This is a useful next topic because Schedule 1 (Form 1040) is different from the main Form 1040 article: it focuses on additional income and adjustments to income that cannot be entered directly on the main return. The IRS’s 2025 instructions explain how these amounts flow to Form 1040.

When preparing your federal income tax return, not every type of income or tax adjustment fits directly onto Form 1040. That is where IRS Schedule 1 comes in. This supporting form helps taxpayers report certain additional income and claim eligible adjustments that can affect their overall federal income tax calculation.

Understanding Schedule 1 is important for self-employed individuals, freelancers, retirees, students, and taxpayers who receive income from sources beyond a regular paycheck.

At AIM Financial, we help individuals and families understand tax forms and prepare their federal income tax returns. If you live in Grand Rapids, Kentwood, Wyoming, or elsewhere in West Michigan, learning how Schedule 1 works can help you organize your tax documents and avoid overlooking important information.

What Is IRS Schedule 1?

Schedule 1, officially titled Additional Income and Adjustments to Income, is attached to Form 1040, Form 1040-SR, or Form 1040-NR when applicable.

The form is divided into two main parts:

• Part I — Additional Income: Reports certain income items that are not entered directly on the main tax return.
• Part II — Adjustments to Income: Reports eligible adjustments that reduce the income used to calculate adjusted gross income.

Schedule 1 is not the same as Schedule 1-A, which is a separate form for certain additional deductions available under applicable tax-year rules.

The amounts calculated on Schedule 1 are transferred to the appropriate lines of Form 1040. You may need other forms or schedules to calculate the figures before entering them on Schedule 1.

For the official form and current instructions, visit IRS.gov — Form 1040 and Instructions.

Who May Need to File Schedule 1?

You may need Schedule 1 if you receive certain types of income or qualify for specific adjustments to income.

Examples include taxpayers who:

• Earn business income or have a business loss.
• Receive unemployment compensation.
• Receive certain taxable state or local income tax refunds.
• Have certain gambling winnings or other additional income.
• Claim an eligible deduction for student loan interest.
• Claim the deductible portion of self-employment tax.
• Qualify for certain adjustments involving retirement contributions or other eligible expenses.

Not everyone needs Schedule 1. If all your income and tax information can be reported directly on Form 1040 and you have no applicable Schedule 1 items, you may not need to file it.

The requirement depends on your financial circumstances and the tax year involved.

Part I: Reporting Additional Income

Part I of Schedule 1 covers certain income that must be reported separately from the main income entries on Form 1040.

1. Taxable State and Local Income Tax Refunds

Some taxpayers receive a state income tax refund after filing a previous year’s state return.

A state refund is not automatically taxable for federal income tax purposes. Whether you must report it depends in part on how you treated the state taxes on your prior federal return.

For example, if you claimed the standard deduction in the prior year, a state income tax refund generally does not create taxable income under the tax benefit rule. If you itemized deductions and deducted state income taxes, some or all of the refund may be taxable, depending on the circumstances.

Keep your state refund information and prior-year federal return available when preparing Schedule 1.

2. Business Income or Loss

Many sole proprietors report business income or loss on Schedule C before transferring the applicable amount to Schedule 1.

For example, a self-employed consultant in Grand Rapids might earn $65,000 in business revenue and have $18,000 in allowable business expenses. The resulting $47,000 net profit would generally be reported on Schedule C and then included in the applicable additional-income calculation.

The business profit may also affect self-employment tax, which is calculated separately using Schedule SE when required.

3. Other Income Items

Depending on the tax year and your circumstances, Schedule 1 may also include certain amounts such as:

• Unemployment compensation.
• Gambling winnings.
• Certain prizes and awards.
• Certain cancellation-of-debt income.
• Other income specifically listed in the form instructions.

Different types of income can have different tax rules. For example, cancellation-of-debt income may qualify for an exclusion or exception in certain circumstances. Do not assume that every amount reported on a tax document is automatically taxable in full or belongs on the same line.

Read the instructions for the specific income item before completing the form.

4. Payments Reported on Form 1099-K

Schedule 1 instructions may also address certain amounts reported on Form 1099-K that were included in error or relate to personal items sold at a loss.

Receiving Form 1099-K does not automatically mean the entire amount shown is taxable income. The correct treatment depends on what the payments represent.

For example, money received as reimbursement for a shared household expense is different from income earned by selling goods as a business. Selling a personal item at a gain may have different tax consequences from selling it at a loss.

Keep transaction records and determine the correct reporting method rather than simply treating every Form 1099-K amount as business income.

Part II: Adjustments to Income

Part II of Schedule 1 reports eligible adjustments to income. These adjustments are sometimes called deductions above the line because they generally reduce income before adjusted gross income is calculated.

1. Deductible Part of Self-Employment Tax

Self-employed taxpayers generally pay Social Security and Medicare taxes on qualifying self-employment earnings.

Eligible taxpayers can generally deduct one-half of their self-employment tax when calculating adjusted gross income.

For example, if your calculated self-employment tax is $6,000, the potential deduction for one-half of that tax would generally be $3,000, assuming the calculation and eligibility rules support that amount.

This deduction does not eliminate the self-employment tax itself. It reduces income for purposes of the federal income tax calculation.

2. Student Loan Interest Deduction

Eligible taxpayers may be able to deduct qualifying student loan interest, subject to applicable requirements and income limits.

Eligibility can depend on filing status, modified adjusted gross income, the type of loan, and whether the taxpayer is legally responsible for the debt.

Keep Form 1098-E, if received, and other relevant loan records. Receiving the form does not automatically establish that you qualify for the deduction.

3. Other Eligible Adjustments

Depending on the tax year and your circumstances, Schedule 1 may include other adjustments such as eligible educator expenses, certain retirement-related deductions, or qualifying contributions and expenses specifically listed in the instructions.

The available adjustments and their requirements can change. Check the instructions for the exact year of the return you are preparing.

How Does Schedule 1 Affect Your Federal Tax Return?

Schedule 1 helps determine the amounts transferred to Form 1040.

Generally, the additional income from Part I increases total income reported on the main return. The adjustments from Part II reduce income when calculating adjusted gross income.

Adjusted gross income is important because it can affect eligibility for certain deductions, credits, and other tax benefits.

For example, a taxpayer with self-employment income may need Schedule C to calculate business profit, Schedule SE to calculate self-employment tax, and Schedule 1 to report the business income and the eligible deduction for part of the self-employment tax.

These forms work together, so an error on one schedule can affect other parts of the federal return.

Common Schedule 1 Mistakes to Avoid

When preparing Schedule 1, watch for these common errors:

1. Reporting income twice: Make sure amounts transferred from supporting schedules are not accidentally counted again.
2. Treating every state refund as taxable: Review the prior-year deduction and applicable tax benefit rules.
3. Overlooking self-employment tax adjustments: Eligible taxpayers may qualify for a deduction for one-half of self-employment tax.
4. Assuming every Form 1099-K amount is taxable: Identify the actual transactions and report them correctly.
5. Claiming deductions without checking eligibility: Income limits and other restrictions may apply.
6. Using the wrong tax year’s form: Always use the form and instructions for the year being filed.
7. Confusing Schedule 1 with Schedule 1-A: These are separate forms with different purposes.

Good recordkeeping and careful review can help reduce these errors.

How AIM Financial Can Help With Schedule 1

Schedule 1 can involve several different kinds of income and deductions. Determining the correct treatment may require reviewing business records, tax documents, prior-year returns, and other supporting forms.

AIM Financial helps individuals and families in Grand Rapids, Kentwood, Wyoming, and throughout West Michigan prepare for federal income tax filing and understand the documents needed for an accurate return.

Whether you have self-employment income, a state tax refund, unemployment compensation, student loan interest, or other tax items, professional tax-preparation assistance can help you understand how these amounts affect your return.

Contact AIM Financial for help preparing your federal income tax return and reviewing the schedules that may apply to your situation. Organizing your records and asking questions before filing can help make tax season less stressful.

Final Thoughts

IRS Schedule 1 is an important supporting form for taxpayers who have certain additional income or qualify for adjustments to income. It connects information from other tax forms and schedules to the main federal income tax return.

Understanding the two parts of Schedule 1 can help you identify the records you need, recognize potential deductions, and avoid common filing mistakes.

For assistance with individual income tax preparation in Grand Rapids and throughout West Michigan, contact AIM Financial to discuss your tax-preparation needs.