Do you mean in a business sense of for a personal budget?
The business as an accountant to handle the financial side of things, they will take care of the income and expenditure and flag up any possible overspending on a month by month basis. As long as the bottom figure stays in the black your ok.
On a personal level, I have two bank accounts, one for saving and one for bills and everyday living. Once the bills are paid, I transfer half of what's left into the savings, the other half I then have left to spend. It's a pretty basic method I admit but it works for me.