If you are filing your sole proprietor on Schedule C in your personal 1040 return it is a disregarded entity. You and the business are the same. It doesn't matter which "pocket" or account the money paid comes from. Just enter it as normal expenses and purchases.
If you are a sole proprietor or self employed, you don't account for cash, money or loans you put into the business. The schedule C is all your personal income and expenses in the first place. Doesn't matter what account the money came out of. It is not income or an expense. You just enter the gross income you received and actual expenses you paid. If you paid for something you can take the expense. Doesn't matter how you paid it. You deduct the money you put in to the business by entering the expenses you used it for.
