Destitute (0 gp/month): The PC is homeless and lives in the wilderness or on the streets. Common financial situation for those that live in Ground: 9th. Keep track of every copper.
Poor (3 gp/month): The PC lives in common rooms of taverns, with his parents, or in some other communal situation. Majority of those that live in Ground: 9th, and some in Lower: 7th-8th. Keep track of silver.
Average (10 gp/month): The PC lives in his own apartment, small house, or similar location. The standard for those that live in Lower: 7th-8th. Keep track of gold.
Wealthy (100 gp/month): The PC has a sizable home or a nice suite of rooms in a fine inn. The majority of those that live in Mid: 4th-6th. Keep track of platinum (10 gold).
Extravagant (1,000 gp/month): The PC lives in a mansion, castle, or other extravagant home—he might even own the building in question. This is the lifestyle of most that live in Top: 1st-3rd. Keep track of purchases larger than 100 gold.
Wastefull (10,000 gp/month): :)
Prices are based on http://www.d20pfsrd.com/equipment—-final/goods-and-services