The Members Expenses Scheme is the structure under which MSP's are reimbursed for expenses incurred in the carrying out of their Parliamentary and constituency duties.
The purpose of the Party Leaders' Expenses Scheme allowance is to provide support to qualifying party leaders while carrying out the extra duties associated with that role.
The Members Expenses Scheme sets a maximum limit on certain costs that Members can claim in any financial year.
Detail of the previous Members Expenses Scheme and Allowances Schemes.
Section 97 of the Scotland Act 1998 provides for an Order in Council to allow the SPCB to provide assistance for opposition parties (link: http://www.legislation.gov.uk/ukpga) by making payments to registered political parties in the Parliament