Schedule 3 (Form 1040) Filing Checklist for Tax Year 2018
Overview and 2018 Tax Form Redesign
Schedule 3 serves as a mandatory attachment to Form 1040 for reporting nonrefundable tax credits. The 2018 tax year introduced a completely redesigned Form 1040 system, following the enactment of the Tax Cuts and Jobs Act, which eliminated Forms 1040A and 1040EZ. All individual taxpayers now use a simplified, two-page Form 1040, accompanied by six numbered schedules for additional reporting requirements.
Nonrefundable credits reduce tax liability to zero but cannot generate refunds. Schedule 3 consolidates five primary credit categories plus provisions for other specialized credits, creating organized reporting for taxpayers with qualifying situations.
Key Tax Law Changes for 2018
The Tax Cuts and Jobs Act fundamentally restructured individual taxation, effective tax year 2018. Personal exemptions of $4,050 per person were suspended through 2025, eliminating deductions for taxpayers, spouses, and dependents. Standard deductions nearly doubled to $12,000 for single filers, $24,000 for married filing jointly, and $18,000 for head of household, offsetting the elimination of the exemption for most taxpayers.
The child tax credit increased from $1,000 to $2,000 per qualifying child under age 17, with $1,400 potentially refundable as an additional child tax credit. A new $500 nonrefundable credit for other dependents has been created for qualifying dependents who cannot be claimed for the child tax credit, including children aged 17 and older, qualifying relatives, and dependents with Individual Taxpayer Identification Numbers.
Ten-Step Filing Checklist
Step 1: Determine Schedule 3 Filing Requirement
Verify whether you must attach Schedule 3 to your 2018 Form 1040. You must file Schedule 3 if claiming any nonrefundable credits other than the child tax credit or credit for other dependents. The child tax credit and credit for other dependents are claimed directly on Form 1040, line 12a, without using Schedule 3.
Schedule 3 is required if you paid foreign income taxes, incurred work-related child or dependent care expenses, paid qualified education expenses, made retirement contributions eligible for the Saver’s Credit, installed qualifying energy-efficient home improvements, or claimed general business credits or prior-year minimum tax credits.
Step 2: Gather Documentation and Complete Supporting Forms
Before completing Schedule 3, ensure that you have prepared all required supporting forms. Your return must include specific documentation and calculation forms for each credit. Missing supporting forms result in credit disallowance or significant processing delays.
Prepare Form 1116 for a foreign tax credit if you paid income taxes to foreign countries. Simplified provisions may allow a direct credit claim without Form 1116 under specific conditions.
Fill out Form 2441 for the child and dependent care credit. This form should include the names, addresses, and taxpayer identification numbers of the people who provided care, as well as the names and addresses of all qualifying individuals and the costs that were incurred.
Prepare Form 8863 for education credits, providing student information, institutional employer identification numbers, and qualified education expenses—complete Form 8880 for retirement savings contributions credit, documenting IRA and employer plan contributions.
Prepare Form 5695 for residential energy credits, detailing qualifying energy-saving improvements along with their associated costs and dates. Complete Form 3800 for general business credits if operating a business. Prepare Form 8801 for credit for the prior year's minimum tax if you paid an alternative minimum tax in previous years.
Step 3: Enter Identification Information
Write your name exactly as shown on Form 1040 in the designated space at the top of Schedule 3. For joint returns, include both spouses’ names. Enter your Social Security number in the provided field. Accurate identification ensures that Schedule 3 is appropriately matched to your return throughout the IRS processing systems.
Step 4: Report Foreign Tax Credit
Enter the foreign tax credit amount on line 48 from Form 1116. If you qualify for simplified reporting, enter the foreign taxes paid or accrued directly, without using Form 1116. The foreign tax credit reduces U.S. tax liability by the income taxes paid to foreign governments on foreign-source income.
The credit is subject to limitation formulas preventing it from reducing tax on U.S.-source income. You must calculate the foreign tax credit limitation using complex formulas that separate foreign-source income by category. Maintain detailed records of foreign taxes paid, foreign-source income calculations, and all supporting documentation for IRS verification.
Step 5: Report Child and Dependent Care Credit
Enter the child and dependent care credit from Form 2441, line 11, on line 49. This credit reduces tax based on amounts paid for qualifying care, enabling you to work or actively seek employment. Expenses are limited to $3,000 for one qualifying person or $6,000 for two or more qualifying individuals.
The credit percentage ranges from 20% to 35% of qualifying expenses, based on adjusted gross income, with higher earners receiving lower percentages. Reduce claimed expenses by any dependent care benefits received from employer-provided programs. Qualifying individuals include children under age 13, disabled spouses unable to care for themselves, and other dependents physically or mentally incapable of self-care.
Step 6: Report Education Credits
Enter education credits from Form 8863, line 19, on line 50. This line captures only nonrefundable education credit amounts. Two education credits are available for 2018: the American Opportunity Credit and the Lifetime Learning Credit.
The American Opportunity Credit provides up to $2,500 per eligible student for the first four years of post-secondary education. The student must be enrolled at least half-time in a degree or credential program. Of the maximum $2,500 credit, $1,000 is refundable and reported on Form 1040, not Schedule 3. The credit phases out for modified adjusted gross income between $80,000 and $90,000 for single filers or $160,000 and $180,000 for married couples filing jointly.
The Lifetime Learning Credit provides up to $2,000 per tax return for any post-secondary education or skills development. No enrollment status requirement applies, making it suitable for graduate students and part-time learners. The credit is entirely nonrefundable. The same income phase-out ranges apply as the American Opportunity Credit. You cannot claim both credits for the same student in the same year. Qualified expenses include tuition, required fees, and course materials necessary for enrollment. Room and board do not qualify.
Step 7: Report Retirement Savings Contributions Credit
Enter the retirement savings contributions credit from Form 8880, line 12, on line 51. The Saver’s Credit encourages retirement savings for lower- and moderate-income taxpayers, providing up to $1,000 for individuals or $2,000 for married couples filing jointly.
Qualifying contributions include amounts paid to traditional IRAs, Roth IRAs, 401(k) plans, 403(b) plans, governmental 457 plans, SIMPLE plans, SEP plans, and ABLE accounts for eligible individuals. The credit percentage ranges from 10% to 50% of qualifying contributions, based on adjusted gross income.
For 2018, you cannot claim the credit if your adjusted gross income exceeds $31,500 for single filers, $47,250 for head of household, or $63,000 for married filing jointly. The credit is nonrefundable and cannot exceed your tax liability. Contributions must be made by the return due date, including extensions.
Step 8: Leave Line 52 Blank
Line 52 is reserved for future use. Do not enter any amount on this line. The IRS reserves line numbers to accommodate potential new credits or the reorganization of existing credits without requiring a complete form redesign. Skip this line when completing Schedule 3.
Step 9: Report Residential Energy Credits
Enter residential energy credits from Form 5695 on line 53. Two distinct credit programs apply. The residential energy-efficient property credit provides credits for qualifying expenditures on solar electric property, solar water heating property, small wind energy property, geothermal heat pump property, and fuel cell property installed at your principal residence.
Credit percentages vary by property type. Solar electric, solar water heating, slight wind, and geothermal heat pump systems are eligible for a 30 percent tax credit on costs. Fuel cell properties qualify for a 30 percent tax credit, with a $500 per half-kilowatt capacity limitation. You must install these improvements at your existing or under-construction home, which will serve as your primary residence.
The energy property credit for nonbusiness use covers qualifying improvements, including insulation, exterior doors and windows, roofs, central air conditioners, natural gas water heaters, and biomass fuel stoves. This credit has a lifetime aggregate limit of $500 across all years, with a $200 sublimit for windows. Most taxpayers reached this lifetime limit in prior years, making this credit unavailable for 2018.
Step 10: Report Other Credits and Calculate Total
Enter other nonrefundable credits on line 54. Common credits include general business credit from Form 3800, which aggregates multiple individual business credits, and credit for prior year minimum tax from Form 8801, allowing recovery of alternative minimum tax paid in earlier years.
The general business credit combines various credits, including the Work Opportunity Credit, Disabled Access Credit, Small Employer Health Insurance Credit, Employer-Provided Childcare Credit, and numerous specialized business credits. These credits are subject to tax liability limitations calculated on Form 3800.
The minimum tax credit from the previous year applies only to alternative minimum tax attributable to timing differences rather than permanent exclusions. Form 8801 calculates the allowable credit and any carryforward to future years.
Write the form number or description next to any amount entered on line 54 to identify the credit source. Add all amounts from lines 48 through 54 and enter the total on line 55. Verify calculations are accurate with properly positioned decimal points. This total represents your nonrefundable credits from Schedule 3.
Transfer to Form 1040 and Filing Requirements
Transfer Schedule 3, line 55, total, to Form 1040, line 12b. This amount, combined with the child tax credit and credit for other dependents from line 12a, determines the total nonrefundable credits on line 12c, which reduce tax liability on line 13.
Attach Schedule 3 to Form 1040 as Attachment Sequence No. 03. Include all supporting forms in proper order: the following: Form 1116, Form 2441, Form 8863, Form 8880, Form 5695, Form 3800, Form 8801, and any other relevant forms behind Schedule 3.
Sign and date Form 1040. Both spouses must sign joint returns. For paper filing, mail the complete package to the appropriate IRS service center address for your state. Electronic filing through IRS e-file provides faster processing, automatic calculation verification, and immediate acknowledgment. Maintain all documentation supporting credits for at least three years after the filing date. The IRS may request verification during examination.
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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.
