| Normally if you're given an advance, no taxes wouldn't be taken out because it'd be considered a loan. Then on the next pay check, the taxes are figured like normal, and then the loan is also deducted.
Commission is only similar to piecework from the point of view that they're based on your output. But commission is generally on sales, as a percent. And piecework is generally a production type thing and is a pay per each one. And both could have a base pay -- i.e. x amount of dollars per week plus the commission.
And yes, sales is part of the P&L statement, usually called an income statement these days. That statement is about what you profited -- and what do you profit off of if not your sales? | 
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