Because I need to know how many money I'll have in the next month.

One month is composed by normal and repetitive expenses but some month have extra expenses (such as holiday, car manteining, ecc).
Extra expenses will reduce my bank savings so I need to know what will be my bank balance after ...

any suggestions?!

Mmh ... I try to explain this better.

Until this moment I used an excel file with all expenses and entries month per month with a planning of 4 month.
So with this tool, I was able to know what would be my situation in the future 3 month.

Now I wanna use your beautiful app to planning my bank ...

Sorry but I can't understand.
I created a unique budget with all my categories (also with salary as a positive entries) and I set a period o 4 month.
But total are not credible.

This is my settings:
Fuel - montlhy budget: 260 - used 80 - remain 180
Extra - montlhy budget: 200 - used 100 - remain ...

Hi
yesterday I bought iCompta for iPhone 3g and it's really a great app.
I added all my entries and periodical expenses and, for tracking my remaining cash month per month, I need to have budget as spent.

f.e.
monthly budget for travel: 300
montlhy entries: 1000
monthly expense (for the rest): 500 ...