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1.1 Form 1040 Overview & Structure
Enrolled Agent EA
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1 Part 1, Chapter 1: Tax Return Basics & Filing Requirements
1.1 Form 1040 Overview & Structure 1.2 Form 1040-SR for Seniors 1.3 Who Must File (Income Thresholds) 1.4 Filing Deadlines & Extensions (Form 4868) 1.5 Penalties: Failure to File vs. Failure to Pay 1.6 Sources of Tax Information (W-2s, 1099s, K-1s) 1.7 Preparer Due Diligence Requirements 1.8 Amended Returns (Form 1040-X)
2 Part 1, Chapter 2: Filing Status & Dependents
2.1 Single & Married Filing Jointly 2.2 Married Filing Separately 2.3 Head of Household Requirements 2.4 Qualifying Surviving Spouse 2.5 Qualifying Child Test (5 Tests) 2.6 Qualifying Relative Test (4 Tests) 2.7 SSN, ITIN & Residency Status
3 Part 1, Chapter 3: Wages & Employee Compensation
3.1 W-2 Income & Withholding 3.2 Employee vs. Independent Contractor 3.3 1099-NEC, 1099-MISC & 1099-K Reporting 3.4 Fringe Benefits (Taxable vs. Non-Taxable) 3.5 Stock Options (ISO vs. NQSO) 3.6 Special Categories (Clergy, Military, Foreign)
4 Part 1, Chapter 4: Interest, Dividends & Other Income
4.1 Taxable vs. Tax-Exempt Interest 4.2 US Savings Bonds & OID 4.3 Ordinary vs. Qualified Dividends 4.4 Schedule B Requirements 4.5 Rental & Royalty Income Basics 4.6 Alimony, Gambling & Other Income 4.7 Cancelled Debt & Form 1099-C 4.8 Net Operating Loss (NOL)
5 Part 1, Chapter 5: Capital Gains & Property Transactions
5.1 Capital vs. Non-Capital Assets 5.2 Cost Basis Calculation 5.3 Inherited & Gifted Property Basis 5.4 Short-Term vs. Long-Term Gains 5.5 Capital Gains Tax Rates (0%, 15%, 20%) 5.6 Netting & the $3,000 Loss Limit 5.7 Wash Sales & Related Party Rules 5.8 Sale of Primary Residence (Section 121) 5.9 Installment Sales (Form 6252) 5.10 Like-Kind Exchanges (Section 1031)
6 Part 1, Chapter 6: Adjustments to Income
6.1 Educator Expenses & HSA Contributions 6.2 Self-Employment Tax Deduction 6.3 IRA Contributions (Traditional) 6.4 Student Loan Interest Deduction 6.5 Alimony Paid (Pre-2019 Divorces) 6.6 Other Adjustments & New OBBBA Deductions (Tips, Overtime, Auto Loan, Senior Bonus)
7 Part 1, Chapter 7: Deductions (Standard & Itemized)
7.1 Standard Deduction by Filing Status 7.2 Medical & Dental Expenses (7.5% Floor) 7.3 State & Local Taxes (SALT $40K Cap) 7.4 Mortgage Interest Deduction 7.5 Charitable Contributions 7.6 Casualty & Theft Losses 7.7 QBI Deduction (Section 199A)
8 Part 1, Chapter 8: Tax Calculation & Credits
8.1 Tax Tables & Rate Schedules 8.2 Alternative Minimum Tax (AMT) 8.3 Self-Employment Tax Calculation 8.4 Child Tax Credit & Additional CTC 8.5 Earned Income Tax Credit (EITC) 8.6 Education Credits (AOC & LLC) 8.7 Child & Dependent Care Credit 8.8 Other Credits (Saver's, Premium Tax)
9 Part 1, Chapter 9: Retirement Accounts & Social Security
9.1 Traditional vs. Roth IRA 9.2 401(k), 403(b) & TSP Basics 9.3 SEP-IRA & SIMPLE IRA 9.4 Required Minimum Distributions (RMDs) 9.5 Early Withdrawal Penalties & Exceptions 9.6 Social Security Taxation
10 Part 1, Chapter 10: Specialized Individual Returns
10.1 Estate Tax (Form 706) 10.2 Gift Tax (Form 709) 10.3 Foreign Income (Form 2555) 10.4 FBAR & FATCA Reporting 10.5 Farm Income (Schedule F) 10.6 Disaster Area Rules
11 Part 2, Chapter 11: Business Entity Types
11.1 Overview of Entity Types 11.2 State Law vs. Tax Classification 11.3 Entity Selection: Reasonable Comp & QBI 11.4 Form 8832 & Rev. Proc. 2009-41 11.5 LLC Deep Dive: Spouses & EINs 11.6 Changing Status: The 60-Month Rule
12 Part 2, Chapter 12: Starting a Business
12.1 Hobby vs. Business (Profit Motive) 12.2 Employer Identification Number (EIN) 12.3 Tax Year Selection 12.4 Recordkeeping Requirements 12.5 Statute of Limitations 12.6 Related Party Transactions 12.7 Start-Up Costs, Entity Choice & OBBBA Business Changes (2025)
13 Part 2, Chapter 13: Worker Classification & Payroll
13.1 Employee vs. Independent Contractor 13.2 Common Law Test (Behavioral, Financial, Relationship) 13.3 Statutory Employees & Non-Employees 13.4 Form 941 & Payroll Deposits 13.5 Trust Fund Recovery Penalty 13.6 FUTA & Unemployment Taxes
14 Part 2, Chapter 14: Accounting Methods & Income
14.1 Cash vs. Accrual Method 14.2 Hybrid Methods & Changes 14.3 Inventory & COGS 14.4 Gross Receipts & Income Recognition 14.5 Constructive Receipt 14.6 Form 1099 Reporting Requirements 14.7 §163(j) Business Interest Expense Limitation 14.8 §174 Research & Experimental Expenditures
15 Part 2, Chapter 15: Depreciation & Asset Treatment
15.1 MACRS Basics & Recovery Periods 15.2 Mid-Month, Mid-Quarter, Half-Year Conventions 15.3 Section 179 Expense Deduction 15.4 Bonus Depreciation 15.5 Listed Property Rules 15.6 Amortization of Intangibles 15.7 Depletion 15.8 Disposition of Business Assets
16 Part 2, Chapter 16: Business Deductions
16.1 Ordinary & Necessary Test 16.2 Business Travel Expenses 16.3 Business Meals (50% Limitation) 16.4 Business Use of Vehicle 16.5 Home Office Deduction 16.6 Business Interest Limitation (163(j)) 16.7 Business Bad Debts
17 Part 2, Chapter 17: Business Credits & Fringe Benefits
17.1 General Business Credit Overview 17.2 R&D Credit & Disabled Access Credit 17.3 Small Employer Health Insurance Credit 17.4 Fringe Benefit Rules 17.5 Cafeteria Plans (Section 125) 17.6 Achievement Awards & Other Benefits
18 Part 2, Chapter 18: Sole Proprietorships
18.1 Schedule C Overview 18.2 Calculating Net Profit/Loss 18.3 Self-Employment Tax (Schedule SE) 18.4 Estimated Tax Payments 18.5 Hobby Loss Rules
19 Part 2, Chapter 19: Partnerships
19.1 Partnership Formation 19.2 Partner's Basis Calculation 19.3 Form 1065 Overview 19.4 Schedule K-1 (Partner's Share) 19.5 Guaranteed Payments 19.6 Partnership Distributions 19.7 At-Risk & Passive Activity Rules 19.8 Partnership Termination & Liquidation
20 Part 2, Chapter 20: C Corporations
20.1 Form 1120 Overview 20.2 Corporate Tax Rate (21%) & CAMT 20.3 Accumulated Earnings Tax 20.4 Dividends Received Deduction 20.5 Earnings & Profits (E&P) 20.6 Corporate Distributions, Dividends & Stock Redemptions 20.7 §351 Transfers, §1032, §1202 QSBS & Other Corporate Provisions 20.8 Corporate Liquidation
21 Part 2, Chapter 21: S Corporations
21.1 S Election Requirements (Form 2553) 21.2 Form 1120-S Overview 21.3 Shareholder Basis Calculation 21.4 Reasonable Compensation 21.5 S Corporation Distributions 21.6 Built-In Gains Tax & Termination
22 Part 2, Chapter 22: Specialized Business Returns
22.1 Trusts & Estates (Form 1041) 22.2 Simple vs. Complex Trusts 22.3 Distributable Net Income (DNI) 22.4 Tax-Exempt Organizations (Form 990) 22.5 Retirement Plans (Form 5500) 22.6 Qualified Retirement Plans Overview 22.7 Farm Taxation 22.8 Rental Real Estate Activities
23 Part 3, Chapter 23: Practice Before the IRS
23.1 What is Practice Before the IRS? 23.2 Who Can Practice (Full Rights) 23.3 Limited Practice Rights (AFSP, Unenrolled) 23.4 Special Relationships (Family, Employees) 23.5 PTIN Requirements 23.6 Circular 230 Overview 23.7 Office of Professional Responsibility (OPR)
24 Part 3, Chapter 24: Becoming & Maintaining EA Status
24.1 Two Paths to EA (Exam vs. IRS Experience) 24.2 Application Process (Form 23) 24.3 Background & Compliance Checks 24.4 Renewal Requirements (Form 8554) 24.5 Continuing Education Requirements 24.6 Inactive Status & Termination
25 Part 3, Chapter 25: Practitioner Duties (Circular 230)
25.1 Due Diligence Requirements 25.2 Knowledge of Client's Omission 25.3 Conflict of Interest Rules 25.4 Fee Requirements (Contingent, Unconscionable) 25.5 Advertising & Solicitation Rules 25.6 Tax Return Position Standards 25.7 Written Advice Standards 25.8 Sanctions & Penalties for Violations
26 Part 3, Chapter 26: Power of Attorney & Authorization
26.1 Form 2848 (Power of Attorney) 26.2 CAF (Centralized Authorization File) 26.3 Form 8821 (Tax Information Authorization) 26.4 Third-Party Designee 26.5 Signing Returns for Taxpayers 26.6 Client Confidentiality & Privilege 26.7 Representing Clients in Audits (Examination) 26.8 Appealing IRS Decisions 26.9 Collection Representation
27 Part 3, Chapter 27: Legal Authority & Research
27.1 Hierarchy of Tax Authority 27.2 Internal Revenue Code 27.3 Treasury Regulations 27.4 Revenue Rulings & Procedures 27.5 Court Cases & Precedent 27.6 Statutes of Limitations
28 Part 3, Chapter 28: Specific Representation Issues
28.1 Trust Fund Recovery Penalty (TFRP) 28.2 Innocent Spouse Relief (Form 8857) 28.3 Injured Spouse Allocation (Form 8379) 28.4 Penalty Abatement (FTA & Reasonable Cause) 28.5 Taxpayer Advocate Service (TAS) 28.6 Freedom of Information Act (FOIA)
29 Part 3, Chapter 29: Final Review & Exam Strategy
29.1 Exam Structure & Logistics (2026-2027) 29.2 The "Clock" of Representation (Master Deadlines) 29.3 Ethics vs. Law (Sanctions & Penalties) 29.4 Final Mock Review & Exam Strategy
30 Part 3, Chapter 30: Filing Process & E-File
30.1 E-File Requirements (The "More Than 10 Returns" Rule) 30.2 ERO Responsibilities 30.3 EFIN & Application Process 30.4 Form 8879 (Signature Authorization) 30.5 Record Retention & Data Security (WISP) 30.6 Preparer Penalties (Filing Specific)
1.1 Form 1040 Overview & Structure
Key Takeaways Explain This Topic AI
Form 1040 is the primary tax return for U.S. citizens and residents to report annual income and calculate tax liability
The form flows from Gross Income to Adjusted Gross Income (AGI) to Taxable Income to Total Tax to Amount Owed/Refund
Adjusted Gross Income (AGI) on Line 11 is a critical checkpoint used throughout the tax code for phase-outs and limitations
Numbered schedules (1, 2, 3) report additional income, taxes, and credits, while lettered schedules (A, B, C, D, E) report specific types of income or deductions
2025 standard deduction amounts (post-OBBBA): $15,750 (Single), $31,500 (MFJ), $23,625 (HoH), $15,750 (MFS)
- The personal exemption is $0 (permanently eliminated by OBBBA, July 4, 2025)
- Last updated: October 2026
Every individual tax return starts with Form 1040. Whether you're preparing returns for a first-time filer or a complex client with multiple income sources, understanding how this form flows is fundamental to your success on the EA exam and in practice.
What Is Form 1040?
Form 1040, U.S. Individual Income Tax Return is the standard federal income tax form used by U.S. citizens and residents to report their annual income and calculate their tax liability. The IRS processes over 150 million individual returns annually, and Form 1040 is the backbone of this system.
For 2025, taxpayers use Form 1040 or, if born before January 2, 1961, may optionally use Form 1040-SR (which features larger print but identical calculations). Both forms use the same schedules and instructions.
The Tax Return Flow: Big Picture
Before diving into specific lines, understand the logical flow of a tax return. Think of it as a funnel that narrows down to your final tax liability:
- Step What Happens Key Line
- 1. Gross Income Add all taxable income sources Lines 1-8
- 2. Adjustments to Income Subtract "above-the-line" deductions Schedule 1, Part II
- 3. Adjusted Gross Income (AGI) Critical checkpoint for many tax benefits Line 11
- 4. Deductions Subtract standard or itemized deductions + QBI Lines 12-14
- 5. Taxable Income The amount subject to tax rates Line 15
- 6. Tax Calculation Apply tax tables or rate schedules Line 16
- 7. Credits Reduce tax dollar-for-dollar Lines 19-21
- 8. Other Taxes Add self-employment tax, etc. Schedule 2
- 9. Total Tax Your complete tax liability Line 24
- 10. Payments Subtract withholding and estimated payments Lines 25-33
- 11. Refund/Amount Owed Final result Lines 34-37
- Page-by-Page Breakdown
- Page 1 (Top Section)
- Taxpayer identification: Names, Social Security numbers, addresses
- Filing status checkboxes (Single, MFJ, MFS, HOH, QSS)
- Digital assets question (new requirement)
- Presidential Election Campaign Fund checkbox
- Page 1 (Income Section - Lines 1-11)
- Line 1 : Wages, salaries, tips (from W-2s)
- Line 2 : Interest income (2a tax-exempt, 2b taxable)
- Line 3 : Dividend income (3a qualified, 3b ordinary)
- Line 4 : IRA distributions (4a gross, 4b taxable)
- Line 5 : Pensions and annuities (5a gross, 5b taxable)
- Line 6 : Social Security benefits (6a gross, 6b taxable)
- Line 7 : Capital gain or loss (from Schedule D)
- Line 8 : Additional income from Schedule 1
- Line 9 : Total income (sum of lines 1-8)
- Line 10 : Adjustments to income from Schedule 1
- Line 11 : Adjusted Gross Income (AGI) - This is the most important checkpoint on the return
- Page 1 (Deductions - Lines 12-15)
- Line 12 : Standard deduction OR itemized deductions (from Schedule A)
- Line 13 : Qualified Business Income (QBI) deduction
- Line 14 : Total deductions (Line 12 + Line 13)
- Line 15 : Taxable Income (Line 11 minus Line 14)
- Page 2 (Tax and Credits - Lines 16-24)
- Line 16 : Tax (from Tax Tables, Tax Computation Worksheet, or Schedule D)
- Lines 17-18 : Additional taxes from Schedule 2
- Lines 19-21 : Credits (child tax credit, other credits from Schedule 3)
- Line 22 : Net tax after credits
- Line 23 : Other taxes from Schedule 2, Part II
- Line 24 : Total Tax
- Page 2 (Payments - Lines 25-33)
- Line 25 : Federal income tax withheld (from W-2s and 1099s)
- Line 26 : Estimated tax payments
- Line 27 : Earned Income Credit (EIC)
- Lines 28-32 : Additional refundable credits
- Line 33 : Total payments
- Page 2 (Refund/Amount Owed - Lines 34-37)
- Line 34 : Overpayment (if payments exceed tax)
- Line 35-36 : Refund options (direct deposit or check)
- Line 37 : Amount owed (if tax exceeds payments)
- The Importance of Adjusted Gross Income (AGI)
Your AGI from Line 11 is the most important number on the tax return. It serves as the baseline for dozens of "phase-outs"—income levels where tax benefits begin to be reduced or eliminated.
AGI affects:
- IRA contribution deductibility
- Student loan interest deduction limits
- Itemized deduction limitations
- Premium Tax Credit eligibility
- Education credit phase-outs
- And many more tax provisions
- Formula : AGI = Gross Income - Adjustments to Income
The adjustments (from Schedule 1, Part II) are sometimes called "above-the-line" deductions because they appear above the AGI line. Common adjustments include:
- Educator expenses (up to $300 for 2025)
- Health savings account (HSA) contributions
- Self-employment tax deduction (50%)
- Self-employed health insurance premiums
- IRA contributions (if deductible)
- Student loan interest (up to $2,500)
- Alimony paid (for divorces finalized before 2019)
- 2025 Standard Deduction Amounts (post-OBBBA)
Most taxpayers claim the standard deduction rather than itemizing. The One Big Beautiful Bill Act (OBBBA, signed July 4, 2025) raised the original Rev. Proc. 2024-40 amounts retroactively for 2025:
- Filing Status Standard Deduction
- Single $15,750
- Married Filing Jointly $31,500
- Married Filing Separately $15,750
- Head of Household $23,625
- Qualifying Surviving Spouse $31,500
Additional Standard Deduction for Age or Blindness (2025) :
- Single/HOH: Add $2,000 per qualifying condition
- MFJ/MFS/QSS: Add $1,600 per qualifying individual per condition
NEW OBBBA Senior Bonus Deduction (tax years 2025-2028) : Additional $6,000 per qualifying individual age 65+; phases out at 6% above MAGI $75K (Single/HoH) or $150K (MFJ) and is fully phased out at $175K / $250K. Available to standard-deduction users AND itemizers. Stacks on top of the existing $2,000/$1,600 age-65 amount. MFS not eligible.
Personal exemption: $0. OBBBA permanently eliminated the personal exemption (which had been scheduled to potentially return after the TCJA sunset).
Example : A married couple filing jointly, both age 65, receives the base $31,500 + $1,600 + $1,600 = $34,700 base. If MAGI is below $150K, they may also claim a $6,000 senior bonus per qualifying spouse, adding up to $12,000 more.
The Numbered Schedules (1, 2, 3)
These three schedules serve as "overflow" pages for the main Form 1040:
Schedule 1 - Additional Income and Adjustments to Income
- Part Purpose Common Items
- Part I Additional Income Business income, capital gains, unemployment, alimony received, gambling winnings
Part II Adjustments to Income Student loan interest, HSA contributions, self-employment tax deduction, educator expenses
Schedule 2 - Additional Taxes
- Part Purpose Common Items
- Part I Tax Alternative Minimum Tax (AMT), excess advance PTC repayment
Part II Other Taxes Self-employment tax, household employment tax, additional Medicare tax, net investment income tax
Schedule 3 - Additional Credits and Payments
- Part Purpose Common Items
- Part I Nonrefundable Credits Foreign tax credit, education credits, residential energy credits
- Part II Other Payments Excess Social Security withholding, Form 4868 payments
- The Lettered Schedules
Lettered schedules report specific types of income, deductions, or calculations:
- Schedule Title When Required
- A Itemized Deductions Itemizing instead of standard deduction
- B Interest and Dividends Interest/dividends exceed $1,500, or special situations
- C Profit or Loss from Business Self-employed individuals (sole proprietors)
- D Capital Gains and Losses Sold stocks, bonds, real estate, or other capital assets
- E Supplemental Income Rental income, royalties, partnerships, S corps, trusts
- F Profit or Loss from Farming Farmers reporting farm income
- H Household Employment Taxes Paid $2,800 or more to any one household employee in 2025
- R Credit for Elderly/Disabled Claiming this specific credit
- SE Self-Employment Tax Self-employment income of $400 or more
- How Everything Connects
Think of Form 1040 as the "summary page" with schedules providing the supporting details:
- Schedule C calculates net business profit → flows to Schedule 1, Line 3 → flows to Form 1040, Line 8
- Schedule D calculates net capital gain/loss → flows directly to Form 1040, Line 7
- Schedule A calculates itemized deductions → flows to Form 1040, Line 12
- Schedule SE calculates self-employment tax → flows to Schedule 2, Line 4 → flows to Form 1040, Line 23
- On the EA Exam
The EA exam tests your understanding of Form 1040 structure in several ways:
- Identifying which line or schedule reports specific income types
- Understanding the flow from gross income to taxable income
- Knowing when each schedule is required
- Calculating AGI and taxable income
- Understanding the difference between "above-the-line" and "below-the-line" deductions
Exam Tip : When a question asks about "adjustments to income," think Schedule 1, Part II and above-the-line deductions. When it asks about "itemized deductions," think Schedule A and below-the-line deductions.