Business Entities · Corporations in general

Corporate minimum tax credit

The corporate minimum tax credit exists to make the corporate alternative minimum tax a timing provision rather than a permanent one: a corporation that pays minimum tax in a year when its book income exceeds its taxable income gets the money back in a later year when the relationship reverses. Almost no corporation is inside the regime — the entry threshold is a billion dollars of book income — but the credit machinery is examinable because it explains what the minimum tax is for, and because the provision that produces it now has two entirely different versions living in the same section.

The rule

The credit. a credit is allowed against the chapter 1 tax for any taxable year equal to the minimum tax credit for that year, which is the excess of the adjusted net minimum tax imposed for all prior taxable years beginning after 1986 over the amount already allowed as a credit for those years (IRC § 53(a), (b))^TY2026

Its ceiling. the credit for a taxable year may not exceed the excess of the regular tax liability, reduced by the credits allowable under subparts A, B, D, E and F, over the tentative minimum tax for that year — so it can be used only to the extent the regular tax exceeds the tentative minimum tax (IRC § 53(c))^TY2026

The corporate version. for a corporation, IRC § 53(b)(1) is applied by substituting the net minimum tax for all prior taxable years beginning after 2022 for the adjusted net minimum tax imposed for all prior years beginning after 1986, and the regular tax figure in § 53(c)(1) is increased by the IRC § 59A tax for the year (IRC § 53(e))^TY2026

The tax that generates it. a tax is imposed, in addition to any other tax imposed by subtitle A, equal to the excess of the tentative minimum tax for the year over the regular tax for the year plus, in the case of an applicable corporation, the tax imposed by IRC § 59A (IRC § 55(a))^TY2026

What the tentative minimum tax is. 15 percent — for an applicable corporation the tentative minimum tax is the excess of that percentage of adjusted financial statement income for the year, as determined under IRC § 56A, over the corporate alternative minimum tax foreign tax credit. For any corporation that is not an applicable corporation the tentative minimum tax is zero (IRC § 55(b)(2))^TY2026

Who is inside the regime. $1,000,000,000 — an applicable corporation is any corporation other than an S corporation, a regulated investment company or a real estate investment trust that meets the average annual adjusted financial statement income test for one or more taxable years prior to the year in question and ending after 31 December 2021; the test is met where average annual adjusted financial statement income, determined without regard to IRC § 56A(d), for the 3-taxable-year period ending with that year exceeds that amount (IRC § 59(k)(1))^TY2026

And why leaving is hard. the applicable corporation test looks at whether the income test was met in any prior year ending after 31 December 2021, so a corporation that once qualifies remains an applicable corporation in later years even if its income falls — the status is not re-tested annually from scratch (IRC § 59(k)(1)(A))^TY2026

Current figures

How it works in practice

Begin with the sentence that disposes of almost every corporation: for a corporation that is not an applicable corporation, the tentative minimum tax for the year is zero. Not a small number, not a computation that usually produces nothing — zero, by statute. That has two consequences. Such a corporation can never owe minimum tax, because IRC § 55(a) imposes the tax only on the excess of the tentative minimum tax over the regular tax. And the IRC § 53(c) limitation, which caps the credit at the excess of regular tax over tentative minimum tax, is unconstrained for it.

Getting inside the regime requires the average annual adjusted financial statement income test: more than a billion dollars of average adjusted financial statement income over the three-year period ending with the year in question. Note the two things that make this test harder to escape than to meet. It is measured on book income, computed under IRC § 56A rather than under the ordinary tax rules. And under IRC § 59(k)(1)(A) a corporation is an applicable corporation if it met the test for one or more taxable years prior to the year in question ending after 31 December 2021 — so the status is acquired once and carried forward, rather than re-tested from scratch each year. A corporation whose book income falls below the threshold does not automatically leave the regime.

The credit itself is straightforward once the tax exists. Minimum tax paid in earlier years accumulates, and in a later year the corporation may claim it against its regular tax to the extent the regular tax exceeds that year’s tentative minimum tax. There is no expiry: the credit carries forward indefinitely until used (IRC § 53(b)). So the minimum tax is, over the life of the corporation, a prepayment rather than an additional charge — provided the corporation eventually has years in which regular tax exceeds tentative minimum tax.

IRC § 53(e) makes two adjustments for corporations that repay careful reading. First, it substitutes “the net minimum tax for all prior taxable years beginning after 2022” for the general reference to years beginning after 1986. That date is the start of the current corporate regime, and it means a corporation’s credit pool under the current rules begins in 2023 — pre-2018 corporate minimum tax credits belong to a different regime that was refunded and closed out. Second, the regular tax figure in the limitation is increased by the base erosion tax for the year, which enlarges the room available for the credit.

Note what the credit is not. It is not a credit against the minimum tax; it is a credit against the regular tax in a later year. And it does not reduce the minimum tax when paid — the corporation pays in full and recovers later, which is why the provision is a timing measure and why a corporation permanently in a book-over-tax position never recovers anything.

Scenarios

How this has changed

There have been two corporate alternative minimum taxes and they have almost nothing in common except the section number.

The first ran from 1987 and was built on tax-based adjustments and preferences — accelerated depreciation, percentage depletion, and an adjustment by reference to adjusted current earnings. It was repealed for taxable years beginning after 2017, and the credits it had generated were made refundable over a transitional period and then closed out. Material describing corporate minimum tax by reference to adjusted current earnings or to a list of preference items is describing that repealed regime.

The current one applies for taxable years beginning after 2022 and is built on something else entirely: financial statement income, at the rate in IRC § 55(b)(2)(A), for corporations averaging more than a billion dollars of book income over three years. It is a book-income tax wearing the old name, and the substitution in IRC § 53(e)(1) — the credit pool starting in 2023 rather than 1986 — is the seam between the two regimes showing in the statute.

The practical significance for most corporations is that this topic went from something every large-ish corporation had to compute to something almost none of them do. But the compliance consequence recorded under estimated tax remains: IRC § 6655(g)(1) includes the IRC § 55 tax in the definition of tax for estimated payment purposes, and IRC § 6655(e)(2) requires adjusted financial statement income to be annualised, so an applicable corporation projects a book-income measure quarterly.

Exam focus

The single most useful fact is that the tentative minimum tax of a corporation which is not an applicable corporation is zero. Where a question describes an ordinary corporation and asks about the alternative minimum tax, the answer is that it does not apply.

Where the corporation is inside the regime, the credit computation is mechanical: prior minimum tax paid, less credits already taken, capped at the excess of regular tax over this year’s tentative minimum tax, carried forward indefinitely.

Watch for two dates. The applicable corporation test looks at years ending after 31 December 2021; the credit pool under IRC § 53(e)(1) begins with years beginning after 2022. They are not the same date and they are doing different jobs.

Check yourself

1. A corporation with $60,000,000 of adjusted financial statement income computes its regular tax and asks what its tentative minimum tax is.

Answer: zero. IRC § 55(b)(2)(B) provides that in the case of any corporation which is not an applicable corporation the tentative minimum tax for the taxable year is zero, and the corporation is far below the billion-dollar average annual adjusted financial statement income test in IRC § 59(k)(1)(B). It cannot owe tax under IRC § 55(a).

2. An applicable corporation has a minimum tax credit carryforward of $30,000,000. Its regular tax for the year is $52,000,000 and its tentative minimum tax is $45,000,000. How much may it use?

Answer: $7,000,000. IRC § 53(c) limits the credit to the excess of the regular tax liability, reduced by the credits allowable under the specified subparts, over the tentative minimum tax for the year. The unused $23,000,000 carries forward indefinitely under IRC § 53(b).

3. A corporation met the average annual adjusted financial statement income test for 2023 but has not met it since. Is it an applicable corporation for 2026?

Answer: yes, on the face of IRC § 59(k)(1)(A), which defines an applicable corporation as one meeting the income test for one or more taxable years prior to the year in question that end after 31 December 2021. The status attaches on first meeting the test and is not re-tested annually from scratch; a fall in book income does not by itself remove it.

4. What rate applies to an applicable corporation’s adjusted financial statement income in computing its tentative minimum tax?

Answer: 15 percent. IRC § 55(b)(2)(A) makes the tentative minimum tax of an applicable corporation the excess of 15 percent of adjusted financial statement income for the year, determined under IRC § 56A, over the corporate alternative minimum tax foreign tax credit.

5. A corporation carries forward minimum tax credits generated in 2016 under the previous corporate alternative minimum tax. May they be used against its current regular tax under IRC § 53?

Answer: no. IRC § 53(e)(1) applies IRC § 53(b)(1) to a corporation by substituting “the net minimum tax for all prior taxable years beginning after 2022” for the general reference to years beginning after 1986. Credits from the earlier regime, which was repealed for years beginning after 2017, are outside the pool the current section recognises.