For my place, we've drastically overspent the budget to the point that even if Congress gets the budget passed, it's still too late for us to settle accounts in time without financial consequences. So, in order to save $, they are basically going to furlough some of us and then pay our salaries for not working after the accounts are settled after Treasury hits. This happened due to Cruz Control two years ago, and outside the essential personnel, the people who were furloughed basically gave up two paychecks for a 0% interest rate loan to be paid the month after, in exchange for not having to work for those two paychecks. Again, you get paid not to work for as long as a furlough is in effect, but you can't collect on the paycheck until the furlough is done. It's apparently (according to my Office of the Budget counterparts) literally cheaper to do that than to pay the associated penalties for late payment of other obligations.
It's a fantastic deal for people who did enough financial planning such that they can go without a salary for some time (although you get the money back later). But surprisingly, there's quite a number of people who can't afford even that long, so we find dumb things for them to do. On the downside, if we take a page from the Belgians, furloughs could be very long, so those who volunteered would have been screwed as it extended too long. I can be furloughed indefinitely as I have enough personal passive income (and honestly other work) that I could do in the interim. In 2013, I ended up taking a fall vacation with the wife and was very pleased at how nice it was for Ted Cruz to give us that gift for ObamaCare.
For essential personnel (active practitioners), it's exempted out so they still have to work. But for the Anti-Deficiency Act, paper pushers like me basically take a holiday at the taxpayers' expense due to Congressional infighting. What's going to suck is that anyone other than VA and DoD is probably going to have to suffer the 10 day furlough annually again if the budget stays substantially the way it is.