How to Write Off Business Expenses (Complete Guide for 2026)

You're paying too much in taxes.

Not because you're bad at taxes—but because you're not writing off everything you can.

Every dollar you spend on your business can reduce your taxable income. But most freelancers and small business owners miss deductions because they don't know what's deductible or how to track it.

This guide explains how to write off business expenses legally, what qualifies, and strategies to maximize tax savings.

What Does "Write Off" Mean?

Write off = deduct from taxable income.

When you "write off" a business expense, you subtract it from your gross income, which reduces your taxable profit.

Example:

• Gross income: $80,000
• Business expenses: $20,000
• Taxable income: $60,000 (you pay taxes on this, not $80K)

Tax savings:

• Income tax saved: ~$4,400 (22% bracket)
• Self-employment tax saved: ~$2,826 (15.3% on deduction)
• Total savings: ~$7,226

Bottom line: $20K in write-offs = $7K+ in tax savings.

What Business Expenses Can You Write Off?

The IRS allows deductions for ordinary and necessary business expenses:

• Ordinary: Common in your industry
• Necessary: Helpful and appropriate for your business

✅ Fully Deductible (100%):

• Office supplies (pens, paper, printer ink)
• Software subscriptions (Adobe, Slack, CentSense)
• Advertising and marketing (ads, business cards, website)
• Business insurance (liability, E&O, property)
• Legal and accounting fees
• Office equipment (computers, desks, chairs)
• Office rent (if separate from home)
• Utilities (business location)
• Bank fees and credit card processing fees
• Contract labor (freelancers, VAs)
• Professional memberships
• Education and training (courses, workshops)

⚠️ Partially Deductible:

• Business meals: 50% deductible (client meetings, conferences)
• Vehicle expenses: Deductible based on business-use percentage
• Home office: Deductible if exclusive/regular use

❌ NOT Deductible:

• Personal expenses (groceries, personal meals, personal clothing)
• Commuting from home to primary office (if separate location)
• Fines and penalties
• Political contributions
• Entertainment (concerts, sporting events)—no longer deductible post-2017 tax reform

How to Write Off Business Expenses (Step-by-Step)

Step 1: Track Every Business Purchase

Save receipts for ALL business expenses (not just over $75, though IRS requires receipts for $75+).

How to track:

• Receipt scanner app: CentSense (AI auto-categorizes to Schedule C lines), Expensify
• Spreadsheet: Manual entry (free but time-consuming)
• Accounting software: QuickBooks, FreshBooks, Wave

Best practice: Scan receipts immediately (don't let them pile up).

Step 2: Categorize Expenses by Tax Category

Use Schedule C categories (IRS form for sole proprietors) to organize expenses:

• Line 8: Advertising
• Line 9: Car and truck expenses
• Line 10: Commissions and fees
• Line 11: Contract labor
• Line 13: Depreciation
• Line 15: Insurance
• Line 17: Legal and professional fees
• Line 18: Office expenses
• Line 22: Supplies
• Line 24a: Travel
• Line 24b: Meals (50%)
• Line 25: Utilities
• Line 27a: Other expenses

Full expense category guide →

Step 3: Keep Receipts and Documentation

The IRS requires:

• Receipts for expenses over $75 (best practice: save all)
• Mileage log (if deducting vehicle expenses)
• Business purpose (who, what, when, where, why)

How long to keep records: 3+ years (6 years for large underreporting, forever for fraud).

Step 4: Report on Your Tax Return

Sole proprietors: Schedule C (Form 1040)
S-Corps: Form 1120S
Partnerships: Form 1065
LLCs: Depends (Schedule C by default, or corporate return if elected)

Your deductions reduce:

1. Income tax (10%-37% depending on bracket)
2. Self-employment tax (15.3% for sole props, not S-Corps on distributions)

Top Business Expenses to Write Off

1. Home Office Deduction

If you use part of your home exclusively for business, you can deduct:

• Simplified method: $5/sq ft (up to 300 sq ft = $1,500 max)
• Actual method: Proportional rent, utilities, insurance, repairs

Requirements:

• Exclusive use (can't be a dual-purpose room)
• Regular use (primary place of business)

Full home office guide →

2. Vehicle Expenses / Mileage

Two methods (choose one):

• Standard mileage rate: 67¢/mile (2026)
• Actual expenses: Gas, repairs, insurance, depreciation (track ALL vehicle costs)

Deductible trips:

• Client meetings
• Errands for business supplies
• Travel to networking events, conferences

Not deductible: Commuting from home to primary office (if separate location).

Full mileage tracking guide →

3. Business Meals (50% Deductible)

Meals with clients, prospects, or business partners are 50% deductible.

Requirements:

• Business purpose (discuss work, projects, contracts)
• Document: who, when, where, business topic

Example:

• Lunch with client: $80
• Deductible: $40

NOT deductible: Personal meals, family dinners, commuting meals.

4. Travel Expenses

Business travel costs are fully deductible:

• Airfare, train tickets, car rentals
• Hotels, Airbnb
• Uber, taxis during travel
• Meals during overnight trips (50%)

Requirements:

• Trip must be primarily for business (more than 50% business days)
• Document business purpose

5. Software & Subscriptions

All business software is deductible:

• Adobe Creative Cloud, Microsoft 365
• Slack, Notion, Asana, Trello
• CentSense (expense tracking)
• Website hosting, domain names

6. Office Equipment & Electronics

Computers, monitors, tablets, cameras, printers—all deductible.

Two ways to deduct:

• Expense immediately: If under $2,500/item (de minimis safe harbor)
• Depreciate: If over $2,500, spread over 5 years (or use Section 179 to expense immediately)

7. Education & Professional Development

Courses, workshops, certifications that improve your skills are fully deductible.

Examples:

• Online courses (Udemy, Coursera, LinkedIn Learning)
• Industry conferences
• Books, research subscriptions

NOT deductible: Education for a new career (e.g., law school if you're a designer).

8. Health Insurance (Self-Employed)

If you're self-employed, you can deduct health insurance premiums for:

• You
• Your spouse
• Your dependents

Important: This deduction goes on Form 1040 Schedule 1 (not Schedule C). It reduces your AGI, lowering both income tax and self-employment tax.

9. Retirement Contributions

Self-employed retirement contributions reduce taxable income:

• SEP-IRA: Up to 25% of net profit (max $69,000 in 2026)
• Solo 401(k): Up to $23,500 employee deferral + 25% employer contribution (max $69,000)

Deduction location: Form 1040 Schedule 1 (not Schedule C).

10. Contract Labor

Payments to freelancers, contractors, and virtual assistants are fully deductible.

Requirements:

• Must issue 1099-NEC if you pay $600+ per year
• Must be true independent contractors (not employees)

How to Maximize Business Write-Offs

1. Track Every Expense (Even Small Ones)

$5 here, $10 there—it adds up. Don't skip small purchases.

Example:

• $50/month in office supplies = $600/year deduction
• Tax savings: ~$200 (depending on bracket + SE tax)

2. Use a Business Credit Card

Separate business and personal expenses. A dedicated business card makes tracking easier.

3. Document Business Purpose

For meals, travel, and entertainment, note:

• Who you met
• Business purpose
• Date and location

Example: "3/28/26 - Lunch with client Sarah Jones to discuss website redesign project - $65"

4. Don't Miss Mileage

At 67¢/mile, mileage adds up fast. Track every business trip.

Example:

• 5,000 business miles
• Deduction: $3,350

5. Review Quarterly

Don't wait until tax time. Review expenses quarterly to catch errors and estimate tax liability.

6. Maximize Home Office Deduction

If you qualify, the home office deduction can save $500-$1,500+/year.

7. Contribute to Retirement

Max out SEP-IRA or Solo 401(k) to reduce taxable income.

Common Write-Off Mistakes to Avoid

❌ Claiming Personal Expenses

Personal groceries, family dinners, personal travel—not deductible. Only business expenses qualify.

❌ Deducting 100% of Meals

Most business meals are 50% deductible. Don't claim the full amount.

❌ Forgetting to Track Mileage

At 67¢/mile, this is a huge deduction. Track every business trip.

❌ No Documentation

Receipts, mileage logs, business purpose notes—document everything.

❌ Mixing Personal and Business

Use a dedicated business bank account. Never mix.

❌ Not Maximizing Home Office

If you qualify, claim it. Many freelancers leave this money on the table.

What Happens If You Don't Write Off Expenses?

You overpay taxes.

Example:

• Gross income: $80,000
• Expenses you could have tracked: $20,000
• You didn't track them, so taxable income: $80,000
• Tax owed: ~$17,000 (income tax + SE tax)

If you HAD tracked expenses:

• Taxable income: $60,000
• Tax owed: ~$10,000
• Savings: $7,000

Bottom line: Not tracking expenses = voluntarily paying $7K+ extra in taxes.

Start Writing Off Expenses Today

The best time to start tracking expenses was January 1st. The second-best time is today.

Quick start:

1. Open a business bank account (if you don't have one)
2. Choose a tracking method (CentSense, spreadsheet, or accounting software)
3. Scan your first receipt
4. Set a recurring calendar reminder (weekly or monthly)

At tax time, you'll thank yourself.

Track business expenses with CentSense (free 10 scans/month) →

Further Reading

• 27 Tax Deductions for Freelancers →
• Small Business Expense Categories Guide →
• Self-Employment Tax Explained →