Why does my Kite fund balance not include profits from today?
The available margin on Kite funds only includes credits that are available for your trades.
Due to the upfront margin requirements applicable from September 2020 onward, intraday profits are not made available for trading until settled by the exchange (i.e. on T+1 for F&O and on T+2 day for equity trades).
Let's understand this with an example -
On Monday (T day), you buy stocks worth Rs 2 lacs and sell them the same day for Rs 2.25 lacs, then Rs 2 lacs will remain available immediately for other transactions. However, Rs 25 thousand will be available in your Kite funds on Wednesday (T+2 day).
For context on how settlement works check out this article.