E-Filing - Last Name Suffix (i.e. Jr, Sr, Third, III)
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If you have a suffix as part of your name (i.e. Jr, Sr, III, etc.), you can enter it after your last name in that field of the return. As the IRS only looks at the first 4 characters of the last name in an electronically filed return, it will not matter if this is left off due to space constraints.