I have a deadline for my current WIP but I do allow myself a certain amount of flexibility. I aim to post a new chapter on the last Sunday of each month but I allow myself a couple of days' leeway if I need them.

I find deadlines helpful for long fics but I prefer to be a bit more relaxed when it comes to one shots and shorter fics. I have a folder of unfinished pieces that I go back to when I need a break or a change of pace. I post the ones that actually get finished when I feel satisfied with them.