10.63—Service of complaint; service of other papers; service of evidence in support of complaint; filing of papers.
        
        (a) Service of complaint—
        
        (1) In general.
         The complaint or a copy of
the complaint must be served on the respondent by
any manner described in paragraphs (a)(2) or (3)
of this section.
    
    
        
        (2) 
        
            Service by certified or first
 class mail. (i) Service of the complaint may
 be made on the respondent by mailing the complaint
 by certified mail to the last known address (as
 determined under  section 6212 of the Internal
 Revenue Code and the regulations thereunder) of
 the respondent. Where service is by certified
 mail, the returned post office receipt duly signed
 by the respondent will be proof of service.
    
    
        
        (ii) 
         If the certified mail is not claimed or
 accepted by the respondent, or is returned
 undelivered, service may be made on the
 respondent, by mailing the complaint to the
 respondent by first class mail. Service by this
 method will be considered complete upon mailing,
 provided the complaint is addressed to the
 respondent at the respondent's last known address
 as determined under  section 6212 of the Internal
 Revenue Code and the regulations thereunder.
    
    
        
        (3) 
        
            Service by other than certified
 or first class mail. (i) Service of the
 complaint may be made on the respondent by
 delivery by a private delivery service designated
 pursuant to  section 7502(f) of the Internal
 Revenue Code to the last known address (as
 determined under  section 6212 of the Internal
 Revenue Code and the regulations thereunder) of
 the respondent. Service by this method will be
 considered complete, provided the complaint is
 addressed to the respondent at the respondent's
 last known address as determined under  section
 6212 of the Internal Revenue Code and the
 regulations thereunder.
    
    
        
        (ii) 
         Service of the complaint may be made in
 person on, or by leaving the complaint at the
 office or place of business of, the respondent.
 Service by this method will be considered complete
 and proof of service will be a written statement,
 sworn or affirmed by the person who served the
 complaint, identifying the manner of service,
 including the recipient, relationship of recipient
 to respondent, place, date and time of
 service.
    
    
        
        (iii) 
         Service may be made by any other means
 agreed to by the respondent. Proof of service will
 be a written statement, sworn or affirmed by the
 person who served the complaint, identifying the
 manner of service, including the recipient,
 relationship of recipient to respondent, place,
 date and time of service.
    
    
        
        (4) 
         For purposes of this section, respondent means the practitioner, employer,
 firm or other entity, or appraiser named in the
 complaint or any other person having the authority
 to accept mail on behalf of the practitioner,
 employer, firm or other entity, or appraiser.
    
    
        
        (b) 
        
            Service of papers other than
 complaint. Any paper other than the complaint
 may be served on the respondent, or his or her
 authorized representative under  § 10.69(a)(2) 
 by:
    
    
        
        (1) 
         Mailing the paper by first class mail to
 the last known address (as determined under
  section 6212 of the Internal Revenue Code and the
 regulations thereunder) of the respondent or the
 respondent's authorized representative,
    
    
        
        (2) 
         Delivery by a private delivery service
 designated pursuant to  section 7502(f) of the
 Internal Revenue Code to the last known address
 (as determined  under  section
 6212 of the Internal Revenue Code and the
 regulations thereunder) of the respondent or the
 respondent's authorized representative, or
    
    
    
        
        (c) 
        
            Service of papers on the Director
 of the Office of Professional Responsibility. 
 Whenever a paper is required or permitted to be
 served on the Director of the Office of
 Professional Responsibility in connection with a
 proceeding under this part, the paper will be
 served on the Director of the Office of
 Professional Responsibility's authorized
 representative under  § 10.69(a)(1) at the address
 designated in the complaint, or at an address
 provided in a notice of appearance. If no address
 is designated in the complaint or provided in a
 notice of appearance, service will be made on the
 Director of the Office of Professional
 Responsibility, Internal Revenue Service, 1111
 Constitution Avenue, NW., Washington, DC
 20224.
    
    
        
        (d) 
        
            Service of evidence in support of
 complaint. Within 10 days of serving the
 complaint, copies of the evidence in support of
 the complaint must be served on the respondent in
 any manner described in paragraphs (a)(2) and (3)
 of this section.
    
    
        
        (e) Filing of papers.
         Whenever
 the filing of a paper is required or permitted in
 connection with a proceeding under this part, the
 original paper, plus one additional copy, must be
 filed with the Administrative Law Judge at the
 address specified in the complaint or at an
 address otherwise specified by the Administrative
 Law Judge. All papers filed in connection with a
 proceeding under this part must be served on the
 other party, unless the Administrative Law Judge
 directs otherwise. A certificate evidencing such
 must be attached to the original paper filed with
 the Administrative Law Judge.
    
    
        
        (f) Effective/applicability date.
         
 This section is applicable to complaints brought
 on or after September 26, 2007.