If you’re self-employed, you deduct communication expenses on taxes by claiming the business-use portion of your phone, internet, software subscriptions, and related costs on Schedule C as ordinary and necessary business expenses. If you’re a W-2 employee, the federal deduction for unreimbursed job expenses is gone, and the One Big Beautiful Bill Act of 2025 made that elimination permanent. Which group you fall into decides almost everything that follows.
What Counts as a Communication Expense
The IRS allows deductions for costs that are “ordinary and necessary” to your trade or business, meaning common in your industry and helpful to your work.1Office of the Law Revision Counsel. 26 U.S. Code 162 – Trade or Business Expenses For communication, that generally covers:
- Monthly charges for a business mobile line, a dedicated business landline, or the business-use share of a personal line
- Home broadband, mobile data plans, and co-working Wi-Fi fees used for work
- Software subscriptions like video conferencing, business email hosting, team messaging, CRM, and project management tools
- Roaming charges, international calling plans, and data fees on business trips, which are deductible as business travel expenses2Internal Revenue Service. Topic No. 511, Business Travel Expenses
Business use is the qualifier. A Slack subscription used only for client work is fully deductible. A home internet line you also use to stream movies has to be split between business and personal use.
How Self-Employed Filers Claim the Deduction
If you’re a sole proprietor, single-member LLC, or otherwise self-employed, communication expenses go on Schedule C (Form 1040) as direct business expenses.3Internal Revenue Service. Instructions for Schedule C (Form 1040) – Section: Part II. Expenses They reduce your net business profit before both self-employment tax and income tax, so each deductible dollar saves you roughly 15.3 cents in self-employment tax on top of your income tax rate.
These are above-the-line deductions. You claim them whether or not you itemize, and there’s no minimum threshold. You also don’t need to qualify for the home office deduction to write off the business share of your phone or internet.
The First Phone Line Rule
One trap catches people. Federal tax law treats the base cost of the first telephone line into your home as a personal expense, even if you use it partly for business.4Office of the Law Revision Counsel. 26 U.S. Code 262 – Personal, Living, and Family Expenses The Schedule C instructions confirm you cannot deduct the base rate, including taxes, of that first line.5Internal Revenue Service. Instructions for Schedule C (Form 1040)
What you can deduct are incremental costs above that base rate: long-distance business calls, added data for business use, or features like call waiting you need for client calls. A second line used for business is different. Its entire cost, base rate included, is deductible based on the percentage of business use. This is where a dedicated business number pays for itself at tax time.
Deducting Hardware and Equipment
The rules above cover ongoing service. Buying the hardware itself (smartphones, routers, laptops, headsets) follows different rules, and for 2026 those rules are generous. You have three main paths:
- Section 179 expensing lets you deduct the full purchase price of qualifying business equipment in the year you buy it, up to $2,560,000 for tax years beginning in 2026. Most communication hardware sits well under that ceiling.
- The One Big Beautiful Bill Act restored permanent 100% first-year bonus depreciation for qualified property acquired after January 19, 2025. A router, phone, or laptop bought for business use can be fully written off in year one.6Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One Big Beautiful Bill
- The de minimis safe harbor lets you expense items costing $2,500 or less per item without capitalizing them if you don’t have audited financial statements. With audited statements, the threshold is $5,000 per item. A $1,200 phone or a $300 router fits comfortably inside the lower threshold.
Mixed-use devices only qualify for the business-use percentage. A phone used 70% for business means 70% of the purchase price is deductible.
Splitting Business and Personal Use
Most people run business and personal life through the same phone and internet connection. You need a reasonable allocation method and you need to apply it consistently.
For phone service, track business call time as a share of total call time, or count business calls as a share of total calls. If 60% of your call time is business, 60% of the bill is deductible. For internet, a time-based split is simplest: 100 business hours out of 200 total means 50% of the bill is deductible.
The IRS doesn’t require one specific method, but whatever you choose has to be logically defensible. A consultant claiming 95% business use on a phone loaded with Netflix and personal social media will draw skepticism. Be honest with the split, and keep a contemporaneous log, meaning you record usage at or near the time it happens rather than reconstruct it from memory at year end.
Recordkeeping
The IRS expects you to substantiate any communication expense you deduct. For service costs, that means itemized bills showing the amount, date, and nature of each charge. For hardware, keep the receipt and a note of the business purpose. Digital records are fine. The IRS has recognized electronic storage as equivalent to paper since 1997, as long as copies are accurate, legible, and retrievable on request.7Internal Revenue Service. Revenue Procedure 97-22
Keep receipts, bills, and usage logs for at least three years from the date you file the return claiming the deduction. If you file before the due date, the return is treated as filed on the due date.8Internal Revenue Service. How Long Should I Keep Records That covers the standard audit window. If you substantially underreport income the IRS has six years, so holding records longer is a reasonable precaution for complex returns.
If You’re a W-2 Employee
The picture is bleaker here. The Tax Cuts and Jobs Act suspended the deduction for unreimbursed employee business expenses starting in 2018, and the One Big Beautiful Bill Act made that suspension permanent.9Office of the Law Revision Counsel. 26 U.S. Code 67 – 2-Percent Floor on Miscellaneous Itemized Deductions If you pay for your own phone or internet to do your W-2 job, there is no federal deduction available, and one isn’t coming back.
The narrow exceptions are Armed Forces reservists, qualified performing artists, fee-basis state or local government officials, and employees with impairment-related work expenses. These groups can still use Form 2106 to claim certain employee business expenses.10Internal Revenue Service. Instructions for Form 2106 (Employee Business Expenses) Everyone else is shut out at the federal level.
Accountable Plans
The one practical route to tax-free relief for employees is an employer accountable plan. When your employer reimburses communication costs under a plan that meets IRS requirements, the reimbursement is excluded from your taxable income and doesn’t appear as wages on your W-2.11Internal Revenue Service. IRS Publication 5137 – Fringe Benefit Guide
An accountable plan has to satisfy three requirements:12eCFR. 26 CFR 1.62-2 – Reimbursements and Other Expense Allowance Arrangements
- Business connection: the expense relates to services you performed as an employee
- Substantiation: you document the expense with receipts or records within a reasonable time
- Return of excess: you return any reimbursement above the substantiated amount within a reasonable time
Miss any of the three and the IRS treats the arrangement as non-accountable, meaning the reimbursement becomes taxable wages subject to income and payroll taxes. A flat monthly stipend with no documentation requirement and no obligation to return unused funds is taxable income.
State Reimbursement Laws
Even with no federal deduction, several states require employers to reimburse employees for business use of personal devices. California, Illinois, Montana, and Iowa have broad reimbursement mandates. New York and Massachusetts have narrower requirements tied to conditions like income thresholds or contractual obligations. The exact rules vary widely. If your employer expects you to use a personal phone or internet connection for work and won’t reimburse you, it’s worth checking your state’s labor laws.
A handful of states also still let employees deduct unreimbursed business expenses on their state returns, independent of the federal rules. That won’t touch your federal bill, but it can reduce your state tax.
What Happens If You Get It Wrong
Claiming personal communication costs as business expenses triggers penalties. The IRS imposes a 20% accuracy-related penalty on the portion of any tax underpayment caused by negligence or a substantial understatement.13Office of the Law Revision Counsel. 26 U.S. Code 6662 – Imposition of Accuracy-Related Penalty on Underpayments Failing to keep adequate records counts as negligence under this rule. For individuals, an understatement is “substantial” when it exceeds the greater of $5,000 or 10% of the tax you should have reported.
In practice, claiming $200 a month in phone expenses with no documentation can cost you the deduction plus 20% of the resulting shortfall. Intentional fraud, like deducting a fully personal phone plan as a business expense, can push the penalty to 75% of the underpayment. Accurate recordkeeping and an honest business-use percentage are the protection.