A business that does not have very much overhead, like a consulting business, lets the owner draw more income from the business without jeopardizing the business than one with lots of expenses. In that case, at the end of each month, you can take for yourself most or all the income left in the account after paying expenses like membership dues, Internet and telephone bills, etc.
However, for example, if you made $2,000 this month, but your expenses were also $2,000, your business actually made $0 and you could not draw from the business. If you put the expenses on credit intending to pay them over time, you would subtract the payment from the total income and the remainder would be available to draw.
Businesses that have more overhead expenses, or fluctuating expenses like supplies and materials, might require you to set aside a cushion of savings in your business account or business savings account. When this is the case, drawing a lower percentage and keeping a stricter budget protects your ability to get what you need to operate your business.