Where to Find Deductions on Your Tax Return: Lines and Schedules

On a 2026 federal return, deductions sit in five places: the standard deduction on Line 12 of Form 1040, above-the-line deductions on Schedule 1, the new Schedule 1-A for tips, overtime, and car loan interest, itemized deductions on Schedule A (which replace the standard deduction on Line 12 if you choose them), and the qualified business income deduction on Line 13 of Form 1040. Knowing where to find each deduction on your tax return matters because a deduction you qualify for can easily go unclaimed if you don’t know which form or line it belongs on.

Line 12 of Form 1040: The Standard Deduction

The single largest deduction most filers take is the standard deduction, and it goes on Line 12 of Form 1040. You subtract a flat amount tied to your filing status; no receipts, no tracking. For the 2026 tax year:

Single: $16,100
Married filing jointly: $32,200
Head of household: $24,150
Married filing separately: $16,100

Two situations change the number on Line 12. If you or your spouse are 65 or older or legally blind, check the boxes on the first page of Form 1040 and add $1,650 per qualifying condition for 2026, or $2,050 if the person is also unmarried. If someone else can claim you as a dependent, your standard deduction is capped at the greater of $1,350 or $450 plus your earned income.² The statute treating this figure as the baseline of untaxed income is 26 USC 63.³

Schedule 1, Part II: Above-the-Line Deductions

Schedule 1 holds the deductions that come off your income before adjusted gross income is calculated. That timing matters because AGI drives eligibility for other tax breaks, student aid formulas, and Medicaid. Total these in Part II; the sum on Line 26 flows to Line 10 of Form 1040.⁴

You can take these whether or not you itemize. The most commonly used lines:

Line 11, educator expenses: up to $350 for unreimbursed classroom supplies in 2026, or $700 combined if both spouses filing jointly are educators.²
Line 13, HSA contributions: up to $4,400 for self-only coverage or $8,750 for family coverage in 2026, with an extra $1,000 if you’re 55 or older.⁵
Line 15, deductible part of self-employment tax: the employer-equivalent half.
Line 17, self-employed health insurance premiums.
Line 20, IRA contributions: up to $7,500 for 2026, plus a $1,100 catch-up at age 50. Coverage under an employer plan can reduce or eliminate this depending on income.
Line 21, student loan interest: up to $2,500, phasing out between $85,000 and $100,000 of modified AGI for single filers and between $175,000 and $205,000 for joint filers in 2026.²

Schedule 1-A: New Deductions Starting in 2026

Schedule 1-A is a brand-new form for the 2026 tax year, created by the IRS to handle deductions established by recent legislation. It’s where you claim deductions for tips, overtime pay, and car loan interest.⁶ Because it didn’t exist on prior returns, it’s easy to miss. If you earn tip income, regularly work overtime, or pay interest on a car loan, check the IRS instructions for Schedule 1-A to see which of these apply to your situation.

Schedule A: Itemized Deductions

Itemizing on Schedule A makes sense only when your qualifying expenses add up to more than the standard deduction for your filing status. The Line 17 total from Schedule A goes onto Line 12 of Form 1040 in place of the standard deduction.⁷ Four categories drive most itemized returns.

Medical and Dental Expenses

Lines 1 through 4 cover medical and dental costs, but only the portion exceeding 7.5% of your AGI is deductible.⁷ With an $80,000 AGI, the first $6,000 of qualified expenses is off the table. The line typically helps only in years of major medical events.

State and Local Taxes

SALT deductions run on Lines 5a through 5e. You can deduct either state income taxes or general sales taxes, plus property taxes and personal property taxes. For 2026, the total is capped at $40,400 ($20,200 if married filing separately). Once modified AGI passes $505,000 ($252,500 for separate filers), the cap phases down by 30 cents on the dollar, floor of $10,000.⁸

Mortgage Interest

Home mortgage interest goes on Line 8. Mortgages taken out after December 15, 2017 allow interest on up to $750,000 of principal ($375,000 if married filing separately). Older mortgages remain under the previous $1 million limit. The loan must have been used to buy, build, or substantially improve the home securing it; interest on home equity debt used for other purposes doesn’t qualify.⁹

Charitable Contributions

Cash gifts go on Line 11, non-cash gifts on Line 12, and prior-year carryovers on Line 13.⁷ Non-cash donations above $500 require Form 8283. Any single gift of $250 or more needs a written acknowledgment from the charity before you file; without it, the IRS can disallow the deduction even if the gift was real.¹⁰

Line 13 of Form 1040: Qualified Business Income

Owners of pass-through businesses (sole proprietorships, partnerships, S corporations) claim the qualified business income deduction on Line 13 of Form 1040. It lets you subtract up to 20% of net business income from your taxable total, and it’s been extended past its original 2025 expiration.¹¹¹²

For 2026, if your taxable income stays below $201,750 (single) or $403,500 (joint), you generally take the full 20% on the simplified Form 8995. Above those thresholds, wage-and-property limitations phase in and you use the longer Form 8995-A. Specified service businesses (law, medicine, consulting, and similar fields) lose the deduction entirely above $276,750 for single filers and $553,500 for joint filers.²

What Doesn’t Appear on the Return

The forms tell the IRS what you’re claiming. They don’t prove it. Keep receipts, bank statements, and any required acknowledgment letters before you file, because the IRS can add a 20% accuracy-related penalty on any underpayment traced to a deduction it disallows.¹³ The default retention period is three years from filing or two years from paying the tax, whichever is later, with longer holds for underreported income, worthless-securities claims, and property you still own.¹⁴

1
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
2
Internal Revenue Service. Revenue Procedure 2025-32
3
Office of the Law Revision Counsel. 26 USC 63 – Taxable Income Defined
4
Office of the Law Revision Counsel. 26 USC 62 – Adjusted Gross Income Defined
5
Internal Revenue Service. Revenue Procedure 2025-19
6
Internal Revenue Service. Schedule 1-A, Additional Deductions: What to Know About the New Form
7
Internal Revenue Service. Schedule A (Form 1040) – Itemized Deductions
8
Office of the Law Revision Counsel. 26 USC 164 – Taxes
9
Internal Revenue Service. Publication 936, Home Mortgage Interest Deduction
10
Internal Revenue Service. Charitable Contributions: Written Acknowledgments
11
Internal Revenue Service. Qualified Business Income Deduction
12
Office of the Law Revision Counsel. 26 US Code 199A – Qualified Business Income
13
Internal Revenue Service. Accuracy-Related Penalty
14
Internal Revenue Service. How Long Should I Keep Records