Schedule A (Form 1040) is the IRS form for itemized deductions: medical expenses above 7.5% of AGI, state and local taxes (SALT) capped at $40,000 for 2025 and $40,400 for 2026, home mortgage interest, charitable gifts, and disaster losses. Itemize only if your Schedule A total beats your standard deduction: $15,750 single / $31,500 married filing jointly for 2025, rising to $16,100 / $32,200 for 2026. Two line-level changes matter this cycle: Line 8d (mortgage insurance premiums) reads "Reserved for future use" on the 2025 form but comes back for tax year 2026, and charitable gifts face a new 0.5%-of-AGI floor starting in 2026.
Key takeaways:
Official IRS resources: Schedule A (Form 1040) (PDF) · Instructions (PDF) · About Schedule A (Form 1040)
For most filers, Schedule A is a wasted hour: the standard deduction wins, you write it on Form 1040 Line 12e, and move on. For homeowners in high-tax states with mortgages, large charitable givers, or filers with major medical bills, itemizing can be worth thousands, and the One Big Beautiful Bill Act (OBBBA) of 2025 put many of them back in the itemizing column by quadrupling the SALT cap. The trick is knowing which group you're in before you start filling boxes.
Schedule A only matters if your itemized deductions exceed your standard deduction. If they don't, you take the standard deduction and skip Schedule A entirely.
| Filing Status | 2025 Standard Deduction | 2026 Standard Deduction |
|---|---|---|
| Single / Married Filing Separately | $15,750 | $16,100 |
| Married Filing Jointly / Qualifying Surviving Spouse | $31,500 | $32,200 |
| Head of Household | $23,625 | $24,150 |
Source: 2025 amounts set by the One Big Beautiful Bill Act (OBBBA, July 2025), printed in the margin of the 2025 Form 1040; 2026 amounts from Rev. Proc. 2025-32.
The simple rule: add up everything on your Schedule A. If the total exceeds your standard deduction, itemize. If not, take the standard deduction. Our standard vs itemized calculator runs the comparison in a minute.
A practical filter: if you don't own a home, don't live in a high-tax state, and don't give more than 5% of your income to charity, you almost certainly take the standard deduction. Itemizing pays mostly when you have a mortgage in a state with high property and income taxes.
Schedule A claims five categories of itemized deductions:
The total on Line 17 of Schedule A flows to Form 1040 Line 12e in place of the standard deduction.
| Category | Limit / Rule | Authority |
|---|---|---|
| Medical & dental (Lines 1-4) | Deduct only the amount above 7.5% of AGI | IRC §213(a); Pub 502 |
| SALT cap (Line 5e) | $40,000 for tax year 2025; $40,400 for 2026 ($20,000 / $20,200 MFS); reverts to $10,000 in 2030. MAGI above $500,000 phases the cap down 30¢ per dollar to a $10,000 floor. | IRC §164(b)(6) as amended by OBBBA 2025 |
| Mortgage interest cap (Lines 8a-8c) | Acquisition debt up to $750,000 ($375,000 MFS) post-Dec 15, 2017; $1,000,000 ($500,000 MFS) for grandfathered debt. Made permanent by OBBBA. | IRC §163(h)(3); Pub 936 |
| Mortgage insurance premiums (Line 8d) | Reinstated for premiums paid on or after January 1, 2026; phaseout between $100,000 and $110,000 AGI ($50,000–$55,000 MFS). NOT deductible on 2025 returns. | IRC §163(h) as amended by OBBBA |
| Charitable cash (Line 11) | 60% of AGI ceiling. Starting 2026, a new 0.5% AGI floor applies: only contributions above 0.5% of AGI are deductible. | IRC §170(b)(1)(G); IRC §170(p) |
| Charitable non-cash (Line 12) | 30% AGI ceiling for most non-cash; appraisal required if any single item exceeds $5,000. Form 8283 if total non-cash exceeds $500. | IRC §170(b)(1)(C); Pub 526 |
| Casualty & theft (Line 15) | Federally declared disasters only. Each loss reduced by $100, then total reduced by 10% of AGI. | IRC §165(h); Pub 547 |
The headline change: the SALT cap quadrupled, making itemizing newly worthwhile for homeowners in high-tax states, and the increase applied retroactively to tax year 2025. The countervailing changes hit in 2026: charitable donors lose 0.5% of AGI off the top of their deduction, and filers in the top 37% bracket have the value of each itemized dollar capped at 35 cents.
Medical and dental expenses are deductible only to the extent they exceed 7.5% of your AGI. The 7.5% floor has been permanent since the Further Consolidated Appropriations Act of 2020; earlier confusion about a 10% floor is no longer relevant.
Line 1: Total qualified medical and dental expenses paid in the year (out of pocket; not reimbursed by insurance, HSA, FSA, or HRA).
Line 2: AGI from Form 1040 Line 11b.
Line 3: 7.5% × Line 2. Line 3 is the AGI floor itself, not your deduction. On a $180,000 AGI, Line 3 is $13,500: the first $13,500 of medical spending produces no deduction.
Line 4: Line 1 minus Line 3. If Line 3 is more than Line 1, the result is negative and you enter -0- (the form's own instruction). A "negative" Line 4 simply means no medical deduction this year; it never reduces the other Schedule A categories.
Reference: IRC §213; IRS Publication 502.
The SALT section changed most dramatically. The cap was $10,000 from 2018-2024; the OBBBA raised it to $40,000 for 2025 and $40,400 for 2026, with roughly 1% annual increases through 2029, before reverting to $10,000 in 2030. The 2025 Schedule A prints the new cap directly in the Line 5e instruction.
Line 5a: State and local income taxes OR general sales taxes; you may include one, not both (check the box if you elect sales taxes). Sales tax is the better choice in states with no income tax (Florida, Texas, Tennessee, Washington, Wyoming, Alaska, South Dakota, Nevada). Use the IRS Sales Tax Deduction Calculator or the optional tables in the Schedule A instructions.
Line 5b: State and local real estate taxes (your property tax bill). Only amounts assessed at a uniform rate based on the property's value qualify. Special assessments for local improvements (sidewalks, sewers) typically don't.
Line 5c: State and local personal property taxes: taxes based on the value of personal property, often the value-based part of vehicle registration fees. Flat fees don't count.
Line 5d: Sum of 5a + 5b + 5c.
Line 5e: The smaller of Line 5d or the cap: $40,000 ($20,000 MFS) for 2025; $40,400 ($20,200 MFS) for 2026. The form flags you into the instructions if Form 1040 Line 11b exceeds $500,000 ($250,000 MFS), where the phaseout worksheet applies.
Line 6: Other taxes. The most common entry is foreign income tax, though most filers do better claiming the foreign tax credit on Schedule 3 Line 1 instead.
Line 7: Sum of Line 5e + Line 6. Total taxes deduction.
If your MAGI exceeds $500,000 ($250,000 MFS), the cap shrinks by 30 cents per dollar of excess, with a hard floor of $10,000. Three 2025 data points, married filing jointly:
| MAGI | Excess over $500,000 | Phasedown (30%) | SALT cap |
|---|---|---|---|
| $420,000 | $0 | $0 | $40,000 (full cap) |
| $550,000 | $50,000 | $15,000 | $25,000 |
| $700,000 | $200,000 | $60,000 → floored | $10,000 |
So a couple with $420,000 of AGI, $30,000 of SALT, and $20,000 of mortgage interest deducts the full $50,000: they're under the phaseout threshold and their SALT is under the cap. Both the cap and the $500,000 threshold rise about 1% annually through 2029.
Reference: IRC §164(b)(6) as amended by OBBBA 2025; Bipartisan Policy Center summary.
Mortgage interest is the largest itemized deduction for most homeowners. The rules below apply to qualified residence interest on your main home and one second home.
Line 8 checkbox: New on the 2025 form: if you didn't use all of your mortgage loan proceeds to buy, build, or improve your home, check the box above Line 8a and see the instructions; part of your interest may not be deductible.
Line 8a: Home mortgage interest and points reported to you on Form 1098 (the annual statement your lender sends).
Line 8b: Home mortgage interest NOT reported on Form 1098. The most common case: seller-financed mortgages where the lender is an individual. You must list the seller's name, identifying number, and address.
Line 8c: Points not reported on Form 1098. Points paid to obtain a mortgage are generally deductible over the life of the loan, but points paid on the purchase of your main home can sometimes be deducted in full in the year paid (Pub 936 details the requirements). Points paid on a refinance are spread over the life of the new loan unless used for home improvements.
Line 8e: Sum of 8a + 8b + 8c (plus 8d starting with the 2026 form).
Line 9: Investment interest expense (interest on loans used to buy taxable investments). Limited to net investment income; compute on Form 4952.
Line 10: Sum of Line 8e + Line 9. Total interest deduction.
Not for tax year 2025: Line 8d on the 2025 Schedule A literally reads "Reserved for future use," and premiums paid in 2025 are not deductible. Starting with tax year 2026, the OBBBA permanently restored the deduction for qualified mortgage insurance premiums paid on or after January 1, 2026, treated as home mortgage interest on Line 8d.
What qualifies from 2026 on:
The income phaseout is the old one, not indexed: the deduction shrinks by 10% for every $1,000 of AGI above $100,000, disappearing entirely at $110,000 ($50,000–$55,000 MFS, in $500 steps). A borrower paying $2,400 of PMI with $104,500 AGI in 2026 loses 50% of the deduction and claims $1,200.
Mortgage interest is deductible only on acquisition indebtedness, debt used to buy, build, or substantially improve your main home or second home, up to a cap:
OBBBA made the $750,000 cap permanent. Before OBBBA, the cap was scheduled to revert to $1,000,000 after 2025. If your loan exceeds the cap, only the interest attributable to the first $750,000 (or $1,000,000) of debt is deductible; Pub 936 walks through the computation, and our mortgage interest deduction calculator estimates it.
Interest on a home equity line of credit (HELOC) or home equity loan is deductible only if the loan proceeds were used to buy, build, or substantially improve the home that secures the loan. HELOCs used to pay off credit cards, fund a vacation, or buy a car are NOT deductible. This restriction has been in place since TCJA and was made permanent by OBBBA.
When you refinance, the new mortgage retains its acquisition-debt status up to the principal balance of the old loan at the time of refinancing. Any cash-out portion is subject to the same use-test as a HELOC: deductible only if used for home improvements.
Reference: IRC §163(h); IRS Publication 936.
Charitable contributions to qualified 501(c)(3) organizations are deductible, but starting tax year 2026, only the portion above 0.5% of AGI counts.
Line 11: Cash contributions (checks, credit-card charges, electronic transfers, payroll deductions). 60% of AGI ceiling.
Line 12: Non-cash contributions (clothing, household goods, appreciated stock, real estate, vehicles). 30% of AGI ceiling for most non-cash gifts; 20% for gifts of appreciated property to certain private foundations.
Line 13: Carryover from prior year. Contributions exceeding the AGI ceiling carry forward five years.
Line 14: Total of Lines 11 + 12 + 13.
OBBBA introduced a 0.5% AGI floor on itemized charitable contributions, effective tax year 2026. Mechanics:
Example. AGI $200,000, total charitable contributions $5,000. Floor = $200,000 × 0.5% = $1,000. Deductible portion = $5,000 − $1,000 = $4,000.
The 0.5% floor does NOT apply to tax year 2025 returns; contributions made in 2025 retain full deductibility, subject only to the AGI ceilings. Two related 2026 changes: non-itemizers get a new above-the-line charitable deduction of up to $1,000 ($2,000 MFJ), and top-bracket itemizers have each deduction dollar capped at 35 cents of tax value.
If you're 70½+ and direct an IRA distribution to a charity (a Qualified Charitable Distribution), the amount is excluded from gross income on Form 1040 Line 4b; it does NOT go on Schedule A. QCDs lower AGI directly and don't require itemizing. Up to $108,000 per person allowed for 2025.
Reference: IRC §170; IRS Publication 526; IRC §170(p) (0.5% floor under OBBBA 2025).
Since TCJA, personal casualty and theft losses on Schedule A are deductible only if the loss is attributable to a federally declared disaster. OBBBA made this restriction permanent.
What qualifies:
The computation:
Form 4684 (Casualties and Thefts) is required. Theft losses unrelated to a federally declared disaster are NOT deductible on Schedule A as a personal loss; they may still qualify as a business loss on Schedule C if the property was business-use.
Reference: IRC §165(h); IRS Publication 547.
Line 16 ("Other—from list in instructions") accepts a short list of items that survived TCJA's elimination of the 2%-floor miscellaneous deductions. You must list the type and amount:
Unreimbursed employee business expenses, tax prep fees, and investment advisory fees remain non-deductible (made permanent by OBBBA).
Sum Lines 4 + 7 + 10 + 14 + 15 + 16. The total flows to Form 1040 Line 12e in place of the standard deduction.
If Line 17 is less than your standard deduction, take the standard deduction instead. (Line 18 offers a checkbox to itemize anyway even when itemized is smaller; it's used mainly by MFS filers whose spouse itemizes and by some filers for state-return reasons.)
Patricia and Mike file jointly. They own a home in San Diego, give to their church, and had a moderate medical year. Their tax year 2025 numbers:
| Line | Item | Amount |
|---|---|---|
| 1 | Total medical expenses | $14,700 |
| 2 | AGI | $180,000 |
| 3 | 7.5% of AGI | $13,500 |
| 4 | Deductible medical | $1,200 |
| Line | Item | Amount |
|---|---|---|
| 5a | State income tax | $14,000 |
| 5b | Real estate taxes | $9,500 |
| 5c | Personal property taxes | $0 |
| 5d | Sum | $23,500 |
| 5e | Capped at SALT limit | $23,500 (under the $40,000 cap; full amount deducts) |
| 6 | Other taxes | $0 |
| 7 | Total taxes | $23,500 |
Under the old $10,000 SALT cap, Patricia and Mike would have lost $13,500 of this deduction. The OBBBA cap increase saved them roughly $3,000 in federal tax at their 22% bracket.
| Line | Item | Amount |
|---|---|---|
| 8a | Mortgage interest (Form 1098) | $11,800 |
| 8b–8c | Interest/points not on 1098 | $0 |
| 8d | Mortgage insurance premiums | $0 (reserved for 2025; deduction starts tax year 2026) |
| 9 | Investment interest | $0 |
| 10 | Total interest | $11,800 |
| Line | Item | Amount |
|---|---|---|
| 11 | Cash contributions | $4,200 |
| 12–13 | Non-cash + carryover | $0 |
| 14 | Total charitable | $4,200 |
For 2025, no 0.5% floor applies; the full $4,200 deducts.
$1,200 (medical) + $23,500 (SALT) + $11,800 (interest) + $4,200 (charity) = $40,700.
Compare to the 2025 MFJ standard deduction: $31,500.
Itemized $40,700 beats the standard deduction by $9,200. Patricia and Mike itemize, and the extra $9,200 of deductions saves roughly $2,024 in federal tax at their 22% bracket.
If Patricia and Mike move to Texas (no state income tax), Line 5a drops to roughly $1,200 (state sales tax via the optional table). Line 17 falls to $27,900, below the $31,500 standard deduction, so they take the standard deduction. The lesson: SALT is what makes itemizing pay for typical homeowners.
For tax year 2026, two OBBBA changes shift their math: PMI becomes deductible on Line 8d (if they pay it), and the 0.5% AGI charity floor trims $900 off their charitable deduction. Itemizing still wins against the $32,200 standard deduction, but donors near the line should consider bunching gifts.
Problem: Filling out Schedule A out of habit without comparing Line 17 to the standard deduction. Solution: Always run both numbers. Write your standard deduction ($31,500 MFJ for 2025) next to Schedule A Line 17 and compare before transferring anything to Form 1040 Line 12e.
Problem: Applying the old $10,000 cap on a 2025 or 2026 return, or assuming the $40,000 cap survives a $600,000 income. Solution: The Line 5e cap is $40,000 for 2025 and $40,400 for 2026, but it phases down 30¢ per dollar of MAGI above $500,000 to a $10,000 floor. Check both numbers before deciding whether itemizing still wins.
Problem: Counting elective cosmetic procedures, gym memberships, or wellness purchases in Line 1. Solution: Pub 502 has the specific list. If a procedure is purely elective (not deformity, congenital abnormality, or trauma), it doesn't qualify. When in doubt, get a doctor's letter establishing medical necessity.
Problem: Claiming a $500 gift on Line 11 with only the canceled check, no written acknowledgment. Solution: Keep every charity acknowledgment letter. Most charities send year-end statements automatically; if yours doesn't, request one before you file.
Problem: Entering 2025 mortgage insurance premiums on Line 8d because "OBBBA brought the deduction back." Solution: The 2025 Schedule A Line 8d is "Reserved for future use," and the IRS will disallow an entry there. Premiums qualify only when paid on or after January 1, 2026; watch for the amount in Form 1098 Box 5 on next year's statement.
Tracking the inputs is the hard part of Schedule A; most filers reach April with a folder of mortgage statements and a fuzzy memory of medical spending. Jupid's AI accountant categorizes every transaction from your connected bank accounts in real time at 95.9% accuracy: property tax separated from mortgage escrow, interest from principal and PMI, medical payments by provider, charitable gifts by payee. The rules engine is OBBBA-aware (the $40,000/$40,400 SALT caps, Line 8d timing, the 2026 charity floor), and you can ask "should I be itemizing this year?" in WhatsApp or iMessage and get an answer from your actual numbers.
| Item | Tax Year 2025 | Tax Year 2026 |
|---|---|---|
| Standard deduction (Single) | $15,750 | $16,100 |
| Standard deduction (MFJ) | $31,500 | $32,200 |
| Standard deduction (HoH) | $23,625 | $24,150 |
| SALT cap | $40,000 ($20,000 MFS) | $40,400 ($20,200 MFS) |
| Mortgage acquisition debt cap | $750,000 ($1M grandfathered) | $750,000 ($1M grandfathered) |
| Medical AGI floor | 7.5% | 7.5% |
| Medical mileage rate | 21¢/mile | 20.5¢/mile |
| Charity cash AGI ceiling | 60% | 60% |
| Charity AGI floor (NEW) | None | 0.5% |
| Mortgage insurance deduction (Line 8d) | Not available | Reinstated |
Schedule A is back in play for many homeowners after OBBBA. If you live in a high-tax state (California, New York, New Jersey, Connecticut, Massachusetts) with combined property and income taxes past $20,000 and you have a mortgage, itemizing is likely the right answer for tax years 2025 and 2026.
The key strategies:
Schedule A rewards filers who keep records, not filers who guess.
If you're using Claude, ChatGPT, or another AI agent to help fill out Schedule A (Form 1040), we've published an open-source skill that gives the agent exact line-by-line instructions, validation checks, ask-don't-guess prompts, and worked examples — the same logic Jupid uses internally.
→ jupid-tax/jupid-skills on GitHub — forms/schedule-a/
For Claude Code: cp -r jupid-skills/forms/schedule-a ~/.claude/skills/. For the Anthropic SDK, load SKILL.md into the system prompt and the references/ files on demand. For browser-automation runtimes, filing.md covers the e-file or paper-file workflow.
Disclaimer
This article provides general information about itemized deductions and should not be considered tax advice. Tax laws change frequently — OBBBA 2025 alone changed five Schedule A rules — and individual circumstances vary significantly. 2025 figures reflect OBBBA; 2026 figures are from Rev. Proc. 2025-32. For advice specific to your situation, consult with a qualified tax professional.
Tax Years: 2025 (returns filed in 2026) and 2026 Last Updated: July 7, 2026
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