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37 C.F.R. §7.39(c)

If the affidavit or declaration is filed within the time periods set forth in section 71 of the Act, deficiencies may be corrected after notification from the Office, as follows:

• (1) Correcting deficiencies in affidavits or declarations timely filed within the periods set forth in sections 71(a)(1) and 71(a)(2) of the Act.  If the affidavit or declaration is timely filed within the relevant filing period set forth in section 71(a)(1) or section 71(a)(2) of the Act, deficiencies may be corrected before the end of this filing period without paying a deficiency surcharge.  Deficiencies may be corrected after the end of this filing period with payment of the deficiency surcharge required by section 71(c) of the Act and § 7.6.
• (2) Correcting deficiencies in affidavits or declarations filed during the grace period.  If the affidavit or declaration is filed during the six-month grace period provided by section 71(a)(3) of the Act, deficiencies may be corrected before the expiration of the grace period without paying a deficiency surcharge.  Deficiencies may be corrected after the expiration of the grace period with payment of the deficiency surcharge required by section 71(c) of the Act and § 7.6.
• (d) If the affidavit or declaration is not filed within the time periods set forth in section 71 of the Act, the registration will be cancelled.