I’ve noticed this pattern in myself that I like to call Automatic Pointless Resistance which is especially active when I’m anxious. I overcome it by completely ignoring my feelings and getting started on tasks regardless of how little I want to do them, or how much I think I’m going to screw them up. Sometimes the disconnect is profound, my brain just doesn’t want to do something but my body knows what to do. Even if it’s something mentally involving like filing taxes, I just ignore any thoughts that say I must be doing it wrong, I should stop and plan it better, etc. And before I know it, the task is well underway and I’m often even enjoying it.

I've found that in times where I can't seem to shake "the blues" that it's best to get out of my head and get into my body by doing something physical. Whether it's a jog, lifting at the gym, or playing a sport...focusing on these activities allows my concentration to shift and seemingly my mind to reset

I have found setting a routine and scheduled time to do it helps. Put it in your calendar and treat it as you would work.

However, if you are finding this to be a consistent and long term issue please see a councilor. They can help and diagnose far better than you will find here. If you find that gets put off as well, ask a friend or family member to help you make and keep the initial appointments. You may be surprised by the number of people that are willing to help free of judgement if you will let them.

Auto bill pay is a boon.

Hire a tax preparer. It costs more than doing it yourself, but I find we often discount the cognitive cost of just doing a thing when considering whether to outsource stuff.

In other words, build / use systems to minimize the impact of your own limitations on your responsibilities.

Go see a psychiatrist, and get a caseworker.