"2027" here means the 2027 filing season, which covers a tax year 2026 return. The forms for 2026 were still drafts, not for filing, when this was written, so confirm line numbers against the final IRS versions before you file.
This guide covers eligibility, qualified expenses, Form 8839, the refundable split, and what Australia-based U.S. taxpayers should watch for.
Key Takeaways
- Form 8839 calculates the credit; only the nonrefundable amount goes to Schedule 3 Line 6c.
- The refundable portion goes directly to Form 1040 line 30 (per the 2026 draft).
- Final 2026 IRS forms and instructions control your 2027 filing.
- Eligibility turns on the child, expenses, filing status, timing, and MAGI.
- Keep decrees, receipts, bank records, and prior-year Forms 8839.
What Schedule 3 Line 6c Means
What is Schedule 3 of Form 1040?
Schedule 3 reports additional credits and payments that flow into Form 1040. Part I covers nonrefundable credits. Part II covers other payments and refundable credits.
Where does the adoption credit appear?
Based on the 2026 drafts, the chain looks like this:
| Item | Path |
|---|---|
| Nonrefundable adoption credit | Form 8839 line 18a → Schedule 3, Part I, line 6c |
| Part I total | Schedule 3 line 8 → Form 1040 line 20 |
| Refundable adoption credit | Form 8839 line 13 → Form 1040 line 30 directly |
Don't assume last year's line numbers hold. Form 8839 changes line 18 to 18a for 2026 and adds 18b for carryforward to 2027.
What Line 6c does not mean
Line 6c is not your total adoption spending. It isn't automatically the full credit, and it isn't the refundable portion.
You can have a larger credit on Form 8839 and still report less on Line 6c. The reasons include:
- Limited tax liability
- The income phaseout
- Amounts claimed in prior years
- Carryforward rules
2027 Filing Season Eligibility and 2026 Credit Rules
Tax year 2026 versus the 2027 filing year
Use "tax year 2026" for credit rules and "2027 filing season" for when you file. Confirm the 2027 filing season opening date on IRS.gov; it may not be posted yet.
The official 2026 figures come from Rev. Proc. 2025-32:
| 2026 item | Figure |
|---|---|
| Maximum credit per eligible child | $17,670 |
| Refundable limit (within the total) | $5,120 per child |
| MAGI phaseout begins | Over $265,080 |
| Fully phased out | $305,080 or more |
The refundable portion exists because of the 2025 budget law, Public Law 119-21, which added partial refundability. Tribal governments can now make special-needs determinations alongside states.
Who may qualify
- The child is under 18, or physically or mentally unable to self-care.
- Married taxpayers generally must file jointly.
- Legally separated taxpayers may count as unmarried.
- Spouses living apart the last six months may qualify if the child lived with you more than half the year and you paid more than half the home's upkeep.
Qualified expenses and limits
The credit rests on qualified expenses up to the per-child limit. Expenses already used for the same child in earlier years reduce what's left, because the ceiling doesn't renew annually. Refundability is calculated per child. Using more than three children means extra Forms 8839, with combined totals on one form only.
MAGI phaseout
Adoption MAGI isn't just AGI. Per the Form 8839 instructions, add back:
- Puerto Rico excluded income
- Form 2555 lines 45 and 50 (foreign earned income, housing exclusions, and housing deduction)
- Form 4563 line 15 (American Samoa)
Here is a hypothetical. Say MAGI is $285,080, which is halfway through the $40,000 band. The credit is cut by half, so a $17,670 credit drops to about $8,835. Treat this as an illustration only and use the Form 8839 worksheet for real numbers.
How Form 8839 Feeds Schedule 3 Line 6c
Part I: Identify each child
Part I collects each child's details:
- Identifying number (SSN, ATIN, or ITIN)
- Birth year
- Foreign-adoption status
- Special-needs status
- Whether the adoption is final
An ATIN is a temporary number requested on Form W-7A when the SSN can't be obtained yet. Request an ITIN on Form W-7.
Part III: Employer-provided assistance
If your employer helped pay adoption costs, complete Part III first. The same expense can't support both the tax-free exclusion and the credit.
IRS example: $20,000 in expenses includes $8,000 of employer-reimbursed legal fees. The credit expense base becomes $12,000.
Part II: Calculate the credit
Work through these steps:
- Enter qualified expenses, applying the special-needs rule if relevant.
- Apply the MAGI phaseout.
- Account for prior claims and employer benefits.
- Determine the total allowable credit.
Use final 2026 line references, since drafts and prior-year forms differ.
Split into refundable and nonrefundable
The refundable portion can boost your refund even with little or no tax liability. The nonrefundable portion only reduces tax down to your liability.
Worked example: A $17,670 credit splits into $5,120 refundable and $12,550 nonrefundable.
- $12,550 (if tax liability allows) goes to Schedule 3 Line 6c
- $5,120 goes to Form 1040 line 30
- Anything the liability can't absorb carries forward
Carryforward of unused nonrefundable credit
Unused nonrefundable credit carries forward up to five years. It never becomes refundable later. Reconcile it with prior-year Forms 8839 and the carryforward worksheets. A 2025-only transition may have adjusted older carryforwards, and that treatment doesn't extend to 2026.
Final reporting checklist
- Attach Form 8839.
- Enter the nonrefundable amount on Schedule 3 Line 6c.
- Carry the Schedule 3 total to the designated Form 1040 line.
- Report any refundable amount separately.
- Cross-check against the final 2026 forms and instructions.
Qualified Expenses, Timing, and Special Adoption Situations
Expenses that generally qualify
Reasonable and necessary adoption fees, attorney fees, court costs, travel, and other costs directly tied to the legal adoption qualify. For travel, note dates, destinations, amounts, and the link to the adoption. If you paid in Australian dollars, keep currency and exchange-rate records.
Expenses that generally don't qualify
- Adopting your spouse's child
- Surrogate-parenting arrangements
- Expenses used for another federal credit or deduction
- Government-paid or employer-reimbursed amounts
- Expenses that violate state or federal law
When the credit is claimed
Domestic or foreign status depends on the child's U.S. citizenship or residency when adoption efforts began.
| Situation | Timing |
|---|---|
| Domestic, paid before finalization year | Generally the year after payment |
| Domestic, paid in finalization year | That year |
| Domestic, paid after finalization | Payment year |
| Domestic, unsuccessful | Can still qualify |
| Foreign, before or during finalization year | Finalization year; nothing earlier |
| Foreign, after finalization year | Payment year |
Failed foreign adoptions are treated differently from failed domestic ones, so check the final instructions.
Special-needs adoptions
All three must be true:
- The child was a U.S. citizen or resident when adoption efforts began.
- A state or tribal government determined the child can't or shouldn't return to the parents' home.
- That government determined adoption won't happen without assistance.
A formal determination is required. A medical condition or an agency's description isn't enough. Keep the assistance agreement, agency or tribal certification, or an official government letter.
Australia-Based Filing Checklist and Common Mistakes
Issues for U.S. taxpayers living in Australia
U.S. citizens and resident aliens living in Australia still generally file U.S. returns on worldwide income. You may qualify for an automatic two-month extension to June 15, with interest running from the regular due date.
Two tools affect the adoption credit calculation:
- Foreign Earned Income Exclusion: The 2026 maximum is $132,900, but excluded amounts are added back to adoption MAGI.
- Foreign Tax Credit (Form 1116): Generally limited to the lower of eligible foreign tax or allocated U.S. tax on foreign income.
Handle Australian tax rules separately; they sit outside this U.S. filing guide.
Foreign-currency and cross-border records
Report in U.S. dollars. Convert Australian dollar expenses at the rate when paid or accrued, using a consistently applied, documented method. Confirm the AUD rate on the IRS yearly-average exchange-rate table for your tax year.
Collect:
- Invoices, receipts, and bank or card statements
- The adoption decree and court documents
- Foreign income documents, plus Form 2555 or 1116 details
- Prior Forms 8839
Mistakes to avoid and when to seek help
- Confusing tax year 2026 with filing year 2027
- Entering the total credit on Line 6c instead of the nonrefundable amount
- Overlooking the refundable portion
- Double-counting employer assistance
- Failing to track carryforwards
Australia-based taxpayers with cross-border U.S. questions can consider VJM Global, which serves clients across Australia and provides tax, accounting, and advisory support, including Form 1040 preparation.
Frequently Asked Questions
What is the maximum adoption credit for 2026?
Per Rev. Proc. 2025-32: $17,670 per eligible child, up to $5,120 refundable. MAGI phaseout runs from over $265,080 to $305,080.
What is Schedule 3 Form 1040?
It's the additional credits and payments schedule attached to Form 1040. Part I lists nonrefundable credits, including the adoption credit.
Where can I find my 1040 Schedule 3?
Current forms and instructions are on IRS.gov. In a filed return, look for Schedule 3 behind Form 1040, in your printed or e-filed PDF.
How does the adoption credit get reported on Line 6c?
Form 8839 calculates the credit. The allowable nonrefundable amount goes to Line 6c, and Schedule 3 totals then flow to Form 1040.
Is the credit on Line 6c refundable?
No, Line 6c is the nonrefundable part. Per the 2026 draft, the refundable part goes to Form 1040 line 30.
Do I need Form 8839?
Yes, it's the form used to calculate and claim the credit. Attach it to your return, including a paper return.
