How to calculate rates as a sub-contractor
Warning: this might be a wildly frustrating confusing read, I apologize in advance.
Background: I worked as a redseal journeyman plumber for a company for 15 years. I was paid hourly at $42/hr, received 3 weeks vacation, and basic minimum health benefits.
I recently left my job to pursue my own business. I mostly flat rate quote all my work, however I work it out so I earn $125/hour minimum (on smaller jobs that cost me travel time I make it $150/hour)
I’ve worked out most of my monthly expenses which include
Fuel: $400
Vehicle payment: $500
Vehicle insurance: $117.24
Liability insurance: $215.91
Disability insurance: $150-$200 (I am currently deciding between premiums)
Bonding fee: $9.72
Bank fee: $6
Invoicing software: $22.40
Total: $1422
Disclaimer: There’s a few more I haven’t added for example I haven’t switched my personal family plan phone into a business plan yet, and I haven’t calculated things like vehicle maintenance, cpp, accountant fees, life insurance (haven’t picked a plan yet)
My hourly overhead per month works out roughly:
(160 hours is based on 8 billable hours per day working subcontracted, 100 hours based on 5 billable hours working just under my own company as I can’t charge travel / supplier time directly to customers)
160 working hours: 1422 / 160 = $9 (round to $10)
100 working hours: 1422 / 100 = $14 (round to $15)
Given these overhead numbers, how do I apply this to a fair hourly wage to my old boss when he wants to subcontract me out for work? I assume it’s customary to charge less than my regular rate as they are providing the work and dealing with billing the customer, however I need to charge enough so it’s not a loss on my end.
I was thinking $70/hr is fair as that’s 42 (my old wage) plus $10 (my overhead providing I’m billing 8 hours a day) then $18 padding to cover the rest of things I’m missing out on like employer benefits vacation, job security, etc.
Can any people who subcontract or tradespeople I. Similar scenarios share how they calculate their rate?
Ps sorry for my crazy math, it’s not my strong suit and I’m trying my best to do the work without asking strangers for complete assistance. Thank you