You will need two figures to complete this area:
Purchase Price: Quite simply the amount you are paying for the business.
On Costs: All costs associated with the Business Purchase excluding the Purchase Price. This would include any lawyer costs and government taxes or charges.
Default: If you are unsure as to what the "On Costs" would be, then just estimate. The system defaults to a 2% of Purchase Price charge, you may use this to start the process.