Under the headings .....
The Championship/League One and League One/League Two Play-Off Competitions
I24 Subject to Rules I25 and C26 the entire gate receipts of all League Matches and Play-Off Matches (including abandoned or replayed League Matches and Play-Off Matches) shall be retained by the Home Club.
The Premiership/Championship Play-Off Competition
C23 At the end of each Season the Club occupying position 11 in the Premiership (11 in the League) and the Clubs occupying positions 2, 3 and 4 in the Championship (14, 15 and 16 in the League) shall take part in the Premiership/Championship Play-Off Competition to determine which further Clubs, if any, may be promoted and relegated to and from the Premiership and the Championship.
C26 After deduction and retention by the Home Club of 15% of the aggregate of all ticket receipts and admission charges (gross excluding VAT) received or receivable by the Home Club in relation to a Play-Off Match in the Premiership/Championship Play-Off Competition, a levy of 50% (plus VAT if applicable) of the balance, after such 15% deduction and retention, of the aggregate of all ticket receipts and admission charges (gross excluding VAT) received or receivable by the Home Club for or in relation to the relevant Play-Off Match shall be paid by that Home Club to the Company not later than seven days after the date on which such Play-Off Match is played.
Still looks to me that the clubs keep all the gate monies for their home games.