17.2 Refundable and Nonrefundable Credits
Key Takeaways
- Nonrefundable credits reduce income tax to zero and stop; refundable credits can create a refund even when no tax remains.
- Apply nonrefundable credits first; leftover nonrefundable credit does not become a refund unless a specific carryover statute says so.
- OBBBA set the child tax credit at $2,200 per qualifying child for 2025 (then indexed); the refundable additional child tax credit is capped — IRS materials put that cap at up to $1,700 depending on earned income.
- EITC is fully refundable and earned-income based; AOTC is 40% refundable; the lifetime learning credit and the dependent care credit are nonrefundable.
- A foreign tax credit is a dollar-for-dollar alternative to deducting the same foreign income taxes — elect one, not both.
17.2 Refundable and Nonrefundable Credits
REG Blueprint Area IV, Group F asks you to recall and define the difference between a refundable and a nonrefundable tax credit. Credits are dollar-for-dollar reductions of tax. They are more powerful than deductions of the same amount because a deduction only reduces the base that the rate schedule hits. Regular tax and NIIT were 17.1; this section is what comes off that tax.
Nonrefundable credits reduce income tax to zero and stop. Unused nonrefundable credit is generally lost unless a specific carryover statute applies — most individual personal credits do not carry. Refundable credits can drive the account below zero and create a refund even if no tax was due. Some credits are partially refundable: a slice behaves as nonrefundable, a slice as refundable.
Order. Apply nonrefundable credits first against regular tax (and, where allowed, against other specified taxes). Only after tax has been reduced do refundable credits apply. Applying refundable credits first, or netting all credits against tax as if they were the same species, is the classic REG error.
Worked — tax $1,200, nonrefundable $2,000, refundable $800.
- Nonrefundable credit uses $1,200 and reduces tax to $0. The leftover $800 of nonrefundable credit does not become a refund.
- Refundable credit of $800 is then allowed in full.
- Result: $0 tax and an $800 refund.
Wrong math: $1,200 − $2,000 − $800 = a $1,600 refund (treats the unused nonrefundable slice as refundable). Also wrong: $0 tax and $0 refund (forgets that refundable credits survive a zero tax).
Child tax credit and the additional child tax credit
The child tax credit (CTC) under IRC §24 is a per-qualifying child credit. A qualifying child for CTC is generally under age 17 at year-end, a U.S. citizen, national, or resident, with a Social Security number, and a qualifying child under the relationship and residency tests in 16.3.
The One Big Beautiful Bill Act (signed July 4, 2025) set the credit at $2,200 per qualifying child for 2025 and made the TCJA-era CTC architecture permanent, with inflation indexing beginning after 2025. For sittings on or after July 1, 2026, that $2,200 statutory figure is the in-scope illustration (1.3). Later-year CPI prints are not a REG recall task.
CTC is partially refundable. The refundable slice is the additional child tax credit (ACTC). IRS and Joint Committee on Taxation summaries for 2025 cap ACTC at up to $1,700 per qualifying child, limited further by 15% of earned income over $2,500. The $1,700 figure has been the inflation-adjusted ACTC cap; treat the structure as tested (partially refundable, earned-income phase-in, a per-child refundable cap) and the $1,700 as the current IRS illustration, not as an invitation to memorize next year's indexed print. Phaseout of the credit itself begins at $200,000 MAGI ($400,000 MFJ) — those MAGI starts were TCJA statutory figures that OBBBA preserved.
A credit for other dependents (often $500) is nonrefundable and covers qualifying relatives and children who age out of CTC (for example, a 17-year-old).
Earned income tax credit
The earned income tax credit (EITC) (IRC §32) is fully refundable. It is a wage-and-self-employment credit: it phases in with earned income, peaks, then phases out as AGI rises. The amount depends on filing status and the number of qualifying children. The dollar tables are inflation-indexed — do not memorize them. REG tests that EITC is refundable and earned-income based, that an investment-income limit can bar it, and that it is claimed on the 1040 (Schedule EIC when children are involved).
Education: AOTC versus LLC
Two mutually exclusive education credits (Form 8863):
| Feature | American opportunity tax credit (AOTC) | Lifetime learning credit (LLC) |
|---|---|---|
| Refundability | Partially refundable — 40% | Nonrefundable |
| Typical statutory illustration | Up to $2,500 per eligible student (100% of first $2,000 of qualified expenses + 25% of the next $2,000) | Up to $2,000 per return (20% of up to $10,000 of qualified expenses) |
| Years | First four tax years of postsecondary; student at least half-time | Any year; courses to acquire or improve job skills; no four-year cap |
| Per | Per student | Per return |
You cannot claim AOTC and LLC for the same student in the same year. MAGI phaseouts exist and are indexed; teach that high MAGI can take the credit away, not this year's cutoff. Room and board are not qualified education expenses for these credits.
Dependent care credit
The credit for household and dependent care services (IRC §21, Form 2441) is nonrefundable. It is for employment-related care of a qualifying child under age 13 (or a disabled dependent or spouse). The credit is a percentage of the lesser of qualifying expenses, the taxpayer's earned income, or the spouse's earned income (if married). A dependent-care flexible spending account exclusion uses the same expenses; you cannot double-count. OBBBA increased the statutory percentage schedule for later years; REG wants nonrefundable + earned-income limited, not a memorized percentage table.
Foreign tax credit versus deduction
A taxpayer who pays or accrues foreign income tax may generally elect a foreign tax credit (IRC §901, Form 1116) or a deduction (IRC §164) for the same taxes, not both. The credit reduces U.S. tax dollar-for-dollar, limited to the U.S. tax on foreign-source income. The deduction only reduces taxable income and is useful only if the taxpayer itemizes (15.3). Conceptually, the credit is usually more valuable at the same dollar of foreign tax. Excess foreign tax credit generally carries back one year and forward ten. This is classification and election, not a full sourcing computation.
| Credit | Refundable? |
|---|---|
| CTC (non-ACTC slice) | Nonrefundable (reduces tax first) |
| ACTC | Refundable, subject to the earned-income / per-child cap |
| Credit for other dependents | Nonrefundable |
| EITC | Fully refundable |
| AOTC | 40% refundable |
| LLC | Nonrefundable |
| Dependent care (§21) | Nonrefundable |
| Foreign tax credit | Nonrefundable (can carry over) |
Regular tax is $1,200. The taxpayer has $2,000 of nonrefundable credits and $800 of refundable credits. What is the net result?
Which statement correctly describes the child tax credit after the One Big Beautiful Bill Act?
How do the American opportunity tax credit and the lifetime learning credit differ in refundability?