So it sounds like you (obviously) have a large enough account in your brokerage
to either pre-pay tithing for a year or make a 1-time tithing payment (at whatever point of the year you feel necessary). I assume this is what you would recommend for everyone?
Secondly, how do you track your chunk of investments to know your purchase price?
Just keep an excel doc with purchase date and price?
Can you specifically direct the sale of shares that were purchased in order to maximize a loss (tax loss harvesting) or an increase?
The specifics of this and details are still a bit over my head.