Guide for Self-Employed Professionals
What Schedule C Category for Your Phone Bill? (2026)
Short answer: it depends on whether you have a dedicated business line or use one phone for everything. Here's exactly where to put it, how to calculate your deduction, and what the IRS expects.
Key Takeaways
- A dedicated business phone line goes on Schedule C Line 25 (Utilities) at 100%. A shared personal/business phone goes on Line 27a (Other Expenses) at your business-use percentage.
- The phone device itself is a separate deduction from the monthly service bill and can qualify for Section 179 if business use exceeds 50%.
- The IRS is unlikely to question a 50 to 70% business-use claim from a sole proprietor, but claiming 95% on a phone you also use personally is not defensible.
- Phone accessories (cases, car mounts, chargers, Bluetooth headsets) and phone insurance are also deductible at the same business-use percentage.
The Quick Answer
There are two places your phone bill can go on Schedule C, and the right one depends on your situation:
Line 25: Utilities
Use this if you have a dedicated business phone line that you use exclusively for work. A second cell phone plan, a business-only landline, or a separate VoIP number with its own monthly bill all qualify.
Line 27a: Other Expenses
Use this if you use one phone for both personal and business purposes. You'll deduct only the business-use percentage of your bill, and you'll write “Cell phone (business %)” as the description in Part V of your Schedule C.
Most self-employed people use one phone for everything, which means most people will use Line 27a. That's completely normal, and the IRS is fine with it as long as you only deduct the business portion.
Why the Line Matters
You might be wondering: does the IRS really care which line number I use? In practical terms, both Line 25 and Line 27a reduce your taxable income the same way. The amount of your deduction doesn't change based on which line you pick.
But using the right line does two things. First, it keeps your return clean and consistent with what the IRS expects. If they see a $1,200 utility deduction, they expect it to be a dedicated business line, not 60% of your personal cell plan. Second, it makes your life easier if you're ever asked to explain the deduction. The category tells the story.
Think of it this way: Line 25 says “I have a business phone line.” Line 27a says “I use my personal phone for work and I'm deducting the business portion.” Both are legitimate. Just pick the one that matches your situation.
How to Calculate Your Business-Use Percentage
If you use one phone for everything (and most people do), you need to figure out what percentage of your usage is for business. The IRS doesn't prescribe a single method, but here are the most common approaches:
Time-based estimate.
Track your phone use for a typical week or two. If you spend roughly three hours a day on work calls, emails, and business apps, and about two hours on personal use, your business percentage is around 60%. This is the most common method for sole proprietors.
Call log review.
Pull your itemized phone bill for a representative month. Count the minutes spent on business calls versus personal calls. If 200 of your 500 total minutes were client calls, that's 40%. This method works well if most of your phone use is actual voice calls.
App-based tracking.
Both iPhone and Android have built-in screen time tracking. Look at how much time you spend in business apps (email, Slack, invoicing, navigation for job sites) versus personal apps (social media, games, streaming). This gives you a data-backed percentage.
Example Calculation
Let's say your Verizon plan costs $85 per month. You track your usage for two weeks and estimate 65% is business-related.
- •Monthly bill: $85.00
- •Business use: 65%
- •Monthly deduction: $85.00 x 0.65 = $55.25
- •Annual deduction: $55.25 x 12 = $663.00
You'd enter $663 on Line 27a with the description “Cell phone (65% business use)” in Part V.
Whatever method you choose, be consistent and reasonable. The IRS is unlikely to question a 50-70% business-use claim from a sole proprietor who clearly uses their phone for work. Claiming 95% when you also have kids, a social life, and a Netflix account on your phone? That might raise eyebrows.
What If You Have a Dedicated Business Line?
If you carry a second phone exclusively for work, or you pay for a separate phone plan that's only used for business, the deduction is simpler. You can deduct 100% of that line's cost and report it on Line 25 (Utilities).
This includes:
- •A second cell phone plan used only for client calls and business communications
- •A business VoIP line (Google Voice paid plan, Grasshopper, RingCentral)
- •A landline installed at your office or workspace that's used solely for business
One important IRS rule to know: you cannot deduct the base cost of the first landline phone in your home, even if you use it for business calls. This rule is specific to landlines in a home office. However, you can deduct the cost of a second dedicated business line in your home, and you can deduct business-related long-distance charges on any line.
A similar partial-deduction approach applies to your internet bill. This landline rule does not apply to cell phones. Cell phones are treated as regular business property, so the business-use percentage deduction applies as described above.
Phone Purchase vs. Monthly Service Bill
Your monthly phone plan and the phone itself are two separate deductions, and they go in different places on your return.
Monthly service bill
This is your recurring plan cost from Verizon, AT&T, T-Mobile, or any carrier. Deduct the business-use percentage on Line 27a (or 100% on Line 25 for a dedicated business line). This is straightforward and works the same every month.
Phone purchase (the device itself)
If you bought a new phone and use it more than 50% for business, you can deduct the business-use percentage of the purchase price. You have two options: take a Section 179 deduction to write off the full business portion in the year you bought it, or depreciate it over five years. Most self-employed people choose Section 179 because it's simpler. This gets reported on Line 13 (Depreciation) and requires Form 4562.
Example: Buying a New Phone
You buy a new iPhone for $999 and use it 70% for business.
- •Phone cost: $999.00
- •Business use: 70%
- •Section 179 deduction: $999 x 0.70 = $699.30
If business use is 50% or less, Section 179 is not available. You would need to depreciate the phone over five years using MACRS instead.
Many carriers let you pay for the phone in monthly installments bundled with your plan. If your bill includes a device payment (like “$27.77/mo for 36 months”), separate the device cost from the service cost. The service portion goes on Line 27a as described above. The device portion is a capital expense that gets the Section 179 or depreciation treatment.
What This Looks Like With Real Numbers
Let's walk through some realistic scenarios so you can see how this works in practice.
Scenario 1: Freelance graphic designer, one phone
Sarah pays $65/month for her T-Mobile plan. She uses her phone to communicate with clients, check email, manage invoices, and navigate to meetings. She estimates 60% business use.
- •Annual phone bill: $65 x 12 = $780
- •Business deduction: $780 x 0.60 = $468
- •Where it goes: Line 27a, labeled “Cell phone (60% business)”
Scenario 2: Rideshare driver with a second phone
Marcus drives for Uber and Lyft full-time. He keeps his personal phone on an AT&T plan ($50.99/month) and has a second phone on a prepaid plan ($35/month) that he uses only for the driver apps, navigation, and passenger communication.
- •Business phone annual cost: $35 x 12 = $420
- •Deduction: $420 (100%, dedicated business line)
- •Where it goes: Line 25 (Utilities)
Scenario 3: Photographer with phone and accessories
Elena is a freelance photographer. She pays $85/month for her Verizon plan and bought a new phone for $1,099 to use for client previews, social media marketing, and scheduling. She estimates 75% business use.
- •Monthly service deduction: $85 x 0.75 = $63.75
- •Annual service deduction: $63.75 x 12 = $765 (Line 27a)
- •Phone purchase (Section 179): $1,099 x 0.75 = $824.25 (Line 13)
- •Total first-year deduction: $1,589.25
Common Mistakes to Avoid
Deducting 100% of a shared phone bill.
This is the most common error. If you use one phone for personal and business, you cannot deduct the entire bill. The IRS requires you to allocate based on actual business use. Claiming 100% of a phone you also use to text friends, scroll social media, and stream music is not defensible.
Not keeping any records of business use.
You don't need to log every call, but you do need a reasonable basis for your percentage. If the IRS asks how you arrived at 60%, “I guessed” is not a great answer. A two-week time log, a screen time summary, or an itemized bill with business calls highlighted gives you something to point to.
Forgetting about the phone purchase deduction.
People remember to deduct the monthly bill but forget that the phone itself is also deductible. If you bought or financed a phone this year and use it for business, that cost is a separate deduction.
Putting a shared phone on Line 25.
Line 25 is for utilities, and the IRS expects items there to be dedicated business expenses. If you deduct 60% of your personal phone on Line 25, it looks like you're claiming a utility you don't have. Use Line 27a for partial deductions and keep things clean.
Double-counting family plan costs.
If you're on a family plan that costs $180/month for four lines, you can only deduct the business portion of your line, not the full family plan. Divide the cost proportionally first, then apply your business-use percentage to your share.
Phone-Related Expenses People Miss
Your monthly bill isn't the only phone expense you can deduct. If any of these are used for business, apply the same business-use percentage:
- •Phone cases and screen protectors. That $49 OtterBox you bought to protect your work phone counts.
- •Car mounts and chargers. Especially relevant for rideshare drivers, delivery couriers, and anyone who uses their phone for navigation on the job.
- •Business apps and subscriptions. If you pay for apps you use exclusively for work (invoicing, project management, scheduling), those are 100% deductible. Apps you use for both personal and business get the same percentage split.
- •Phone insurance or extended warranty. If you pay for AppleCare+ or carrier insurance, the business portion is deductible.
- •Bluetooth headsets and earbuds. That $79 pair of earbuds you use for client calls is a business expense.
These smaller items typically go on Line 27a (Other Expenses) or Line 22 (Supplies), depending on cost and how you categorize them. The key is to apply the business-use percentage consistently.
What Records to Keep
The IRS can ask you to substantiate any deduction, and phone expenses are no exception. Here's what to have on hand:
Monthly phone bills or statements.
Save your carrier bills (PDF downloads from your account work fine). These show the amount you paid each month, which is the starting point for your deduction.
Your business-use percentage and how you calculated it.
Keep a note explaining your method. Something like “Based on two-week time tracking in March 2025, business use was 62%. Rounded to 60% for conservative estimate.” That's all you need.
Receipts for phone purchases and accessories.
If you bought a phone, a case, or earbuds and are deducting the business portion, keep the purchase receipt. Digital receipts from Apple, Best Buy, or Amazon work fine.
A brief log of business use (recommended, not required).
The IRS doesn't require a daily call log, but having a one-week sample of your usage pattern makes your percentage much more defensible. Screen time data from your phone's settings is an easy way to document this.
The Bottom Line
Your phone bill is a legitimate business deduction. If you have a dedicated business line, put 100% on Line 25. If you use one phone for everything (like most people), calculate your business-use percentage and put that amount on Line 27a (the same approach works for your home office deduction). Don't forget that the phone itself, accessories, and business apps are separate deductions too.
The key is keeping a reasonable, documented business-use percentage. You don't need to track every minute, but you do need to be able to explain your number if asked.
When you upload your bank or credit card statement to Categorize My Expenses, charges from Verizon, AT&T, T-Mobile, and other carriers get sorted into the right Schedule C category automatically. It handles the categorization so you can focus on the business-use percentage.
Disclaimer: This article is for educational purposes only and does not constitute tax, legal, or financial advice. Tax rules change, and individual situations vary. Consult a qualified tax professional for advice specific to your situation. Categorize My Expenses is a financial data organization tool. It is not a tax preparer and does not provide tax advice.
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