Example 1. (i) Facts. A controlled group of corporations consists of three members: X, Y and Z. X owns all the stock of Y and Z. Each corporation files its separate return on a calendar year basis. For calendar year 2007, the component members of the controlled group have an apportionment plan in effect. The members apportioned 80% of the 15 percent tax-bracket amount ($40,000) to X and the remaining 10% ($10,000) to Y. The members apportioned 100% of the 25 percent tax-bracket amount ($25,000) to Y. However, these members have not adopted the FIFO method for apportioning the additional taxes. Therefore, they must follow the proportionate method. For 2007, X had taxable income (TI) of $40,000, Y had TI of $60,000 and Z had TI of $100,000. Thus the total TI of the group is $200,000.

(ii) Calculating the tax from the tax brackets and the tax benefit derived from such tax.

(A) Regular tax of group subject to a 15 percent tax rate.

(1) Calculating the group's tax which resulted from applying a 15 percent tax rate. The amount of tax under the 15 percent tax bracket is $7,500 (15% × $50,000).

(2) The tax-benefit amount inuring to the group from using the 15 percent tax bracket. A tax benefit inures to those members of the group who avail themselves of the 15 percent tax bracket. That tax benefit results from having the first $50,000 of its income taxed at the 15 percent tax rate, instead of at the 34 percent tax rate. Thus, the tax-benefit amount inuring to this group from using the 15 percent tax bracket is $9,500 ($17,000 (34% × $50,000) minus $7,500 (15% × $50,000)).

(B) Regular tax of group subject to a 25 percent tax rate.

(1) Calculating the group's tax which resulted from applying a 25 percent tax rate. The amount of tax under the 25 percent tax bracket is $6,250 (25% × $25,000 ($75,000−$50,000)).

(2) The tax-benefit amount inuring to the group from using the 25 percent tax bracket. A tax benefit inures to those members of the group who avail themselves of the 25 percent tax bracket. That tax benefit results from having $25,000 of its income taxed at the 25 percent tax rate, instead of at the 34 percent tax rate. Thus, the tax-benefit amount inuring to this group from using the 25 percent tax bracket is $2,250 ($8,500 (34% × $25,000) minus $6,250 (25% × $25,000)).

(C) Regular tax of group subject to a 34 percent tax rate.

(1) Calculating the group's tax which resulted from applying a 34 percent tax rate. The amount of tax under the 34 percent tax bracket is $42,500 (34% × $125,000 ($200,000 (total TI)−$75,000) (amount taxed at lower rates)).

(2) The tax-benefit amount inuring to the group from using the 34 percent tax bracket. The group's total TI of $200,000 is less than the $15,000,000 income threshold for imposing any 3 percent additional tax on the group. Therefore, there is no tax benefit inuring to the members of this group for using the 34 percent tax bracket.

(D) The computation of the additional tax. Since the combined TI of the group exceeds $100,000, a 5 percent additional tax is imposed on the group. That 5 percent additional tax is the lesser amount of 5 percent of the group's taxable income exceeding $100,000 or $11,750. Five percent of that excess amount of taxable income is $5,000 (5% × $100,000 ($200,000−$100,000)). Since $5,000 is less than $11,750, the group's 5 percent additional tax is $5,000.

(iii) Apportioning the amount of additional tax to each applicable tax bracket.

(A) The apportioned tax under each bracket. The amount of tax owed by each member under each tax bracket pursuant to the apportionment plan is as follows:

(B) Apportioning the 5 percent additional tax among the component members of the controlled group. Since the group did not elect to adopt the FIFO method of apportionment, it is required to apportion the $5,000 of its 5 percent additional tax pursuant to the proportionate method in the following manner:

(1) Amount of the additional tax apportioned to X. Pursuant to the plan, X was liable for $6,000 of the group's $7,500 regular tax (80%) owed under the 15 percent tax bracket (and X is not liable for any regular tax under any higher tax bracket). See Step 1 of paragraph (a)(2)(ii)(A) of this section. X's portion of the group's tax benefit which it derived from using the 15 percent tax rate is $7,600 (0.8 × $9,500). See Step 2. The tax benefit inuring to the entire group from using the 15 percent and 25 percent tax brackets is $11,750 ($9,500 (from the 15 percent tax bracket) + $2,250 (from the 25 percent tax bracket)). So, X's percentage portion of the group's total tax benefit is $7,600/$11,750 (64.68%). See Step 3. Thus, X's allocated portion of the 5 percent additional tax from using the 15 percent tax bracket is $3,234 (0.6468 × $5,000). See Step 4.

(2) Amount of the additional tax apportioned to Y. (i) Regular tax apportioned to Y from using the 15 percent tax bracket. Pursuant to the plan, Y was liable for the remaining $1,500 of the group's $7,500 regular tax (20%) owed under the 15 percent tax bracket. See Step 1. Y's portion of the group's tax benefit which it derived from using the 15 percent tax rate is $1,900 ($9,500−$7,600, or 0.2 × $9,500). See Step 2. So, Y's percentage portion of the group's total tax benefit is $1,900/$11,750 (16.17%). See Step 3. Thus, Y's allocated portion of the 5 percent additional tax from using the 15 percent tax bracket is $809 (0.1617 × $5,000). See Step 4.

(ii) Regular tax apportioned to Y from using the 25 percent tax bracket. Pursuant to the plan, Y was liable for 100% of the group's regular tax owed under the 25 percent tax bracket, an amount of $6,250. See Step 1. Y is, therefore, entitled to 100% of the group's tax benefit which it derived from using this tax bracket, an amount of $2,250. See Step 2. So, Y's percentage portion of the group's total tax benefit is $2,250/$11,750 (19.15%). See Step 3. Thus, Y's allocated portion of the 5 percent additional tax from using the 25 percent tax bracket is $957 (0.1915 × $5,000). See Step 4. Y's total allocated portion of the additional tax is $1,766 ($809 + $957). See Step 5.

Example 2. (i) Facts. The facts are the same as in Example 1, except that on August 31, 2007, X of the X-Y-Z controlled group sold all of the stock of Z to M of the M-N controlled group, a pair of corporations unrelated to the X-Y group. Pursuant to the terms of the sales agreement, the members of the M-N group properly notified the members of the X-Y group on a timely basis that Z's taxable income for its 2007 tax year, as based on the group's December 31st testing date, was $100,000.

(ii) Controlled group analysis. On December 31st, 2007, X and Y are members of the selling controlled group and M, N and Z are members of the buying controlled group. However, pursuant to section 1563(b)(3), Z is treated as an additional member of the X-Y group on December31st 2007, since it was a member for at least one-half the number of days (243 out of 364) during the period beginning on January 1 and ending on December 30, 2007. Conversely, pursuant to section 1563(b)(2)(A), Z is treated as an excluded member of the M-N controlled group. Therefore, on December 31st, 2007, X, Y, and Z qualify as component members of the selling group, and only M and N qualify as component members of the buying group.

(iii) Additional tax analysis. With regard to X and Y's 2007 tax years, X and Y together owed $5,000 of additional tax, as calculated in Example 1. X's allocated portion of the additional tax is $3,234, as calculated in the manner set forth in Example 1. Y's allocated portion of the additional tax is $1,766, also as calculated in the manner set forth in Example 1.

Example 3. (i) Facts. The facts are the same as in Example 2, except that in 2012, pursuant to an IRS audit, Z's 2007 taxable income was re-determined. It was adjusted by an income increase of $10,000. Pursuant to the terms of the sales agreement, the members of the M-N group timely notified the members of the X-Y group of Z's income adjustment.

(ii) Additional tax analysis. For 2007 the X-Y-Z group owed a revised additional tax in the amount of $5,500, allocated as follows: $3,557.40 to X and $1,942.60 to Y. X and Y each filed an amended 2007 tax return to report their portions of the $500 increase to the group's additional tax. Pursuant to their apportionment plan for allocating their regular tax, and as a result of defaulting to the proportionate method for allocating the group's additional tax, X reported $323.40 as its share of the group's increase to its additional tax and Y reported $176.60 as its share of the group's increase to its additional tax.

Example 4. The facts are the same as in Example 1, except that the members elected in their apportionment plan to adopt the FIFO method for apportioning the additional tax. Under the FIFO method, the 5 percent additional tax amount of $5,000 will be apportioned entirely to those members who would benefit from using the 15 percent tax bracket, by reason that $5,000 of the group's additional tax is less than $9,500, which is the full tax-benefit amount inuring to a controlled group from having a 15 percent tax rate applied to the full income bracket subject to that rate. Since X derived 80 percent of the group's tax benefit by its use of the 15 percent tax bracket, its share of the group's 5 percent additional tax is $4,000 (80% × $5,000), and Y's share of the group's 5 percent additional tax is, therefore, $1,000, which is the remaining amount of the group's 5 percent additional tax, attributable to the 15 percent tax bracket.

Example. (i) Facts. A controlled group of corporations consists of three members: X, Y and Z. X owns all of the stock of Y and Z. Each corporation files its separate return on a calendar year basis. For calendar year 2007, the component members of this controlled group have an apportionment plan in effect. The group has chosen to apportion the entire section 55(d)(2) exemption amount of $40,000 to Z. For 2007, X had alternative minimum taxable income (AMTI) of $40,000, Y had AMTI of $60,000 and Z had AMTI of $100,000. Thus the total AMTI of the group is $200,000.

(ii) Calculating the reduction to the exemption amount. Section 55(d)(3)(A) provides that the section 55(d)(2) exemption amount shall be reduced (but not below zero) by an amount equal to 25 percent of the amount by which the AMTI of a corporation exceeds $150,000. For the purpose of computing the group's AMTI, the AMTI of each of the component members, for their tax years that have the same December 31st testing date, shall be taken into account. In accordance with these provisions, the $40,000 exemption amount is reduced by $12,500 (25% × $50,000 ($200,000−$150,000)). Pursuant to the group's allocation plan, the entire $12,500 reduction to the exemption amount is allocated to Z. Thus, after such allocation, Z's $40,000 exemption amount is reduced to $27,500 ($40,000−$12,500).

Example 1. Formation of a new member of a controlled group— (i) Facts. On January 2, 2007, corporation X transfers cash to newly formed corporation Y (which begins business on that date) and receives all of the stock of Y in return. X also owns all of the stock of corporation Z on each day of 2006 and 2007. X, Y and Z have an apportionment plan in effect, apportioning the 15 percent taxbracket amount as follows: 40% ($20,000) to each of X and Y and 20% ($10,000) to Z. X, Y and Z each file a separate return with respect to the group's December 31st, 2007 testing date. X is on a calendar tax year and Z is on a fiscal tax year ending on March 31. Y adopts a fiscal year ending on June 30 and timely files a tax return for its short taxable year beginning on January 2, 2007, and ending on June 30, 2007.

(ii) Y's short taxable year. On June 30, 2007, Y is a component member of a parentsubsidiary controlled group of corporations composed of X, Y and Z. Pursuant to paragraph (e)(1) of this section, the group may not apportion any amount of the 15 percent tax bracket to Y's short taxable year ending on June 30, 2007. Rather, Y is entitled to exactly 1⁄3 of such bracket amount, or $16,667.

(iii) The members' subsequent tax years. On December 31st, 2007, X, Y and Z are component members of a parent-subsidiary controlled group of corporations. For their tax years that include December 31st, 2007 (X's calendar year ending December 31st, 2007, Z's fiscal year ending March 31, 2008 and Y's fiscal year ending June 30, 2008), X, Y and Z apportion among themselves the full amount of all of the applicable tax brackets pursuant to their apportionment plan. For example, 40% of the 15 percent tax-bracket amount, or $20,000, was apportioned to each of X and Y, and the remaining 10%, or $10,000, was apportioned to Z.

Example 2. Allocating a tax bracket to the short taxable year of a liquidated member of a controlled group— (i) Facts. On January 1, 2007, corporation P owns all of the stock of corporations S1, S2 and S3 (the P group). Each of these four component members of the P group, with respect to the group's December 31st, 2007 testing date, files its separate return on a calendar year basis. These members have an apportionment plan in effect (the P group plan) under which S1 and S2 are each entitled to 40% of the 15 percent tax-bracket amount ($20,000), and P and S3 are each entitled to 10% of the 15 percent tax-bracket amount ($5,000). On May 31, 2007, S1 liquidates and therefore files a return for the short taxable year beginning on January 1, 2007, and ending on May 31, 2007. On July 31, 2007, S2 liquidates and therefore files a return for the short taxable year beginning on January 1, 2007 and ending on July 31, 2007. P and S3 each file a return for their 2007 calendar tax years.

(ii) Apportionment of the 15 percent tax bracket to S1 for its short taxable year. On May 31, 2007, S1 is a component member of the P group composed of P, S1, S2 and S3. Pursuant to paragraph (e)(1) of this section, the group may not apportion any amount of the 15 percent tax bracket to S1's short taxable year ending on June 30, 2007. Rather, S1 is entitled to exactly 1⁄4 of such bracket amount, or $12,500.

(iii) Apportionment of the 15 percent tax bracket to S2 for its short taxable year. On July 31, 2007, S2 is a component member of the P group composed of P, S2 and S3. Pursuant to paragraph (e)(1) of this section, the group may not apportion any amount of the 15 percent tax bracket to S2's short taxable year ending on June 30, 2007. Rather, S2 is entitled to exactly 1⁄4 of such bracket amount, or $16,667.

(iv) Apportionment of the 15 percent tax bracket to P and S3 for each of their calendar tax years. On December 31st, 2007, P and S3 are component members of the P group. Accordingly, for P and S3's 2007 calendar tax year, they are each apportioned $25,000 of the 15 percent tax bracket, pursuant to the applicable P group plan.

Example 3. Liquidation of member after its transfer to another controlled group— (i) Facts. The facts are the same as in Example 2, except that P, on April 30, 2007, sold all of the stock of S2 to the M-N controlled group. At the time of the sale, M and N are both unrelated to any members of the P group. As in Example 2, S2 liquidates on July 31, 2007, and therefore files a tax return for its short taxable year beginning on January 1, 2007, and ending on July 31, 2007. Pursuant to the sales agreement, the N-M group timely notified P that S2 had liquidated.

(ii) Controlled group analysis. On April 30, 2007, the date of the sale of S2, the P group reasonably expected that S2 would be treated as an excluded member with respect to its December 31st, 2007 testing date. On that April 30th date, S2 had been a member of the P group for less than one-half the number of days of what it expected would be a full 2007 calendar tax year preceding December 31st, 2007 (120 days (January 1-April 30) out of 364 days (January 1-December 30)). Yet, as a result of S2's subsequent liquidation by the M-N group prior to December 31st, 2007, S2 became a component member of the P group with respect to the P group's December 31st, 2007 testing date. With respect to that December 31st testing date, S2 thus was a member of the P group for more than one-half of the number of days of its tax year ending on July 31, 2007, which days proceeded December 31st, 2007 (120 days (January 1-April 30 of 2007) out of 211 days (January 1-July 30 of 2007)). The allocation of the 15 percent tax-bracket amount to the P group members is determined in the same manner as in Example 2 and, therefore, the bracket amounts allocated to P, S1, S2 and S3 are the same as determined in Example 2. The allocation of the bracket amounts would be the same if, at the time P sold all of the S2 stock, the parties had made a section 338(h)(10) election.

Example 4. Short tax year including a December 31st date. Corporation X owns all of the stock of corporations Y and Z. X, Y and Z each file separate returns. X and Y are on a calendar tax year and Z is on a fiscal tax year beginning October 1 and ending September 30. On January 2, 2007, Z liquidates. Because Z's final tax year (beginning on October 1, 2006 and ending on January 2, 2007) includes a December 31st date, that is, December 31, 2006, it is therefore not subject to the short taxable year rule provided by section 1561(b) and paragraph (e) of this section. Accordingly, Z is a component member of the X-Y-Z group, for the group's December 31st, 2006 testing date. Thus, the rules of this paragraph (e) do not limit the amount of any of the tax-benefit items of section 1561(a) available to Z or to this controlled group.

(f) Effective/applicability date. This section applies to any tax year beginning on or after December 21, 2009. However, taxpayers may apply this section to any Federal income tax return filed on or after December 21, 2009. For tax years beginning before December 21, 2009, see §1.1561-2T as contained in 26 CFR part 1 in effect on April 1, 2009.