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INCOME TAXES
9 Months Ended
Sep. 30, 2020
Income Tax Disclosure [Abstract]  
Income taxes
5. INCOME TAXES
Our provision for income taxes is calculated using an estimated annual effective tax rate, based upon expected annual income, less losses in certain jurisdictions, permanent items, statutory rates and planned tax strategies in the various jurisdictions in which we operate. However, discrete items related to prior year tax items are treated separately.
Our interim effective tax rate was 19.8 percent and 404.4 percent for the three months ended September 30, 2020 and September 30, 2019, respectively. The change in the effective tax rate is predominately attributable to a pre-tax loss and benefits from the CARES Act (as defined below).
Our interim effective tax rate was 28.7 percent and 43.2 percent for the nine months ended September 30, 2020 and September 30, 2019, respectively. The change in the effective tax rate is predominately attributable to a pre-tax loss, a release in uncertain tax benefits, and benefits from the CARES Act (as defined below).
We have considered the income tax accounting and disclosure implications of the relief provided by the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”) enacted on March 27, 2020. As of September 30, 2020, we have evaluated the income tax provisions of the CARES Act and determined there to be a 4.4 percent benefit to the September 30, 2020 tax rate and a 3.9 percent benefit to the computation of the estimated effective tax rate for the year ended December 31, 2020. We will continue to evaluate the income tax provisions of the CARES Act and monitor the developments in the jurisdictions where we have significant operations for tax law changes that could have additional income tax accounting and disclosure implications.
Unrecognized Tax Benefits
The following table summarizes the activity related to our unrecognized tax benefits (excluding interest and penalties) during the nine months ended September 30, 2020.
($ in millions)Unrecognized Tax Benefits
Balance at December 31, 2019$21 
Increases related to tax positions taken during the current period
Decreases related to settlements with taxing authorities(14)
Decreases related to tax positions taken during a prior period(1)
Balance at September 30, 2020$
The total unrecognized tax benefits related to uncertain income tax positions, which would affect the effective tax rate if recognized, was $7 million at September 30, 2020 and $21 million at December 31, 2019. The total amount of gross interest and penalties accrued was $18 million at September 30, 2020 and $41 million at December 31, 2019.
We anticipate $4 million of unrecognized tax benefits, including interest and penalties, to be indemnified pursuant to a Tax Matters Agreement dated May 11, 2016 by and among Starwood Hotels & Resorts Worldwide, Inc., Vistana Signature Experiences, Inc., and Interval Leisure Group, Inc., and consequently have recorded a corresponding indemnification asset. The unrecognized tax benefits, including accrued interest and penalties, are included in other liabilities on our Balance Sheet.
Our income tax returns are subject to examination by relevant tax authorities. Certain of our returns are being audited in various jurisdictions for tax years 2013 through 2018. The amount of the unrecognized tax benefit may increase or decrease within the next twelve months as a result of audits or audit settlements.