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IRS Schedule A: Complete Guide to Itemized Deductions
Understand when itemizing beats the standard deduction and how to claim mortgage interest, charitable donations, state taxes, and medical expenses on.
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Understand when itemizing beats the standard deduction and how to claim mortgage interest, charitable donations, state taxes, and medical expenses on.
This guide is designed for first-pass understanding. Start with core terms, then apply the framework in your own account workflow.
Schedule A is the IRS form for itemized deductions; the detailed list of personal expenses that can reduce your taxable income beyond the standard deduction. From mortgage interest and charitable donations to state taxes and medical bills, Schedule A is where taxpayers who spend more than the standard deduction on deductible expenses can claim the difference. Since the Tax Cuts and Jobs Act nearly doubled the standard deduction in 2018, the number of itemizers has plummeted; but for those who qualify, the savings can be substantial.
Itemized deductions have been part of the U.S. tax code since the beginning of the modern income tax. The concept is straightforward: certain personal expenses are considered worthy of tax relief because they serve public policy goals. Charitable giving is encouraged, homeownership is subsidized through the mortgage interest deduction, and extraordinary medical costs receive relief.
For decades, a significant minority of taxpayers itemized. In the years before TCJA, roughly 30% of filers chose Schedule A over the standard deduction. This was especially common among homeowners in high-tax states, who could deduct substantial mortgage interest and state/local taxes.
The Tax Cuts and Jobs Act of 2017 transformed the landscape. By nearly doubling the standard deduction (from $6,350 to $12,000 for singles; $12,700 to $24,000 for married filing jointly) and simultaneously capping the state and local tax (SALT) deduction at $10,000, TCJA pushed the itemizing rate down to roughly 10% of filers. Millions of taxpayers who had itemized for decades suddenly found the standard deduction was a better deal.
The Pease limitation; a provision that reduced itemized deductions for high-income taxpayers; was eliminated by TCJA, providing some offset for wealthy filers who continued to itemize. This removal is also scheduled to expire after 2025 if TCJA sunsets.
You should file Schedule A when your total itemized deductions exceed your standard deduction. For the 2024 tax year, the standard deduction is:
Add $1,950 (single/HOH) or $1,550 (married) if you're 65 or older or blind.
Certain taxpayers must itemize regardless of amounts: married filing separately when your spouse itemizes (you cannot take the standard deduction if your spouse itemizes), nonresident aliens (in most cases), and dual-status aliens for the nonresident portion of the year.
Schedule A is filed with your Form 1040 by the regular April 15 deadline (or October 15 with an extension). There's no separate filing for Schedule A; it's always an attachment to the 1040.
You should itemize when your total deductible expenses exceed the standard deduction for your filing status ($14,600 for single filers, $29,200 for married filing jointly in 2024). This is most common for homeowners with large mortgages, taxpayers in high-tax states, and those who make significant charitable contributions.
The Tax Cuts and Jobs Act capped the state and local tax (SALT) deduction at $10,000 per return ($5,000 for married filing separately) starting in 2018. This limit covers the combined total of state income taxes (or sales taxes) and property taxes. The cap significantly reduced the benefit of itemizing for taxpayers in high-tax states like New York, California, and New Jersey.
Yes, but only the amount that exceeds 7.5% of your adjusted gross income (AGI). For example, if your AGI is $80,000, you can only deduct medical expenses above $6,000. Qualifying expenses include insurance premiums not paid with pre-tax dollars, prescriptions, doctor visits, dental work, and long-term care costs.
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Standard Deduction vs Itemizing: 2024–2026 Tax Guide
You can deduct unreimbursed medical and dental expenses that exceed 7.5% of your adjusted gross income (AGI). This is a high threshold; for someone with $100,000 AGI, only expenses above $7,500 are deductible. Qualifying expenses include doctor visits, surgeries, prescriptions, dental work, vision care, health insurance premiums (if not pre-tax), and medically necessary home modifications.
This section covers state and local taxes, specifically:
The combined total is capped at $10,000 ($5,000 for married filing separately) under TCJA. This cap is the single most controversial provision of TCJA for itemizers, particularly in high-tax states like New York, New Jersey, California, and Connecticut where property taxes and state income taxes routinely exceed $10,000 for middle-class homeowners.
Mortgage interest is the largest deduction here. You can deduct interest on up to $750,000 of mortgage debt ($375,000 married filing separately) for loans taken out after December 15, 2017. Loans from before that date are grandfathered at the old $1 million limit. Home equity loan interest is deductible only if the funds were used to buy, build, or substantially improve the home securing the loan. Investment interest (margin interest) is deductible up to net investment income.
Cash contributions are generally deductible up to 60% of AGI. Appreciated property (stocks held over a year) donated to public charities is deductible at fair market value up to 30% of AGI. You must have written acknowledgment for any single contribution of $250 or more. Non-cash contributions over $500 require Form 8283.
Under TCJA, casualty and theft loss deductions are limited to losses from federally declared disasters. The general personal casualty loss deduction was suspended from 2018-2025. Losses must exceed $100 per event plus 10% of AGI.
Most miscellaneous itemized deductions were eliminated by TCJA, including the deduction for unreimbursed employee expenses, tax preparation fees, and investment advisory fees. Remaining deductions include gambling losses (to the extent of winnings), unrecovered pension basis, and certain other narrow categories.
This article is educational and does not constitute tax advice. Consult a qualified tax professional for guidance specific to your situation.
Should you itemize or take the standard deduction? Compare 2024, 2025, and 2026 amounts, learn the SALT cap impact, and use our step-by-step process to.