone. The payoff is simplicity, and a second benefit most people overlook: the IRS treats depreciation as zero for any year you use the simplified method, so those years create nothing to recapture when you eventually sell the home.⁵

The Actual Expense Method

The actual expense method is where utility deductions happen line by line. You report real costs on Form 8829 filed with Schedule C, allocating each household expense between business and personal use.⁶ The paperwork is heavier. The deduction is often substantially larger, especially if your home is big, your utilities run high, or you have significant mortgage interest and insurance to allocate.

Figuring the Business Share of Utility Bills

Under the actual expense method, electricity, natural gas, water, sewage, and trash are indirect expenses. They serve the whole house, so you deduct the portion that corresponds to the office. The ratio is simple: office square footage divided by total home square footage.⁷

A 200-square-foot office in a 2,000-square-foot home gives you a 10% business percentage. If your combined utility bills for the year run $4,200, the deductible share is $420. That same 10% applies across all indirect home expenses on Form 8829 — insurance, maintenance, utilities — using one consistent ratio.

Two things that trip people up. Apply the percentage to your total annual utility costs, not to each monthly bill separately. And measure the office and the home the same way, in the same units, with the same methodology. The IRS accepts any reasonable approach as long as you stay consistent.⁷

Phone and Internet Follow Different Rules

Communication costs don’t use square footage. You allocate them based on how much of the service you actually use for business.

A dedicated business line or a separate internet connection used exclusively for work is 100% deductible as a direct expense. More often, one connection serves both work and personal use, and you deduct only the business share. If you use a $120 monthly internet plan roughly 60% for work, your deduction is $72 a month. Keep something that supports the split: usage logs, estimates based on your schedule, or app-based tracking.

One quirk catches people off guard. The IRS treats the base charge for the first residential telephone landline as a personal expense, period. Business long-distance calls and work-related add-on features billed to that line are deductible, but the base service charge is not.³ Cell phones follow the usage-based approach: review your statements, estimate the business share of calls and data, and deduct that portion.

The Income Cap That Can Erase the Deduction

Your home office deduction, utilities and all, cannot exceed the gross income your business brings in from the home after your other business expenses are subtracted.⁸ In plain terms, the deduction can’t create a business loss or make an existing one worse.

If your freelance business grosses $8,000 and your non-home expenses (software, supplies, travel) total $7,500, your home office deduction is capped at $500 no matter what your actual home expenses are. The IRS also sets an order: mortgage interest and property taxes allocable to the office apply first, then utilities and insurance, then depreciation last.³

Under the actual expense method, any amount you can’t use this year carries forward to next year, where the same limit applies again.³ Under the simplified method, there is no carryforward. Anything over the gross income limit is lost.⁴ If your business income swings a lot from year to year, that carryforward alone can justify the extra paperwork.

What Happens When You Sell the Home

The actual expense method includes depreciating part of your home each year, and that depreciation creates a tax bill when you sell. Even if your overall gain falls within the Section 121 exclusion of $250,000 for single filers or $500,000 for married couples filing jointly, you cannot exclude the portion of gain equal to depreciation claimed after May 6, 1997.⁹ That amount is taxed as unrecaptured Section 1250 gain at a maximum rate of 25%.¹⁰

This is why the simplified method isn’t just for people with small offices. Because it treats depreciation as zero, simplified-method years produce nothing to recapture.⁵ If you plan to sell within a few years and your home has appreciated meaningfully, the recapture tax on accumulated depreciation can outweigh the extra deduction the actual expense method gave you.

Records to Keep

Hold on to records supporting any deduction until the statute of limitations on that return expires, generally three years from the filing date. If you underreport income by more than 25%, that stretches to six years. Property records tied to depreciation need to be kept until the limitations period expires for the year you sell the home.¹¹

For utilities, that means monthly bills or annual account summaries, bank or credit card statements showing payment, and whatever logs or estimates you used to set the business-use percentage for phone and internet. Digital copies are fine as long as they’re legible and you can pull them up on demand.

If an audit finds the deduction unsubstantiated or overstated, the accuracy-related penalty is 20% of the resulting underpayment, on top of the tax owed and interest.¹² Claiming a workspace that doesn’t actually meet exclusive use is one of the quickest ways to invite that result.

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