Not too hard.  Drake has good conversion software for ProSeries, but double check any depreciation items after converting. We started using Drake for entities a few years ago because we couldn't justify the cost of ProSeries' unlimited entity software, and their pay-per-return prices are ridiculous.  Drake is easy to use.  We never have e-file reject problems like this Form 4136 issue.  IRS acceptances are also returned much faster on Drake, and they do not compete with us or expose electronic files to additional risks by selling their software to the general public. We've considered converting our Form 1041 clients as well, but ProSeries handles depreciation better.  Some of our farm clients have a pretty long list of equipment, so we are still using both.