Has the IRS tax calculator changed since 2013?

The IRS tax and withholding calculators have been updated to reflect changes in tax provisions since the 2013 tax year, according to the Internal Revenue Service. These changes include alterations in eligibility requirements and benefit amounts that are indexed to inflation.

Tax changes and inflation adjustments that affect IRS tax calculations differently in tax years after 2013 include an increase in the standard deduction for individuals and married couples and an increase in the personal exemption amount, the IRS states. Changes to top tax bracket income thresholds, estate tax exemptions and foreign income exclusions since 2013 also affect some taxpayers.