Yeah, the deficit one doesn't really work right. But there's a quick way to get an excess.
This works best in countries with quite high unemployment, however - that is, over 15%. If you're under 15% unemployment, be sure to recruit extra doctors, researchers, and educators (possibly also police) BEFORE you do the following.
Pause the game (don't do it within 3 hours of midnight). Go to the industries screen. Put a subsidy of 10000 into the plastics industry but ONLY if you have NO plastics industry; if you have a plastics industry, do it with the tyres industry instead, which you probably don't have. If you have both, then you can try another industry which is NOT active, IE it is marked red and doesn't exist in your country.
Unpause the game for 3 hours (this is why you don't do it 3 hours before midnight), then pause it again, go to the industries screen, and lower the subsidy you just added to 1.
Carry on playing. Within about a week, the industry you subsidised will grow from nothing to being fairly massive, especially if you could do it with plastics. You'll probably make several hundred billion dollars extra, your GDP will grow by up to 900%, and unemployment will fall radically - down to 0.1% if you had fairly low unemployment to start with. That's why you make sure you grow the size of your civil service BEFORE - because you won't be able to do so when you're at 0.1% unemployment.
Congratulations, you have a budget excess.
Downside: inflation will skyrocket (it takes about a year to return to normal), average revenue will increase. Be aware that you need to retain some of that excess because within a year, you're going to get demonstrations by the civil service (police, educators, researchers, etc) demanding pay rises in line with everyone else in the country.
[Edited by Daedalus1123, 10/15/2010 8:30:36 AM]