Chapter 8: Individual Income Tax Computation and Tax Credits

Regular Income Tax Computation and Filing Status

Taxpayers determining their regular tax liability are dependent on two primary factors: - Filing Status: This includes Married filing jointly (MFJ), Qualifying widow or widower (Surviving spouse), Married filing separately (MFS), Head of household (HoH), and Single. - Progressive Tax Rates: These are computed using tax rate schedules or tax tables.
Tax brackets (marginal tax rates) for ordinary income include the following levels: $10\%$ , $12\%$ , $22\%$ , $24\%$ , $32\%$ , $35\%$ , and $37\%$ .
The Marriage Penalty vs. Benefit refers to the impact of filing status on total tax liability: - Marriage Penalty: Occurs most likely when both spouses receive income. - Marriage Benefit: Occurs most likely when only one spouse receives income.

Taxable Income and Preferential Rates

Exceptions to basic tax computation involve items taxed at preferential rates rather than ordinary income rates.
Long-term Capital Gains (Net Capital Gains): - Generally taxed at $0\%$ , $15\%$ , or $20\%$ , $28\%$ . - It is possible for a single gain to be split across two different tax rates.
Qualified Dividends: - Generally taxed at preferential rates of $0\%$ , $15\%$ , or $20\%$ . - A single dividend amount may also be subject to two different preferential rates depending on income levels.

Tax Computation Example: Courtney

Scenario: Courtney has a taxable income of $576,700$ , which includes $15,000$ of qualifying dividends.
Filing Status: Head of Household.
Computation Steps: - 1) Total Taxable Income: $576,700$ - 2) Preferentially Taxed Income: $15,000$ - 3) Income Taxed at Ordinary Rates: $561,700$ ( $576,700$ total minus $15,000$ preferential) - 4) Tax on Ordinary Income: Calculated as $55,484 + (561,700 - 250,500) \times 35\% = 164,404$ . - 5) Tax on Preferentially Taxed Income: $2,750$ . This is split into two brackets: - $10,000$ falls in the $20\%$ bracket ( $576,700$ income minus $566,700$ HoH threshold for $20\%$ preferential rate). - $5,000$ falls in the $15\%$ bracket (HoH $15\%$ bracket ranges from $64,750$ to $566,700$ ). - Calculation: $(5,000 \times 15\%) + (10,000 \times 20\%) = 2,750$ . - Total Tax Liability: $164,404 + 2,750 = 167,154$ .

The Kiddie Tax for Unearned Income

Net unearned income of children is taxed at the parents’ marginal rate.
Net unearned income is defined as unearned income in excess of a threshold of $2,700$ .
Applicability of the Kiddie Tax: - The child is under age 18 at the end of the year. - The child is 18 at year-end, but earned income did not exceed half of the child’s support. - The child is between ages 18 and 24 (at year-end), is a full-time student, and earned income did not exceed half of the child’s support (excluding scholarships).
Example: Deron (son of Courtney, who has a $24\%$ marginal rate). - Deron received $5,600$ in IBM bond interest and $2,100$ in interest from a money market account. - Total Gross Income/AGI: $7,700$ . - Standard Deduction: $1,350$ (minimum for a dependent with no earned income). - Taxable Income: $7,700 - 1,350 = 6,350$ . - Net Unearned Income Calculation: Lesser of taxable income ( $6,350$ ) or Gross Unearned Income minus $2,700$ ( $7,700 - 2,700 = 5,000$ ). Net Unearned Income is $5,000$ . - Kiddie Tax Amount: $5,000 \times 24\% = 1,200$ . - Tax on remaining income at Deron's rate: $6,350 - 5,000 = 1,350$ . Tax is $1,350 \times 10\% = 135$ . - Total Tax Liability for Deron: $1,200 + 135 = 1,335$ .

Net Investment Income Tax (NIIT)

A tax of $3.8\%$ is imposed on the lesser of: - Net investment income (e.g., interest, dividends, annuities, royalties, rents, passive activity income, net gains from property disposal, minus allowed deductions). - The excess of Modified AGI (MAGI) over a threshold of: - $250,000$ for Married Filing Jointly. - $125,000$ for Married Filing Separately. - $200,000$ for all other filing statuses.

Alternative Minimum Tax (AMT)

AMT is meant to ensure that taxpayers with large capital gains or specific tax benefits still pay a minimum level of tax based on a more inclusive tax base.
AMT Computation Formula: - Regular Taxable Income - Plus: Standard Deduction (if used in regular tax calculation) - Plus or Minus: Other Adjustments (technically شامل both preference items and adjustments) - Equals: Alternative Minimum Taxable Income (AMTI) - Minus: AMT Exemption Amount - Equals: Tax Base for AMT - Times: AMT Rate - Equals: Tentative Minimum Tax - Minus: Regular Tax - Equals: Alternative Minimum Tax
Common AMT Adjustments (Added back to income): - Tax-exempt interest from private activity bonds. - State and local income taxes (limited to $10,000$ globally). - Real property taxes (limited to $10,000$ globally).
2025 AMT Exemptions: - Married Filing Jointly: Exemption of $137,000$ ; Phase-out begins at $1,252,700$ AMTI; Complete phase-out at $1,800,700$ . - Married Filing Separately: Exemption of $68,500$ ; Phase-out begins at $626,350$ AMTI; Complete phase-out at $900,350$ . - Head of Household and Single: Exemption of $88,100$ ; Phase-out begins at $626,350$ AMTI; Complete phase-out at $978,750$ . - Phase-out Rate: The exemption is reduced by $0.25$ (25 cents) for every dollar the AMTI exceeds the phase-out threshold.

Employment and Self-Employment Taxes

Employee FICA Taxes: - Social Security: $6.2\%$ rate on compensation up to a limit of $176,100$ . - Medicare: $1.45\%$ rate. - Additional Medicare: $0.9\%$ rate on wages exceeding $200,000$ ( $125,000$ MFS; $250,000$ MFJ). - Employer Responsibility: Matches the Social Security ( $6.2\%$ ) and Medicare ( $1.45\%$ ) portions and withholds the employee share.
Self-Employment Taxes: - Self-employed individuals pay both the employer and employee share of FICA (roughly $15.3\%$ combined). - Tax Base: Net earnings from self-employment = $Net Schedule C Income \times 0.9235$ . - Exemption: No self-employment tax if net earnings are less than $400$ . - Interaction with Wages: If a taxpayer has both wages and self-employment income, wages use up the Social Security wage limit ( $176,100$ ) first.
Example: Courtney with $100,000$ wages and $180,000$ business income. - 1) Remaining Social Security Limit: $176,100 - 100,000 = 76,100$ . - 2) Net S-E Earnings: $180,000 \times 92.35\% = 166,230$ . - 3) S-E Social Security Tax: $76,100 \text{ (capped portion)} \times 12.4\% = 9,436$ . - 4) S-E Medicare Tax: $166,230 \times 2.9\% = 4,821$ . - 5) Additional Medicare Tax: Courtney's total compensation for this calculation is $100,000 + 166,230 = 266,230$ . Excess over $200,000$ is $66,230$ . - Tax amount: $66,230 \times 0.9\% = 596$ . - Total Self-Employment and Add. Medicare Tax: $9,436 + 4,821 + 596 = 14,853$ .

Employee versus Independent Contractor Status

The primary determining factor is "Control": who controls how, when, and where the work is performed.
Tax Implications: - Difference in the amount of FICA vs. self-employment tax paid. - Deductibility of expenses: Employee expenses are rarely deductible (mostly from AGI limitations), while independent contractors deduct business expenses for AGI and the employer portion of self-employment tax.

Nonrefundable and Refundable Personal Tax Credits

Categories of Tax Credits: - Nonrefundable Personal: Reduce tax to zero but no further. - Refundable Personal: Excess is refunded to the taxpayer. - Business: Promote specific behaviors; involve carryback (1 year) and carryforward (20 years) if they exceed tax.
Child Tax Credit: - $2,200$ per qualifying child under age 17. Partially refundable. - $500$ per other qualifying dependent. Not refundable.
Child and Dependent Care Credit: - Applies to care for dependents under age 13 or disabled dependents. - Maximum expenditures: $3,000$ for one person; $6,000$ for two or more. - Percentage ranges: Between $35\%$ (AGI $0-15,000$ ) and $20\%$ (as AGI increases).
American Opportunity Tax Credit (AOTC): - For the first four years of postsecondary education. - Credit: $100\%$ of first $2,000$ of expenses + $25\%$ of next $2,000$ (Max credit: $2,500$ ). - Applied per student (taxpayer, spouse, or dependents). - $40\%$ of the credit is refundable. - Example: Courtney pays $2,300$ for Ellen. Max credit before phase-out: $(2,000 \times 100\%) + (300 \times 25\%) = 2,075$ . - Phase-out example: For MFJ with $162,000$ AGI ( $160,000$ threshold), the credit is reduced by a percentage calculated as $(162,000 - 160,000) / 20,000 = 10\%$ . After-phase-out credit: $2,075 - 208 = 1,867$ .
Lifetime Learning Credit: - For eligible tuition (any course, grad school, continuing ed) to improve job skills. - Credit: $20\%$ of up to $10,000$ expenses (Max credit: $2,000$ ). - Applied per taxpayer (MFJ return is one taxpayer).
Earned Income Credit (EIC): - A negative income tax for low-income workers with earned income. - Requires at least one child or meeting age requirements (not a dependent of another). - Maximum amounts (2025): $0$ children ( $684$ ), $1$ child ( $4,328$ ), $2$ children ( $7,152$ ), $3+$ children ( $8,046$ ).

Tax Prepayments, Filing Requirements, and Penalties

Prepayments: - Withholding is treated as made equally throughout the year. - Estimated Tax Payments: Due April 15, June 15, September 15, and January 15 (next year).
Safe-harbor Provisions to Avoid Underpayment Penalties: - Pay $90\%$ of current-year liability OR - Pay $100\%$ of previous-year liability ( $110\%$ if AGI > $150,000$ ).
Filing Requirements: - Based on gross income thresholds determined by filing status and age. - Due date: April 15 (extensible by 6 months for filing, but payment is still due April 15).
Penalties: - Late Filing: $5\%$ of tax owed per month (up to $25\%$ ) if not fraudulent; $15\%$ per month (up to $75\%$ ) if fraudulent. No penalty if no tax is owed. - Late Payment: $0.5\%$ of tax owed per month (or fraction of a month). - Combined Penalty Rule: If both apply, the late filing penalty is reduced by the amount of the late payment penalty ( $0.5\%\% per month).</p></li><li><p>Example Penalty: Courtney owes$ 4,000 and files one month late on May 1. - Late Payment: 4,000 \times 0.5\% = 20. - Late Filing: 4,000 \times 5\% = 200. - Combined penalty: 200 $(because the late filing penalty of$ 200 $already incorporates the logic and is limited to$ 5\%$$ total per month by rule).