I try to do paperwork at least once a week. I don't really subscribe to the theory of handle each paper once -- that actually seemed a bit less efficient than doing all of the filing once a week. I do try and keep my accounting up to date so that I know where I am in terms of income, but the last month I've been a little delinquent in doing that.
But, I spent a little time yesterday to get caught up. Since my bank statement should be here tomorrow, its reconciliation time -- which I absolutely hate.