Budget - Monthly or Yearly?

[Chris Henderson]

I’m setting up expense only annual budget for 2015 and would like some
advice.

Is it better to setup the budget Annually or monthly? I only care about
what I spend in total every year, not what I spend every month. Some items
are hard to gauge monthly (even with the estimate option) - gas, grocery,
postal, brokerage, clothes, parking etc.

Are there any benefits in filling up the monthly expense categories in
detail?