What is Supplemental Income—and How is it Taxed? - American Express
https://www.americanexpress.com/en-us/credit-cards/credit-intel/supplemental-income/?linknav=creditintel-life-article
WEBFeb 14, 2020 · If you receive the supplemental income as a separate payment, IRS guidelines give employers the option to instead withhold income tax on the payment at a flat rate of 22%, regardless of your normal tax withholding rate.3 In some cases, this may mean that a bigger bite gets taken out of your supplemental income payment than …
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