Cell Phone & Internet Tax Deductions for Self-Employed (2026)
If you freelance from a phone and a Wi-Fi connection, both bills are partially deductible. The catch — and it's a real one — is that the IRS does not let you write off the full amount unless you can show the line is used 100% for business. Almost nobody can. The fix is simple: estimate a defensible business-use percentage, document how you got there, and deduct that share.
Below is exactly how to do that, plus the cleaner alternative (a separate business line) and the line-by-line treatment on Schedule C.
The business-use percentage rule
Cell phones and home internet are what the IRS calls "mixed-use" expenses. You use them for work and for personal life on the same line. The deduction is the business share of the bill, full stop:
Deduction = monthly bill × business-use %
So if your phone bill is $80/month and you can show 70% business use, you deduct $56/month — $672 for the year. Same math for internet. It's the percentage that decides everything, and that's the part the IRS will challenge if it ever looks.
Two notes that trip people up:
- There is no fixed safe-harbor percentage. The IRS used to list cell phones as "listed property" with strict logging rules, but the Small Business Jobs Act of 2010 removed that. The standard now is a "reasonable" estimate that you can defend.
- "Reasonable" is not a free pass. 100% on a phone you also text family from is not reasonable. 90% on a line where the only personal use is the occasional Uber receipt — much easier to defend.
How to determine your % defensibly
You don't need a 365-day call log. You do need a method, written down once, that any auditor would call sensible. Three approaches that hold up:
1. Two-week sample log
Pick two normal weeks (not vacation, not a launch sprint). For 14 days, jot down which calls, texts, and data sessions were business vs personal. A simple tally on your phone's notes app is fine. At the end, compute the ratio and apply it for the year.
Example: 142 business calls + 61 personal = 70% business. Write "Cell phone business-use sample, March 3-16, 2026: 70%" in a file you keep. Done.
2. App- or carrier-data approach
Most carriers can break out usage by number. If 80% of your minutes go to client numbers and your most-used apps are Slack, Gmail, Zoom, and a CRM — that's a defensible story. Screenshot the dashboard once a quarter.
3. Hours-based estimate
If you work 50 hours a week and are awake 112 hours, your phone is "available for business" roughly 45% of waking hours. That's a floor — most freelancers actually use it more than that during work blocks, so 50-65% lands within reason. This works best if call/data logs aren't easy to pull.
Whatever method you pick, write a one-line memo with the date and the number. That single sentence is the difference between "the IRS adjusted my deduction" and "the IRS accepted my deduction."
Internet — same rule, looser numbers
Home internet is harder to log call-by-call because it's always on. Most self-employed filers land somewhere between 40% and 80% business use. A few sanity checks:
| Your situation | Reasonable internet % |
|---|---|
| Solo freelancer working from home full-time, household of 1 | 70-90% |
| Freelancer + spouse who also WFH, no kids | 40-55% |
| Freelancer with two kids streaming after school | 25-40% |
| Side hustle 10 hours/week, full-time job elsewhere | 10-20% |
If you also claim the home office deduction using the simplified method ($5/sqft, capped at $1,500), you can still deduct the business share of internet on top — they're separate write-offs. If you use the regular (actual-expense) home office method, internet is usually folded into utilities and pro-rated by your office's square footage instead.
The cleaner alternative — a separate business line
If you want to skip the percentage math entirely, get a second cell line or a dedicated business hotspot. The IRS treats fully separate business lines as 100% deductible, no log required.
What "separate" means in practice:
- A second SIM/eSIM on your phone, billed separately and used only for client calls.
- A Google Voice or RingCentral business number paid through your business account.
- A standalone hotspot device you only use during work blocks.
Cost is usually $10-30/month. For most freelancers earning $40k+, the time saved on logging — and the cleaner audit story — is worth it. Same logic applies to internet: a small business plan from your ISP, or a separate cellular hotspot for work, is fully deductible.
Where it goes on Schedule C
This is where filers most often slip up. There are two plausible lines and the IRS doesn't really care which, as long as you pick one and stick with it.
| Schedule C line | What goes here |
|---|---|
| Line 25 — Utilities | Internet, cell phone, electricity, gas, water (business share) |
| Line 18 — Office expense | Office supplies, postage, small software. Some preparers also park phone/internet here. |
| Line 27a — Other expenses | Catch-all if you want a clearly labeled line like "Cell phone (business %)" |
Most accountants put cell phone and internet on Line 25 because the IRS instructions specifically list "telephone" and "internet" as utilities. If you prefer Line 27a so the deduction is itemized by name, that's also fine — just don't double-claim it on both.
Once you have the annual number, plug it into the Quarterly1099 calculator alongside your other business expenses to see how much it actually shaves off your quarterly estimated payments.
What records the IRS wants if audited
The technical standard is "ordinary, necessary, and substantiated." For phone and internet, that translates to four things in a folder:
- Twelve monthly bills (or annual statements). PDFs from your carrier portal are fine.
- Your written percentage estimate with the date and method ("Two-week sample, March 3-16, 2026: 142/203 = 70%").
- Evidence the line is used for business at all — e.g., a client list, the phone number on your invoices, the email signature that includes the number.
- Consistency across years. If you claimed 70% in 2025 and 95% in 2026 with no business change, expect a question.
You don't have to send any of this with your return. You just have to be able to produce it within 30 days if a notice arrives. Save it to a "Tax docs / 2026" folder when you compute the number, not in April 2027 when you're trying to remember.
Common mistakes
- Claiming 100% on a personal line. The single fastest way to lose the deduction in an audit. If you use the line for any non-business call, 100% is wrong.
- Deducting the full bill and the equipment together at full value. The phone hardware is a separate purchase — also subject to business-use % unless you have a dedicated business device. Same for routers and modems.
- Forgetting the deduction entirely. Many first-year freelancers miss this one. Even at $50/month and 60% business use, that's $360/year. See the full freelancer deductions checklist for the rest.
- Stacking it with the actual-expense home office. If you're using the actual-expense (Form 8829) method, utilities including internet are pro-rated there. Don't also deduct internet under Line 25 — that's the same expense twice.
- Switching methods every year without a reason. Pick a percentage method, document it, and reuse the same method annually. Year-over-year inconsistency is the #1 audit flag for this category.
Quick example: $80 phone + $90 internet
Solo freelancer, single household, works from home 40 hours a week.
- Phone: $80/mo × 70% = $56/mo → $672/year
- Internet: $90/mo × 65% = $58.50/mo → $702/year
- Total Schedule C deduction: $1,374
At a 22% federal bracket plus 15.3% self-employment tax, that $1,374 saves about $511 in actual tax. Not huge, but it's the difference between a quarterly check that hurts and one that doesn't. (See Schedule C basics if you're filing for the first time.)
FAQs
Can I deduct my phone if my employer also reimburses some of it? Only the unreimbursed business portion. If your W-2 employer covers half and you also freelance using the same phone, you can deduct the freelance share of what's left over.
What if I bought a new iPhone this year — can I deduct that? Yes, the business-use percentage of the cost. Under Section 179 you can usually expense the full business share in year one rather than depreciating it. Keep the receipt.
Is a separate business line really worth $20/month for the cleaner write-off? If you're earning $30k+ in self-employment income, almost always yes. You save on the logging, the audit risk, and you can deduct 100% of the line plus 100% of the device.
Does my home internet need to be in my business name? No. The IRS cares whether the expense was actually used for business, not whose name is on the bill. Personal-name internet at your home is fine.
What percentage does the IRS expect to see? There's no official number. Anything between 30-80% is rarely questioned for full-time freelancers. Above 90%, expect to defend it.