IRS Form 1040 Schedule 2 (Form 1040S2) For Tax Year 2021: Compliance Checklist
2021 Form 1040s2 Unique Characteristics
Form 1040 Schedule 2 for 2021 became essential for reporting multiple additional tax categories expanded under the American Rescue Plan Act of 2021 (ARPA), including premium tax credit reconciliation adjustments and alternative minimum tax, both of which require Form 1040 Schedule 2 to be appropriately integrated into the total tax liability calculation on Form 1040, 1040-SR, or 1040-NR.
Year-Specific Programs Applying to 2021 Schedule 2
The 2021 tax year introduced temporary expansions of the Child Tax Credit (reaching $3,600 for children under age six and $3,000 for children ages 6-17), requiring Schedule 8812 reconciliation if advance payments were received, with reconciliation amounts reported to Schedule 2, Line 19.
Premium Tax Credit expansions under ARPA eliminated the 400-percent Federal Poverty Line income cap for 2021, affecting advance payments that require reconciliation on Form 8962, then transferred to Schedule 2, Line 2. The Section 965 net tax liability installment (from Form 965-A) continues as a component of Schedule 2, Line 20 for 2021.
10-Step Compliance Checklist for Form 1040s2 (2021)
Step 1: Verify Form 1040s2 Is Required
Confirm you must file Schedule 2 with your 2021 tax return: You owe alternative minimum tax (AMT) requiring Form 6251; you received advance payments of the premium tax credit requiring Form 8962 reconciliation; you have self-employment income or household employment taxes; you owe additional Medicare tax or net investment income tax; or you received taxable distributions from IRAs, HSAs, or other tax-favored accounts. Do not file Schedule 2 if you have no such items to report.
Step 2: Gather Required Documents for Part I (Tax)
Collect Form 6251 (if claiming Alternative Minimum Tax) and Form 8962 (if you received advance premium tax credit payments for 2021 marketplace health insurance coverage). Obtain your advance payment notice letter (typically Form 1095-A) showing the total amount of monthly advance premium tax credit payments made on your behalf in 2021.
Step 3: Report Alternative Minimum Tax on Line 1
If you were a high-income taxpayer or received tax-preference items, complete Form 6251 per the 2021 instructions and enter the calculated AMT on Schedule 2, Line 1; attach Form 6251. If no AMT applies, enter zero or leave blank.
Step 4: Report Excess Advance Premium Tax Credit Repayment on Line 2
If you received advance premium tax credit payments in 2021 that exceeded your actual premium tax credit eligibility, complete Form 8962 to calculate the repayment amount and enter it on Schedule 2, Line 2; attach Form 8962. If no excess repayment is owed, enter zero. This reconciliation is mandatory if advance payments were made.
Step 5: Transfer Part I Total to Form 1040, Line 17
Add Lines 1 and 2 on Schedule 2 and enter the total on Schedule 2, Line 3; then transfer this same amount to Form 1040, Form 1040-SR, or Form 1040-NR, Line 17. This amount must be entered regardless of filing status.
Step 6: Report Part II Other Taxes—Self-Employment and Wage Taxes
For Line 4, complete Schedule SE (Self-Employment Tax) and enter the amount; attach Schedule SE.
For Line 5, if you received unreported tip income, complete Form 4137 and enter the Social Security and Medicare tax owed; attach Form 4137.
For Line 6, if your employer did not withhold Social Security or Medicare tax on wages, complete Form 8919 and enter the uncollected tax amount; attach Form 8919.
Add Lines 5 and 6 and enter the total on Line 7.
Step 7: Report Tax-Favored Account and Household Employment Taxes
For Line 8, if you received early distributions from IRAs, Roth IRAs, SEP-IRAs, SIMPLE IRAs, Coverdell ESAs, qualified tuition programs, Archer MSAs, Medicare Advantage MSAs, or HSAs, complete Form 5329 and enter additional taxes; attach Form 5329 if required.
For Line 9, if you employed a household worker (nanny, housekeeper, or other household employee) in 2021 and paid cash wages of $2,300 or more (threshold for 2021), complete Schedule H and enter household employment taxes; attach Schedule H.
Step 8: Report Homebuyer Credit and Other Specific Tax Items
For Line 10, if you claimed the first-time homebuyer credit in 2008 and are still in the 15-year repayment period (through 2024), you must repay at least one-fifteenth of the credit with your 2021 return; complete Form 5405 if the home was sold or ceased to be your principal residence in 2021, or simply enter the minimum annual repayment if you continued to use the home as your principal residence; attach Form 5405 only if home disposition occurred.
For Lines 11–12, if you owed Additional Medicare Tax (0.9 percent on wages over $200,000 for single filers, $250,000 for married filing jointly), complete Form 8959; if you had net investment income over thresholds, complete Form 8960.
For Lines 13–16, report uncollected RRTA tax on tips or group-term life insurance (from Form W-2, Box 12), interest on installment income from sales of sure residential lots, and recapture of low-income housing credit (Form 8611).
Step 9: Report Other Additional Taxes (Lines 17a–17z)
Review all other additional taxes not reported elsewhere: recapture of other credits (specify form and amount); recapture of federal mortgage subsidy (if you sold your home in 2021); additional tax on HSA distributions or if you did not remain an eligible individual (Form 8889); additional tax on Archer MSA or Medicare Advantage MSA distributions (Form 8853); recapture of charitable contribution deduction for fractional interests in tangible personal property; income from nonqualified deferred compensation plans failing to meet IRC Section 409A requirements; compensation from Section 457A plans; Section 72(m)(5) excess benefits tax; golden parachute payments; tax on accumulation distributions of trusts; excise tax on insider stock compensation from expatriated corporations; look-back interest under IRC Sections 167(g) or 460(b) (Form 8697 or 8866); tax on non-effectively connected income for nonresident aliens (Form 1040-NR); and interest from Form 8621 relating to Section 1291 funds. List each by type and form, entering amounts on the appropriate lines. Add all these items and enter the total on Line 18.
Step 10: Calculate Total Other Taxes and Transfer to Form 1040
For Line 19, enter any additional tax from Schedule 8812 related to child tax credit reconciliation (if applicable).
For Line 20, if you had a Section 965 net tax liability from prior-year foreign corporation earnings and are making installment payments, complete Form 965-A and enter the current-year installment amount.
Add Lines 4, 7 through 16, 18, and 19; enter the total on Schedule 2, Line 21. Line 20 is reported separately and not included in this sum.
Transfer this amount to Form 1040, Form 1040-SR, or Form 1040-NR, Line 23. Attach the completed Schedule 2 to your Form 1040, 1040-SR, or 1040-NR; ensure all required supporting forms (6251, 8962, 5329, Schedule SE, Schedule H, Forms 4137, 8919, 5405, 8959, 8960, 8611, 8889, 8853, 965-A, etc.) are also attached. Sign and date the Form 1040 as the filing signature covers all schedules.
Form 1040s2 Restrictions and Limitations (2021)
Nonresident and Dual-Status Alien Filers: Nonresident aliens filing Form 1040-NR must use Schedule 2 to report self-employment tax, additional Medicare tax, net investment income tax, alternative minimum tax, and certain other taxes. Certain credits, such as the earned income credit and the child tax credit, are unavailable to nonresident aliens. Dual-status aliens must follow resident alien rules for Schedule 2 reporting if they elected to be taxed as residents.
First-Time Homebuyer Credit—Repayment Limitation: Only taxpayers who claimed the first-time homebuyer credit in 2008 are subject to repayment on Schedule 2, Line 10; the 15-year repayment period runs from 2008 through 2024; repayment is waived if the home was condemned or destroyed in 2021, or if the taxpayer died before selling the house. Married taxpayers filing separately who both claimed the credit must each file a separate Form 5405 to report their proportionate share of the repayment.
Section 965 Installment Elections: Taxpayers with Section 965 net tax liability from 2017 foreign corporation earnings may elect to pay in eight installments (years 1–8); in 2021, only the 2017 liability may still be outstanding; no new 2021 Section 965 inclusions apply (Section 965 was effective for the 2017 tax year only).
Notable Changes or Redesigns for 2021 Schedule 2 Form
Part I Structure: Previously consolidated lines for AMT and premium tax credit on separate lines. Lines 1 and 2 now clearly label Alternative Minimum Tax and Excess Advance Premium Tax Credit Repayment with explicit form attachments. Change type: Clarified.
Line 19: Referenced “Additional child tax credit from Form 8812.” Now specifies “Additional tax from Schedule 8812” to include refundable credits and reconciliation. Change type: Updated.
Supporting Forms Reference: Instructions listed forms without section cites. Two thousand twenty-one instructions explicitly link each line to specific IRS forms with required attachments (Form 6251, 8962, 5329, 8959, 8960, etc.). Change type: Clarified.
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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.
