Can You Deduct Your Phone Bill as a Business Expense?

I used to claim 40% of my $85/month personal phone plan as a business deduction. I picked 40% because it felt right. Not because I'd actually tracked anything — just because I used my phone for DoorDash deliveries, client calls, and checking business email, and 40% seemed like a reasonable guess.

It was a guess. And if the IRS had asked me to justify it, I would have had nothing except "it felt about right." That's not a deduction strategy. That's a hope strategy.

Then I got a $10/month Lyca Mobile line dedicated to business, and the whole problem disappeared. I deduct the entire $120/year. No percentage calculations, no usage tracking, no defensibility questions. It's a business phone, used for business, and 100% of its cost is a business expense.

But before I explain why that's the better approach for most side hustlers, let me walk through the actual rules — because they matter, and they're not as straightforward as "just deduct your phone bill."

The Short Answer (and the Catch)

Yes, you can deduct phone expenses as a business expense on Schedule C. The IRS explicitly allows it. But — and this is the part people gloss over — you can only deduct the portion that's actually used for business. If you have one phone that handles both your personal life and your side hustle, you're looking at a partial deduction based on your business-use percentage.

This is the same principle that applies to home office deductions and mileage deductions. Mixed-use assets get partial deductions. Business-only assets get full deductions. The math is simple. The honest calculation of "what percentage is business" is where people stumble.

Deducting a Shared Personal/Business Phone

If you use your personal phone for business — and most side hustlers do, at least when starting out — you need to determine what percentage of your phone usage is business-related. That percentage applies to your entire phone bill: the monthly plan, any add-ons, and potentially the phone purchase itself.

So if your phone bill is $85/month and your business-use percentage is 35%, your monthly deduction is $29.75. Over a year, that's $357 on your Schedule C. Not life-changing, but not nothing — especially when combined with your other side hustle deductions.

The problem is arriving at that 35% number. The IRS doesn't prescribe a specific formula, but they do expect it to be based on actual usage — not vibes.

How to Calculate Your Business Percentage Honestly

There are a few approaches, and none of them are perfect. The goal is "reasonable and defensible," not "scientifically precise."

The time-based method. Pick a typical week. Track how many minutes you spend on business calls versus personal calls. Do the same for data-heavy activities — GPS navigation for deliveries, business email, client messaging. Divide business time by total time. This is the most commonly cited approach and it works, but it requires you to actually track for a representative period. One week is usually enough if it's a normal week.

The call-log method. Pull your call history for a month. Count business calls and personal calls. The ratio gives you a starting point. This is easier to document but misses data usage, which for gig workers is often the bigger portion of the bill.

Most side hustlers I've talked to land somewhere between 25% and 50%. If you're a DoorDash driver using your phone for GPS 4-5 hours a day, your percentage is probably higher. If you use your phone for occasional client emails and nothing else, it's probably lower. The key is that whatever number you claim, you can explain how you got there.

The Simpler Path: A Dedicated Business Line

After two years of estimating percentages and worrying about whether my 40% guess would hold up, I did something that solved the entire problem: I got a separate phone line for business.

I ordered a Lyca Mobile SIM card — $10/month for a prepaid plan on T-Mobile's network. I popped it into an old phone that was sitting in a drawer. That phone became my business phone. All client calls, all DoorDash activity, all business-related communication goes through that number.

The entire $10/month is deductible. No percentage calculation. No tracking. No defensibility questions. It's a business-only phone line, so 100% of its cost is a business expense. Period.

If you're picking a plan, the Lyca plans breakdown walks through the $5, $10, $19, and $23 tiers and which one fits which use case — the $5 line is the cheapest 100%-deductible option I've found.

Here's the part that surprised me: the dedicated line actually saves me more money than my old percentage deduction did. At 40% of $85/month, I was deducting $34/month — but I was paying $85 out of pocket. Now I pay $10/month for a line that's 100% deductible. My total phone-related business deduction dropped from $408/year to $120/year, but my actual out-of-pocket cost for business phone service dropped from $85/month (partially deductible) to $10/month (fully deductible). The net savings depend on your tax bracket, but the simplicity alone is worth it.

The other benefit I didn't expect: I actually answer my business phone during business hours and let it go to voicemail after 6 PM. That boundary between business and personal calls didn't exist when everything was on one phone. My wife noticed the difference before I did.

Deducting the Phone Itself

The phone hardware — the device itself — follows the same business-use percentage rules as the monthly plan. If you buy a $900 iPhone and use it 35% for business, $315 is deductible.

For phones costing under $2,500, most people use the Section 179 deduction to write off the business portion in the year they buy it. You don't have to depreciate it over multiple years unless you want to. For a $900 phone at 35% business use, that's a $315 deduction in year one.

If the phone is used exclusively for business — like that old phone I repurposed for my Lyca Mobile SIM — the full purchase price is deductible. In my case that phone was already paid off, so there was nothing to deduct. But if you buy a new device specifically as a business phone, the entire cost qualifies.

One thing to be careful about: if you're on a phone payment plan through your carrier (paying off a $1,200 phone over 36 months), you deduct the business-use portion of each monthly payment. You don't get to deduct the full retail price upfront.

Phone Deductions for Gig Workers

Gig workers — DoorDash, Uber, Instacart, TaskRabbit — typically have a strong case for a high business-use percentage because the phone is integral to how the work gets done. You can't accept deliveries without the app. You can't find customer addresses without GPS. You can't communicate with support without the phone.

But "I need my phone for work" doesn't make the entire bill deductible. Scrolling Instagram between deliveries is personal use. Calling your mom on the way home is personal use. The business-use percentage should reflect the time spent actively working, not just the time the phone was in your pocket.

For a driver doing 25-30 hours per week on gig apps, a business-use percentage of 40-55% is probably reasonable. If you're full-time at 50+ hours, it could be higher. The data usage argument is stronger for gig workers than for other side hustlers because GPS and app data are measurably business-related.

The dedicated-line approach works for gig workers too, though with a caveat: you'll want a plan with enough data to run delivery apps and GPS. The $10/month Lyca Mobile plan works for calls and light data, but if you're driving for DoorDash full-time, you might need a plan with more data — maybe $20-25/month. Still cheaper and cleaner than calculating a percentage of your premium personal plan.

What Records to Keep

For a shared phone with a business-use percentage:

• Monthly phone bills (PDF statements from your carrier)
• Your calculation of the business-use percentage, including how you arrived at it
• Any call logs or usage data you used to determine the percentage
• If you bought a new phone, the receipt showing the purchase price

For a dedicated business phone, recordkeeping is simpler. You just need the monthly bills and the purchase receipt for the phone. That's it. The bill is 100% deductible, so there's no percentage to justify.

Keep these records for at least three years from the date you file the return claiming the deduction. I keep mine for five years because I'm slightly paranoid after my first encounter with IRS penalties, but three years is the standard statute of limitations for most audits.

If you're still using your personal phone for business, take a week and actually track the usage. Get a real number. Or do what I did — grab a cheap prepaid SIM, dedicate it to business, and stop thinking about it. Either way, the deduction is real. The question is if you're claiming it in a way you can defend.

Related reading: Every tax deduction side hustlers can claim and the best cheap phone plans for side hustlers.

Bruce Samuels

Personal Finance Writer

Bruce is a full-time freelancer based in DeSoto, Texas, who spent two years overcalculating his phone deduction before switching to a $10/month dedicated business line. He is not a CPA — just a guy who got tired of guessing at percentages.