Business expense & tax deduction questions

Any ordinary and necessary expense you incur while running your business is deductible on Schedule C.

The IRS defines a deductible business expense as one that is both “ordinary” (common in your industry) and “necessary” (helpful and appropriate for your business). Common Schedule C deductions include advertising, vehicle expenses, home office, internet and phone, software subscriptions, professional services, travel, education, and supplies.

Example: A consultant who pays $150/month for project management software, $80/month for a business phone line, and $200/year for professional association dues can deduct all three — they’re ordinary and necessary to run the business.

Related: The Complete Guide to Schedule C Categories →

Yes — if you use part of your home regularly and exclusively for business.

The home office deduction requires that the space be used regularly and exclusively for business. It can’t be a guest room that doubles as an office. You can calculate the deduction two ways: the simplified method ($5 per square foot, up to 300 sq ft) or the regular method (actual expenses × percentage of home used for business).

Example: A freelance designer uses a dedicated 200 sq ft office in their 2,000 sq ft home. That’s 10% of the home. Using the regular method, 10% of rent, utilities, and internet are deductible. Using the simplified method: 200 sq ft × $5 = $1,000 deduction.

Related: Home Office Deduction Calculator →

Yes, but only the business-use portion.

If you use your cell phone for both personal and business purposes, you can only deduct the percentage used for business. Keep records of your business use. If you have a dedicated business phone line, 100% is deductible.

Example: You use your phone 60% for business (client calls, emails, apps). Your monthly bill is $80. You can deduct $48/month ($80 × 60%) = $576/year.

Meals are 50% deductible when business is discussed. Entertainment is generally not deductible.

The Tax Cuts and Jobs Act of 2017 eliminated most entertainment deductions. However, meals with clients, prospects, or business associates where business is discussed are still 50% deductible. Keep records of who attended and what business was discussed.

Example: You take a client to lunch to discuss a new project. The bill is $120. You can deduct $60 (50%). A sporting event with the same client? Not deductible.

A business expense directly relates to earning income. A personal expense benefits you personally, regardless of your business.

The line can be blurry, but the IRS looks at whether the expense was incurred primarily for business purposes. Mixed-use expenses (like a car used for both business and personal driving) must be split proportionally.

Example: A laptop used entirely for client work = 100% business. The same laptop used equally for Netflix and client work = 50% business. A vacation that includes one business meeting = mostly personal, only the meeting costs are deductible.

Software subscriptions used for business go on Schedule C under "Other expenses" or sometimes "Office expense" depending on use.

The IRS doesn’t have a specific line for software — most business owners report it under “Other expenses” with a description. If the software is used to run your office (word processing, email), “Office expense” also works. The key is consistency year over year.

Example: Adobe Creative Cloud for a designer = Other expenses (Tools of the trade). QuickBooks for bookkeeping = Other expenses (Accounting software). Zoom for client meetings = Other expenses (Communication).

Related: Schedule C Category Explainer →

Yes — either by tracking actual miles driven for business or using the IRS standard mileage rate.

Two methods: (1) Standard mileage rate — multiply business miles by the IRS rate (72.5 cents/mile in 2026, per IRS Notice 2026-10). Simple, no need to track gas and repairs. (2) Actual expense method — track all car expenses and multiply by the percentage of business use. Better if you drive an expensive car or have high costs.

Example: You drive 8,000 miles for business in 2026. Standard mileage deduction: 8,000 × $0.725 = $5,800. No receipts for gas needed — just a mileage log.

Related: Mileage Deduction Calculator →

You can only deduct the business portion. Mixed expenses need to be split proportionally.

Mixed-use expenses are common and totally legal — you just need to calculate the business percentage honestly. The IRS can disallow deductions that appear inflated, so keep records that justify your allocation.

Example: Your home internet costs $100/month. You work from home full-time and estimate 70% business use. Deductible: $70/month = $840/year. Keep a note in your records explaining how you calculated the 70%.

Keep receipts and records for at least 3 years from the date you file your return, or 3 years from the due date — whichever is later.

The IRS generally has 3 years to audit your return. However, if you underreported income by more than 25%, the window extends to 6 years. For property you own (like rental real estate), keep records until you sell it plus 3 years. When in doubt, 7 years is a safe rule of thumb.

Example: You file your 2024 return on April 15, 2025. Keep all 2024 records until at least April 15, 2028. If you bought equipment in 2024 that you’re depreciating over 5 years, keep those records until 2032.

The IRS standard mileage rate for business driving is 72.5 cents per mile for 2026, per IRS Notice 2026-10.

The IRS adjusts this rate periodically based on fuel costs and vehicle operating expenses. You multiply your total business miles by the rate to get your deduction. You must choose between the standard mileage rate and the actual expense method — and generally you must choose the standard mileage rate in the first year you use the vehicle for business.

Example: 10,000 business miles in 2026 × $0.725 = $7,250 deduction. Keep a mileage log with date, destination, business purpose, and miles for each trip.

Related: Mileage Deduction Calculator →

Real estate investors can deduct mortgage interest, property taxes, insurance, repairs, management fees, depreciation, utilities, and advertising on Schedule E.

Rental property expenses fall on Schedule E (not Schedule C). The major categories include: mortgage interest, property taxes, insurance premiums, repairs and maintenance, property management fees, depreciation (over 27.5 years for residential), utilities you pay, advertising for tenants, and professional services (accountant, attorney).

Example: A single-family rental property generates $18,000/year in rent. Deductible expenses: $8,400 mortgage interest + $2,400 property taxes + $1,800 insurance + $1,200 repairs + $1,800 management fees + $4,500 depreciation = $20,100 in deductions. Taxable income: $0 (with a $2,100 loss that may offset other income).

Related: Real Estate Investor Expense Guide →

Repairs are fully deductible in the year you pay them. Improvements must be depreciated over time.

The distinction matters: a repair restores the property to its original condition (fix a broken window, patch a roof leak, repaint). An improvement adds value or extends the property’s life (new roof, addition, kitchen remodel). Repairs = deduct now. Improvements = capitalize and depreciate.

Example: You spend $800 fixing a broken HVAC unit = repair, deduct in full this year. You spend $12,000 replacing the entire HVAC system = improvement, depreciate over 27.5 years (~$436/year).

Depreciation lets you deduct the cost of your rental property over 27.5 years, even though you're not spending money each year.

The IRS allows you to deduct the wear and tear on rental property through depreciation. For residential rentals, you divide the cost of the building (not the land) by 27.5 to get your annual depreciation deduction. It’s a non-cash deduction — you don’t spend money, but you still get the tax benefit.

Example: You buy a rental property for $300,000. The land is worth $50,000, so the building basis is $250,000. Annual depreciation: $250,000 ÷ 27.5 = $9,090/year. Over 27.5 years, you deduct the full $250,000 building cost.

Yes — property management fees paid to a third party are fully deductible on Schedule E.

If you hire a property management company to handle tenant relations, maintenance coordination, and rent collection, their fees are a deductible rental expense. Typically 8–12% of monthly rent, these fees are ordinary and necessary for running a rental business.

Example: Your rental generates $2,000/month. Your property manager charges 10% = $200/month = $2,400/year fully deductible on Schedule E.

Schedule E is for passive rental income. Schedule C is for real estate professionals or those running a lodging business (like Airbnb with substantial services).

Most rental property income goes on Schedule E as passive income. Schedule C applies if you’re a real estate professional (750+ hours in real estate per year, more than half your working time), or if you provide substantial services to tenants like daily cleaning, meals, or concierge (think hotel-like operations). Airbnb rentals may be Schedule C if you provide significant services.

Example: You own two long-term rental properties and spend 200 hours/year managing them → Schedule E. You operate a short-term rental with daily cleaning, breakfast, and concierge services → likely Schedule C.

Yes — 100% of mortgage interest on a rental property is deductible on Schedule E.

Unlike your primary residence (where the mortgage interest deduction is limited and requires itemizing), rental property mortgage interest is fully deductible as a business expense on Schedule E. This includes interest on loans used to improve the property.

Example: You pay $14,400 in mortgage interest on a rental property in 2024. All $14,400 is deductible on Schedule E, directly reducing your taxable rental income.

Travel to your rental property for management, maintenance, or inspection is deductible.

You can deduct transportation costs (mileage at the standard rate or actual costs), lodging if you need to stay overnight, and 50% of meals. The trip must be primarily for business — if you combine a vacation with a property visit, only the business portion is deductible.

Example: You drive 40 miles round-trip to inspect your rental property = 40 × $0.725 = $29 deductible. You fly to another city to check on an out-of-state rental, spend 3 days managing issues = airfare + hotel fully deductible, meals 50% deductible.

Yes — MLS fees, marketing costs, and most business expenses are deductible on Schedule C for real estate agents.

Real estate agents are typically self-employed and file Schedule C. MLS fees, lockbox fees, signage, photography, staging costs, advertising (Zillow, social media, print), business cards, and open house expenses are all deductible as ordinary business expenses.

Example: Annual MLS dues: $1,200. Zillow Premier Agent: $3,600. Professional photography per listing (10 listings): $2,500. Business cards and marketing materials: $400. Total deductible marketing: $7,700.

A deduction reduces your taxable income. A credit reduces your actual tax bill dollar-for-dollar. Credits are more valuable.

A $1,000 deduction saves you money based on your tax rate — if you’re in the 22% bracket, it saves $220. A $1,000 tax credit saves you $1,000 directly off your tax bill regardless of your bracket.

Example: You have $50,000 in self-employment income. A $5,000 business expense deduction reduces your taxable income to $45,000. If you’re in the 22% bracket, you save $1,100 in taxes. A $1,100 child tax credit saves you $1,100 directly — same result, but credits are rarer and harder to qualify for.

Yes — if you expect to owe $1,000 or more in taxes for the year, you're required to make quarterly estimated payments.

Unlike employees who have taxes withheld from each paycheck, self-employed people pay taxes in four installments throughout the year. Missing or underpaying quarterly estimates results in a penalty, even if you pay in full by April 15.

2024 quarterly due dates:

• Q1 (Jan–Mar): April 15, 2024
• Q2 (Apr–May): June 17, 2024
• Q3 (Jun–Aug): September 16, 2024
• Q4 (Sep–Dec): January 15, 2025

Example: You’re a consultant expecting $60,000 in net self-employment income. Estimated tax owed: ~$18,000 (income tax + self-employment tax). Quarterly payment: ~$4,500 due each quarter.

Related: Quarterly Tax Calculator →