Advantages include not having to pay taxes on income depending on the type of non-profit you are and donors can get a tax break on their donations which encourages them to make donatins.
Disadvantages: Lot's of paperwork for the new non-profit applcation for Federal Government and new laws have made it more important than ever to keep GREAT records which should have been the cas anyway, but many non-profits didn't until the government tightened up the rules which was much overdue. Once you get the initial application done (which many get a lawyer to do) it is simply keeping up with tracking services provided and donations recieved and dispersments made and why, to whom and for what etc. which should be done by any business. Other disadvantage is that mos non-profits do not 'sell' things or have a particular income source so they have to apply for grants and compete for resources from grants and foundations and the genera public to operate which means you are at the mercy of donors. But when you think about it this isn't much different that other businsses that compete for income from general public.

pro forma invoice is a DefinitionAbridged or estimated invoice sent by a seller to a buyer in advance of a shipment or delivery of goods. It notes the kind and quantity of goods, their value, and other important information such as weight and transportation charges. Pro forma invoices are commonly used as preliminary invoices with a quotation, or for customs purposes in importation.