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Reviewed by: William McLee
Reviewed date:
December 23, 2025

IRS-Accurate Form 1040 Tax Year 2018 Checklist
Why 2018 Form 1040 Is Unique
For 2018, Forms 1040A and 1040EZ were eliminated. The redesigned Form 1040
introduced six numbered schedules—Schedules 1 through 6—to implement changes
under the Tax Cuts and Jobs Act of 2017. Significant changes include the suspension of
personal exemptions, increased standard deductions, and the new Section 199A
qualified business income deduction, which allows up to 20% of qualified business
income for qualifying businesses.

The standard deduction amounts for 2018 are $12,000 for single filers, $24,000 for
married filing jointly, $18,000 for head of household, and $12,000 for married filing
separately. The form uses a building block approach where most taxpayers file the base
form alone, while complex returns require supporting schedules.

2018 Year-Specific Programs Applicable to This Form
Through 2018, the Affordable Care Act shared responsibility payment—the individual
mandate penalty—required taxpayers without minimum essential coverage or
exemptions to make a payment when filing Form 1040. The Tax Cuts and Jobs Act
suspended personal exemption deductions and introduced a new 20% qualified
business income deduction under Section 199A, which became effective for 2018 and
remains in force through 2025.

Taxpayers with specified foreign corporation interests may report Section 965 transition
tax income and elect eight-year installment payments on Schedule 4.

Ten-Step Form 1040 (2018) Paper-Filing Checklist

  1. Step 1: Gather Required Income Documents

    Collect all Forms W-2 showing wages, salaries, and tips. Obtain Forms 1099-R for
    distributions from IRAs, pensions, and annuities. Retrieve Forms 1099-G for
    unemployment compensation and state tax refunds, and Forms 1099-MISC if
    applicable.

    Gather Schedule K-1 forms from partnerships, S corporations, estates, or trusts. If you
    enrolled in ACA Marketplace coverage, obtain Form 1095-A. Collect any other income
    statements showing taxable income for 2018.

    For 2018, claiming the child tax credit or credit for other dependents requires the
    dependent to have a valid Social Security number issued before the return’s due date,
    including extensions.

  2. Step 2: Calculate Total Income and Identify Adjustments

    Report wages on line 1, taxable interest on line 2b, and qualified and ordinary dividends
    on lines 3a and 3b. Enter taxable distributions from IRAs and pensions on line 4b.

    Report taxable Social Security benefits on line 5b.

    Add lines 1 through 5 and any Schedule 1, line 22 amount to reach line 6, which
    represents your total income. For 2018, identify adjustments to income, including
    educator expenses, student loan interest, the deductible portion of self-employment tax,
    and excess deduction from estate or trust termination under IRC Section 67(e). Report
    these adjustments on Schedule 1, line 36.

    Subtract Schedule 1, line 36, from line 6 to calculate line 7, your adjusted gross income.

  3. Step 3: Determine Standard Deduction or Itemize on Schedule A

    For 2018, your standard deduction depends on your filing status. Single filers receive
    $12,000. Married filing jointly receives $24,000. Head of household filers receive
    $18,000. Married filing separately: $12,000, but if one spouse itemizes deductions, the
    other spouse filing separately cannot claim the standard deduction and must also
    itemize. If you are age 65 or older or blind, add the applicable additional deduction
    amount to your standard deduction.

    If you itemize deductions on Schedule A, note that the state and local tax deduction is
    capped at a combined $10,000 for 2018, or $5,000 if married filing separately.

    Miscellaneous itemized deductions, subject to the 2% AGI floor, are eliminated.

    AGI-based itemized deductions are no longer subject to the general restriction. Enter
    the standard deduction amount or Schedule A total on line 8.

  4. Step 4: Calculate Qualified Business Income Deduction

    If you have qualified business income from a sole proprietorship, partnership, S
    corporation, trust, or estate, you may deduct up to 20% of that income on line 9. This
    deduction does not apply to wage income as an employee or income from a C
    corporation.

    For 2018, the deduction calculation involves comparing two amounts. The first is your
    combined qualified business income component, which may be limited by W-2 wages
    paid and the unadjusted basis of qualified property if your taxable income exceeds

    certain thresholds. The second amount is 20% of your taxable income minus net capital
    gain. Your deduction is the lesser of these two amounts.

    For taxpayers with taxable income below $157,500 for single filers or head of
    household, or $315,000 for married filing jointly, the qualified business income
    component is generally 20% of qualified business income. Above these thresholds,
    additional limitations apply based on W-2 wages and qualified property—complete Form
    8995 or Form 8995-A to calculate this deduction and attach the form to your return.

  5. Step 5: Calculate Taxable Income and Tax Liability

    Subtract line 8, your standard or itemized deduction, and line 9, your qualified business
    income deduction, from line 7, your adjusted gross income. The result is line 10, your
    taxable income. If the result is zero or less, enter zero.

    On line 11a, calculate your tax using the 2018 tax tables or tax computation worksheet.

    Tax rates for 2018 are 10%, 12%, 22%, 24%, 32%, 35%, and 37%.

    If you must include income from a child’s unearned income using Form 8814, tax on
    lump-sum distributions using Form 4972, or other special tax items, complete the
    appropriate forms and add those amounts to line 11. On line 11b, add any tax from
    Schedule 2.

  6. Step 6: Claim Credits on Form 1040

    On line 12a, claim the child tax credit with a maximum of $2,000 per qualifying child
    under age 17 who has a valid Social Security number. Complete Schedule 8812 if you
    qualify for the additional child tax credit.

    A qualifying child must be your dependent, under the age of 17 at the end of 2018, meet
    the relationship, residency, and support tests, and have a required Social Security
    number.

    For dependents who do not qualify for the child tax credit, claim the credit for other
    dependents with a maximum of $500 per dependent on line 12a or by completing the
    child tax credit worksheet.

    Add any amount from Schedule 3 on line 12b, including education credits, energy
    credits, foreign tax credit, child and dependent care credit, retirement savings
    contributions credit, and premium tax credit.

  7. Step 7: Account for Other Taxes and Adjustments

    On line 13, subtract line 12, your total credits, from line 11, your tax. If the result is zero
    or less, enter zero.

    On line 14, report other taxes from Schedule 4. These include self-employment tax,
    household employment tax, additional Medicare tax, additional tax on IRAs or other
    qualified retirement plans, alternative minimum tax, Section 965 net tax liability
    installment, and health care individual responsibility payment through 2018.

    On line 15, add lines 13 and 14 to arrive at your total tax.

  8. Step 8: Report Tax Payments and Withholding

    On line 16, enter federal income tax withheld from Forms W-2, box 2, Forms 1099-R,
    box 4, and Forms 1099-G, if applicable.

    On line 17a, claim the earned income credit if eligible. On line 17b, claim the additional
    child tax credit from Schedule 8812. On line 17c, report credits from Schedule 5. Add
    lines 16 and 17 to calculate total payments on line 18.

    For 2018, if you had health coverage for all months of the year through an employer,
    government program, individual market plan, or qualified exemption, check the full-year
    health care coverage or exempt box on the front of Form 1040. If not, complete Form
    8965 to calculate any shared responsibility payment due and include that amount on
    Schedule 4, line 61.

  9. Step 9: Calculate Refund or Amount Owed

    On line 19, compare line 18, your total payments, to line 15, your total tax. If line 18
    exceeds line 15, line 19 is your overpayment.

    You may elect to have the overpayment refunded on line 20a or applied to your 2019
    estimated tax on line 21. If line 15 exceeds line 18, line 22 shows the amount you owe.

    Payment methods appear in the Form 1040 instructions.

    On line 23, calculate any estimated tax penalty if required by following the instructions.

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    • Tax relief options if you owe the IRS
  10. Step 10: Sign, Assemble, and Prepare for Mailing

    Sign and date Form 1040 using a pen. If filing jointly, both spouses must sign the return.

    If the IRS assigned you an Identity Protection PIN, enter it in the designated box.

    Attach all required forms and schedules in the following order: Form 1040 pages 1 and
    2, Schedule 1 if you have additional income or adjustments, Schedule 2 if other taxes

    apply, Schedule 3 if additional credits apply, Schedule 4 if other taxes apply, Schedule 5
    if other payments or refundable credits apply, Schedule A if itemizing, Schedule B if you
    have interest or dividend income exceeding $1,500, Schedule C if self-employed,
    Schedule D if you have capital gains or losses, Schedule E if you have rental or
    partnership income, Schedule H if you employ household workers, and Schedule SE if
    you have self-employment income of $400 or more.

    Attach Form W-2, copy B, all pages. Attach Form 1099-R or other relevant 1099 forms if
    tax was withheld. Attach Form 1095-A if applicable for premium tax credit reconciliation
    on Form 8962. Include any other required schedules or forms such as Forms 8962,
    8995 or 8995-A, 8814, 4972, 8919, 5329, 6251 for alternative minimum tax, or 965-A for
    Section 965.

    For 2018 paper filers, mail the return to the address listed in the Form 1040 instructions
    or on the IRS Where to File page for the current year.

    Key Form 1040 (2018) Limitations
    Nonresident aliens must file Form 1040-NR and cannot claim the standard deduction
    unless they elect to be treated as a resident alien for tax purposes with specific
    conditions, including marriage to a U.S. citizen or resident alien.

    Taxpayers filing married filing separately cannot claim the standard deduction if their
    spouse itemizes deductions. Persons who are nonresident aliens, dual-status aliens
    except those meeting specific requirements, or filing a return for a period of less than 12
    months cannot claim the standard deduction.

    The qualified business income deduction under Section 199A does not apply to income
    earned as an employee through W-2 wages or through a C corporation. The deduction
    does not apply to specified service trade or business income for higher-income
    taxpayers.

    Compliance Notes for 2018 Form 1040
    The form must be signed under penalties of perjury with the declaration that you have
    examined this return and accompanying schedules and statements. To the best of your
    knowledge and belief, they are true, correct, and complete.

    If a paid preparer completes part of the return, the preparer’s declaration must be based
    on all information of which the preparer knows.

    If the IRS issued an Identity Protection PIN to you, you must enter it in the designated
    box on the Form 1040 signature line. An incorrect or missing PIN may result in rejection
    for e-filing or a delay for paper filing.

    A taxpayer filing Form 1040 for 2018 cannot claim a personal exemption deduction for
    any person, including themselves, their spouse, or their dependents. All dependent
    Social Security numbers reported on the form must be valid for employment and issued
    before the return’s due date, including extensions, to claim the child tax credit or
    additional child tax credit.

    If you’re missing tax documents or want to ensure the numbers you enter match IRS records,
    we can help.

    If you’re missing tax documents or want to ensure the numbers you enter match IRS records,
    we can help.

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