Signature requirement for PAN application: three signatures or left thumb impressions required, properly placed and attested to avoid rejection. Signature requirement for PAN application mandates three signatures or a left hand thumb impression attested under official seal. One signature/impression must overlap the left photograph and form, one must be within the right side box (not on the right photograph), and one must be within the boxed declaration at the end. Noncompliant applications are liable to be rejected.