Complete Years Since Appointment as a Designated Manager

Exhibit 10.39

Amended April 30, 2013

SUPPLEMENTARY PENSION PLAN

FOR DESIGNATED MANAGERS

OF DOMTAR INC.

As in effect on March 7, 2007,

including amendments up to April 30, 2013

Table of Contents

For the period of disability recognized pursuant to Section 11 of the Supplementary Pension Plan, Earnings are deemed based on the Member’s salary rate on the day his disability begins.

Notwithstanding the foreign Member declaration of U.S. Taxpayer status, and unless proven otherwise, if the Company’s payroll, human resources, or other records indicate that the Member is a U.S. Taxpayer, then the Member shall be deemed to be a U.S. Taxpayer for the purposes of the Supplementary Pension Plan.

A Member who Separates from Service on or beyond his Normal Retirement Date shall receive from the Company, in accordance with the Supplementary Pension Plan, a monthly pension of one twelfth of the excess of (a) over (b) below:

For the purposes of this paragraph (b), any amount of pension shall be determined disregarding any credit splitting resulting from a marriage breakdown.

If the Designated Manager commenced his participation to the Supplementary Pension Plan after January 1, 1998, his pension under the Supplementary Pension Plan shall be multiplied by the applicable percentage below:

A Member who Separates from Service, for a reason other than death, before his Normal Retirement Date but on or after age 55, shall receive from the Company, in accordance with the Supplementary Pension Plan, a monthly pension of one twelfth of the excess of (a) over (b) defined below:

If the Member commenced his participation to the Supplementary Pension Plan after January 1, 1998, his pension under the Supplementary Pension Plan shall be multiplied by the applicable percentage below:

A Member, other than a U.S. Taxpayer, who Separates from Service, for a reason other than death, before his Normal Retirement Date but on or after age 55 and who is entitled to a pension from the Supplementary Pension Plan under Article 4 above, may elect to defer the commencement of this pension until the first day of any calendar month preceding or coinciding with his Normal Retirement Date, provided he has chosen the same option for the early retirement pension to which he is entitled in accordance with the Base Plan.

In such event, the amount of pension to which he is entitled in accordance with the Supplementary Pension Plan shall be calculated as provided in Section 4 but using the pension commencement date as the date of calculation of the reduction factors of paragraph (a) of Section 4 and as the date of calculation of the amount of pension under the Base Plan for paragraph (b) of Section 4.

For more certainty, this Section 5 does not apply to a U.S. Taxpayer.

Any increase in pension under the DB Option of the Base Canadian Pension Plan after Separation from Service shall have no impact on the pension payable to the Member from the Supplementary Pension Plan under this paragraph 6.2.

The normal form of pension payable under the Supplementary Pension Plan shall consist of monthly benefits payable in equal amounts starting on the first day of the month coinciding with or following the month of the Member’s date of Separation from Service and on the first day of every subsequent month for the life of the Member, provided, however, that, for a U.S. Taxpayer, any such payment that is subject to Section 409A and that would otherwise be payable within six months following the Member’s Separation from Service shall be delayed and paid on the first day of the month following the six-month anniversary of the Member’s Separation from Service to the extent necessary to comply with Section 409A. If the Member dies before 60 monthly payments have been made, payments under the Supplementary Pension Plan shall continue to his estate until 60 monthly payments have been made.

For the purposes of Articles 3, 4, and 6 of the present document, the pension amount due in accordance with the Base Plan shall be that which corresponds to the normal form of pension and shall exclude the additional pension resulting from excess contributions of the Base Plan, if any.

In this event, the payment of the pension due in accordance with the Supplementary Pension Plan shall be made following the terms and conditions applicable under the Base Plan for the optional form of pension elected (or deemed to have been elected). However, if the Member elects a form of pension under the DB Option of the Base Plan that has an Actuarial Equivalent Value greater than the Actuarial Equivalent Value of the pension under the normal form of payment under the Supplementary Pension Plan, the Supplementary Pension Plan pension shall be reduced by the Actuarial Equivalent Value of such additional value under the Base Plan.

Payment of the pension due in accordance with the Supplementary Pension Plan shall be the Actuarial Equivalent Value of the pension to which the Member would otherwise be entitled under the normal form of payment described in Section 7.

If a Member Separates from Service by reason of death before the commencement of his pension payments, his estate shall receive a single lump sum payment equal to the Actuarial Equivalent Value of the benefits to which he would have been entitled under the Supplementary Pension Plan had he Separated from Service involuntarily for a reason other than death and just cause on the day of his death. Any such payment shall be made within 90 days of the date of the Member’s death.

If a Member dies after Separation of Service and before the payment of any benefit under the Supplementary Pension Plan and the Member is entitled to a deferred pension under Section 5, 6.2 or 6.5, his estate shall receive a single lump sum equal to the Actuarial Equivalent Value of the benefits to which he would otherwise be entitled to receive under Section 5, 6.2 or 6.5 as applicable to the Member. Any such payment shall be made within 90 days of the date of the Member`s death.

Subject to Article 8, if a Member dies after payment of his pension, determined in accordance with Articles 3, 4, 5 or 6, as applicable, has commenced, the death benefits shall be determined in accordance with the normal form of pension as described in Article 7.

A Member who is considered disabled under the Base Plan, and who continues, on that basis, to accrue Credited Service and pension credits under that plan, shall continue to accrue Credited Service for the purposes of the Supplementary Pension Plan.

For the purposes of the Supplementary Pension Plan, a disabled Member is deemed to have Separated from Service on the date he Separated from Service under the Base Plan.

The HR Committee is responsible for the administration of the Supplementary Pension Plan, the supervision of its application and the interpretation of its provisions. With respect to Members who are not U.S. Taxpayers, the HR Committee may, at its discretion, approve other settlement options of benefits payable under this Supplementary Pension Plan.

The Supplementary Pension Plan is not funded. All benefits payable under the Supplementary Pension Plan are paid from the general funds of the Company.

No benefit payable under the provisions of the Supplementary Pension Plan shall be in any manner capable of anticipation, surrender, commutation, alienation, sale, transfer, assignment, pledge, encumbrance or charge; nor shall any such benefit be in any manner subject to the debts, contracts, liabilities, engagements or torts of the person entitled to such benefit, except as specifically provided in any applicable legislation.

In the event of any conflict or inconsistency between the provisions of the Supplementary Pension Plan and the provisions of the Base Plan, the provisions of the Supplementary Pension Plan shall prevail.

The Company reserves the right to amend or terminate the Supplementary Pension Plan at any time. Subject to Section 17.6, no amendment or termination shall adversely affect any benefits that have accrued up to the effective date of such change, based on Earnings, Credited Service and Base Plan accrued benefits up to that date, which effective date shall not precede the date on which the change is communicated to the Member. Notwithstanding the foregoing, any amendment to this Supplementary Pension Plan which is the result of a change to the Base Plan shall take effect as of the same date as applicable in respect of the amendment to the Base Plan.

All amounts under the Supplementary Pension Plan shall be in Canadian currency.

All payments under the Supplementary Pension Plan are expressed on a pre-tax basis and shall be subject to applicable withholding tax and reporting pursuant to applicable legislation.

The Supplementary Pension Plan shall be interpreted, with respect to a Member, in accordance with the laws of the same jurisdiction as applicable for purposes of the Member’s employment agreement with the Company, which is in force at the relevant time, or in the absence of an employment agreement, with the law of the Province of Québec.

The Supplementary Pension Plan supersedes and replaces any and all prior plans, agreements, arrangements or understandings between the Company and the Senior Executive Employee regarding any retirement benefits to be provided to the Senior Executive Employee in excess of those that may be payable in accordance with the provisions of the Base Plans.

Should any of the provisions of the Supplementary Pension Plan and/or conditions be illegal or not enforceable, it or they shall be considered severable and the Supplementary Pension Plan and the remaining conditions shall remain in full force and effect and be binding upon the parties as though the said provision or provisions had never been included.

The Supplementary Pension Plan shall enure to the benefit of and be binding upon the respective successors of the parties hereto, and the heirs, administrators and legal representatives of the Member.

Neither the Company nor any of its directors, officers or employees shall have any liability to a Member in the event Section 409A applies to any benefit paid or provided pursuant to the Supplementary Pension Plan in a manner that results in adverse tax consequences for the Member or any of his or her beneficiaries or transferees. The HR Committee may unilaterally amend, modify or terminate any benefit provided under the Supplementary Pension Plan if it determines, in its sole discretion, that such amendment, modification or termination is necessary or advisable to comply with applicable U.S. law as a result of changes in law or regulation or to avoid the imposition of an additional tax, interest or penalty under Section 409A.