Schedule A (Form 1040) Filing Checklist for Tax Year 2023
Overview and Eligibility
Schedule A (Form 1040) allows taxpayers to claim itemized deductions instead of the standard deduction. Itemize only if your total qualifying deductions exceed the standard deduction for your filing status. The 2023 standard deduction amounts are $13,850 for single filers and married filing separately, $27,700 for married filing jointly and qualifying surviving spouses, and $20,800 for heads of household.
Schedule A attaches to Form 1040 or Form 1040-SR. The total from line 17 is transferred to Form 1040 or Form 1040-SR, line 12. Calculate both itemized deductions and standard deduction amounts to determine which provides greater tax benefits.
Key Tax Cuts and Jobs Act Provisions
Several significant limitations continue for 2023. The state and local tax deduction is capped at $10,000 combined. Mortgage interest is limited to $750,000 of acquisition debt for loans after December 15, 2017, with grandfathered limits of $1,000,000 for earlier mortgages. Personal casualties and theft losses are restricted only to federally declared disasters. Miscellaneous itemized deductions subject to the 2 percent AGI floor remain suspended through 2025.
Ten-Step Filing Process
Step 1: Gather Documentation and Verify Eligibility
Collect all supporting documents before beginning. Required items include medical and dental receipts, Forms W-2 showing tax withholding, property tax statements, Form 1098 from mortgage lenders, charitable contribution acknowledgments, and casualty loss documentation if applicable.
Organize documents by deduction category. Verify Forms 1098 from all lenders. Confirm charitable organizations provided written acknowledgments for donations of $250 or more. Review property tax bills and state tax payment records.
Step 2: Calculate Medical and Dental Expenses
Enter total unreimbursed medical and dental expenses on line 1. Qualifying expenses include insurance premiums not paid through pre-tax payroll deductions, prescription medications and insulin, hospital and physician charges, dental care (including cleanings and orthodontics), vision care (including eyeglasses and contacts), hearing aids, nursing services, physical therapy, mental health treatment, and long-term care insurance, subject to age-based limits.
Include expenses for yourself, your spouse if filing jointly, and all claimed dependents. Include individuals you could have claimed as dependents, except they earned $4,700 or more or filed jointly. Include children of divorced or separated parents not claimed due to custody rules.
Enter adjusted gross income from Form 1040, line 11, on line 2. Multiply line 2 by 0.075 and enter on line 3. Subtract line 3 from line 1. Enter the result on line 4 if positive, or zero if line 3 equals or exceeds line 1. Only expenses exceeding 7.5 percent of AGI are deductible. Exclude reimbursed expenses. Cosmetic procedures are not deductible unless they are used to correct congenital abnormalities or injury damage.
Step 3: Calculate State and Local Taxes
Choose either state and local income taxes or general sales taxes on line 5a, not both. If claiming sales taxes, check the box. Income taxes include wage withholding from Forms W-2, estimated payments made during 2023, amounts paid with your 2022 state return in 2023, and mandatory state family leave contributions, including New Jersey Family Leave Insurance and California Paid Family Leave.
For sales taxes, use actual expenses with receipts or the optional IRS tables from the instructions. Tables provide amounts based on state, income, and family size. Add sales taxes on major purchases, such as vehicles or boats, to the table amounts.
Enter state and local real estate taxes on line 5b. Include taxes on primary residence, vacation homes, and other real property. Enter personal property taxes on line 5c. These must be ad valorem taxes based on value and charged annually.
Add lines 5a, 5b, and 5c. Enter the total on line 5d. On line 5e, enter the smaller of line 5d or $10,000, or $5,000 if married filing separately. This SALT cap applies to combined state and local taxes. Do not reduce deductions by expected refunds. If you received a state tax refund in 2023 for prior-year deductions, report it as income on Schedule 1, line 8z.
Step 4: Report Home Mortgage Interest and Points
Obtain Form 1098 from each lender. Enter home mortgage interest and points from Form 1098 on line 8a unless limitations apply. Interest is deductible on acquisition debt up to $750,000 for tax years beginning after December 15, 2017, or $375,000 if filing separately. Grandfathered limits of $1,000,000 or $500,000 if married filing separately apply to earlier mortgages.
The mortgage must secure your main home or second home. Acquisition debt must be used to buy, build, or substantially improve your qualified home. Enter mortgage interest, not on Form 1098, on line 8b. Include seller-financed interest with the recipient’s name, address, and taxpayer identification number.
Enter points, not Form 1098 on line 8c. Points on main home purchases are fully deductible if the requirements are met, including the loan used for the home purchase, points paid as a local business practice, and points calculated as a percentage of the principal. Refinancing points are deducted ratably over the life of the loan.
Leave line 8d blank. Add lines 8a through 8c. Enter the total on line 8e. Interest on a home equity loan is deductible only if the proceeds were used to buy, build, or substantially improve the secured home.
Step 5: Report Investment Interest Expense
Enter investment interest on line 9. This includes margin interest on investment purchases. Investment interest is limited to net investment income.
Complete and attach Form 4952 if claiming investment interest. Form 4952 calculates net investment income and allowable deduction. Exception: Skip Form 4952 if investment interest is $300 or less and all investment income is ordinary interest and dividends.
Step 6: Document Charitable Contributions
Enter cash contributions on line 11. Cash includes payments by cash, check, electronic transfer, credit card, debit card, and payroll deduction. Obtain written acknowledgment for single contributions of $250 or more showing the amount, date, and goods or services received.
Enter noncash contributions on line 12. Include donated property like clothing, household items, vehicles, securities, and real estate—valued at fair market value at donation time.
Complete Form 8283 if total noncash contributions exceed $500. Section A covers contributions of $5,000 or less and publicly traded securities. Section B covers items exceeding $5,000 per item or a similar group, which require a qualified appraisal, except for publicly traded securities.
Enter carryover contributions from prior years on line 13. Carryovers are allowed for five years after the original contribution.
Add lines 11, 12, and 13. Enter the total on line 14. Cash donations are limited to 60 percent of AGI generally, with 20, 30, or 50 percent limits depending on organization type and property. Excess contributions carry forward.
Step 7: Report Casualty and Theft Losses
For 2023, personal casualty and theft losses are deductible only if they result from federally declared disasters—complete Form 4684 to calculate the loss. Losses from federally declared disasters face $100 per casualty reduction and a 10 percent AGI threshold. For qualified disaster losses between February 26, 2021, and February 10, 2025, the reduction increases to $500, and the AGI threshold does not apply.
Enter the amount from Form 4684, line 18, on line 15. Attach Form 4684. Non-disaster losses are not deductible.
Step 8: Report Other Itemized Deductions
Line 16 allows specific other deductions. Most miscellaneous deductions subject to the 2 percent AGI floor are suspended through 2025, including unreimbursed employee expenses, tax preparation fees, and investment advisory fees.
Allowable deductions include gambling losses to the extent of gambling winnings, certain casualty losses of income-producing property, federal estate tax on income in respect of decedent, and amortizable bond premium on pre-October 23, 1986 bonds. List type and amount if applicable.
Step 9: Calculate Total Itemized Deductions
Add lines 4, 5e, 8e, 9, 14, 15, and 16. Enter the total on line 17. This figure is your total itemized deductions.
Compare line 17 to your standard deduction. If line 17 exceeds the standard deduction, enter it on Form 1040 line 12. If the standard deduction is larger, claim it unless specific circumstances require itemizing. Line 18 allows for an optional election to itemize rather than take the standard deduction, even if the amount is smaller. Check the box only if making this election for specific reasons.
Step 10: Complete and Attach Schedule A
Review all entries and calculations for accuracy. Verify that the required supporting forms are prepared, including Form 8283 for noncash contributions over $500, Form 4952 for investment interest if applicable, and Form 4684 for casualty losses.
Enter the name and Social Security number that match the information on Form 1040 exactly. Attach Schedule A behind Form 1040 or Form 1040-SR. Place supporting forms in proper order. Sign and date Form 1040. Both spouses sign joint returns. Submit by the April deadline or file an extension using Form 4868.
Critical 2023 Limitations
Medical expenses are deductible only above 7.5 percent of AGI. State and local taxes are capped at a combined total of $10,000, or $5,000 for individuals who are married and filing separately. Mortgage interest is limited by the loan date and amount. Charitable contributions face AGI percentage limits. Personal casualty losses are restricted to federally declared disasters. Miscellaneous itemized deductions are suspended through 2025.
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This checklist is for educational purposes only and does not constitute tax or legal advice. Always review official IRS instructions and consult a qualified professional for guidance.
