I have raised my prices 10% across the board, each year, for the last three years.  Folks are 'warned' in the client letter that goes with their organizer.

I've lost THREE clients due to the price increase, maybe a couple more that just didn't re-appear.  Some of the *didn't re-appear* were ones I told to stop withholding as the only reason they had to file was to get all the withholding back.  I told them, if they did want to file just for identity theft or statute of limitations....IRS Free File was a great thing to use.