The total cost to a company is generally going to be the gross salary figure plus the employers' National Insurance contribution. You should be able to print reports from Sage Payroll (such as the 'Payment Summary History' reports) that show these totals.
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Pearce & Co - Chartered Accountant and Chartered Tax Adviser
There are many other factors which can complicate concepts like "total wages/salary" cost when considering anything other than the simplest and smallest company. This is why usually payroll software doesn't deal in concepts like "total cost" but instead gives a breakdown of payments/deductions/attachments/employer contributions, so that the accountant/bookkeeper can work out total cost using their knowledge of how those elements should be treated.
Complications include (but are not limited to) elements like
