Form 8812 (Schedule 8812) Tax Year 2021—IRS-Accurate Paper-Filing Checklist
Year Attributes: 2021-Specific Rules
2021 is uniquely governed by the American Rescue Plan Act (ARPA). The Schedule 8812 instructions became the single authoritative source for calculating the child tax credit (Publication 972 was discontinued). Enhanced credit amounts apply: $3,600 per child under the age of 6; $3,000 per child aged 6–17. Advance Child Tax Credit payments issued from July to December 2021 must be reconciled on Schedule 8812; repayment protection applies only to lower-income filers.
Form Attributes: Schedule 8812 Limitations
Schedule 8812 cannot be filed if the taxpayer files Form 2555 (foreign earned income exclusion); the Additional Child Tax Credit is prohibited in that case. Nonresidents filing Form 1040-NR must satisfy U.S. residency or Puerto Rico bona fide residence tests to access refundable credits. Credits are limited to the taxpayer’s tax liability; if liability is zero or negative, only refundable portions may produce a refund (subject to earned income thresholds).
Sections Redesigned for 2021
Part I Structure
2020 Rule: Child Tax Credit calculated via worksheet in Publication 972.
2021 Rule: Calculations integrated into Schedule 8812 Part I-A, Part I-B, Part I-C.
Change Type: Redesigned
Line 4b
2020 Rule: Tracked children age 17
2021 Rule: The age threshold changed to under age 18; a separate count is required for children under age 6.
Change Type: Updated.
Line 13 Checkboxes
2020 Rule: Single residency test
2021 Rule: Box A (U.S. principal place of abode more than 6 months) and Box B (Puerto Rico bona fide residence) drive different calculation paths
Change Type: Added
Line 14f / Line 15e
2020 Rule: Not present
2021 Rule: Advance Child Tax Credit Payments from Letter 6419 reconciliation is now required.
Change Type: Added
Part III (Lines 28–40)
2020 Rule: Not applicable
2021 Rule: Excess advance payment calculation and repayment protection threshold determination.
Change Type: Added.
Ten-Step 2021 Checklist for Schedule 8812
Step 1: Verify Eligibility and Residency
Confirm principal place of abode in the United States for more than half of 2021 (Box A) or bona fide residence in Puerto Rico for the entire year (Box B). If neither box applies, proceed to Part I-C only. Nonresidents (Form 1040-NR filers) cannot claim refundable credits unless they meet the residency threshold.
Step 2: Gather Letter 6419 and W-2 Forms
Obtain Letter 6419 from the IRS for each spouse if married filing jointly; each letter reports total advance child tax credit payments received and the number of qualifying children. Collect all W-2 forms; Part II calculations require earned income from Box 1 or wages plus nontaxable combat pay (if applicable).
Step 3: List Qualifying Children and Determine Ages
Enter the count of children under age 18 at the end of 2021 with the required Social Security number on line 4a. On line 4b, enter the count of those children under age six at the end of 2021. Verify that each child was under the age of 18 on December 31, 2021 (even if they turn 18 on December 30, the child does not qualify).
Step 4: Calculate Modified Adjusted Gross Income (MAGI)
Begin with line 11 from Form 1040, 1040-SR, or 1040-NR. Add back foreign-earned income from Form 2555 (lines 45, 50) if applicable. Add income excluded from Puerto Rico or American Samoa sources if applicable. Record result on Schedule 8812 line 3; this determines phase-out reduction.
Step 5: Determine Phase-Out Reduction Using Thresholds
If MAGI exceeds $400,000 (MFJ) or $200,000 (all other statuses), calculate phase-out. The first step reduces credit to $2,000 per child if the MAGI exceeds $150,000 (MFJ/QW), $112,500 (HOH), or $75,000 (single/MFS). The second step reduces to below $2,000 per child if the MAGI exceeds $400,000 (MFJ) or $200,000 (all others). Reduce by $50 for each $1,000 (or fraction thereof) over applicable threshold.
Step 6: Calculate Child Tax Credit and Credit for Other Dependents (Part I)
Multiply line 4a by the enhanced credit amounts for 2021: $3,600 per child under age 6 (line 4b) and $3,000 per child age 6 through 17 (calculated as line 4a minus line 4b), as determined in the Line 5 Worksheet. These amounts are explicitly stated in the Schedule 8812 instructions and IRS publications for tax year 2021. Multiply line 6 (other dependents, including children age 18 or older and other relatives) by $500—sum on line 8. Apply phase-out reduction from Step 5—record results per Parts I-A, I-B, or I-C based on line 13 checkbox selections.
Step 7: Reconcile Advance Child Tax Credit Payments
On line 14f (Part I-B) or line 15e (Part I-C), enter total advance payments received from Letter 6419. If married filing jointly, add amounts from both Letters 6419. Compare line 14f or 15e with line 14g or 15d (total CTC claimed). If the received amount exceeds the eligible amount, proceed to Part III to calculate the repayment obligation.
Step 8: Calculate Additional Child Tax Credit (Part II-A, II-B, II-C)
Complete Part II only if line 4a is more than zero, Form 2555 is not filed, and line 12 exceeds line 15a. On line 18a, enter earned income. If earned income exceeds $2,500, calculate 15% of the excess amount (line 19 × 0.15 = line 20). Additional credit is limited to the lesser of line 17 or line 20 (or alternative calculation under Part II-B if three or more qualifying children). Enter the final additional child tax credit from line 27 on Form 1040, 1040-SR, or 1040-NR line 28.
Step 9: Determine Repayment Obligation (Part III)
Calculate excess advance payments on line 29 (line 28a minus line 28b). If the amount is zero or negative, no additional tax is owed; stop here. If positive, proceed with repayment calculation. Enter the number of qualifying children claimed for 2021 on line 31; enter the number reported on Letter 6419 on line 30. The difference equals excess children. Multiply excess children by $2,000 (line 32 × $2,000 = line 37) to determine maximum repayment protection owed.
Step 10: Apply Repayment Protection If Eligible (2021 Only)
If MAGI at line 3 is at or below $60,000 (MFJ/QW), $50,000 (HOH), or $40,000 (single/MFS), complete repayment protection applies; excess children owe $2,000 each. If MAGI exceeds the cap, repayment protection phases out by 5% for each $1,000 (or fraction) over the threshold until it is eliminated at $120,000 (MFJ/QW), $100,000 (HOH), or $80,000 (single/MFS). Enter repayment protection amount on line 38; subtract from line 37 to calculate additional tax owed on line 40 (enter on Form 1040, 1040-SR, or 1040-NR Schedule 2, line 4). Attach completed Schedule 8812 to Form 1040, 1040-SR, or 1040-NR before mailing.
Required Documents and Attachments
Attach Schedule 8812 to Form 1040, 1040-SR, or 1040-NR. Include all Letters(s) 6419 received. If claiming credit after prior disallowance, attach Form 8862 (Information To Claim Certain Credits After Disallowance). If a child was born and died in 2021 with no Social Security Number, attach the birth certificate, death certificate, or hospital records showing the child was born alive. Preserve all W-2 forms and nontaxable combat pay documentation.
Key Limitation: Form 2555 Filers
If Form 2555 (Foreign Earned Income Exclusion) is filed, do NOT complete Parts II-A, II-B, or II-C of Schedule 8812. The Additional Child Tax Credit cannot be claimed. Only the nonrefundable Child Tax Credit remains available (limited to tax liability). This restriction applies regardless of earned income, number of children, or residency status.
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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.
