Ok I'm sorry let me try and explain a little better this is making my brain hurt confusing me
I have a small Fire Extinguisher sales and service business my guy works on 50% commissions after any expense's or supplies
So the $20 is the cost of lets say a new fire extinguisher one way or another we or he has to buy that fire extinguisher be it from a supplier but in this case it from me I already bought it and I payed $20 for it. I need to recoup my cost then we can split the profits 50 50.
So the way I see it is if I'm not wrong is if I deduct $20 from the $200 then split the difference $180 - 50% = $90 then its like the fire extg. only cost him $10 and I'm paying for half of it out of my end and I'm not recouping the whole $20 back ?
As Halls of Ivy said way back in the beginning, it depends on what your contract says (even if your contract is verbal and informal).
If your agreement (a contract) is that you and this guy split 50/50
THE TOTAL CHARGE TO THE CUSTOMER, in your example you deduct nothing. This is a bad deal. Suppose the customer is billed $200 and doing the job requires the purchase of supplies that cost $130.Then you split the $200 evenly. You get 100 and he gets 100. If you bought the supplies, you lose $30 because you paid out $130 and got only $100. If he bought the supplies, he loses $30. Someone is going to lose his shirt in this kind of deal.
What is sort of common is a different kind of agreement. You split 50/50
THE DIFFERENCE BETWEEN THE TOTAL CHARGE TO THE CUSTOMER AND THE COST OF MATERIALS USED FOR THAT JOB. I am guessing that is what you and this guy agreed. You don’t pay mileage for him to go to the customer, and he doesn’t pay part of the utility bill for your office.
So if the customer is charged $200 and the cost of the materials is $20, then what is to be split is 200 - 20 = 180 because that is the agreement. And half of $180 is $90. If he bought the matetials, he gets $110. If you bought the materials, you get $110. Whoever is out of pocket for the materials gets back every penny of what they cost.
I completely do not understand your feeling that if you supply the materials that cost you $20 and you get $90 plus $20, that somehow the other guy is getting the materials at half cost. You get your full $20 back.
What you do not get is your normal mark-up. If your normal mark-up is 80%, you would normally get $36 for selling that item. That is a gross profit of $16 that you forego in return for your $90 share of business that you otherwise might not get any piece of it all. If you are supplying most of the materials (and why. wouldn’t you be when you are supplying materials at such a good price), it might or might not be good for both of you to change the percentage split while also paying you for materials supplied to you at cost plus a reduced mark-up.
This is what contract is all about. You find something that makes you both happy and stop arguing about what is “fair“ like three year olds. And when one of you decides that you are no longer happy, you make a new agreement if you can.