Background Info:

We are looking to find a way to recover and more importantly track our purchasing tax, in our state they require us to pay a 6% tax when buying materials. 

We have been estimating without considering this and then specifying these numbers in the purchase receipt. This will then divide it between all the materials on the receipt and this is skewing our numbers. 

We are not wanting to make a 6% General Condition and charge our clients this on other items such as labor, subs, equipment, and other. We are only wanting to recover our cost of 6% on only materials.

Example:

• Say we estimate $10,000 in material cost for this patio with a line item $500 for freight. 
• The receipt is $10,000 for the stone, $600 for tax, and $500 for freight. 
• This will then make the $10,000 into $11,100 and show we are over in materials.

Question:

Is there a way anyone knows to set up the system to automatically charge a 6% fee on only materials and then add that number to the associated work areas?