Question About Taxes - ESPP Plans

Hi,

I’m fairly new to PP. I’ve been slowly entering in my data for a couple months. And I work for a company in the U.S. where I have an ESPP Stock Purchase plan with a look-back provision. Basically depending on when I sell the shares of my ESPP, I’m taxed differently on the sale.

I’ve been trying to understand how taxes work in PP, and I’ve been struggling. So, I can’t apply the taxes right away when I sell the shares as they aren’t taxed right away. Instead I transfer the funds out to another account, and at the end of the year that’s when I pay taxes. How would I handle this in PP?

If I’m recording my taxes as a whole, I would think I would actually have to start recording all tax sources then to get the most accurate IRR. Meaning I’d have to enter paychecks and so forth. But I don’t fully understand all the math behind the statistics of PP, and what affects what. Any assistance would be appreciated.