Correction: This post initially conflated the upcoming battle over raising the government's debt ceiling, with the dispute between the House and the White House over funding of Obamacare. The Oct. 1 deadline is for passing a budget or continuing resolution to keep the government functioning. The debt ceiling must be raised by Oct. 17.
If Congress doesn't pass new budget by Oct. 1 the government will shut down, which would add ruin to an already ruined economy. Republicans are holding the budget hostage to force a one-year delay in the implementation of Obamacare--which would serve their candidates well in the mid-term elections in which there are 33 U.S. Senate seats at stake.
Sen. Ted Cruz of Texas, one of the most conservative of the Tea Party-brand Republicans, attempted a filibuster this week to literally try to talk Congress into shutting down the federal government.
No one knows what exactly in government would get shut down in the event of it not passing a budget. Shutdowns happened 15 times between 1977 and 1996. They've ranged from as short as three days to 21 days. In these events, some so-called non-essential workers were furloughed or temporarily laid off, but when work resumed, they returned and received back pay.
The same would happen here. Someone in the federal government would have to determine which staff members it could afford to keep and which are temporarily disposable. Some have written that that would be left up to Obama's discretion. The Obama administration sent a memo to federal agencies telling them that "prudent management requires that agencies be prepared for the possibility of a lapse."
While it's not clear right now how each department and agency will respond to a lapse in funds, and what staff and services they will find non-essential. Here, a few things we can count on happening based on past experiences: