BASIS OF CONSOLIDATION AND COMBINATION AND SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
Dec. 31, 2024
Accounting Policies [Abstract]
Consolidation	BASIS OF CONSOLIDATION The consolidated financial statements include the accounts of Sylvamo Corporation and subsidiaries for which we have a controlling financial interest. All intracompany transactions have been eliminated.
Use of Estimates	USE OF ESTIMATES In preparing the consolidated financial statements in accordance with U.S. GAAP, management makes estimates and assumptions that affect amounts reported in the consolidated financial statements and accompanying notes. Actual results may differ from those estimates.
Revenue Recognition, Shipping and Handling Costs	REVENUE RECOGNITION The Company recognizes revenue on a point-in-time basis when the customer takes title to the goods and assumes the risks and rewards for the goods. For customized goods where the Company has a legally enforceable right to payment for the goods, the Company recognizes revenue over time, which generally is as the goods are produced. The Company’s revenue is primarily derived from fixed consideration; however, we do have contract terms that give rise to variable consideration, primarily volume rebates, early payment discounts and other customer refunds. The Company estimates its volume rebates at the individual customer level based upon the terms of the arrangement and expected volume purchases over the contract period, consistent with the most likely amount method outlined in ASC 606. The Company estimates early payment discounts and other customer refunds based on the historical experience across the Company’s portfolio of customers to record reductions in revenue which is consistent with the expected value method outlined in ASC 606. Management has concluded that these methods result in the best estimate of the consideration the Company will be entitled to from its customers. The Company has elected to present all sales taxes on a net basis, account for shipping and handling activities as fulfillment activities, and not record interest income or interest expense when the difference in timing of control or transfer and customer payment is one year or less.
Business Combinations Policy	BUSINESS COMBINATIONS The Company allocates the total consideration of the assets acquired and liabilities assumed based on their estimated fair value as of the business combination date. In developing estimates of fair values for long-lived assets, including identifiable intangible assets, the Company utilizes a variety of inputs including forecasted cash flows, anticipated growth rates, discount rates, customer attrition, royalty rates, estimated replacement costs and depreciation and obsolescence factors. Determining the fair value for tangible assets such as real and personal property and specifically identified intangible assets such as customer lists and developed technology involves judgment. We may refine our estimates and make adjustments to the assets acquired and liabilities assumed over a measurement period, not to exceed one year. Upon the conclusion of the measurement period or the final determination of the values of assets acquired and liabilities assumed, whichever comes first, any subsequent adjustments are charged to the consolidated statements of operations.
Temporary Investments	TEMPORARY INVESTMENTS Temporary investments with an original maturity of three months or less and money market funds with greater than three-month maturities but with the right to redeem without notice are treated as cash equivalents and are stated at cost, which approximates market value.
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy	RESTRICTED CASH Cash that is legally restricted from use is classified as restricted cash.
Cost of Goods and Service	COST OF PRODUCTS SOLD Costs of products sold represents costs directly related to the manufacture of our products. Primary costs include raw materials, packaging, direct labor, overhead, warehousing costs and shipping and handling costs, such as freight to customers’ destinations.
Inventories	INVENTORIES Inventories are valued at the lower of cost or market value and include costs directly associated with manufacturing products: materials, labor, first leg freight and manufacturing overhead. In the United States, costs of raw materials and finished paper and pulp products are generally determined using the last-in, first-out method. Other inventories are valued using the first-in, first-out or average cost methods.
Leased Assets	LEASED ASSETS Operating lease right of use (“ROU”) assets and liabilities are recognized at the commencement date of the lease based on the present value of lease payments over the lease term. The Company’s leases may include options to extend the lease. These options to extend are included in the lease term when it is reasonably certain that we will exercise that option. Some leases have variable payments, however, because they are not based on an index or rate, they are not included in the ROU assets and liabilities. Variable payments for real estate leases are primarily related to common area maintenance, insurance, taxes and utilities. Variable payments for equipment, vehicles and leases within supply agreements are primarily related to usage, repairs and maintenance. As the implicit rate is not readily determinable for most of the Company’s leases, the Company applies a portfolio approach using an estimated incremental borrowing rate to determine the initial present value of lease payments over the lease terms on a collateralized basis over a similar term, which is based on market and company specific information. We use the unsecured borrowing rate and risk adjust that rate to approximate a collateralized rate, and apply the rate based on the currency of the lease, which is updated on a quarterly basis for measurement of new lease liabilities. Leases having a lease term of twelve months or less are not recorded on the balance sheet and the related lease expense is recognized on a straight-line basis over the term of the lease. In addition, the Company has applied the practical expedient to account for the lease and non-lease components as a single lease component for all of the Company’s leases.
Plants, Properties and Equipment	PLANTS, PROPERTIES AND EQUIPMENT Plants, properties and equipment are stated at cost, less accumulated depreciation. Expenditures for betterments are capitalized, whereas normal repairs and maintenance are expensed as incurred. The units-of-production method of depreciation is used for the mills, and the straight-line method is used for other plants and equipment.
Goodwill	GOODWILL Annual evaluation for possible goodwill impairment is performed as of the beginning of the fourth quarter of each year, with additional interim evaluation performed when management believes that it is more likely than not that events or circumstances have occurred that would result in the impairment of a reporting unit’s goodwill. The Company has the option to evaluate goodwill for impairment by first performing a qualitative assessment of events and circumstances to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, the Company determines that it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then the quantitative goodwill impairment test is not required to be performed. If the Company determines that it is more likely than not that the fair value of a reporting unit is less than its carrying amount, or if the Company does not elect the option to perform an initial qualitative assessment, then the Company is required to perform the quantitative goodwill impairment test. In performing this evaluation, the Company estimates the fair value of its reporting unit using a weighted approach based on discounted future cash flows, market multiples and transaction multiples. The determination of fair value using the discounted cash flow approach requires management to make significant estimates and assumptions related to forecasts of future revenues, operating profit margins and discount rates. The determination of fair value using market multiples and transaction multiples requires management to make significant assumptions related to revenue multiples and adjusted earnings before interest, taxes, depreciation and amortization (“EBITDA”) multiples. For reporting units whose carrying amount is in excess of their estimated fair value, the reporting unit will record an impairment charge by the amount that the carrying amount exceeds the reporting unit’s fair value, not to exceed the total amount of goodwill allocated to the reporting unit.
Impairment of Long-Lived Assets	IMPAIRMENT OF LONG-LIVED ASSETS Long-lived assets are reviewed for impairment upon the occurrence of events or changes in circumstances that indicate that the carrying value of the assets may not be recoverable. A recoverability test is performed based on undiscounted cash flows, requiring judgments as to the weighting of operational alternatives being considered by management and estimates of the amount and timing of expected future cash flows from the use of the long-lived assets generated by their use. Impaired assets are written-down to their estimated fair value.
Employee Retirement Benefits	EMPLOYEE RETIREMENT BENEFITS The Company sponsors certain defined benefit pension and postretirement plans in Belgium, Brazil, France, Poland, the United Kingdom and the United States. The Company accounts for these plans using the single-employer method, with the net funded status of these plans recorded as an asset or liability in the consolidated balance sheets.
Income Taxes	INCOME TAXES We account for income taxes under the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements. Deferred tax assets are recognized to the extent that we believe that these assets are more likely than not to be realized. We record uncertain tax positions in accordance with ASC 740 on the basis of a two-step process in which (1) we determine whether it is more likely than not that the tax positions will be sustained on the basis of the technical merits of the position and (2) for those tax positions that meet the more-likely-than-not recognition threshold, we recognize the largest amount of tax benefit that is more than 50 percent likely to be realized upon ultimate settlement with the related tax authority. While we believe that these judgments and estimates are appropriate and reasonable under the circumstances, actual resolution of these matters may differ from recorded estimates and amounts.
Translation of Financial Statements	TRANSLATION OF FINANCIAL STATEMENTS Balance sheets of international operations are translated into U.S. dollars at period-end exchange rates, while statements of operations are translated at average rates. Adjustments resulting from financial statement translations are included as cumulative translation adjustments in accumulated other comprehensive income (loss) (“AOCI”).
Recently Issued Accounting Pronouncements	RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS Disaggregation of Income Statement Expenses In November 2024, the FASB issued ASU 2024-03, “Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses.” This guidance requires disaggregated disclosure of certain income statement captions for public business entities into specified categories within the footnotes to the financial statements. Additional disclosures are required in tabular format for each relevant expense caption on the face of the income statement that includes any of the following natural expenses: (1) purchases of inventory, (2) employee compensation, (3) depreciation, (4) intangible asset amortization, and (5) depreciation, depletion and amortization recognized as part of oil-and gas-producing activities or other types of depletion expenses. This update does not change or remove existing expense disclosure requirements; however, it may affect where that information appears in the footnotes to the financial statements. This guidance is effective for fiscal years beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027. The Company is currently evaluating the provisions of this guidance. Income Taxes In December 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures.” This guidance requires a public entity to disclose in their rate reconciliation table additional categories of information about federal, state and foreign income taxes and to provide more details about the reconciling items in some categories if the items meet a quantitative threshold. The guidance also requires all entities to disclose annually income taxes paid (net of refunds received) disaggregated by federal (national), state and foreign taxes and to disaggregate the information by jurisdiction based on a quantitative threshold. This guidance is effective for annual periods beginning after December 15, 2024. Early adoption is permitted and this guidance should be applied prospectively but there is the option to apply it retrospectively. The Company plans to adopt the provisions of this guidance in conjunction with our Form 10-K for the annual period ending December 31, 2025. Segment Reporting In November 2023, the FASB issued ASU 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures.” This guidance requires a public entity to disclose for each reportable segment, on an interim and annual basis, the significant expense categories and amounts that are regularly provided to the chief operating decision-maker (“CODM”) and included in each reported measure of a segment’s profit or loss. Additionally, it requires a public entity to disclose the title and position of the individual or the name of the group or committee identified as the CODM. The Company adopted the provisions of this guidance for the year ending December 31, 2024. See Note 17 Financial In formation by Business Segment and Geog raphic Area for further details.

BASIS OF CONSOLIDATION AND COMBINATION AND SIGNIFICANT ACCOUNTING POLICIES (Policies)

12 Months Ended

Dec. 31, 2024

BASIS OF CONSOLIDATION

The consolidated financial statements include the accounts of Sylvamo Corporation and subsidiaries for which we have a controlling financial interest. All intracompany transactions have been eliminated.

Use of Estimates

USE OF ESTIMATES

In preparing the consolidated financial statements in accordance with U.S. GAAP, management makes estimates and assumptions that affect amounts reported in the consolidated financial statements and accompanying notes. Actual results may differ from those estimates.

Revenue Recognition, Shipping and Handling Costs

REVENUE RECOGNITION

The Company recognizes revenue on a point-in-time basis when the customer takes title to the goods and assumes the risks and rewards for the goods. For customized goods where the Company has a legally enforceable right to payment for the goods, the Company recognizes revenue over time, which generally is as the goods are produced.

The Company’s revenue is primarily derived from fixed consideration; however, we do have contract terms that give rise to variable consideration, primarily volume rebates, early payment discounts and other customer refunds. The Company estimates its volume rebates at the individual customer level based upon the terms of the arrangement and expected volume purchases

over the contract period, consistent with the most likely amount method outlined in ASC 606. The Company estimates early payment discounts and other customer refunds based on the historical experience across the Company’s portfolio of customers to record reductions in revenue which is consistent with the expected value method outlined in ASC 606. Management has concluded that these methods result in the best estimate of the consideration the Company will be entitled to from its customers.

The Company has elected to present all sales taxes on a net basis, account for shipping and handling activities as fulfillment activities, and not record interest income or interest expense when the difference in timing of control or transfer and customer payment is one year or less.

Business Combinations Policy

BUSINESS COMBINATIONS

The Company allocates the total consideration of the assets acquired and liabilities assumed based on their estimated fair value as of the business combination date. In developing estimates of fair values for long-lived assets, including identifiable intangible assets, the Company utilizes a variety of inputs including forecasted cash flows, anticipated growth rates, discount rates, customer attrition, royalty rates, estimated replacement costs and depreciation and obsolescence factors. Determining the fair value for tangible assets such as real and personal property and specifically identified intangible assets such as customer lists and developed technology involves judgment. We may refine our estimates and make adjustments to the assets acquired and liabilities assumed over a measurement period, not to exceed one year. Upon the conclusion of the measurement period or the final determination of the values of assets acquired and liabilities assumed, whichever comes first, any subsequent adjustments are charged to the consolidated statements of operations.

Temporary Investments

TEMPORARY INVESTMENTS

Temporary investments with an original maturity of three months or less and money market funds with greater than three-month maturities but with the right to redeem without notice are treated as cash equivalents and are stated at cost, which approximates market value.

Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy

RESTRICTED CASH

Cash that is legally restricted from use is classified as restricted cash.

Cost of Goods and Service

COST OF PRODUCTS SOLD

Costs of products sold represents costs directly related to the manufacture of our products. Primary costs include raw materials, packaging, direct labor, overhead, warehousing costs and shipping and handling costs, such as freight to customers’ destinations.

Inventories

INVENTORIES

Inventories are valued at the lower of cost or market value and include costs directly associated with manufacturing products: materials, labor, first leg freight and manufacturing overhead. In the United States, costs of raw materials and finished paper and pulp products are generally determined using the last-in, first-out method. Other inventories are valued using the first-in, first-out or average cost methods.

Leased Assets

LEASED ASSETS

Operating lease right of use (“ROU”) assets and liabilities are recognized at the commencement date of the lease based on the present value of lease payments over the lease term. The Company’s leases may include options to extend the lease. These options to extend are included in the lease term when it is reasonably certain that we will exercise that option. Some leases have variable payments, however, because they are not based on an index or rate, they are not included in the ROU assets and liabilities. Variable payments for real estate leases are primarily related to common area maintenance, insurance, taxes and utilities. Variable payments for equipment, vehicles and leases within supply agreements are primarily related to usage, repairs and maintenance. As the implicit rate is not readily determinable for most of the Company’s leases, the Company applies a portfolio approach using an estimated incremental borrowing rate to determine the initial present value of lease payments over the lease terms on a collateralized basis over a similar term, which is based on market and company specific information. We use the unsecured borrowing rate and risk adjust that rate to approximate a collateralized rate, and apply the rate based on the currency of the lease, which is updated on a quarterly basis for measurement of new lease liabilities. Leases having a lease term

of twelve months or less are not recorded on the balance sheet and the related lease expense is recognized on a straight-line basis over the term of the lease. In addition, the Company has applied the practical expedient to account for the lease and non-lease components as a single lease component for all of the Company’s leases.

Plants, Properties and Equipment

PLANTS, PROPERTIES AND EQUIPMENT

Plants, properties and equipment are stated at cost, less accumulated depreciation. Expenditures for betterments are capitalized, whereas normal repairs and maintenance are expensed as incurred. The units-of-production method of depreciation is used for the mills, and the straight-line method is used for other plants and equipment.

Goodwill

GOODWILL

Annual evaluation for possible goodwill impairment is performed as of the beginning of the fourth quarter of each year, with additional interim evaluation performed when management believes that it is more likely than not that events or circumstances have occurred that would result in the impairment of a reporting unit’s goodwill.

The Company has the option to evaluate goodwill for impairment by first performing a qualitative assessment of events and circumstances to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, the Company determines that it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then the quantitative goodwill impairment test is not required to be performed. If the Company determines that it is more likely than not that the fair value of a reporting unit is less than its carrying amount, or if the Company does not elect the option to perform an initial qualitative assessment, then the Company is required to perform the quantitative goodwill impairment test. In performing this evaluation, the Company estimates the fair value of its reporting unit using a weighted approach based on discounted future cash flows, market multiples and transaction multiples. The determination of fair value using the discounted cash flow approach requires management to make significant estimates and assumptions related to forecasts of future revenues, operating profit margins and discount rates. The determination of fair value using market multiples and transaction multiples requires management to make significant assumptions related to revenue multiples and adjusted earnings before interest, taxes, depreciation and amortization (“EBITDA”) multiples. For reporting units whose carrying amount is in excess of their estimated fair value, the reporting unit will record an impairment charge by the amount that the carrying amount exceeds the reporting unit’s fair value, not to exceed the total amount of goodwill allocated to the reporting unit.

Impairment of Long-Lived Assets

IMPAIRMENT OF LONG-LIVED ASSETS

Long-lived assets are reviewed for impairment upon the occurrence of events or changes in circumstances that indicate that the carrying value of the assets may not be recoverable. A recoverability test is performed based on undiscounted cash flows, requiring judgments as to the weighting of operational alternatives being considered by management and estimates of the amount and timing of expected future cash flows from the use of the long-lived assets generated by their use. Impaired assets are written-down to their estimated fair value.

Employee Retirement Benefits

EMPLOYEE RETIREMENT BENEFITS

The Company sponsors certain defined benefit pension and postretirement plans in Belgium, Brazil, France, Poland, the United Kingdom and the United States. The Company accounts for these plans using the single-employer method, with the net funded status of these plans recorded as an asset or liability in the consolidated balance sheets.

Income Taxes

INCOME TAXES

We account for income taxes under the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements. Deferred tax assets are recognized to the extent that we believe that these assets are more likely than not to be realized.

We record uncertain tax positions in accordance with ASC 740 on the basis of a two-step process in which (1) we determine whether it is more likely than not that the tax positions will be sustained on the basis of the technical merits of the position and (2) for those tax positions that meet the more-likely-than-not recognition threshold, we recognize the largest amount of tax benefit that is more than 50 percent likely to be realized upon ultimate settlement with the related tax authority.

While we believe that these judgments and estimates are appropriate and reasonable under the circumstances, actual resolution of these matters may differ from recorded estimates and amounts.

Translation of Financial Statements

TRANSLATION OF FINANCIAL STATEMENTS

Balance sheets of international operations are translated into U.S. dollars at period-end exchange rates, while statements of operations are translated at average rates. Adjustments resulting from financial statement translations are included as cumulative translation adjustments in accumulated other comprehensive income (loss) (“AOCI”).

Recently Issued Accounting Pronouncements

RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS

Disaggregation of Income Statement Expenses

In November 2024, the FASB issued ASU 2024-03, “Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses.” This guidance requires disaggregated disclosure of certain income statement captions for public business entities into specified categories within the footnotes to the financial statements. Additional disclosures are required in tabular format for each relevant expense caption on the face of the income statement that includes any of the following natural expenses: (1) purchases of inventory, (2) employee compensation, (3) depreciation, (4) intangible asset amortization, and (5) depreciation, depletion and amortization recognized as part of oil-and gas-producing activities or other types of depletion expenses. This update does not change or remove existing expense disclosure requirements; however, it may affect where that information appears in the footnotes to the financial statements. This guidance is effective for fiscal years beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027. The Company is currently evaluating the provisions of this guidance.

Income Taxes

In December 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures.” This guidance requires a public entity to disclose in their rate reconciliation table additional categories of information about federal, state and foreign income taxes and to provide more details about the reconciling items in some categories if the items meet a quantitative threshold. The guidance also requires all entities to disclose annually income taxes paid (net of refunds received) disaggregated by federal (national), state and foreign taxes and to disaggregate the information by jurisdiction based on a quantitative threshold. This guidance is effective for annual periods beginning after December 15, 2024. Early adoption is permitted and this guidance should be applied prospectively but there is the option to apply it retrospectively. The Company plans to adopt the provisions of this guidance in conjunction with our Form 10-K for the annual period ending December 31, 2025.

Segment Reporting

In November 2023, the FASB issued ASU 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures.” This guidance requires a public entity to disclose for each reportable segment, on an interim and annual basis, the significant expense categories and amounts that are regularly provided to the chief operating decision-maker (“CODM”) and included in each reported measure of a segment’s profit or loss. Additionally, it requires a public entity to disclose the title and position of the individual or the name of the group or committee identified as the CODM. The Company adopted the provisions of this guidance for the year ending December 31, 2024. See Note 17 Financial In formation by Business Segment and Geog raphic Area for further details.