Until last week, I would have said most clients filed by the original April 15 deadline, but in the last week, in addition to my few regular clients who I knew had decided to take advantage of the extension, I've been approached by several new clients who waited until the last minute of the extension to seek a new tax accountant.  I took on as many as I could, but when you are a small business, it's important to not take on more than you can reasonably process!  The difficulty is running quick estimates a new client should pay by the 15th while going on extension to file. I'm not sure where the influx of new clients all came from, but I expect even more next year, due to an increasing number of newly self-employed, who will no longer feel comfortable filing their own taxes when it involves a Schedule C and more complicated scenarios.