Question:
Someone told me that business plans are cheaper, therefore if you have an ABN to go for one. Why are they cheaper - who foots the bill here?

Answer:
Someone told me that business plans are cheaper, therefore - if you have an ABN to go for one. Why are they cheaper

The assumption is that they're more likely to be used, particularly by those who aren't paying for the calls themselves etc. Even if you are self employed, there is a sense in which the tax dept pays part of the cost because its a business expense.