Top 10 US tax deductions for 2026 filers (ranked by average dollar saving)

Itemized vs standard deduction decision

The SALT cap increase from $10,000 to $40,000 (per OBBBA 2025) tips many more taxpayers into itemizing. A married couple in California with $8,000 property tax + $15,000 state income tax was capped at $10,000 pre-2026 - now they can deduct the full $23,000. Combined with $10,000 mortgage interest and $5,000 charity, that is $38,000 - well above the $30,000 standard.

Above-the-line deductions (HSA, IRA, student loan interest, etc.) are SEPARATE from Schedule A and reduce AGI directly. These work whether you itemize or take standard. They are the most tax-efficient deductions.

Top 5 deductions ranked

1. SALT (State and Local Tax) - $40,000 cap for 2026
- Property tax + state income tax (or sales tax) up to $40,000 per return
- Cap raised from $10,000 under OBBBA 2025 for most households
- For high-tax-state homeowners: avg saving $5,000-$10,000
- Married filing separately cap: $20,000

2. Mortgage Interest Deduction
- Interest on up to $750,000 mortgage (origination after Dec 2017) or $1M (older mortgages)
- Primary residence + one second home
- Home equity loan interest deductible ONLY if used for home improvement
- Average saving for homeowner: $3,000-$5,000

3. Charitable Contributions
- Cash to public charities: up to 60% AGI
- Long-term appreciated stock: up to 30% AGI (deducted at FMV)
- Bunching strategy: lump multiple years of giving into one year to exceed standard deduction
- Donor-advised fund: contribute now, distribute over years
- Average for itemizers: $4,000

4. Pre-Tax Retirement Contributions (above-the-line)
- 401(k)/403(b)/457(b): $23,500 deferral 2026 (+$7,500 if 50+, +$11,250 if 60-63)
- Solo 401(k) or SEP-IRA for self-employed: $70,000 cap
- Reduces AGI for both fed + state tax (in most states)
- At 32% bracket: $7,520 federal tax saved on max $23,500

5. Traditional IRA Contributions (above-the-line, with limits)
- $7,000 in 2026 ($8,000 if 50+)
- Fully deductible if not covered by employer plan
- Phase-out single covered by plan: $79,000 to $89,000
- Phase-out married jointly covered: $126,000 to $146,000

Ranks 6-10

6. HSA Contributions (above-the-line)
- $4,400 single HDHP, $8,750 family in 2026
- +$1,000 catch-up at 55
- Triple tax advantage: deduct now, grow tax-free, withdraw tax-free for medical
- Best stealth retirement account

7. Student Loan Interest (above-the-line)
- Up to $2,500 of interest paid in 2026
- Phase-out single: $80,000-$95,000 MAGI
- Phase-out married jointly: $165,000-$195,000
- Above phase-out: no deduction
- Saves $250-$600 in federal tax

8. Medical Expenses (Schedule A only)
- Unreimbursed medical expenses above 7.5% of AGI
- Includes long-term care insurance premiums (age-based caps)
- Mileage to medical: $0.22/mile in 2026
- Most useful for retirees with high medical costs

9. Self-Employed Deductions + QBI
- Schedule C: business expenses including home office, supplies, vehicle (mileage at $0.70/mile 2026), depreciation
- Section 199A QBI: 20% deduction on qualified business income for pass-through entities
- Self-employed health insurance: 100% deductible above-the-line
- Solo 401(k): up to $70,000 in 2026

10. Educator Expenses (above-the-line)
- K-12 teachers: up to $300 in classroom supplies (2026)
- Married couple both teachers: $600
- Includes books, software, athletic equipment for PE teachers
- Modest but easy to claim

Above-the-line vs Schedule A: which to use

Above-the-line deductions reduce AGI directly. They work whether you itemize or take standard. Apply them FIRST.

The big above-the-line deductions

• 401(k)/403(b)/457(b) elective deferrals
• HSA contributions
• Traditional IRA contributions (if eligible)
• Self-employed health insurance
• Self-employed retirement plans (Solo 401(k), SEP-IRA)
• Student loan interest
• Educator expenses
• Alimony (pre-2019 divorce decrees)
• Tax penalty for early CD withdrawal
• Moving expenses for active military

Schedule A deductions (itemized) come AFTER above-the-line, and only if your total exceeds the standard deduction.

The big Schedule A deductions

• SALT (capped at $40,000)
• Mortgage interest
• Charitable contributions
• Medical expenses over 7.5% AGI
• Casualty losses in federally declared disasters
• Investment interest (advanced)
• Gambling losses up to gambling winnings

Standard deduction is a flat amount; you cannot combine standard + Schedule A. You choose ONE.

Strategy: max above-the-line first (always benefits), then decide standard vs itemized.

Bunching: if total Schedule A is just below standard, lump charitable giving + medical procedures + property tax payments into one year to exceed standard. Next year, take standard. Repeat every 2 years.

Common mistakes

1. Taking standard deduction without checking Schedule A math. Most easy if SALT under $10K but now with $40K cap, more itemizers worthwhile.
2. Forgetting that HSA + 401(k) + IRA contributions stack with itemized or standard. They are ABOVE the line.
3. Missing the deadline for prior-year IRA/HSA contributions. April 15 of the FOLLOWING tax year (no extension).
4. Claiming mortgage interest on rental property as Schedule A. Goes on Schedule E (rental income), not Schedule A.
5. Itemizing without documentation. IRS requires receipts/canceled checks for charitable gifts $250+, doctor invoices, mortgage 1098.
6. Mis-using SALT for primary AND second home. The $40,000 cap applies per RETURN, not per property.
7. Claiming student loan interest while married filing separately. NOT allowed - must file jointly.
8. Missing QBI deduction for self-employed. 20% of business income up to taxable income thresholds.
9. Charity in non-public-charity. Private foundations have 30% cap; donor-advised fund still 60%.
10. Forgetting 401(k) match adds zero to your AGI but full deduction credit. Free money + tax savings.