First, a scope note. During the 2026 filing season you file a tax year 2025 return, using the final 2025 Schedule A and instructions. The 2026 Schedule A is still an IRS draft ("Do not file draft forms"), so this guide flags 2026 rules separately. Always use the form and instructions for the year you are filing.
This guide covers eligibility, what changed, line-by-line entries, records, related forms, common errors, and how Schedule A differs from Schedule 1-A. Dollar amounts are US dollars, because they are US federal figures.
Key Takeaways
- Compare total itemized deductions with your standard deduction before you start Schedule A.
- The IRS instructions for your return year control limits, line numbers and attachments.
- Schedule A covers medical, taxes, interest, charity, casualty and theft, and a short "other" list.
- Do not mix Schedule 1-A with Schedule A; they are separate forms.
What Is Schedule A and Who Needs to File It?
What Schedule A does
Schedule A totals your itemized deductions. For 2025, the total on line 17 carries to Form 1040 or 1040-SR line 12e. The 2026 draft moves the total to line 18, still feeding line 12e. Confirm line numbers against the form for your filing year.
Who should consider itemizing
The IRS says your tax is usually lower if you take the larger of the itemized or standard deduction. Itemizing tends to help people with:
- Large mortgage interest
- Heavy state and local taxes
- Medical costs above 7.5% of AGI
- Substantial charitable gifts
- Losses from a federally declared disaster
If you take the standard deduction, you generally don't attach Schedule A. One exception: if you're married filing separately and your spouse itemizes, your standard deduction is zero, so you must itemize too.
What Schedule A does not cover
Several benefits sit elsewhere:
- Schedule 1 adjustments: deductible IRA contributions, student-loan interest, deductible HSA contributions
- Schedule 1-A: tips, overtime, qualifying car-loan interest and the enhanced senior deduction
- Credits and business expenses: these have their own forms
Don't claim the same item twice.
What Changed for 2026? Confirm the Correct Tax Year First
Standard deduction benchmarks
The threshold you must beat differs by year:
| Filing status | Tax year 2025 | Tax year 2026 |
|---|---|---|
| Single / MFS | $15,750 | $16,100 |
| Married filing jointly | $31,500 | $32,200 |
| Head of household | $23,625 | $24,150 |
These are base amounts, before age or blindness additions.
SALT cap
Under P.L. 119-21, the cap on state and local taxes is $40,000 for 2025 and $40,400 for 2026 ($20,000 and $20,200 if married filing separately). It shrinks by 30% of MAGI above $500,000 (2025) or $505,000 (2026), but never below $10,000 ($5,000 MFS).
Other 2026 changes
- Mortgage insurance: not deductible for 2025; reinstated permanently from 2026.
- Charity: itemizers deduct only gifts above 0.5% of the contribution base. Non-itemizers can deduct up to $1,000 ($2,000 joint) in cash gifts.
- Gambling: 2026 allows the lesser of 90% of losses or winnings; 2025 limits losses to winnings.
- Casualty: certain state-declared disasters are added.
- High-income limit: a 2/37 reduction applies to top-bracket filers.
Schedule A versus Schedule 1-A
Schedule 1-A is a separate schedule for the new tips, overtime, car-loan interest and senior deductions. Eligible itemizers claim those there, not on Schedule A.
Check the 2025 Schedule A instructions and Form 1040 instructions for each figure. Articles that blend 2025 and 2026 numbers are common, so verify.
2026 Schedule A Line-by-Line Instructions
Lines below follow the final 2025 form. The 2026 draft shifts numbering by one line after the taxes and interest sections, so confirm against the final 2026 form.
Lines 1-4: Medical and dental
You deduct qualifying unreimbursed expenses above 7.5% of AGI. Qualifying costs include insurance premiums paid with after-tax money, prescriptions, insulin and hospital care.
- Subtract insurance and employer reimbursements
- No deduction for costs paid from tax-free HSA, FSA or HRA funds
- Cosmetic and ordinary personal expenses don't qualify
- Medical mileage is 21 cents per mile for 2025; for 2026 it is 20.5 cents (January to June) and 23.5 cents (July to December)
Long-term care premiums count only up to age-based limits. For 2025 those limits are:
- $480 if 40 or younger
- $900 if 41–50
- $1,800 if 51–60
- $4,810 if 61–70
- $6,020 if 71 or older
Lines 5-7: Taxes paid
Choose state and local income taxes or general sales taxes, not both. The IRS Sales Tax Deduction Calculator can replace the worksheet.
Add real estate and personal property taxes, then apply the SALT cap above. Foreign income taxes generally give you a deduction or a credit, not both.
Lines 8-10: Interest paid
Home mortgage interest depends on when the debt began:
- After 15 December 2017: limit of $750,000 ($375,000 MFS)
- 13 October 1987 to 16 December 2017: $1 million ($500,000 MFS)
The debt must be secured by a qualified home, and home-equity proceeds must buy, build or substantially improve that home. Points are usually spread over the loan term, though qualifying main-home purchase points may be immediate. Refinancing points generally aren't.
Investment interest is limited to net investment income and needs Form 4952 unless every exception applies. Publication 936 covers the details.
Lines 11-14: Gifts to charity
Cash gifts to qualifying charities are generally limited to 60% of AGI; other gifts face 50%, 30% or 20% limits. Excess carries forward for 5 years.
- Gifts of $250 or more need a written acknowledgment
- Noncash gifts above $500 need Form 8283
- Appraisals are generally required above $5,000
Lines 15-17: Casualty, other deductions and total
Personal casualty losses generally need a federally declared disaster. You subtract $100 per event, then 10% of AGI, using Form 4684. Certain qualified disasters use a $500 reduction and skip the 10% rule.
"Other" deductions are limited to a short list:
- Allowable gambling losses
- Estate tax on income in respect of a decedent
- Certain bond-related deductions
- Claim-of-right repayments over $3,000
- Certain unrecovered pension investments
Add the right-hand column for lines 4 through 16, then carry the total to Form 1040 line 12e.
How to Decide, Complete, and Attach Schedule A
Gather your records
- Form 1098 and loan documents
- Property and state tax bills
- Medical receipts and reimbursement statements
- Charity acknowledgments and appraisals
- Disaster-loss evidence
- Investment-interest details and prior-year carryovers
Calculate and compare
Separate eligible from ineligible items, remove reimbursements, apply each floor or limit, and keep a worksheet for every line.
Here's a hypothetical for a married couple filing jointly for 2025: $14,000 in state and local taxes, $12,000 in mortgage interest and $9,000 in charity, for a total of $35,000. That beats the $31,500 standard deduction by $3,500, so itemizing wins. If charity were only $3,000, the $29,000 total falls short, so they'd take the standard deduction.
Transfer and attach
Carry the Schedule A total to Form 1040 line 12e. Attach Form 4684 for casualty losses, Form 8283 for large noncash gifts, and Form 4952 for investment interest.
Review before filing
- Confirm the tax year and filing status
- Check names and taxpayer identification numbers
- Re-add every line
- Match substantiation to each claim
- Coordinate with your spouse if filing separately
- Include all e-file attachments
- Store your records
Records, Common Mistakes, and When to Get Help
Records and substantiation
Bank statements alone may not prove a deduction. Keep supporting records such as:
- Receipts and written acknowledgments
- Appraisals and tax bills
- Lender documents
- Disaster evidence
The IRS retention guidance generally says 3 years, 6 years if you omit over 25% of gross income, and 7 years for worthless-security or bad-debt claims.
Common filing mistakes
- Mixing 2025 and 2026 rules
- Deducting reimbursed or pre-tax medical costs
- Using the wrong SALT or mortgage limit
- Confusing Schedule A with Schedule 1-A
- Deducting items that belong on another schedule
- Leaving out Form 4684, 8283 or 4952
- Skipping the standard deduction comparison
The IRS also disallows tax penalties, volunteered time and direct gifts to individuals.
When professional support may help
If you're in Australia with a US filing obligation, US federal rules and Australian tax treatment are not interchangeable. US citizens and resident aliens abroad generally follow the same filing rules as in the US and owe tax on worldwide income.
The US-Australia treaty generally preserves US taxation of citizens and residents, with credits for Australian tax in some cases. NRIs, OCIs and foreign investors may face similar cross-border questions.
VJM Global prepares Form 1040 and 1040-NR returns and supports tax compliance across Australia, the US and India if you want a second review.
Frequently Asked Questions
What is Schedule A on Form 1040?
Schedule A reports eligible itemized deductions. Its total replaces the standard deduction on Form 1040 when you choose to itemize.
Who should file Schedule A in 2026?
File it when allowable itemized deductions exceed your standard deduction. Filing status and tax year affect the comparison.
What deductions can be claimed on Schedule A?
Medical and dental expenses, taxes, interest, charitable gifts, casualty and theft losses, and a short list of other deductions. Check the current IRS instructions for limits and forms.
Do I need Schedule A if I take the standard deduction?
No. If your spouse itemizes while you file separately, you must itemize too. State returns may also have their own rules, so ask a professional.
What is the difference between Schedule A and Schedule 1-A?
Schedule A covers traditional itemized deductions. Schedule 1-A covers separate deductions for tips, overtime, car-loan interest and seniors.
Where does the Schedule A total go on Form 1040?
For 2025, line 17 goes to Form 1040 or 1040-SR line 12e. The 2026 draft uses line 18, also feeding line 12e. Confirm against the final form.
