Quick Answer
Schedule A is the IRS form for claiming itemized deductions like mortgage interest, state taxes (up to $10,000), charitable donations, and medical expenses over 7.5% of AGI. You fill it out section by section, total your deductions, and enter the amount on Form 1040 line 12a—but only if it exceeds your standard deduction ($30,000 for married couples in 2026).
Best Answer
Robert Kim, CPA
Best for taxpayers who need to understand Schedule A basics and step-by-step completion
What is Schedule A?
Schedule A (Form 1040) is the IRS form for claiming itemized deductions. According to IRS statistics, about 13.7% of taxpayers itemize, down from 30% before the Tax Cuts and Jobs Act increased standard deductions. Schedule A has five main sections where you report different types of deductible expenses.
Schedule A sections breakdown
Lines 1-4: Medical and Dental Expenses
Lines 5a-5f: State and Local Taxes (SALT)
Lines 6-7: Interest Expenses
Lines 8-19: Charitable Donations
Lines 20-21: Other Itemized Deductions
Step-by-step example: Completing Schedule A
Let's complete Schedule A for a married couple with $150,000 AGI:
Medical expenses:
State and local taxes:
Interest:
Charitable donations:
Schedule A calculation:
Key rules and limitations
Common Schedule A mistakes to avoid
What you should do
Before completing Schedule A, gather all relevant documents: mortgage interest statements (Form 1098), property tax bills, charitable donation receipts, and medical expense records. Calculate your total itemized deductions and compare to your standard deduction ($30,000 for married filing jointly in 2026). Only complete Schedule A if itemizing saves you money.
Key takeaway: Schedule A has five main sections for medical expenses, taxes, interest, charity, and other deductions. Complete it only if your total itemized deductions exceed your standard deduction, and keep detailed records for all claimed expenses.
Key Takeaway: Schedule A has five main sections for medical expenses, taxes, interest, charity, and other deductions. Complete it only if your total itemized deductions exceed your standard deduction, and keep detailed records for all claimed expenses.
Schedule A line-by-line completion guide
| Schedule A Section | Lines | What to Include | Common Limitations |
|---|---|---|---|
| Medical & Dental | 1-4 | Expenses over 7.5% of AGI | Must exceed 7.5% AGI threshold |
| State & Local Taxes | 5a-5f | Income taxes, property taxes | $10,000 cap ($5,000 MFS) |
| Interest | 6-7 | Mortgage interest, investment interest | $750,000 mortgage debt limit |
| Charitable | 8-19 | Cash and property donations | 60% of AGI limit (cash) |
| Other | 20-21 | Currently very limited | Most suspended 2018-2025 |
More Perspectives
Robert Kim, CPA
Best for homeowners focusing on mortgage interest and property tax sections
Schedule A for homeowners: Focus on lines 5-6
As a homeowner, your biggest Schedule A deductions typically come from mortgage interest (line 6) and property taxes (line 5b). These two items alone often exceed the standard deduction.
Line 6 - Home mortgage interest:
Enter the amount from Box 1 of Form 1098 (Mortgage Interest Statement) that your lender sends you. This includes:
Line 5b - Real estate taxes:
Enter property taxes paid to state and local governments. Include:
Important homeowner limitations:
Example homeowner Schedule A:
This exceeds the $30,000 standard deduction by $8,000, saving approximately $1,760 in taxes (22% bracket).
Key takeaway: Homeowners should focus on accurately reporting mortgage interest (line 6) and property taxes (line 5b), remembering that property taxes are subject to the $10,000 SALT cap.
Key Takeaway: Homeowners should focus on accurately reporting mortgage interest (line 6) and property taxes (line 5b), remembering that property taxes are subject to the $10,000 SALT cap.
Robert Kim, CPA
Best for first-time Schedule A filers who need basic guidance
Schedule A basics for first-time filers
If you're new to itemizing, Schedule A can seem overwhelming with its 28 lines. The good news: most simple filers only need to complete a few key sections.
Start with the big four categories:
1. Medical expenses (lines 1-4): Only worthwhile if you had major medical bills over 7.5% of your income
2. State and local taxes (lines 5a-5f): Include state income taxes and any property taxes
3. Mortgage interest (line 6): From your Form 1098
4. Charitable donations (lines 8-17): Cash donations to qualified charities
Simple approach:
Documentation you'll need:
Most common beginner mistake: Including expenses that aren't deductible, like:
Key takeaway: First-time Schedule A filers should focus on the four main categories: medical expenses over 7.5% of AGI, state/local taxes (capped at $10,000), mortgage interest, and charitable donations.
Key Takeaway: First-time Schedule A filers should focus on the four main categories: medical expenses over 7.5% of AGI, state/local taxes (capped at $10,000), mortgage interest, and charitable donations.
Sources
- IRS Schedule A Instructions — Itemized Deductions Instructions
- IRS Publication 17 — Your Federal Income Tax (For Individuals)
Related Questions
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.