Section 6166 – Regulations

The regulations currently applicable to Code section 6166 are:


NOTE: Regulations 20.6166A-1 through 20.6166A-4 were published in 1960 (without the "A") for the statute then designated as section 6166, which had been enacted in 1958. In 1976 a new section 6166 was enacted and the old section 6166 was renumbered section 6166A. The existing regulations were redesignated as shown above (with the "A") to reflect the renumbering of old section 6166 as new section 6166A and were published on July 31, 1980. Current regulation 20.6166-1 was also published on July 31, 1980 to reflect the version of section 6166 that was enacted in 1976.

In 1981 section 6166A was repealed, but the regulations cited above continue to apply to current section 6166 as Congress did not intend to repeal the regulations themselves.

Regulation sections 20.6166A-1 et seq. were drafted many years ago. Even though they are applicable to section 6166 existing today, they must be used with caution because of the statutory changes that have been made to section 6166 since 1980. Any provision within the 6166A regulations that is inconsistent with the statute existing today has no effect. See e.g. PLR 200613020. Reading the 6166A regulations can be misleading without this knowledge. The comments below provide some examples.


Section 6166(j), Comment 1:   Reg. §20.6166A-2(a)(3)(c) provides:
(c) Carrying on a trade or business. (1) In order for the interest in a partnership or the stock of a corporation to qualify as an interest in a closely held business it is necessary that the partnership or the corporation be engaged in carrying on a trade or business at the time of the decedent's death. However, it is not necessary that all the assets of the partnership or the corporation be utilized in the carrying on of the trade or business.
Section 6166(b)(9) was enacted in 1984. It is captioned Deferral not available for passive assets, which is defined in §6166(b)(9)(B)(i) as "any asset other than an asset used in carrying on a trade or business." This new statutory provision in 1984 renders inapplicable the portion of Reg. §20.6166A-2(a)(3)(c) providing that it is not necessary that all of the assets of a closely held business be used in the carrying on of a trade or business.
Section 6166(b)(9)(A) provides:
(9) Deferral not available for passive assets
(A) In general
For purposes of subsection (a)(1) and determining the closely held business amount (but not for purposes of subsection (g)), the value of any interest in a closely held business shall not include the value of that portion of such interest which is attributable to passive assets held by the business.
Section 6166(b)(9)(B)(i) provides:
(B) Passive asset defined
For purposes of this paragraph-
(i) In general
The term "passive asset" means any asset other than an asset used in carrying on a trade or business.

Section 6166(j), Comment 2:   Reg. §20.6166A-3(d)(3), example 2, provides (in the context of §303 redemptions):
Example (2).
      The decedent's 40-percent interest in the XYZ partnership constituted an interest in a closely held business. Since the decedent's interest in the closely held business amounted to less than 50 percent of the value of the business, money or other property equaling or exceeding 50 percent of the value of the business could not be withdrawn from the decedent's interest in the business. Therefore, withdrawals of money or other property from this trade or business never would accelerate the payment of the tax under the provisions of this paragraph.
In 1981 §6166(g)(1)(A), regarding acceleration of the tax extended under §6166, was amended to read:
(g) Acceleration of payment
    (1) Disposition of interest; withdrawal of funds from business
(A) If-
(i)(I) any portion of an interest in a closely held business which qualifies under subsection (a)(1) is distributed, sold, exchanged, or otherwise disposed of, or
(II) money and other property attributable to such an interest is withdrawn from such trade or business, and
(ii) the aggregate of such distributions, sales, exchanges, or other dispositions and withdrawals equals or exceeds 50 percent of the value of such interest,
then the extension of time for payment of tax provided in subsection (a) shall cease to apply, and the unpaid portion of the tax payable in installments shall be paid upon notice and demand from the Secretary.
Effective for estates of decedents dying after after Dec-31-1981, a disposition, sale, exchange, or other disposition of 50% or more of the decedent's interest in a closely held business (rather than 50% or more of the entire business value) will result in a termination of the extension under §6166. This would be true even if a decedent owned a 40% interest in the business.

The author has reason to believe that IRS is working on a complete rewrite of the regulations for section 6166, which could be issued in the relatively near future. The proposed regulations will incorporate all of the relevant provisions from the existing regulations cited above, and should include new provisions regarding bifurcation of the tax extended under section 6166. The proposed regulation examples illustrating bifurcation computations will be extremely complex. Further, see our notes on Bifurcated 6166 Elections.


2017 Update: Statements made by the Trump administration place in doubt the likelihood of proposed section 6166 regulations being published.