Ch6. Tax Saving Guide — Self-Employment and Business Income Tax Planning

The Self-Employed Tax Landscape

W-2 employees have taxes withheld automatically by their employer. Freelancers and self-employed individuals must handle every aspect of their tax obligations themselves.

Major taxes for self-employed individuals and sole proprietors:
1. Federal Income Tax (Schedule C + Form 1040) — due April 15
2. Self-Employment Tax (SE Tax) — 15.3% on net SE earnings
   (Equivalent to both the employee AND employer share of FICA taxes)
3. Quarterly Estimated Taxes — April 15, June 17, September 16, January 15
4. State Income Tax — varies by state
5. Sales Tax — if selling tangible goods or certain services (varies by state)

Self-Employment Income Calculation

Basic Structure

Net Business Income (Schedule C):
  Gross Business Revenue
− Ordinary and Necessary Business Expenses (IRC § 162)
= Net Profit (or Loss)

Your tax liability is based on this net figure.
Deducting every legitimate business expense is the most direct way to reduce taxes.

Income Reporting Methods

Cash Method — Most small businesses and sole proprietors

Income recognized when received; expenses deducted when paid.
Simple to use; aligns with bank statements.

Accrual Method — Larger businesses or inventory-heavy

Income recognized when earned; expenses recognized when incurred, regardless of cash flow.

Single-Entry Bookkeeping — Basic records

Suitable for very small operations; tracks income and expenses in a simple ledger.

Double-Entry Bookkeeping — More rigorous

Records every transaction as both a debit and a credit. Required for larger businesses and strongly recommended once revenue grows. Allows precise expense matching and audit-defensible records.

Core Tax Strategy: Maximize Deductible Business Expenses

The most effective tax-reduction tool for the self-employed is claiming every ordinary and necessary business expense with proper documentation.

Home Office Deduction (IRC § 280A)

Regular and exclusive business use required.

Two methods:
① Simplified method: $5 per square foot, up to 300 sq ft = max $1,500/year
② Regular method: Actual expenses × (business sq ft / total sq ft)
   Includes: mortgage interest or rent, utilities, depreciation, repairs
   Example: 200 sq ft office in 2,000 sq ft home = 10% of home expenses

Note: For employees working remotely (W-2), home office deduction is
currently suspended through 2025 under TCJA.

Equipment and Technology

Computers, laptops, monitors, phones (business portion)
Software subscriptions (Adobe, Microsoft 365, accounting software)
Office supplies
Printers, scanners, peripherals

Expensing options:
- IRC § 179: Immediately deduct up to $1,220,000 (2024) of qualifying property
- Bonus Depreciation: 60% bonus first-year deduction in 2024 (phasing down)
- MACRS Depreciation: Spread deduction over asset's useful life

Professional Development

Business-related courses, online learning platforms
Seminars, conferences, trade shows (registration fee + travel)
Books and professional publications (business related)
Professional certifications and licensing fees

Travel and Transportation

Business vehicle expenses (two methods):
① Standard mileage rate: 67 cents/mile (2024) for business miles driven
② Actual expense method: Gas, insurance, repairs, depreciation × business use %

Business travel (away from home overnight):
- Airfare, train, rental car: 100% deductible
- Hotel: 100% deductible
- Meals while traveling: 50% deductible

Local transportation:
- Client meetings, bank trips, post office: deductible
- Commuting to a regular place of business: NOT deductible

Marketing and Client Development

Website design, hosting, domain registration
Social media advertising, Google Ads
Business cards, brochures, samples
Meals with clients (50% deductible — business meals, IRC § 274)
Entertainment expenses: Generally NOT deductible since TCJA 2017

Entity Selection and Tax Planning

Sole Proprietor / Single-Member LLC

All net income passes through to Schedule C. Subject to both income tax and self-employment tax (15.3%).

SE Tax rate: 15.3% on first $168,600 (2024); 2.9% on amounts above
(12.4% Social Security + 2.9% Medicare)
Self-employed individuals deduct half of SE tax as an above-the-line adjustment.

Example — $100,000 net profit:
SE tax = $100,000 × 92.35% × 15.3% = ~$14,130
Deduction for half SE tax: ~$7,065
Federal income tax on remaining income (estimated, at 22%): ~$20,444
Total federal burden: ~$34,574

S Corporation Strategy

An S corporation allows an owner-employee to split income between salary (subject to payroll taxes) and distributions (not subject to payroll taxes).

Key rules:
- Must pay yourself "reasonable compensation" (IRS scrutinizes low salaries)
- Distributions above salary avoid 15.3% SE tax

Example — $100,000 net profit via S corp:
Reasonable salary: $60,000 → payroll taxes ≈ $9,180
Distribution: $40,000 → no payroll taxes
vs. sole proprietor: payroll taxes ≈ $14,130
Savings: ~$4,950 (less S corp administration costs)

When to consider S corp election:
- Net self-employment income consistently above $40,000–$50,000/year
- The tax savings must exceed the additional compliance costs (payroll, separate return)

LLC Tax Treatment Options

Single-member LLC: Taxed as sole proprietor by default (Schedule C)
Multi-member LLC: Taxed as partnership by default (Form 1065)
LLC with S corp election: File Form 2553; treated as S corporation
LLC with C corp election: File Form 8832; treated as C corporation (21% flat rate)

Qualified Business Income (QBI) Deduction (IRC § 199A)

Self-employed individuals and pass-through entity owners may deduct up to 20% of Qualified Business Income — one of the most significant deductions introduced by TCJA.

Basic calculation:
QBI Deduction = Lesser of (20% of QBI) OR (20% of taxable income minus net capital gain)

Limitations apply above income thresholds:
2024 thresholds: $182,050 single / $364,200 MFJ
Above these amounts: W-2 wage limitation and UBIA of property limitation apply

Specified Service Trades or Businesses (SSTBs):
Professionals in law, health, accounting, consulting, financial services, etc.
→ Deduction phases out completely above $232,050 single / $464,200 MFJ

Example — $100,000 net profit (non-SSTB, below threshold):
QBI deduction = $100,000 × 20% = $20,000
If at 22% marginal rate: $20,000 × 22% = $4,400 additional tax savings
Effectively brings the top marginal rate on pass-through income to ~29.6%

Self-Employment Tax Strategies (SE Tax Reduction)

Above-the-line deductions available to self-employed:
① Half of SE tax (IRC § 164(f))
② Self-employed health insurance premiums (IRC § 162(l))
   - 100% deductible for sole proprietor + spouse + dependents
③ SEP-IRA or Solo 401(k) contributions
   - SEP-IRA: Up to 25% of net SE income, max $69,000 (2024)
   - Solo 401(k): Employee side $23,000 + employer side up to $46,000 = total $69,000
④ QBI deduction (§ 199A, up to 20% of QBI)

Combined effect:
$100,000 net profit minus:
  Half SE tax: −$7,065
  Health insurance: −$8,000 (example)
  SEP-IRA: −$19,600 (25% of $78,400 after SE adjustment)
  QBI deduction: −$13,067 (20% of remaining)
Federal taxable income reduced by ~$47,732

Estimated Tax Payments

Required if you expect to owe $1,000 or more in federal tax.
Penalties apply for underpayment (IRC § 6654).

2024 due dates:
- Q1: April 15
- Q2: June 17
- Q3: September 16
- Q4: January 15, 2025

Safe harbor rules (avoid penalty even if you underpay):
- Pay 100% of prior year's tax liability, OR
- Pay 90% of current year's actual liability
(If prior year AGI > $150,000: must pay 110% of prior year liability)

Practical approach:
Set aside 25–30% of each client payment in a separate savings account
for federal + state estimated taxes.

Sales Tax for Service Businesses

Federal government does NOT impose a general sales tax.
Sales tax is entirely a state and local matter.

Key points:
- Most states exempt services from sales tax (but some states are expanding to services)
- Digital products and SaaS: Tax treatment varies widely by state
- Physical goods: Almost always subject to sales tax in states with sales tax

Economic nexus (after South Dakota v. Wayfair, 2018):
- If you sell into a state and exceed ~$100,000 revenue or 200 transactions, you may owe
  sales tax in that state even without a physical presence
- Use software like TaxJar or Avalara to track nexus and collect/remit properly

Common Self-Employment Tax Mistakes

Mistake 1: Deducting personal expenses as business expenses

Personal meals, clothing, personal vacations mixed with business — only the business portion is deductible. The IRS scrutinizes these heavily.

Mistake 2: No documentation

Cash payments without receipts are difficult to defend in an audit. Use business credit cards or checks; retain receipts and bank statements for at least 3 years (6 years for significant items).

Mistake 3: Missing estimated tax payments

Many first-year freelancers skip estimated taxes and face a large balance due plus underpayment penalties in April. Build the habit from your first invoice.

Mistake 4: Failing to track mileage

The standard mileage deduction requires a contemporaneous log of business miles — destination, purpose, and mileage. Apps like MileIQ or Everlance make this simple.

Mistake 5: Forgetting SE tax in cash flow planning

Self-employment income is also subject to 15.3% SE tax on top of income tax. A freelancer earning $70,000 may owe$ 10,000+ in SE tax alone — plan for it.

Key Summary

Strategy	Expected Benefit
Maximize business deductions	Reduce taxable income by thousands
SEP-IRA / Solo 401(k)	Up to $69,000 deducted from SE income
S corp election	Reduce SE tax by $3,000–$ 10,000+/year
QBI deduction (§ 199A)	Effectively 20% off pass-through income
Self-employed health insurance	100% deductible premium
Home office deduction	$1,500+ depending on space and expenses

A self-employed taxpayer who actively manages their books, claims every legitimate deduction, and uses the right entity structure can save thousands to tens of thousands of dollars per year compared to one who files a bare Schedule C with no planning.

OIYO Editorial