Identifies commonly missed business tax deductions by industry and entity type with category lists and documentation requirements. Use this skill when a freelancer or small business owner is preparing for tax season, wants to reduce their tax bill, or needs to know what business expenses are deductible.
EVERY LEGITIMATE DEDUCTION MISSED IS MONEY LEFT ON THE TABLE — BUT EVERY UNSUPPORTED DEDUCTION IS AN AUDIT RISK. DOCUMENT EVERYTHING.
IMPORTANT: This skill provides general educational information about common business deductions. It does not constitute tax advice. Tax laws vary by jurisdiction, change frequently, and depend on individual circumstances. Always consult a qualified CPA or tax professional before claiming deductions. The information here is based on general US federal tax principles and may not apply to your specific situation.
Commonly Missed Deductions — Universal:
| Category | Examples | Often Missed? |
|---|---|---|
| Home Office | Dedicated workspace, percentage of rent/mortgage, utilities, internet | YES — many skip this |
| Vehicle/Mileage | Business miles at IRS standard rate, parking, tolls | YES — fail to track miles |
| Health Insurance | Self-employed health insurance premium deduction (Schedule 1) | YES — sole proprietors miss this |
| Retirement Contributions | SEP-IRA, Solo 401(k), SIMPLE IRA | YES — huge tax savings ignored |
| Self-Employment Tax | Deduct 50% of SE tax on Schedule 1 | YES — automatic but often unknown |
| Professional Development | Courses, certifications, conferences, books related to business | YES |
| Software & Subscriptions | SaaS tools, design apps, project management, accounting software | Sometimes |
| Business Insurance | Liability, E&O, professional indemnity, cyber insurance | Sometimes |
| Professional Services | CPA fees, legal fees, bookkeeping, business coaching | Sometimes |
| Bank & Processing Fees | Stripe fees, PayPal fees, merchant account fees, business bank fees | YES |
| Marketing & Advertising | Ads, sponsorships, business cards, website hosting, domain names | Rarely missed |
| Office Supplies & Equipment | Computers, desks, chairs, printers (Section 179 for big items) | Sometimes |
| Travel | Business flights, hotels, 50% of business meals | Sometimes |
| Phone & Internet | Business percentage of personal phone/internet bill | YES |
| Startup Costs | Up to $5,000 in first-year startup expenses (if under $50K total) | YES |
| Bad Debt | Invoices you were unable to collect on | YES |
| Continuing Education | Courses and training that maintain or improve current skills | Sometimes |
Content Creators (YouTube, Podcast, Social Media):
E-Commerce Sellers:
Freelancers & Consultants:
Coaches & Course Creators:
| Deduction | Required Documentation |
|---|---|
| Home Office | Square footage of office vs. total home, lease/mortgage statements, utility bills |
| Vehicle/Mileage | Mileage log (date, destination, business purpose, miles), gas receipts if using actual expense method |
| Meals | Receipt + note of who attended and business purpose discussed |
| Travel | Itinerary, receipts, business purpose documentation |
| Equipment (>$2,500) | Purchase receipt, date placed in service, business use percentage |
| Professional Development | Course receipt, description of how it relates to current business |
| All expenses | Receipt or bank/credit card statement showing amount, date, and vendor |
Profile: Solo graphic designer, works from home, earns $85,000/year, uses personal car for client meetings, pays for own health insurance.
Your Personalized Deduction Checklist:
TAX DEDUCTION CHECKLIST
Business: Freelance Graphic Design (Schedule C)
Tax Year: 2025
COMMONLY MISSED (check these first):
[x] Home Office Deduction
- Office: 150 sq ft of 1,200 sq ft apartment = 12.5%
- Simplified method: $5/sq ft x 150 = $750
- Regular method: 12.5% of rent ($1,800/mo x 12 = $21,600)
= $2,700 + 12.5% of utilities
- USE REGULAR METHOD: saves ~$1,950 more
[x] Self-Employed Health Insurance
- Monthly premium: $420/mo = $5,040/year
- Deducted on Schedule 1 (above-the-line, reduces AGI)
- This is NOT an itemized deduction — it reduces taxable income directly
[x] Retirement: SEP-IRA Contribution
- Can contribute up to 25% of net self-employment income
- On $85,000 net income: up to ~$17,700
- Deadline: tax filing deadline (including extensions)
[x] Vehicle Mileage
- 2,400 business miles x $0.70/mile (2025 rate) = $1,680
- Keep a mileage log app (MileIQ, Everlance, or manual)
[x] Self-Employment Tax Deduction
- Automatic: deduct 50% of SE tax on Schedule 1
- On $85K: SE tax ~$12,010, deduction = ~$6,005
[x] Phone & Internet (business percentage)
- Phone: 60% business use x $85/mo x 12 = $612
- Internet: 50% business use x $70/mo x 12 = $420
STANDARD DEDUCTIONS:
[x] Software: Adobe CC ($55/mo), Figma ($15/mo), Notion ($8/mo)
= $936/year
[x] Hardware: MacBook Pro purchased March 2025 ($2,499)
— Section 179: deduct full amount in year of purchase
[x] Professional development: Design conference ($800),
online course ($297) = $1,097
[x] Marketing: Portfolio hosting ($200), domain ($15),
LinkedIn Premium ($360) = $575
[x] Bank & processing fees: Stripe fees on invoices
~2.9% of $85,000 = $2,465
[x] Professional services: Bookkeeper ($150/mo x 12) = $1,800
[x] Office supplies: Paper, ink, external drive = ~$350
ESTIMATED TOTAL DEDUCTIONS: $41,329
AT 22% TAX BRACKET: ~$9,092 in federal tax savings
AT 15.3% SE TAX: additional ~$6,323 in SE tax savings
Profile: Handmade candle business, works from home studio, $48,000 revenue, attends 4 craft fairs per year.
Your Personalized Deduction Checklist:
TAX DEDUCTION CHECKLIST
Business: Ember & Sage Candle Co. (Schedule C / Single-Member LLC)
Tax Year: 2025
COMMONLY MISSED:
[x] Home Office (Studio Space)
- Dedicated studio: 200 sq ft of 1,500 sq ft home = 13.3%
- Regular method: 13.3% of mortgage interest, property tax,
utilities, insurance, repairs
- Estimated deduction: $3,200
[x] Startup Costs (if business started this year)
- Can deduct up to $5,000 in startup costs immediately
- Includes: market research, branding, initial inventory setup,
legal fees for LLC formation
[x] Vehicle Mileage
- Post office runs, supplier pickups, craft fair travel
- Estimated 1,800 miles x $0.70 = $1,260
[x] Phone & Internet (40% business use)
- $65/mo phone + $70/mo internet = $648/year
COST OF GOODS SOLD:
[x] Wax, fragrance oils, wicks, dyes = $8,400
[x] Jars, lids, labels = $3,200
[x] Packaging (boxes, tissue, stickers) = $1,400
[x] Shipping supplies = $1,100
Total COGS: $14,100
OPERATING EXPENSES:
[x] Shopify subscription ($79/mo x 12) = $948
[x] Canva Pro ($13/mo x 12) = $156
[x] Email marketing (Mailchimp, $20/mo x 12) = $240
[x] Instagram/Facebook ads = $2,400
[x] Product photography session = $500
[x] Craft fair booth fees (4 x $200) = $800
[x] Craft fair travel (hotels, meals at 50%) = $1,100
[x] Product liability insurance = $500/year
[x] Business bank account fee ($10/mo x 12) = $120
[x] Payment processing fees (Stripe/Shopify ~2.9%) = $1,392
[x] LLC annual filing fee = $50
[x] Bookkeeper ($100/mo x 12) = $1,200
ESTIMATED TOTAL DEDUCTIONS: $29,564
ON $48,000 REVENUE: taxable income reduced to ~$18,436