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Unit 4: Self-Employment

Master Schedule C business income and deductions, 15.3% self-employment tax, estimated payments, the 20% QBI deduction, and year-round advisory strategies for 2026.

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Shmuel Eagle

Shmuel Eagle

Instructor

Unit 4: Self-Employment

What Will You Learn

  • Classify workers as employees or independent contractors using control tests
  • Apply the 3-of-5 year profit motive test and explain disallowed hobby costs
  • Report all business revenue from 1099-NEC, 1099-K, cash, checks, and apps
  • Calculate 15.3% SE tax on 92.35% of net profit and deduct half on Schedule 1
  • Calculate quarterly Form 1040-ES payments and apply 90%/100%/110% safe harbors
  • Apply the IRC §162 ordinary and necessary standard to business write-offs
  • Calculate home office deductions using simplified $5/sq ft or actual method
  • Deduct vehicle expenses using 2026 72.5¢ standard rate or actual cost log
  • Apply the 20% Qualified Business Income deduction under 2026 thresholds
  • Guide clients on retirement plans, S-corp election signals, and books

About This Class

Course & Unit Overview: Self-Employment & Schedule C (Classes 14–16)

Welcome to Unit 4 of BlueLink Academy’s 1040 Income Tax Preparation Course. Small businesses and 1099 independent contractors represent the fastest-growing client segment in personal tax preparation. This unit provides comprehensive training on reporting sole proprietorship income on Schedule C, maximizing legitimate business deductions, navigating depreciation on Form 4562, and calculating Self-Employment Tax on Schedule SE.

The Preparer's Mindset

Schedule C is the highest-audit schedule on Form 1040. As a preparer, your value lies in helping clients claim every dollar of expense they are legally entitled to while enforcing the strict substantiation standards that protect them—and your firm—from IRS examination penalties.

Unit Curriculum Architecture

Class 14

Schedule C Income & Classification

Sole proprietorships, single-member LLCs, Form 1099-NEC/1099-K reconciliation, and cash accounting.

Class 15

Business Expenses & Deductions

IRC §162 ordinary & necessary tests, standard vs actual mileage, home office Form 8829, and depreciation on Form 4562.

Class 16

Self-Employment Tax & Estimated Payments

Schedule SE 15.3% tax computation, 50% deduction on Schedule 1, and Form 1040-ES quarterly safe harbors.

Unit Quick Reference Table

Self-Employment Concept Tax Form / Line 2026 Statutory Rate / Rule
Business Mileage Rate Schedule C Part IV 67.0 cents per business mile (contemporaneous log required)
Simplified Home Office Schedule C Line 30 $5.00 per sq ft (max 300 sq ft = $1,500 maximum deduction)
De Minimis Safe Harbor Form 1040 Attachment Expense tangible items up to $2,500 per invoice directly
Self-Employment Tax Rate Schedule SE 15.3% (12.4% Social Security + 2.9% Medicare on 92.35% profit)
Quarterly Estimated Safe Harbor Form 1040-ES / Form 2210 100% prior year tax (110% if AGI > $150k) or 90% current year
Requirements
  • Completion of Unit 1 (Filing Status), Unit 2 (Income), and Unit 3
  • Understanding of gross income, AGI, and basic business concepts
  • Access to a calculator, spreadsheet, or tax preparation software
  • Reference to 2026 self-employment tax rates and wage base caps
  • No prior CPA license or advanced accounting credential required

Frequently Asked Questions

If a client did not receive a Form 1099-NEC, do they still have to report their business income?
Yes. All business income is reportable on Schedule C regardless of whether a 1099 was issued or if paid in cash, check, or app.
What is the difference between an employee and an independent contractor?
It turns on control under the IRS 3-factor test: Behavioral control, Financial control, and Relationship of the parties. Form SS-8 determines doubtful cases.
Why do self-employed clients often owe substantially more tax than W-2 employees with the same income?
Self-employed individuals pay the full 15.3% self-employment tax (both employee and employer halves of FICA) on 92.35% of net profit, on top of income tax.
How does the above-the-line deduction for self-employment tax work?
Self-employed taxpayers deduct exactly 50% (half) of their calculated SE tax on Schedule 1 Line 15, reducing Adjusted Gross Income (AGI).
When are quarterly estimated tax payments due, and what safe harbors prevent penalties?
Due Apr 15, Jun 15, Sep 15, Jan 15. Safe harbors: pay 90% of current-year tax or 100% of prior-year tax (110% if prior AGI > $150,000).
Can a client deduct their home office if their desk is in their bedroom?
No. A home office must meet both the exclusive and regular use tests. A bedroom serves personal functions, violating the strict exclusive use rule.
What are the two methods for claiming business vehicle expenses in 2026?
The standard mileage rate (72.5¢/mile) or actual vehicle expenses. Both legally require a contemporaneous mileage log showing date, miles, and purpose.
How are business meals and entertainment treated for 2026?
Business meals are 50% deductible with documentation. Entertainment is 0% deductible. Employer cafeteria meals became 100% non-deductible in 2026.
What is the Qualified Business Income (QBI) deduction, and what does the client have to spend to get it?
Eligible self-employed individuals deduct up to 20% of net QBI from taxable income under IRC §199A. It is automatic under $201,750 S / $403,500 MFJ.
When should a sole proprietor consider electing S-corporation taxation?
When net profit consistently reaches ~$80,000+, profit above a reasonable W-2 salary escapes SE tax. But the salary must be reasonable and defensible.

Meet Your Instructors

Shmuel Eagle

Shmuel Eagle

Lead Tax Instructor

Co-founder of BlueLink with 15+ years in tax preparation and office management.

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