Chinese elm - chop this year?

[JoB]

This is a poor picture, but can't pull it out for a decent one as it is -3 at the moment. Would it be best to chop this one this year ( at the small branch down low) or should I wait for another year? I am in no hurry with this but do not want to leave it and then find that next year the cut will be huge, this was a small twig last spring and grew like a weed

 

[Bonsai Nut]

Chop when your trunk is as thick as you want it to be. Once you reduce the height of the tree trunk thickening will slow to a crawl.

 

[JoB]

Thanks , I will wait