Comprehensive Income Tax Concepts & Regulations

Vocabulary flashcards covering fundamental tax concepts, tax structures, compliance, planning strategies, and income/deduction definitions from Chapters 1 through 6.

Tax

A payment required by a government that is unrelated to any specific benefit or service received from the government.

Earmarked Tax

A tax assessed for a specific purpose where the payment made by the taxpayer does not directly relate to the specific benefit received.

Sin Taxes

Relatively high surcharges imposed on alcohol and tobacco products.

Tax Base

The measure that defines what is actually taxed, usually expressed in monetary terms.

Tax Rate

The level of taxes imposed on the tax base, usually expressed as a percentage.

Flat Tax (Proportional Tax Structure)

A tax rate structure that imposes a constant tax rate throughout the tax base, keeping the marginal tax rate constant and equal to the average tax rate.

Graduated / Progressive Taxes

A tax rate structure where the tax base is divided into brackets, imposing an increasing marginal tax rate as the tax base increases.

Regressive Tax Rate Structure

A tax rate structure that imposes a decreasing marginal tax rate as the tax base increases, such as Social Security tax.

Marginal Tax Rate Formula

The incremental tax paid on an incremental amount of additional income or deductions, calculated as $\frac{\Delta\text{Tax}}{\Delta\text{Taxable Income}} = \frac{\text{New Total Tax} - \text{Old Total Tax}}{\text{New Taxable Income} - \text{Old Taxable Income}}$.

Average Tax Rate

The average level of taxation on each dollar of taxable income, calculated as $\frac{\text{Total Tax}}{\text{Taxable Income}}$.

Effective Tax Rate

The taxpayer's average rate of taxation on each dollar of total income (taxable and nontaxable income), calculated as $\frac{\text{Total Tax}}{\text{Total Income}}$.

Unemployment Taxes

Employment taxes that fund temporary unemployment benefits for individuals terminated from their jobs without cause.

Social Security Tax

An employment tax (OASDI) that pays monthly retirement, survivors, and disability benefits for qualifying individuals.

Medicare Tax

An employment tax (MHI) that pays for medical insurance for individuals who are elderly or disabled.

Excise Tax

A tax levied on the retail sale of particular products based on the quantity purchased rather than a monetary amount.

Sales Tax

A state or local tax where the tax base is the retail price of goods and some services, collected by retailers at the point of sale.

Use Tax

A tax based on the retail price of goods owned, possessed, or consumed within a state that were not purchased within that state.

Ad Valorem Taxes

Property taxes whose tax base is determined by the property's fair market value.

Real Property

Property consisting of land, structures, and improvements permanently attached to land.

Personal Property

All types of tangible property (e.g., cars, equipment, inventory) and intangible property other than real property.

Explicit Taxes

Direct taxes imposed directly by a government that are easily quantifiable.

Implicit Taxes

Indirect taxes resulting from reduced before-tax rates of return produced by tax-favored or tax-advantaged assets.

Discriminant Function (DIF) System

An IRS computer program that assigns a score to each tax return representing the probability that tax liability on the return has been underreported.

Document Perfection Program

An IRS program that checks all returns for mathematical and tax calculation errors.

Information Matching Program

An IRS program that compares taxpayer returns against third-party data submitted by banks, employers, and brokerages (e.g., Forms W-2, 1099-INT, 1099-DIV).

Correspondence Examination

The most common and narrowest IRS audit, conducted entirely by mail for one or two tax return items.

Office Examination

The second most common IRS audit type, conducted at local IRS offices to address broader and more complex return issues.

Field Examination

The broadest, most complex, and least common IRS audit, conducted at the taxpayer's place of business or document location.

Statute of Limitations

The legal time frame within which a taxpayer can file an amended return or the IRS can assess a tax deficiency, generally ending $3\,\text{years}$ from the later of the filing date or original due date.

30-Day Letter

A formal letter sent by the IRS after an audit giving the taxpayer $30\,\text{days}$ to request an appeals conference or agree to proposed adjustments.

90-Day Letter

A formal notice of deficiency giving the taxpayer $90\,\text{days}$ to either pay the deficiency or file a petition in the U.S. Tax Court.

IRS Appeals/Litigation Process

The standard sequence of administrative appeals and court paths available to taxpayers when disputing IRS audit adjustments.

U.S. Tax Court

A national court of tax expert judges that hears tax disputes before the taxpayer pays the disputed tax liability.

U.S. District Court

A local trial court that hears tax cases after the taxpayer pays the deficiency and is denied a refund claim, and the only court offering a jury trial.

Federal Judicial System Structure

The hierarchy of trial courts (Tax Court, District Courts, Court of Federal Claims), Circuit Courts of Appeals, and the Supreme Court governing federal tax litigation.

Primary Authorities

Official sources of tax law generated by the legislative branch (IRC), judicial branch (court rulings), and executive branch (Treasury/IRS pronouncements).

Secondary Authorities

Unofficial tax materials that interpret and explain primary authorities, such as research services, articles, textbooks, and newsletters.

Stare Decisis

The judicial doctrine requiring courts to rule consistently with previous rulings and decisions of higher courts having appellate jurisdiction.

Golsen Rule

The rule establishing that the U.S. Tax Court will abide by rulings of the Circuit Court of Appeals that holds appellate jurisdiction over the taxpayer.

Treasury Regulations

The official interpretations of the Internal Revenue Code issued by the Treasury Department, holding the highest administrative weight.

Revenue Rulings

Administrative interpretations applying the Internal Revenue Code and Treasury Regulations to specific factual situations.

Revenue Procedures

Official statements detailing IRS practices and procedures involved in administering the tax law.

Private Letter Rulings

IRS administrative rulings applying tax law to a specific transaction and taxpayer upon request.

Timing Strategies

Tax planning methods based on accelerating tax deductions into earlier periods and deferring taxable income into later periods when tax rates are constant.

Income Shifting

A tax planning strategy that shifts income from high-tax-rate taxpayers or jurisdictions to low-tax-rate taxpayers or jurisdictions.

Conversion Strategy

A tax planning strategy centered on converting income from high-tax-rate activities into low-tax-rate or tax-exempt activities.

Constructive Receipt Doctrine

A judicial/tax doctrine requiring a cash-method taxpayer to recognize income when it is unconditionally available and controlled by the taxpayer.

Assignment of Income Doctrine

A judicial doctrine holding that income from services or property must be taxed to the taxpayer who earns it or owns the underlying property.

Business Purpose Doctrine

A judicial doctrine allowing the IRS to disallow business deductions for transactions lacking a economic or business rationale.

Step-Transaction Doctrine

A judicial doctrine allowing the IRS to collapse a series of intermediate related transactions into one single transaction to determine tax liability.

Gross Income

All income from whatever source derived, unless specifically excluded by law, received in any form including money, property, or services.

Adjusted Gross Income (AGI)

Gross income minus for AGI (above-the-line) deductions.

Taxable Income

The tax base for the individual income tax, calculated as Adjusted Gross Income (AGI) minus from AGI (below-the-line) deductions.

Realized Income

Income generated in a transaction with another party that results in a measurable change in property rights.

Exclusions

Realized income items that taxpayers are permanently permitted by law to exclude from gross income.

Deferrals

Realized income items included in gross income in subsequent tax years rather than the current year.

Ordinary Income

Income or loss taxed at standard statutory tax rates.

Capital Assets

All assets owned by a taxpayer except accounts receivable, inventory held for sale, and assets/depreciable property used in a trade or business.

Qualifying Child

A dependent meeting relationship, age (under $19$, or under $24$ if full-time student), residence (more than half the year), and support (child provides $\le 50\%$ of support) tests.

Qualifying Relative

A dependent who satisfies broad relationship or member-of-household tests, receives over $50\%$ of support from the taxpayer, and earns gross income under $\$5,300$.

Married Filing Jointly

Filing status for legally married taxpayers as of the last day of the year who combine income/deductions and share joint tax liability.

Qualifying Surviving Spouse

Filing status available to an unmarried surviving spouse for $2\,\text{years}$ after the spouse's death if maintaining a household for a dependent child.

Head of Household

Filing status for unmarried individuals who pay over half the cost of maintaining a household for more than half the year for a qualifying dependent person.

Economic Benefit

An item of value received by a taxpayer (such as cash, property, or debt relief) required to recognize gross income.

Realization Principle

The tax rule requiring a transaction with another party causing a measurable change in property rights before income is recognized.

Wherewithal to Pay

The concept that a transaction provides the taxpayer with the financial resources (cash) required to pay the resulting tax liability.

Return of Capital Principle

The rule allowing taxpayers to recover the cost of their tax basis in property tax-free when disposing of property.

Gain (Loss) on Sale Calculation

The formula used to calculate realized gain or loss: $\text{Sales Proceeds} - \text{Selling Expenses} = \text{Amount Realized} - \text{Tax Basis} = \text{Gain (Loss) on Sale}$.

Tax Benefit Rule

The rule requiring a refund of an expense deducted in a prior year to be included in current gross income to the extent the prior deduction reduced tax liability.

Annuity Exclusion Ratio

The calculation $\frac{\text{Original Investment}}{\text{Expected Value}}$ used to determine the non-taxable return of capital portion of an annuity payment.

Flow-Through Entity

A business structure (such as a partnership or S corporation) that passes income and deductions directly through to its owners' tax returns without entity-level taxation.

Imputed Interest

Calculated interest implied by tax law on below-market or interest-free loans based on Applicable Federal Rates (AFR).

Discharge of Indebtedness

Forgiveness of debt by a lender, which is generally taxable unless the taxpayer is insolvent.

For AGI Deductions

Above-the-line deductions subtracted directly from gross income to calculate Adjusted Gross Income (AGI).

From AGI Deductions

Below-the-line deductions subtracted from AGI to determine taxable income, including itemized deductions (or standard deduction) and QBI deduction.

Deduction Activity Types

The tax classification matrix categorizing business vs. investment activities and their corresponding for AGI or from AGI deduction treatments.

Excess Business Loss

The portion of aggregate business deductions exceeding aggregate business gross income plus $\$256,000$ ($\$512,000$ for MFJ), carried forward as a net operating loss.

Qualified Business Income (QBI) Deduction

A deduction from AGI generally equal to $20\%$ of qualified business income from an eligible pass-through entity or sole proprietorship.

Bunching Itemized Deductions

A tax timing strategy where itemized deductions are concentrated into a single tax year to exceed the standard deduction threshold and maximize tax savings.