A link on measuring payback from safety program implementation is available below.
How to Measure the ROI of Your Safety Program
Though, many times it is difficult to calculate the money spent on safety program,cost of accident, benefits accrued by implementation of safety programme, with extra efforts one can calculate and prove that the organization benefits from a safety programme that gets wholehearted support from all.
The link for indicators to be observed is given below. Meaningful quantification of these indicators can help in calculating cost benefits to the organization.
http://www.safetyxchange.org/financing-safety/achievementbased-safety-metrics?utm_source=emailmarketer&utm_medium=email&utm_campaign=3802