how to fill out a 1040 form
Written by BooksMerge | Published: January 2, 2026

Filing the taxes on time and accurately is a bit of a challenging task, especially if you are filing Form 1040 for the first time.

Moreover, this form is basically used by U.S. citizens and residents for filing an annual income tax return. Apart from this, it is also used to report income to the IRS, calculate tax liability, and identify whether you owe additional taxes or are due a refund.

Herein, this blog contains all the details regarding who can file, different tax forms, schedules, and how to fill out the tax form.

Table of Contents

Who Must Fill Out the 1040 Form?

The 1040 form is mainly filed by U.S. taxpayers for filing an annual income tax return. However, the Form 1040-SR is an optional alternative for accessing Form 1040 for taxpayers 65 or older. Besides this, the Form 1040-SR accesses the same schedules and instructions as the Form 140 does. This form is to be filed if your

  • Income above standard deduction ($15,750 single, $31,500 married filing
    jointly for 2025)
  • Self-employment income over $400
  • You owe special taxes
  • You want to claim refundable credits

What You Need Before Filling Out a 1040 Form?

Before filing the 1044 form, you must have the following documents that includes personal details, identification, income documentation and documents for income and credits.

A. Personal Details & Identification

  •  Add the legal name, current address, and date of birth.
  •  Social Security Number (SSN) or Individual Taxpayer Identification Number (ITIN) for yourself, your spouse when filing jointly, and all dependents.
  •  Insert the bank account and routing numbers for direct deposit of a refund or electronic payment of taxes owed.
  •  IP PIN if the IRS has issued.
  •  Your Adjusted Gross Income from the previous year’s tax return if you are filing electronically.
  •  Spouse Details
  •  Filing Status
  •  Prior Year Details

B. Income Documentation

Collect all those forms that report the income you get during the tax year.

  • Form W-2
  • Forms 1099 from banks, issuing agencies, and other payers.
    • Form 1099-INT for interest income
    •  Form 1099-DIV for dividends.
    •  Form 1099-R for pension, annuity, or retirement plan distributions
    •  Form 1099-G for certain government payments, such as unemployment compensation.
    • Form 1099-MISC or 1099-NEC for income from freelance work or other miscellaneous sources.
    • Form 1099-K for income from payment cards and third-party network transactions.
  • Schedule K-1 if you have income from a partnership, S corporation, estate, or trust.
  • Wages and Salaries
  • Unemployment Income
  • Interest & Dividends
  •  Investments & Sales
  • Retirement Income
  • Self-Employment/Side Jobs
  • Other Income

C. Documents for Deductions & Credits

You may require certain records when you plan to itemize deductions or claim certain credits.

  • Medical & Dental Expenses
  • Home mortgage interest statements
  • Records of charitable donations
  • Education Expenses
  • Student loan interest statements
  • Childcare expenses
  • Retirement contributions
  • Form 1095-A
  • Health Insurance
  • Homeownership
  • IRA Contributions

What are the Different Types of 1040 forms?

Below, we have discussed the different types of 1040 forms according to your age, income type, or tax situation. It may include Form 1040, 1040-SR, 1040-NR, and 1040-X.

1. Form 1040 (U.S. individual income tax return):

It is the most common form that is used mainly by U.S. taxpayers and covers all filing situations.

  • Single or married taxpayers
  • Taxpayers with dependents
  • People with income from jobs, side businesses, investments, or Social Security
  • Taxpayers claiming itemized deductions or tax credits

2. Form 1040-SR (For seniors aged 65 and older)

It is a special version of a form of the standard 1040 and is for the age group of 65 and older.

  • This form accesses larger text and consists of a chart that lets senior citizens compute their standard deductions.
  • Moreover, it is similar to the standard 1040 form.
  • Above all, this form is helpful for the seniors getting Social Security & retirement income.

3. Form 1040-NR (For non-resident aliens)

This form is to be filed by non-resident citizens who worked or earned money in the U.S. Moreover, this 1040 form consists of the following details:

  • Foreign students on F, J, M, or Q visas
  • International investors with U.S. income
  • People who lived in the U.S. temporarily for work
  • It cannot be filled “jointly.”

4. Form 1040-X (Amended U.S. individual income tax return)

In case you have made any mistakes on your original tax return, you don’t need to start over; you can file Form 1040-X. This form is also known as the amended 1040 form. You require this form if;

  • You missed reporting some income
  • In case you haven’t claimed a credit or deduction you qualified for
  • The IRS sends you a notice asking for changes

types of irs form 1040

What are the Different Schedules For Form 1040?

The different schedules that are available for Form 1040 include Schedule A, Schedule B, Schedule C, Schedule D, Schedule E, Schedule F, Schedule H, Schedule J, Schedule R, Schedule SE, and Schedule 8812.

1. Schedule A, Itemized Deductions:

The Schedule A (Form 1040), Itemized Deductions, includes recent updates, related forms, and instructions on how to file.

2. Schedule B, Interest & Ordinary Dividends

Schedule B, Interest & Ordinary Dividends, contains the details like recent updates, related forms, and instructions on how to file.

3. Schedule C, Profit or Loss From Business (Sole Proprietorship)

The Schedule C used for Profit or Loss from Business, is required for reporting income or loss from a business operated or profession as a sole proprietor. Also, it consists of recent updates, related forms, and instructions on how to file.

4. Schedule D, Capital Gains & Losses

The Schedule D form for capital gains & losses includes recent updates, related forms, and instructions on how to file. Also, it is used for reporting sales, exchanges, or some involuntary conversions of capital assets, certain capital gain distributions, and non-business bad debts.

5. Schedule E (Supplemental Income and Loss)

The Schedule E, Supplemental Income and Loss, consists of recent updates, related forms, and instructions on how to file. Also, this form is used for reporting income received via rental properties, royalties, partnerships, S corporations, estates, trusts, and residual interests in REMICs.

6. Schedule F, Profit or Loss From Farming

The Schedule F, used for Profit or Loss From Farming, comprises recent updates, related forms, and instructions on how to file. It can be used for reporting farm income and expenses.

7. Schedule H, Household Employment Taxes

The Schedule H, Household Employment Taxes, comprises recent updates, related forms, and instructions on how to file. Also, this form is used by household employers for reporting household employment taxes.

8. Schedule J, Income Averaging for Farmers and Fishermen

The Schedule J, Income Averaging for Farmers and Fishermen, comprises recent updates, related forms, and instructions on how to file.

9. Schedule R, Credit for the Elderly or the Disabled

The Schedule R form is for the credit for the Elderly or the Disabled, which covers recent updates, related forms, and instructions on how to file. You can use this form to identify the credit for the elderly or the disabled.

10. Schedule SE, Self-Employment Tax

The Schedule SE form is for the Self-Employment Tax, which contains recent updates, related forms, and instructions on how to file. Moreover, this form is accessed by self-employed persons to figure the self-employment tax due on net earnings.

11. Schedule 8812, Credits for Qualifying Children and Other Dependents

The Schedule 8812 for Credits for Qualifying Children and Other Dependents covers Credits for Qualifying Children and Other Dependents. This is used to figure out the additional child tax credit.

form 1040 schedules

How to Fill Out a 1040 Form Step by Step?

For filing out IRS tax form 1040 accurately, you need to go through the step-by-step instructions outlined below.

First Step: Get Ready With Your Documents & Personal Details

Before beginning the process, it is essential to have all the mandatory documents and verify the personal details. The following are the documents that you will require:

Income Documents

  • Receipts for deductible expenses
  • Prior year tax return for reference
  • Form 1098 (mortgage interest, student loan interest, education expense)
  • W-2 forms from all employers (Box 1 for wages)
  • 1099 forms (INT for interest, DIV for dividends, NEC/MISC for contract work, B for investment sales).

Personal Documents

  • You must mention your filing status, i.e., Single, Married Filing jointly, Married Filing separately, head of households, or Qualifying Surviving spouse.
  • Insert the Current address along with the bank details for direct deposit.
  • Social Security numbers for yourself, spouse, and all dependents.

Important Tip: You must check out the Ssns against the Social Security cards. If there is any incorrect number, it may reject the returns and delay refunds for months. There are many married couples who opt for the Married Filing Jointly for lower tax rates. Whereas the head of household offers better rates than single, but it must be a qualifying dependent.

Second Step: Report All Incomes (Lines 1-9)

Herein, you are required to report every source of income that you received throughout 2025 for computing the total income according to these 1040 instructions.

1. Wage Income (Lines 1a- 1z):-

Herein, you must include Box 1 from all the W-2 forms. You can also insert any household employee wages, allocated tips, dependent care benefits, or military combat pay in specialized lines 1b-1h.

2. Interest & Dividends (Lines 2-3):

In this section, you must report the tax-exempt interest from the municipal bonds (lines 2a). Also, it includes taxable interest from banks (Line 2b). Beyond this, you can also report the qualified dividends, which may receive favorable tax treatment (line 3a) and ordinary dividends (line 3b). In case your total interest or dividends are more than $1,500, then you have to attach the Schedule B.

3. Retirement Income (Lines 4-6):

In this column, you must report IRA distributions reflecting both total as well as taxable amounts (Lines 4a- 4b). Also, you may report the pensions and annuity income (Lines 5a-5b), Social Security benefits, along with the total received (Lines 6a). Beyond this, you must mention the taxable portion calculated by accessing the worksheet that might be 0%, 50%, or 85% taxable based on other income (Line 6b).

4. Other Income (Lines 7-8):

Herein, you have to mention capital gains or losses from selling stocks, bonds, real estate, or crypto using the Schedule D (Line 7). Also, you need to report if there is any additional income received from Schedule 1, including unemployment, gig economy income, gambling, winnings, or alimony received via pre-2019 divorces (Line 8).

5. Total Income (Line 9):

You have to include lines 1z through 8 to compute the total income received before deductions.

Important Tip: Herein, don’t skip to answer the new digit assets; either you have to say yes or no regarding the cryptocurrency and NIFT transactions. The IRS gets the reports from crypto exchanges, so it is necessary to answer accurately.

Third Step: Calculate the Gross Income & Choose Deductions (Lines 10-15)

You can reduce your income by making adjustments and deductions to identify the taxable income according to Form 1040 Instructions 2025.

Adjustments to income (Line 10):

Herein, you can claim “above-the-line” deductions from Schedule 1 Part II that you receive when taking the standard deduction.

  • Educator expenses ($300 for 2025)
  • IRA contributions (up to $7,000, or $8,000 if age 50+)
  • Student loan interest (up to $2,500)
  • Health Savings Account contributions
  • Half of the self-employment tax
  • Self-employed health insurance premiums

Adjusted Gross Income (Line 11):

Herein, you need to deduct Line 10 from Line 9. With the help of this crucial number, you can easily identify the eligibility for various tax benefits. If the AGI is lower, it states that there are more available credits and deductions.

Standard Vs Itemized Deduction (Lines 12a- 12c):

For the year 2025, the standard deductions for Singles are $15,750, married and filing jointly $31,500, Head of Household $23,625, and married filing separately $15,750. You need to sum up $2,000 if single/HOH, and for the age group of 65+ blind. Also, sum up $1,600 per person if married and in the age group of 65+ or blind. Itemize if the total deductions comprise medical expenses above 7.5% of AGI, state and local taxes up to $10,000, mortgage interest, and charitable donations.

Qualified Business Income Deduction (Line 13):

The self-employed individuals and business owners may deduct up to 20% of qualified business income. You need a Form 8995 or 8995-A for calculation.

Taxable deductions (Line 14):

Herein, you must add lines 12c and 13.

Taxable Income (Line 15):

You need to deduct Line 14 from Line 11. As a result, this amount will identify your tax bracket. You need to insert zero if the result is negative.

Important Tip: You must remember your AGI, and you have to sign it electronically next year.

Fourth Step: Calculate Tax, Apply Credits, and Determine Final Tax (Lines 16-24):

Compute your tax liability and then reduce it with the available credits using the 1040 instructions.

Calculate tax (Line 16):

You must access the tax table if the taxable income falls under the $100,000 or Tax Computation Worksheet if it exceeds $100,000. For the year 2025, federal tax brackets include:

  • 10% on income $0-$11,925 (single)
  • 12% on income $11,926-$48,475
  • 22% on income $48,476-$103,350
  • 24% on income $103,351-$197,300
  • Higher brackets apply to income above these levels

calculate tax

If you are having capital gains, then access the Schedule D Tax Worksheet for preferential taxes.

Additional taxes (Line 17):

You need to add special taxes from Schedule 2 if applicable. It also includes Alternative Minimum Tax (AMT), self-employment tax, additional Medicare tax, and Net Investment Income tax.

Tax Before credits (Line 18):

Herein, sum up Lines 16 and 17.

Apply tax Credits (Lines 19-21):

The credits will eventually reduce the tax dollar-for-dollar, and make them more valuable than deductions:

  • Child Tax Credit: $2,000 per qualifying child under the age of 17 with up to $1,700 refundable (Line 19).
  • Other Credits from Schedule 3: It covers earned Income Tax Credit, education credits (American Opportunity or Lifetime Learning), Retirement Savings Contributions Credit, child and dependent care credit, and residential energy credits (Line 20).

Total Credits (Line 21):

You need to sum up Lines 19 and 20.

Tax after credits (Line 22):

You must deduct Line 21 from Line 18. Herein, insert the zero if the amount is negative.

Other taxes (Line 23):

Rare additional taxes from Schedule 2, which might consist of household taxes.

Total Tax (Line 24):

You must sum up Lines 22 and 23, which is the final tax liability for 2025.

Fifth Step: Compare Payments, Calculate Refund or Balance Due, and Submit (Lines 25-37):

Check whether you have overpaid or underpaid taxes and file your return following the 1040 instructions.

Report payments made (Lines 25a-25d):

  • Federal tax withheld from W-2 Box 2 (sum up all employers) (Line 25a)
  • Estimated tax payments made quarterly during 2025 (Line 25b)
  • Earned Income Tax Credit if claimed (Line 25c)
  • Additional Child Tax Credit refundable portion (Line 25d)

Other payments (Lines 26-32):

You need to report from Schedule 3 i, i.e., excess Social Security Withheld if you are having multiple jobs, credit for federal tax on fuels, and other refundable credits.

Total Payments (Line 33):

Herein, sum up Lines 25a via 25d and Line 32. It covers everything that you paid to the IRS throughout 2025.

Identify Refund or balance due:

  • If Line 33 > Line 24: You overpaid (Line 34 shows overpayment amount)
  • If Line 24 > Line 33: You owe tax (Line 37 shows balance due)

Choose refund options (Lines 35a – 36):

  • Line 35a: Mention the amount of the Refund, and it can be less than Line 34.
  • Lines 35b-35c: It covers direct deposit information, which includes routing number (9 digits), account number, and account type (checking/savings). Look for the check or contact your financial institution.
  • Line 36: The amount that you have to apply to the 2026 estimated tax, which reduces quarterly payments next year.

Sign, date, and file

  • If the Married person is filing jointly, then both spouses must sign.
  • Thereon, sign in using the blue or black ink. Mention the date and occupation.
  • You must remember that the unsigned returns are not valid, and the IRS will return them.
  • Another important thing is that you need to file the Form 1040 by April 15, 2026 (or October 15, 2026, with an extension).
  • Beyond this, make sure that you pay the balance due by April 15 to prevent penalties and interest.

How to Fill Out Form 1040 for Your Situation?

Herein, we have described how to fill out the Form 1044 according to different situations.

Case 1: If you are a first-time filer

It might be a bit challenging for the users to file the Form 1040 for the first time. So, to help you out, you must walkthrough the following steps:

  • Collect the Necessary Documents: You must get ready with your income statements (including W-2 or 1099 forms), proof of any deductions or credits you are eligible for, and your Social Security Number (SSN).
  • Personal Details: Herein, insert the personal details, including name, SSN, and address. However, if you are below 18, your parents have to file the form.
  • Income Section: You need to report your income here. If you are employed in a regular job, file the form W-2. The other income tax filers need to file the 1099 form.
  • Deductions & Credits: You might be eligible for deductions, which include education or student loans. Credits, including the Earned Income Tax Credit, and deductions that consist of the standard deduction, but make sure that you qualify for other deductions.
  • Sign & File: After providing all the details, sign and then date your form. However, you have the option to file the form online or via email.

Case 2: If you have W-2 income only

If you are only working as an employer and getting the W-2 form, then do as follows:

  • Fill Out the Income Section (Line 1): Herein, you have to report your total income from the W-2 form. Box 1 here represents your wages.
  • Standard Deduction: If you don’t have any other deduction, then claim the standard deduction.
  • Tax Calculation: Once you add your income and deductions, access the tax table to identify how much tax you owe. There might be the possibility that you have previously paid taxes via withholding that reflects on your W-2. Also, this amount is mentioned in Box 2 of W-2.
  • Refund or amount Due: If the amount of taxes you paid through withholding is more than you owe, then you might get the refund. If the amount of taxes is less, then you have to pay the difference amount.

Case 3: If you have 1099 or self-employed income

If you file a 1099 form or self-employed income, then the steps may vary, as explained below.

  • Report Income: On the Form 1040, you have to report your income on Line 8 (other income) and Schedule C (Profit or Loss from Business). The income received via a 1099 form will be reflected here.
  • Business Expenses: As a self-employed person, you can deduct certain expenses that include supplies, home office expenses, or business-related travel. As a result, it will minimize your taxable income.
  • Self-Employment Tax: If you are earning above $400 from self-employment, then fill out Schedule SE to compute. Then, pay the self-employment tax.
  • Estimated Payments: If you expect to owe taxes, you have to pay quarterly estimated payments throughout the year to avoid penalties.

Case 4: If you are a senior or filing Form 1040-SR

The Form 1040-SR is quite similar to the Form 1040, but it is prepared basically for the age group of 65 or older.

  • Income Section: Herein, you need to report the income as you do on Form 1040, whether it’s from Social Security pensions, W-2 wages, or retirement plans.
  • Deductions: The seniors may qualify for the additional standard deductions.
  • Other Considerations: If you are having some specific retirement income, you must check out any tax credits or deductions that apply to retirees.

Case 5: If you have dependents

In case you are claiming someone as a dependent, then it may hamper your taxes.

  • Dependents Section: Herein, on the Form 1040, you have to list each dependent’s name, SSN, and relationship to you.
  • Tax Benefits: Claiming a dependent may make you eligible for numerous tax breaks:
    • Child Tax Credit: In case the dependent is under 17 years, then you fall under the category of Child Tax Credit, which may lower your tax bill.
    • Earned Income Tax Credit (EITC): It is basically a credit for low to moderate-income taxpayers who are dependents.
    • Dependent Care Credit: If you are paying for the child or dependent care, it means you are eligible for this credit.
  • Standard Deduction and Filing Status: The filing status may change if you are a dependent, which may enhance your standard deduction.

What are the Common Mistakes to Avoid When Filling Out Form 1040?

At times, certain mistakes made while filing the 1040 form may cause a heavy loss to the taxpayers. So, to file the tax return accurately without any delays, you must take care of the following things.

1. File Electronically:

You have to file the IRS tax form 1040 electronically, either through e-file or IRS Free File. As a result, it minimizes the errors made in tax returns as the software updates regarding any miscalculations on its own.

2. Correct Name of Dependent:

Another important thing to consider is that you have inserted the accurate name and social security number (SSN) for each dependent you claim. Also, verify that every dependant’s name and SSN match the dependant’s social security number. Furthermore, for every child below age 17 qualifying as a child comes under child tax credit must mark the box in column 4 of the Dependents section.

3. Check Your Math Errors & Miscalculations:

You need to check your maths, mainly for the child tax credit, earned income credit (EIC), taxable social security benefits, total income, itemized deductions, and taxable income, total tax, federal income tax withheld, and refund or amount you owe.

4. Appropriate Method to Identify your tax:

It is essential that you use the right method to figure out your tax.

5. Insert the SSN in the correct column:

The taxpayers must ensure that they enter the correct SSN in the space available on page 1 of Form 1040 or 1040-SR. In case you are married or want to file jointly, provide your spouse’s SSN. Make sure that your name and SSN both agree with your Social Security card.

6. Verify where you file before mailing:

You must have a look at where you file your return before mailing.

7. Avoid Filing More than One Original Return:

You must verify that you won’t file more than one original return for the same year, even if you receive your refund. This is so because filing multiple tax returns for the same year or sending in numerous copies could delay the refund.

8. Sign & Date Form 1040 or 1040-SR:

Don’t forget to sign and date Form 1040 or 1040-SR, and also provide your occupation.

9. Attach the W-2 or Necessary Forms:

Also, it’s essential to attach your W-2 form along with other necessary forms and schedules. You need to attach all the forms along with the schedules in an organized manner.

10. Payment Details:

If you owe tax and are paying via check or money order, it’s crucial to mention all the payment details.

11. Use the Correct column of EIC:

If you are getting the EIC, it’s necessary to check that you are using the correct column of the EIC table for your filing status. Also, verify the number of qualifying children who have a valid SSN.

12. Provide the Personal Details Accurately:-

The taxpayer must provide the correct name and address. Also, provide your spouse’s name in the same manner as shown on the last return.

13. Enrolled Correctly in Marketplace:-

Check that you and your spouse, with whom you are filing jointly, are enrolled in marketplace coverage, and advance payments must be attached to Form 8962. If there are any excess payments, then you need to repay them if someone else has enrolled you in marketplace coverage, and that individual isn’t claimed as a dependent.

How to File Form 1040 Online or Via Mail?

You have the option to file the Form 1040 online or via mail. Below, we have described the procedure for both of them.

A. File Electronically

Most often, the taxpayers opt for electronically filing the 1040 to get the refund quickly. There are many tax professionals who charge a fee to file the tax return electronically. Even if you prepare the return yourself with tax software, you need to pay a fee for filing the return. But if you wish to qualify for free online filing, then go to Free File.

B. File Through the Mail

If you mail a 1040 form, then it may take approximately six weeks for processing. You need to ensure that you attach the following documents:

  • Copy of all your Form W-2 to the front of your return.
  • Attach the copies of Form W-2G, Form 1099-R, and any other income document if there is a federal income tax withheld to the front of your return.
  • Related Schedules and forms are behind your return in the sequence number situated at the upper right corner of the schedule or form.
  • Form W-2 c if received, then link a copy of both your original Forms W-2 and Forms W-2 c.
  • If there are any other applicable forms, make sure to attach them to the front of the return.

Where to File Form 1040?

You don’t have to think much about filing the tax form in the right area when you file the 1040 form electronically. On the other side, if you’re filing a paper return, send it to the address mentioned in the instructions for the form you’re filing.

What is the Deadline to File Form 1040 in 2025?

The tax deadline for filing the Form 1040 is April 15, 2025. You can get the extra time for filing the taxes if:

  • You are affected by a federally-declared disaster.
  • On the due date, if you are staying out of the country or are a military member.

Extension For Filing Form 1040

Conclusion

So, we conclude this post and hope that now you can easily fill out the 1040 form. Thus, it also helps you in filing taxes accurately, which prevents you from paying heavy tax penalties for wrong or late filing. Furthermore, if you still require any additional help, then connect with our Booksmerge experts for help.

FAQ's

Yes, you can fill out the Form 1040 on your own through the following methods.

  • IRS Free File program
  • IRS Direct File
  • Commercial Tax Software
  • Free File Fillable Forms
  • Paper Forms

Yes, you can file the Form 1040 for free as per your income and tax situation.

In case you made a mistake on Form 1040, then you have to file Form 1040-X to correct the error.

The taxpayers only need to file the additional schedules along with Form 1040 when the tax situation covers income, deductions, or credits that don’t fit on the main form itself.

If you have filed the 1040 form electronically, then the IRS will refund in less than 21 days, especially when accessing the direct deposit form. Whereas, the paper returns may consume more time, i.e, 6 weeks or more.

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