What are common mistakes when itemized deductions optimization?

Not running the numbers both ways. Forgetting the new 0.5% AGI floor on charitable contributions. Missing the SALT income phaseout. Not taking the new above-the-line charitable deduction. Failing to track small deductible expenses.

What are the best tips for itemized deductions optimization?

Run a mid-year itemization check. Use a DAF as your charitable "savings account.". Donate appreciated stock, never cash, when possible. Combine bunching with Roth conversions. Consider timing of medical procedures.

Itemized deductions optimization Checklist — Step-by-Step Guide

Itemized deductions allow taxpayers to reduce taxable income by claiming specific qualifying expenses on Schedule A (Form 1040) instead of taking the flat standard deduction. For tax year 2026, several major changes enacted by the One Big Beautiful Bill Act (OBBBA) reshape the itemization landscape: the SALT cap quadrupled to $40,400, charitable contributions now require a 0.5% AGI floor, PMI is deductible again, and a new above-the-line charitable deduction exists for non-itemizers.

86 steps across 12 sections

1. Add Up All Potential Itemized Deductions

State/local taxes paid (income or sales + property) —- up to $40,400 cap
Mortgage interest on up to $750,000 of acquisition debt
Charitable contributions (cash and non-cash)
Medical/dental expenses exceeding 7.5% of AGI

2. Compare to Standard Deduction

Itemized total > Standard deduction? Itemize.
Itemized total < Standard deduction? Take the standard deduction.
Close to breakeven? Consider bunching strategies (see below) to push deductions into alternating years.

3. Check for Special Situations

Are you subject to AMT? Some itemized deductions are disallowed under AMT.
Are you in a high-income phaseout zone? The SALT deduction phases out above $505,000 MAGI in 2026.
Are you MFS? Both spouses must make the same choice (both itemize or both standard).
Do you have a state tax benefit from itemizing federally? Many states piggyback on federal itemization.

4. Implement Year-Round Tax Planning

Don't wait until April. Make charitable contributions, prepay property taxes, and time medical procedures strategically throughout the year.
Use bunching strategies to maximize multi-year tax benefit.

5. 1. Medical and Dental Expenses (Lines 1-4)

Doctor, dentist, surgeon, chiropractor, psychologist, psychiatrist fees
Hospital stays, nursing services, lab work, X-rays, MRI/CT scans
Prescription medications and insulin
Health insurance premiums (if not paid pre-tax through employer)
Medicare Part B and Part D premiums
Long-term care insurance premiums (subject to age-based limits)
Dental work: cleanings, fillings, crowns, bridges, implants, braces, dentures
Vision: eye exams, glasses, contacts, LASIK surgery
Hearing aids and batteries
Mental health treatment, addiction/substance abuse treatment

6. 2. State and Local Taxes --- SALT (Lines 5-7)

State income tax withheld from paychecks (W-2 Box 17)
State estimated tax payments made during the year
State income tax paid with prior-year return (e.g., balance due paid in April 2026 for 2025 return)
Local/city income taxes
Actual sales taxes paid (if you kept receipts) OR IRS sales tax tables
Best for residents of states with no income tax (TX, FL, WA, NV, SD, WY, AK, NH, TN)
Real estate property taxes on primary home
Real estate property taxes on second home
Personal property taxes (vehicle registration fees based on value, boat taxes)
Foreign taxes paid (but consider the Foreign Tax Credit as an alternative)

7. 3. Mortgage Interest (Lines 8-10)

Interest on mortgage debt up to $750,000 ($375,000 MFS) for homes purchased after Dec. 15, 2017
Interest on mortgage debt up to $1,000,000 ($500,000 MFS) for homes purchased on or before Dec. 15, 2017
Interest on primary residence AND one additional home (second home, vacation home)
Mortgage points paid at closing (generally deductible in year paid for purchase; amortized over loan term for refinance)
Refinance points (deductible ratably over loan life; remaining points deductible immediately if you refinance again)
Private Mortgage Insurance (PMI) —- newly deductible again for 2026 under OBBBA
Late payment charges on mortgage (if not for a specific service)
Home equity loan interest used for non-home-improvement purposes (post-TCJA)
Interest on loans used to buy tax-exempt securities
Closing costs (other than points)

8. 4. Charitable Contributions (Lines 11-14)

Charitable contributions now have a 0.5% AGI floor —- only donations exceeding 0.5% of AGI are deductible as itemized deductions
New above-the-line deduction of up to $1,000 ($2,000 MFJ) for cash donations, even if you take the standard deduction
Cash contributions: deductible up to 60% of AGI
Appreciated property: deductible up to 30% of AGI (at fair market value)
Contributions to private foundations: limited to 30% of AGI (cash) or 20% of AGI (property)
Cash/check/credit card donations to qualified 501(c)(3) organizations
Donations of clothing and household items (must be in "good used condition" or better)
Vehicle donations (special rules apply; Form 1098-C required for vehicles over $500)
Appreciated stock or securities (deduct FMV, avoid capital gains)
Real estate donations and conservation easements

9. 5. Casualty and Theft Losses (Line 15)

Each loss reduced by $100 per event
Total losses reduced by 10% of AGI
Must subtract any insurance reimbursement
Report on Form 4684

10. 6. Other Itemized Deductions (Line 16)

Gambling losses (deductible up to the amount of gambling winnings; Form W-2G)
Impairment-related work expenses for disabled individuals
Federal estate tax on income in respect of a decedent (IRD)
Unrecovered investment in an annuity (for a deceased annuitant)
Educator expenses exceeding $300 —- new for 2026, educators can deduct qualifying expenses as itemized deductions without limitation (in addition to the $300 above-the-line deduction)
Unreimbursed employee business expenses
Tax preparation fees
Investment management/advisory fees
Safe deposit box rental
Moving expenses (except active-duty military)

11. How Bunching Works --- Example

SALT: $15,000/year
Mortgage interest: $10,000/year
Charitable: $5,000/year
Total each year: $30,000 (below $32,200 standard deduction)
Result: Take standard deduction both years = $64,400 total deductions
Year 1 (bunch year): SALT $15,000 + Mortgage $10,000 + Charitable $10,000 = $35,000 —> Itemize
Year 2 (off year): SALT $15,000 + Mortgage $10,000 + Charitable $0 = $25,000 —> Standard deduction $32,200
Result: $35,000 + $32,200 = $67,200 total deductions
Savings: $2,800 extra deductions over two years

12. Bunching Vehicles and Techniques

Contribute 2-3 years of planned charitable gifts into a DAF in a single year
Take the full deduction in the contribution year
Distribute grants to your preferred charities over subsequent years
Assets in the DAF can be invested and grow tax-free
Minimum opening contribution varies ($5,000 at Fidelity Charitable, Schwab Charitable, Vanguard Charitable)
Donate highly appreciated securities directly to charity or DAF
Deduct the full fair market value (held >1 year)
Avoid capital gains tax on the appreciation
Double benefit: larger deduction + eliminated capital gains
Pay January property taxes in December of the prior year

Common Mistakes

Not running the numbers both ways
Forgetting the new 0.5% AGI floor on charitable contributions
Missing the SALT income phaseout
Not taking the new above-the-line charitable deduction
Failing to track small deductible expenses

Pro Tips

Run a mid-year itemization check
Use a DAF as your charitable "savings account."
Donate appreciated stock, never cash, when possible
Combine bunching with Roth conversions
Consider timing of medical procedures

Itemized deductions optimization