You'll need a little more info, but here's how I would do it
- Calculate annual average client revenue (annual service revenue/active clients)
- I would probably just include services here and not product sales
- Calculate annual average client cost of services
- Include cost of service goods (dye etc) (annual cost of goods/active clients)
- Average hours per service * your rate
- add these two numbers together to get average client cost
- Subtract the two numbers to find out average profit per active client
- Figure out how many active clients are in the book
- Multiply profit per active client by active clients
- Don't pay more than 50% of that number
- 50% because you need to have cashflow in your first year. This is a one time cost so after the first year it won't impact you anymore