In reference to the title, I contribute to an investment "Individual Taxable Account", which is a non-IRA portfolio. If < $2500, do I include this in my tax report?

What?  You only report taxable investment accounts when you sell something.  What did you do?  Buy something?  You dont report buying.  Just dividends, interest and sales.  Why are you asking?

I guess the title wasn't include in the posting... lol I have not sold, but dividends get applied to my account sporadically. (i.e. Dec. 26th, 28th; Jan. 2nd, 4th, 5th). I was asking this because I wasn't sure if I was missing anything. Thank you for your quick response VolvoGirl! It just so happens I own a Volvo. 🙂

You dont get dividends that often.  Maybe one a month or quarter.  Is this deductions from your paychecks?  You will get a 1099Div or 1099Int to report on your tax return.  You get a 1099B for sales.  You dont enter from the account statements.  Where is this account?  You might get a consolidated tax statement.  That will have sections for 1099-Int and 1099-Div and 1099B. You need to enter each section in the right place.  So read it carefully and look for headings…1099-Int for interest or 1099-Div for Dividends and 1099B for sales.

The 1099s for investments dont come right away.  Sometimes they dont come until late February.

Okay thank you for your help. I am investing using Betterment and I have asked a question to financial representatives there in regards to how people typically handle their tax reports for their "Individual Taxable Account".

Betterment makes transactions on your behalf! so you probably have been buying and selling.
As volvogirl stated, look for the consolidated 1099 which will have the two or three sections you need to report.
Interest income (1099-INT) is unlikely.

Automatic or manual contributions to a taxable account are not reported anywhere on an income tax return.  Only income derived from these investments are reported.  You should be receiving tax documents form Betterment that may include 1099INT, 1099DIV, 1099B,  etc.  Many brokerage firms don't get their tax documents out until the latter part of February