Why does Form 603 display certain fields in gray after I enter my Taxpayer Identification Number (TIN)?
Related Questions
- I filed Form 606 manually to register my Taxpayer Identification Number (TIN), but I have not yet received a password to use when filing electronically via ULS. How can I obtain a password?
- Why does Form 603 display certain fields in gray after I enter my Taxpayer Identification Number (TIN)?
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