What Itemized Deductions Mean in Plain English
Itemized deductions are specific, documented expenses the IRS allows you to subtract from your income instead of taking the standard deduction. Mortgage interest. State and local taxes. Charitable donations. Large medical expenses. If you have enough of these, your itemized total may exceed the standard deduction — and you’d take the larger number to minimize your tax bill.
The key word is “instead.” You can’t take both. You compare what you’d get from itemizing against the standard deduction ($14,600 for single, $29,200 for married filing jointly in 2024), and whichever is larger wins.
Before 2018, roughly 30% of taxpayers itemized. After the Tax Cuts and Jobs Act nearly doubled the standard deduction, that number fell below 10%. Most people no longer itemize — but for homeowners in high-tax states with large mortgages, itemizing can still pay off.
How Itemized Deductions Work
You claim itemized deductions on Schedule A of Form 1040. The main categories:
Mortgage interest: Deductible on up to $750,000 of mortgage debt (for loans originated after December 15, 2017). Your lender sends Form 1098 each January showing interest paid.
State and local taxes (SALT): Includes state income tax (or state sales tax, not both), plus local income taxes and property taxes. Capped at $10,000 total. This cap particularly stings taxpayers in high-tax states like California, New York, and New Jersey.
Charitable contributions: Cash and non-cash donations to qualifying organizations. Cash donations require a bank record or written acknowledgment from the organization for amounts over $250.
Medical and dental expenses: Only the amount exceeding 7.5% of your AGI. If your AGI is $80,000, you can only deduct medical expenses above $6,000. Most people don’t meet this threshold.
Casualty and theft losses: Only in federally declared disaster areas.
Why Itemized Deductions Matter to You
Itemizing makes sense when your qualifying expenses add up to more than the standard deduction. This most commonly happens when:
- You own a home with significant mortgage interest (and bought before 2018 rates made home prices explode)
- You live in a state with high income or property taxes
- You make large charitable contributions
- Some combination of all three
If your deductions are close to the standard deduction threshold, there are strategies to cross the line: “bunching” charitable contributions in alternate years (give two years’ worth in one year to exceed the threshold, then take the standard deduction the next year).
Documentation is non-negotiable. Keep your Form 1098 for mortgage interest, property tax statements, charitable acknowledgment letters, and medical expense receipts. The IRS can and does audit these.
Quick Example
Chris is married filing jointly (standard deduction: $29,200) and has these potential itemized deductions:
- Mortgage interest: $16,500
- State income tax: $7,200
- Property taxes: $4,800
- SALT total: $10,000 (capped)
- Charitable donations: $4,000
Total itemized: $30,500
Since $30,500 > $29,200, Chris should itemize — but by only $1,300. The additional tax savings at a 22% marginal rate: $286. Worth doing but not dramatic.
If Chris and their spouse weren’t homeowners, the itemized total would be $14,000 — well below the $29,200 standard deduction. Standard deduction wins easily.
Common Misconceptions
- Homeowners should always itemize. Not anymore. With the higher standard deduction, many homeowners — especially those with smaller mortgages or in low-tax states — take the standard deduction.
- You can deduct all your state taxes. The SALT deduction is capped at $10,000. If you live in a high-tax state and pay $15,000 in state income and property taxes, you can only deduct $10,000.
- You need to track every receipt throughout the year. You only need documentation for the deductions you actually claim. If you end up taking the standard deduction (which most people do), the receipts were collected for nothing. Use tax software to compare options before gathering all documentation.