Tax law changes

OK, I'm not exactly sure if I follow correctly, but for example --

Let's say Section L of my 2021 K-1 shows the following:

current year net income: 500  (this is the long term capital gain listed in part III 9a of K-1)

other increase/decrease: 1200 (this is my initial investment + other gains received in 2018-2020)

withdrawals & distributions: 1700 (addition of above 2 numbers)

Ending capital account: 0

 

Part III line 19 (Distributions) reads:

A - 1500 (this is the final, and one and only, check that I received for this partnership, in 2021. The land is now sold.)

C - 200

 

So, if we use the example above, then I should say my Cost Basis is 1000? (1200 - 200 distribution).

 

Thank you!