Self-Employed Tax Guide: Deductions, Quarterly Payments, and Retirement Accounts

Self-employment offers freedom and flexibility, but it comes with complex tax responsibilities. Unlike employees who have taxes automatically withheld, self-employed individuals must manage their own tax obligations.

This comprehensive guide covers everything self-employed workers need to know about taxes, from deductions to retirement planning.

Self-Employment Tax Basics

What Is Self-Employment Tax?

Self-employment tax: Social Security and Medicare taxes for self-employed individuals.

Rate: 15.3% on net self-employment income

• Social Security: 12.4% (on first $176,100 in 2026)

• Medicare: 2.9% (no limit)

• Additional Medicare: 0.9% (on income over $200,000/$250,000 married)

Comparison to employees: TaxEmployeeEmployerSelf-Employed Social Security6.2%6.2%12.4% Medicare1.45%1.45%2.9% Total7.65%7.65%15.3%

Deduction: You can deduct half of self-employment tax from income.

Who Pays Self-Employment Tax?

You owe SE tax if:

• Net self-employment income is $400 or more

• You are a sole proprietor, partner, or LLC member

• You have freelance or contract income

• You run a side business

Calculating Self-Employment Tax

Step 1: Calculate net self-employment income (gross income minus business expenses).

Step 2: Multiply by 92.35% (accounts for employer-equivalent portion).

Step 3: Apply SE tax rate (15.3%).

Example:

• Net SE income: $100,000

• SE income subject to tax: $100,000 x 92.35% = $92,350

• SE tax: $92,350 x 15.3% = $14,130

Use our Salary Calculator to estimate take-home pay.

Quarterly Estimated Taxes

Why Quarterly Payments?

The requirement: If you expect to owe $1,000+ in taxes, you must make quarterly payments.

Penalty for underpayment: Interest charges on amounts not paid quarterly.

Due Dates

QuarterIncome PeriodDue Date Q1Jan 1 - Mar 31April 15 Q2Apr 1 - May 31June 15 Q3Jun 1 - Aug 31September 15 Q4Sep 1 - Dec 31January 15

Calculating Quarterly Payments

Safe harbor methods: 1. Pay 100% of last year's tax liability (110% if AGI > $150,000) 2. Pay 90% of current year's expected tax

Simple approach: Total expected tax / 4 = quarterly payment.

Example:

• Expected income: $120,000

• Expected deductions: $30,000

• Taxable income: $90,000

• Federal tax: ~$14,000

• SE tax: ~$13,000

• Total: ~$27,000

• Quarterly payment: $6,750

How to Pay

Options:

• IRS Direct Pay (irs.gov)

• EFTPS (Electronic Federal Tax Payment System)

• Credit/debit card (fees apply)

• Check with Form 1040-ES

State taxes: Separate quarterly payments required in most states.

Business Deductions

Common Self-Employment Deductions

Home office deduction: MethodCalculationEasier? Simplified$5 per sq ft (max 300 sq ft = $1,500)Yes Actual(Office sq ft / total sq ft) x housing costsNo

Requirements: Space used regularly and exclusively for business.

Vehicle expenses: Method2026 RateBest For Standard mileage67 cents/mileMost people Actual expensesTrack all costsHigh mileage

Track: Date, destination, purpose, miles for every business trip.

Other Common Deductions

CategoryExamples Office suppliesPaper, pens, printer ink SoftwareAccounting, design, productivity Professional servicesLegal, accounting, consulting MarketingAdvertising, website, business cards TravelFlights, hotels, meals (50%) EducationCourses, certifications, books InsuranceHealth (100%), liability, E&O EquipmentComputer, phone, furniture UtilitiesInternet, phone (business portion)

Health Insurance Deduction

Self-employed health insurance deduction:

• 100% of premiums deductible

• Includes spouse and dependents

• Cannot exceed net self-employment income

• Deducted from gross income (not Schedule C)

What qualifies:

• Health insurance premiums

• Dental insurance

• Long-term care insurance (age-based limits)

Retirement Plan Deduction

Self-employed retirement options: Plan2026 LimitBest For SEP-IRA25% of net SE income, max $70,000Simple, high income Solo 401(k)$23,500 + 25% employer, max $70,000Maximum contribution SIMPLE IRA$16,500 + 3% matchLower income

Read our Self-Employed Retirement Guide for detailed comparisons.

Entity Selection

Sole Proprietorship

Default structure: No separate entity.

Pros:

• Simple, no paperwork

• All income/losses on personal return

• No separate tax filing

Cons:

• No liability protection

• All SE tax applies

• Limited credibility

Single-Member LLC

Similar to sole prop for taxes (unless you elect otherwise).

Pros:

• Liability protection

• Flexibility

• Separate business identity

Cons:

• State fees

• Still subject to full SE tax

• More paperwork

S-Corporation

Potential tax savings for profitable businesses.

How it works: 1. Pay yourself reasonable salary 2. Take remaining profit as distribution 3. Only salary subject to SE tax

Example ($150,000 net income): StructureSE Tax Sole Prop~$21,000 S-Corp ($80k salary)~$12,000 Savings~$9,000

Considerations:

• Payroll requirements

• Reasonable salary rules

• State fees and taxes

• Accounting costs

Rule of thumb: Consider S-Corp when net income exceeds $60,000-$80,000.

Record Keeping

What to Track

Income:

• All payments received

• Invoice dates and amounts

• Payment methods

• Client information

Expenses:

• Receipts for all purchases

• Mileage logs

• Home office measurements

• Asset purchase dates and costs

How Long to Keep Records

Record TypeRetention Period Tax returns7 years minimum Income records7 years Expense receipts7 years Asset recordsLife of asset + 7 years Payroll records7 years

Tools for Record Keeping

Accounting software:

• QuickBooks Self-Employed

• FreshBooks

• Wave (free)

• Xero

Receipt tracking:

• Expensify

• Receipt Bank

• Shoeboxed

• Phone camera + cloud storage

See our AI Tools Guide for accounting software reviews.

Tax Reduction Strategies

Maximize Retirement Contributions

Priority: Contribute maximum to retirement accounts.

Example savings: $20,000 Solo 401(k) contribution at 32% bracket = $6,400 tax savings.

Strategic Timing

Income timing:

• Delay invoicing to defer income

• Accelerate invoicing if lower bracket expected

• Consider fiscal year (C-Corps only)

Expense timing:

• Accelerate expenses into high-income years

• Defer expenses to years with higher deductions

• Bunch deductions strategically

QBI Deduction

Qualified Business Income (QBI) deduction: 20% deduction on qualified business income.

Limitations:

• Phase-out for service businesses at high incomes

• W-2 wage and property limits

• Complex calculations for higher earners

Example:

• Net business income: $100,000

• QBI deduction: $20,000

• Tax savings at 24%: $4,800

Hire Family Members

If you have children:

• Hire them for legitimate work

• Pay reasonable wages

• They can fund Roth IRA

• Shift income to lower bracket

Spouse employment:

• Creates access to retirement accounts

• May provide health insurance options

• Requires legitimate work

Working with Professionals

When to Hire Help

Consider a CPA when:

• Income exceeds $75,000

• Multiple income streams

• Complex deductions

• Entity selection questions

• IRS correspondence

Consider a bookkeeper when:

• Many transactions

• Inventory management

• Time constraints

• Cash flow complexity

What to Look For

CPA selection criteria:

• Experience with self-employed clients

• Knowledge of your industry

• Proactive planning (not just compliance)

• Responsive communication

• Reasonable fees

Cost Expectations

ServiceTypical Cost Quarterly bookkeeping$100-300/month Annual tax prep (sole prop)$300-800 Annual tax prep (S-Corp)$800-2,000 Tax planning session$200-500

Common Mistakes

Underestimating Taxes

Problem: Spending all income without setting aside taxes.

Solution: Automatically transfer 25-30% of income to tax savings account.

Missing Deductions

Commonly missed:

• Home office

• Business mileage

• Professional development

• Bank fees

• Software subscriptions

• Retirement contributions

Poor Record Keeping

Problem: Cannot substantiate deductions if audited.

Solution: Track everything in real-time, not at tax time.

Not Making Quarterly Payments

Problem: Penalties and large April tax bill.

Solution: Automate quarterly payments.

Wrong Entity Structure

Problem: Paying more SE tax than necessary.

Solution: Review entity structure annually with tax professional.

Tax Calendar

Annual Tasks

WhenTask JanuaryFile prior year return (or extend) Make Q4 estimated payment Gather tax documents AprilFile return or extension Make Q1 estimated payment JuneMake Q2 estimated payment SeptemberMake Q3 estimated payment DecemberReview tax situation Make year-end purchases Max retirement contributions

Monthly Tasks

• Reconcile accounts

• Review income and expenses

• Update mileage log

• Organize receipts

• Project quarterly tax

Action Steps

Getting Started

1. Set up separate business bank account 2. Choose accounting software 3. Establish record-keeping system 4. Calculate estimated quarterly payments 5. Set up tax savings account

Quarterly Review

1. Review income and expenses 2. Calculate estimated tax 3. Make quarterly payment 4. Update projections 5. Adjust withholdings/payments if needed

Year-End

1. Review deductions 2. Make planned purchases 3. Maximize retirement contributions 4. Gather documents for tax prep 5. Meet with tax professional

Conclusion

Self-employment taxes are complex but manageable with proper planning and systems. The keys are staying organized throughout the year, making timely estimated payments, and maximizing legitimate deductions.

Consider working with a tax professional, especially as your business grows. The cost is often recovered through tax savings from properly structured planning.

Use our Budget Calculator to build tax payments into your financial plan, and explore our Guides for more business and tax strategies.