Quick Answer
Add up deductions from five main categories: medical expenses (over 7.5% of AGI), state/local taxes (up to $10,000), mortgage interest, charitable contributions, and miscellaneous deductions. For 2026, if your total exceeds $15,000 (single) or $30,000 (married filing jointly), itemizing saves money over the standard deduction.
Best Answer
Robert Kim, CPA
Taxpayers who want to understand if itemizing is worth it and how to calculate their total deductions
How to calculate your itemized deductions total
Itemized deductions are calculated by adding up eligible expenses from five main categories on Schedule A. The key is being systematic and thorough to ensure you don't miss valuable deductions.
The five categories of itemized deductions
1. Medical and dental expenses: Only amounts exceeding 7.5% of your adjusted gross income (AGI) count. If your AGI is $80,000, you can deduct medical expenses over $6,000.
2. State and local taxes (SALT): Limited to $10,000 total for state income taxes, local income taxes, and property taxes combined.
3. Home mortgage interest: Interest on up to $750,000 of mortgage debt for homes purchased after December 15, 2017 (or $1 million for earlier purchases).
4. Charitable contributions: Generally up to 60% of AGI for cash donations to qualified organizations.
5. Miscellaneous deductions: Limited items like casualty losses from federally declared disasters.
Step-by-step calculation process
Step 1: Gather your documentation
Step 2: Calculate each category
Let's use an example with $100,000 AGI:
Step 3: Add up your total
$1,500 + $8,500 + $12,000 + $3,200 = $25,200 total itemized deductions
Compare to standard deduction
For 2026, the standard deduction is $15,000 (single) or $30,000 (married filing jointly). In our example, a single filer with $25,200 in itemized deductions would save $2,040 in taxable income ($25,200 - $15,000) compared to taking the standard deduction.
Common mistakes to avoid
Double-counting: Don't include the same expense in multiple categories. State income taxes paid can't be counted as both SALT deduction and estimated tax payments.
Missing the AGI threshold: Medical expenses must exceed 7.5% of your AGI to be deductible. Many people include their entire medical bill instead of just the excess.
Forgetting documentation: Keep receipts and statements. The IRS may request proof of your deductions during an audit.
What you should do
1. Collect all relevant documents from the tax year
2. Use IRS Schedule A or tax software to calculate each category
3. Compare your total to the standard deduction for your filing status
4. Choose whichever option gives you the larger deduction
Use our return scanner to automatically identify potential itemized deductions you might have missed and get a precise calculation.
Key takeaway: Add up medical expenses (over 7.5% of AGI), SALT (up to $10,000), mortgage interest, and charitable contributions. If the total exceeds your standard deduction ($15,000 single, $30,000 married), itemizing saves money.
Key Takeaway: Itemize when your total deductions from medical expenses, SALT, mortgage interest, and charitable contributions exceed the standard deduction of $15,000 (single) or $30,000 (married filing jointly).
2026 standard deduction amounts vs. typical itemized deduction thresholds
| Filing Status | Standard Deduction | When to Consider Itemizing | Common Itemized Total Range |
|---|---|---|---|
| Single | $15,000 | Itemized total > $15,000 | $8,000 - $25,000 |
| Married Filing Jointly | $30,000 | Itemized total > $30,000 | $15,000 - $45,000 |
| Married Filing Separately | $15,000 | Itemized total > $15,000 | $8,000 - $25,000 |
| Head of Household | $22,500 | Itemized total > $22,500 | $12,000 - $35,000 |
More Perspectives
Robert Kim, CPA
Homeowners who typically benefit most from itemizing due to mortgage interest and property taxes
Why homeowners often benefit from itemizing
As a homeowner, you likely have two significant itemized deductions that renters don't: mortgage interest and property taxes. These alone often push your total above the standard deduction threshold.
Homeowner-specific calculation focus
Mortgage interest: This is usually your largest deduction. Check Form 1098 from your lender. For a $400,000 mortgage at 6.5%, you might pay $25,000+ in interest during the first few years.
Property taxes: Include all property taxes paid during the tax year, even if they were for the previous year. Remember the $10,000 SALT cap includes both property taxes AND state income taxes.
PMI and points: Private mortgage insurance premiums may be deductible (subject to AGI limits). Points paid to obtain your mortgage can often be deducted in the year paid for purchases, or amortized over the loan term for refinances.
Example homeowner calculation
Let's say you're married filing jointly with $120,000 AGI:
Total itemized deductions: $34,500
Standard deduction: $30,000
Benefit of itemizing: $4,500 extra deduction
At a 24% marginal tax rate, this saves you $1,080 in federal taxes.
Don't forget other homeowner deductions
The key is being thorough in your documentation and calculation to maximize your tax savings as a homeowner.
Key takeaway: Homeowners typically benefit from itemizing because mortgage interest and property taxes alone often exceed the standard deduction, especially in the early years of a mortgage.
Key Takeaway: Homeowners typically benefit from itemizing because mortgage interest and property taxes alone often exceed the standard deduction, especially in the early years of a mortgage.
Robert Kim, CPA
W-2 employees without significant deductions who want to verify if the standard deduction is truly better
When simple filers should consider itemizing
Even as a straightforward W-2 employee, you might have more deductions than you think. The key is doing a quick calculation to see if itemizing makes sense.
Simple checklist for W-2 employees
Medical expenses: Did you have surgery, dental work, or high prescription costs? Only amounts over 7.5% of your AGI count, but medical bills add up quickly.
State and local taxes: If you live in a high-tax state and paid significant state income taxes or property taxes (if you own), these might approach the $10,000 SALT limit.
Charitable giving: Regular church donations, charity contributions, and donated goods can add up. Keep receipts for everything over $250.
Simple example: Single filer, $60,000 AGI
Since $12,300 is less than the $15,000 standard deduction, you'd take the standard deduction and save time on paperwork.
When to do the full calculation
Consider itemizing if you:
The 5-minute test
Quickly estimate:
1. Medical bills over 7.5% of your income
2. State taxes + property taxes (capped at $10,000)
3. Charitable donations with receipts
4. Any other qualifying expenses
If the total is close to your standard deduction amount, it's worth doing the detailed calculation. Most simple filers find the standard deduction is better, but checking takes just a few minutes and could save hundreds in taxes.
Key takeaway: Most simple W-2 filers benefit from the standard deduction, but a quick calculation of medical expenses, state taxes, and charitable giving can reveal potential savings.
Key Takeaway: Most simple W-2 filers benefit from the standard deduction, but a quick calculation of medical expenses, state taxes, and charitable giving can reveal potential savings.
Sources
- IRS Schedule A Instructions — Official instructions for itemized deductions
- IRS Publication 501 — Standard deduction amounts and filing requirements
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Reviewed by Robert Kim, CPA on February 28, 2026
This content is for educational purposes only and is not a substitute for professional tax advice. Consult a qualified tax professional for advice specific to your situation.