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Introduction to U.S. Individual Taxation Deductions and Credits I

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Introduction to U.S. Individual Taxation Deductions and Credits I

In the U.S. individual income tax system, taxpayers can optimize their tax liabilities through statutory deductions and tax credits. The deduction mechanisms are categorized into two types: "For AGI deductions," which are subtracted from gross income to calculate Adjusted Gross Income (AGI); and "From AGI deductions," which are subtracted from AGI to determine taxable income, requiring taxpayers to choose between the standard deduction and itemized deductions.  

This article will briefly introduce "For AGI deductions" (including educator expenses, IRAs, student loan interest, etc.) and "From AGI deductions" (application conditions and limitations for the standard deduction and deductible items in itemized deductions).

  1. Educator Expenses

    An eligible educator is a kindergarten through grade 12 teacher, instructor, counselor, principal, or aide in a school for at least 900 hours during a school year.

    (1)
    Deduction Limitation

    If you are an eligible educator, you can deduct up to $300 of qualified expenses you paid.

    If you and your spouse are filing jointly and both of you are eligible educators, the maximum deduction is $600. Neither spouse can deduct more than $300 of his or her qualified expenses.

    (2)
    Qualified Expenses

    (a) Qualified expenses include ordinary and necessary expenses paid in connection with books, supplies, equipment (including computer equipment, software, and services), and other materials used in the classroom. An ordinary expense is one that is common and accepted in your educational field. A necessary expense is one that is helpful and appropriate for your profession as an educator. An expense does not have to be required to be considered necessary.

    (b) The cost of professional development is deductible.

    (c) Qualified expenses do not include expenses for home schooling or for nonathletic supplies for courses in health or physical education.

  2. Individual Retirement Accounts (IRA)

    The annual maximum contribution to an Individual Retirement Account (IRA) is determined by marital status, age, and earned income, with identical limits for 2024 and 2025. For unmarried taxpayers under age 50, the maximum contribution is $7,000; for those aged 50 or older, the limit increases to $8,000. Married couples filing jointly face a combined limit of $14,000 (if both spouses are under age 50) or $16,000 (if at least one spouse is 50 or older).

    Regardless of these statutory caps, the actual contribution cannot exceed the taxpayer’s earned income—defined as salary, wages, commissions, bonuses, and self-employment income. There are three different types of IRAs, including deductible traditional IRA, Roth IRA and nondeductible traditional IRA.

    (1)
    Deductible traditional IRA

    A taxpayer's deduction for a traditional IRA contribution is limited if the taxpayer or spouse participates in an employer-sponsored plan. The allowed deductible contribution phases out proportionately within the following ranges:

    (a) AGI Phase-out of Unmarried is $77,000 – $87,000 (2024) and $79,000 – $89,000 (2025)
    (b) AGI Phase-out of Married filing jointly is $123,000 – $143,000 (2024) and $126,000 – $146,000 (2025)

    If a married taxpayer is not an active participant in an employer's retirement plan, but the spouse is, the deduction for the spouse who is not an active participant is phased out based on the following AGI limitations:

    (a) AGI Phase-out of Married filing jointly is $230,000 – $240,000 (2024) and $236,000 – $246,000 (2025)
    (b) AGI Phase-out of Married filing separately is $0 – $10,000 (each spouse is subject to this limitation—both the participant and the nonparticipant)

    (2)
    Roth IRA

    The ability to contribute to a Roth IRA is constrained by modified adjusted gross income (MAGI) phase - out ranges, which differ based on filing status. In 2024, unmarried taxpayers encounter a phase - out between $146,000 and $161,000. For married couples filing jointly, the phase - out range is $230,000–$240,000 in 2024, and this range will increase to $236,000–$246,000 in 2025. Married taxpayers who file separately have a phase - out range of $0–$10,000. It is worth noting that the contribution limits remain the same, irrespective of whether taxpayers are active participants in employer-sponsored retirement plans, such as SEP or SIMPLE IRAs.

    Unlike traditional IRAs, Roth IRAs are not subject to the required minimum distribution (RMD) rules during the lifetime of the account owner. Qualified distributions from a Roth IRA have two prerequisites: the distribution must take place at least five years after the taxpayer’s first contribution to a Roth IRA, and it must be made under one of the following circumstances:

    (a) after the taxpayer reaches the age of 59½;
    (b) or to a beneficiary after the taxpayer's death;
    (c) or when the taxpayer is disabled;
    (d) or for a first - time homebuyer to purchase a principal residence..

    Moreover, rollovers from traditional IRAs to Roth IRAs (known as Roth conversions) are permitted, but these transactions are subject to specific tax treatment.

    (3)
    Nondeductible traditional IRA

    If a taxpayer's deduction for a contribution to a traditional IRA is limited, a nondeductible traditional IRA contribution can be made instead.

    For those who reach age 72 after December 31, 2022, minimum distributions are required to be taken by April 1 of the year following the year in which the taxpayer reaches age 73.

  3. Student Loan Interest Expense

    The adjustment for education loan interest is limited to $2,500. It is phased out for AGI between:

    (1) Single: $80,000 – $95,000 (2024); $85,000 - $100,000 (2025) and
    (2) Married: $165,000 – $195,000 (2024); $170,000 - $200,000 (2025)

    The taxpayer must be legally obligated to pay the loan (e.g., interest paid by a parent on a child's student loan will not qualify as an allowable adjustment). Interest is only deductible on loans incurred by a taxpayer solely to pay for qualified education expenses (e.g., general loans such as home equity line of credit would not qualify).

  4. Health Savings Accounts

    Health savings accounts (HSAs) enable workers with high-deductible health insurance to make pre-tax contributions to cover health care costs.

    Any amount paid or distributed out of an HSA that is used exclusively to pay the qualified medical expense of any account beneficiary is not includable in gross income. Distributions not used to pay qualified medical expenses are includable in gross income and subject to a 20% penalty.

    (1)
    Pretax contribution limits (2025)

    Self is $4,300 and Family is $8,550 in 2025;
    Add $1,000 for taxpayer's age 55+

    (2)
    High-deductible plan

    A high-deductible health plan (HDHP) is a plan that has a minimum annual deductible (indexed for inflation) of $1,650 for Self and $ $3,300 for family in 2025.

    (3)
    Out-of-pocket limitation

    Out-of-pocket expenses include deductibles, co-payments, and other amounts (other than premiums) that must be paid for plan benefits. Maximum Out-of-Pocket Expenses for self is $8,300 and or family is $16,600 in 2025.

  5. Moving Expenses

    Moving expenses can be deducted by active-duty members of the Armed Forces of the U.S., e.g. travel and lodging, transporting household goods.

  6. Self-Employment Tax (50% Deductible)

    Self-employed taxpayers with net business income are subject to Income tax and Social Security/Medicare tax (known as self-employment tax). Fifty percent of that is deducted to arrive at adjusted gross income.

  7. Self-Employed Health Insurance (100% Deductible)

    Self-employed individuals may deduct all of the medical insurance premiums paid for the taxpayer, spouse, and dependents, provided that the plan is set up in the name of the self-employed individual or the individual's business.

  8. Simplified Employee Pension (SEP)

    A self-employed taxpayer subject to the self-employment tax is generally allowed to set up a simplified employee pension (SEP). The maximum annual contribution amount is limited to the lesser of $69,000 in 2024 ($70,000 in 2025) or 25% of SEP net earnings (net earnings from self-employment).

    Net earnings are net earnings from self-employment (after the SEP deduction and one-half of the self-employment tax). It’s noted that 25% of self-employment after the SEP deduction is the mathematical equivalent of 20% (25% ÷ 125%) of self-employment income before the SEP deduction.

  9. Alimony

    For agreements executed or modified after December 31, 2018, no deduction is allowed to the spouse paying alimony, and the recipient spouse has no income from payments received.

    If any portion of the payment is fixed by the decree or agreement as being for the support of minor children (or is contingent on the child's status, such as reaching a certain age), such portion is not deductible by the spouse making payment and is not includable in income by the spouse receiving payment.

    If the divorce settlement provides for a lump-sum payment or property settlement by a spouse, that spouse gets no deduction for payments made, and the payments are not includable in the gross income of the spouse receiving the payment.

  10. Penalty on Early Withdrawal of Savings

    The penalty on early withdrawal of savings when funds in a certificate of deposit are withdrawn before maturity.

See also:
U.S. Individual Retirement Account (IRA) Introduction
U.S. Health Savings Account (HSA) Introduction
Introduction to Self-Employment Tax in U.S.
U.S. Tax Treatment of Alimony

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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