Clients' money can be defined as any money held or received by the firm, which does not solely belong to the firm. This is money held in trust by a member on behalf of third parties and which is not due to the member or his firm (received by cash, cheque, bankers' draft, electronic transfer).
Examples of clients' money are: tenant's deposits, rents, service charges, interest and proceeds from sales at auction etc. If you hold fees in advance of completing work this may also be categorised as clients' money.