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Introduction to U.S Individual Taxation Deductions and Credits II

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Introduction to U.S Individual Taxation Deductions and Credits II

In our first article, we explained how "adjustments" (e.g., educator expenses, retirement contributions) reduce gross income to calculate Adjusted Gross Income (AGI) – the first step in determining tax liability. Next, we will focus on the subsequent critical component in the calculation process: "deductions."

After establishing AGI, taxpayers may choose either the "standard deduction" (determined by filing status, with additional amounts for elderly/blind individuals) or "itemized deductions" (covering expenses like medical costs, state/local taxes, etc.). This article introduces both approaches and their key limitations. Understanding these mechanisms is essential for reducing taxable income and overall tax obligations.

  1. Standard Deduction

    (1)
    Non-itemizers receive a standard deduction, with the amount determined based upon filing status:

    (a) Single: $14,600 in 2024 ($15,000 in 2025)
    (b) HOH: $21,900 in 2024 ($22,500 in 2025)
    (c) MFJ or surviving spouse: $29,200 in 2024 ($30,000 in 2025)
    (d) MFS(only available if both taxpayer and spouse do not itemize): $14,600 in 2024 ($15,000 in 2025)

    (2)
    Additional deduction for the elderly and/or blind

    The U.S. tax system grants an additional standard deduction to taxpayers who are age 65 or older, blind, or both, with amounts structured by filing status (single or married), the number of qualified individuals (1 or 2), and tax year.

    For 2024, single filers with one qualified individual (either age 65 or blind) are eligible for $1,950 (which doubles to $3,900 if both age 65 and blind), while married joint filers receive $1,550 for one qualified spouse (age 65 or blind, increasing to $3,100 if both criteria are met); for two qualified individuals, married couples get $3,100 if each is age 65 or blind, or $6,200 if both are age 65 and blind.

    In 2025, these amounts increase: single filers receive $2,000 (or $4,000 for both conditions), married joint filers obtain $1,600 (or $3,200 for one spouse meeting both), and for two qualified individuals, $3,200 (each age 65 or blind) or $6,400 (both age 65 and blind).

    (3)
    Standard deduction—dependent of another

    For 2024, the standard deduction amount is the higher of $1,300 ($1,350 in 2025) or earned income plus $450 (remaining $450 in 2025).

    The dependent’s standard deduction remains constrained by the ordinary standard deduction for the tax year. Dependent taxpayers may claim the same supplementary standard deduction as other taxpayers for blindness and/or age 65-or-older status.

  2. Itemized Deductions

    Itemized deductions, known as "from AGI" deductions, are documented on Schedule A of an individual’s Form 1040. Married taxpayers filing separately must either both claim the standard deduction or both itemize—one spouse cannot take the standard deduction while the other itemizes.

    (1)
    Medical expenses

    Qualified medical expenses may be deducted only if they exceed insurance reimbursements and 7.5% of the taxpayer’s AGI. Eligible expenses include costs incurred for the taxpayer, spouse, or dependent who relies on them for more than half their support.

    Deductible medical costs encompass prescription medications, medical professional services, health insurance premiums deemed medically necessary, travel expenses to healthcare facilities (either actual costs or the IRS-standard mileage rate), and disability-related expenses—such as modifications to remove architectural barriers in residences to accommodate a disability.

    Non-deductible costs comprise elective surgeries, life insurance premiums, non-medical capital expenses, health club memberships, and personal care products like toothpaste, OTC drugs, or diaper services.

    (2)
    State, local, and foreign taxes

    Itemized tax deductions for state and local income taxes, property taxes, and sales taxes are capped at $10,000 in total. For tax years 2018 through 2025, foreign real property taxes—unless incurred in a trade or business—are non-deductible. Non-deductible taxes comprise federal taxes, estate/inheritance taxes, and taxes documented on Schedule C (business operations) or Schedule E (rental activities).

    (a)
    Real estate taxes (state and local taxes)

    State and local real property taxes may be deducted, with regulations governing: proration for sale or purchase years; taxes paid under protest (with subsequent recoveries included in taxable income); escrowed taxes (deductible only when paid to the taxing authority); foreign real property taxes (deductible only if related to a trade or business); land held for appreciation (taxpayers may choose to capitalize or deduct such taxes); and home office portions used for business (deductible via Schedule C).

    (b)
    Income taxes (state, local, and foreign)

    State, local, and foreign income taxes deductible include estimated taxes paid during the year; taxes withheld from paychecks; and prior - year tax assessments paid in the current year.

    (c)
    Personal property taxes (state and local)

    Deductible state, local, and foreign income taxes comprise annual estimated tax payments, income taxes withheld from wages, and current-year payments for prior-year tax assessments.

    (d)
    Sales tax election

    Taxpayers may opt to deduct either state and local income taxes or state and local general sales taxes. For those electing to deduct sales taxes, the allowable amount is calculated as either the total general sales taxes actually paid, or the amount specified in the IRS sales tax tables, plus sales taxes paid on motor vehicles, boats, and other IRS-designated items.

    (3)
    Interest expense

    (a)
    Home mortgage interest

    The maximum threshold for qualified indebtedness is $750,000 ($375,000 for married taxpayers filing separately). Deductions are allowed for "qualified residence interest" on a primary or secondary home. Mortgage interest attributable solely to business use may be deducted on Schedule C, while interest related to home rental activities is claimable on Schedule E.

    Qualified indebtedness is defined as debt used to acquire, construct, or substantially improve a principal or second residence, provided the debt is secured by the property.

    (b)
    Investment interest expense (Form 4952)

    The individual investment interest deduction is capped at net taxable investment income. Investment income comprises interest, ordinary dividends, rents, royalties, and net short/long-term capital gains—but excludes interest from tax-exempt bonds, with corresponding interest expenses on such bonds also nondeductible.

    Investment interest expense excludes amounts considered in calculating passive activity or rental real estate income/loss where taxpayers lack active participation. Any disallowed interest may be carried forward indefinitely until fully offset against net investment income in future tax years.

    (c)
    Personal interest - not deductible

    Personal interest comprises interest arising from personal bank loans, borrowed funds, life insurance policy loans, bank credit card balances, and acquisitions of personal property (e.g., automobiles, televisions). It also includes interest on federal/state/local tax underpayments and interest on home equity loans not used for home improvements.

    (d)
    Prepaid interest (allocate to proper period)

    Prepaid interest is required to be amortized over the loan term by the paying taxpayer, including for cash-basis taxpayers.

    (e)
    Educational loan interest (adjustment/not itemized deduction)

    Educational loan interest is treated as an adjustment in computing adjusted gross income (AGI). It functions as a deduction for AGI rather than an itemized deduction.


    (4)
    Charitable contributions

    Charitable contributions to eligible organizations are tax-deductible but require proper documentation (e.g., canceled checks, written receipts) for all cash gifts. Donors should avoid contributing property with a loss basis, as no tax benefit applies.

    Cash donations are limited to 60% of AGI; long-term capital gain property donations to public charities are capped at 30% of AGI (20% for private foundations). Excess contributions roll over for five years.

    Deductions apply only to contributions exceeding the value of benefits received. Organizations must provide a written statement for donations over $75 made in exchange for goods/services, outlining the deductible amount.

    Taxpayers may claim a charitable deduction for expenses incurred when hosting a full-time student (e.g., exchange student) in their home, provided the student is in 12th grade or younger. The deduction totals up to $50 per month for each full month (15+ days) the student resides in the home and attends school.

Reference:
https://www.irs.gov/pub/irspdf/f1040s1.pdf
https://www.irs.gov/pub/irs-pdf/p529.pdf
https://www.irs.gov/pub/irs-pdf/p590a.pdf
https://www.irs.gov/pub/irs-drop/n-23-75.pdf
https://www.irs.gov/pub/irs-pdf/i3903.pdf
https://www.irs.gov/pub/irs-pdf/p550.pdf

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