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ContentsWhat's New..................1Reminders...................1Introduction..................2Who Must File.................2Who Should File...............5Filing Status..................5Dependents.................11Social Security Numbers for Dependents..............22Standard Deduction............232021 Standard Deduction Tables....24How To Get Tax Help...........26Index.....................29What's NewWho must file. In some cases, the amount of income you can receive before you must file a tax return has increased. Table 1 shows the fil-ing requirements for most taxpayers.Standard deduction increased. The stand-ard deduction for taxpayers who don't itemize their deductions on Schedule A of Form 1040 or 1040-SR is higher for 2021 than it was for 2020. The amount depends on your filing status. You can use the 2021 Standard Deduction Tables near the end of this publication to figure your standard deduction.Charitable contribution deduction. In 2021, you are allowed a charitable con...