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IRS.gov Website
Instructions for Form 2290
taxmap/instr2/i2290-013.htm#en_us_publink100030313

taxmap/instr2/i2290-013.htm#TXMP3b6f9bcc
Signature(p9)

rule
Sign the return. Returns filed without a signature will be sent back to you for signing. An unsigned return is not considered filed.