We are subject to taxes in the United States and in various foreign jurisdictions. Significant judgment is required in determining our worldwide income tax provision, tax assets, and accruals for other taxes, and the ultimate tax determination is uncertain for many transactions. Our effective income tax rate is based in part on our corporate operating structure and how we operate our business and develop, value, and use our intellectual property. Taxing authorities in jurisdictions in which we operate have challenged and audited, and may continue to, challenge and audit our methodologies for calculating our income taxes, which could increase our effective income tax rate. In addition, our provision for income taxes is materially affected by our profit levels, changes in our business, changes in our geographic mix of earnings, changes in the elections we make, changes in our corporate structure, or changes in applicable accounting rules, as well as other factors.
Changes to enacted U.S. federal, state or international tax laws, as well as changes to interpretations of existing tax laws, particularly in Switzerland, where our international business is headquartered, and actions we have taken in our business with respect to such laws, have affected, and could continue to affect, our effective tax rates and cash taxes, and could cause us to change the way in which we structure our business and result in other costs. For example, the European Union and other countries, including Switzerland, have enacted or have committed to enact global minimum taxes which could impact our provision for income taxes and cash taxes. Our effective tax rate also could be adversely affected by changes in the measurement of our deferred income taxes, including the need for valuation allowances against deferred tax assets. Our valuation allowances, in turn, are impacted by several factors with respect to our business, industry, and the macroeconomic environments, including changing interest rates and tax laws. Significant judgment is involved in determining the amount of valuation allowances, and actual financial results also may differ materially from our current estimates and could have a material impact on our assessments.
We are required to pay taxes other than income taxes, such as payroll, sales, use, value-added, net worth, property, transfer, and goods and services taxes, in both the United States and foreign jurisdictions. Several foreign jurisdictions have introduced new digital services taxes on revenue of companies that provide certain digital services or expanded their interpretation of existing tax laws with regard to other non-income taxes. There is limited guidance about the applicability of these new taxes or changing interpretations to our business and significant uncertainty as to what will be deemed in scope. If these foreign taxes are applied to us, it could have an adverse and material impact on our business and financial performance.