Is a cash deposit available in today's Buying Power?

Yes. Funds deposited today will be considered part of Previous Day Equity with Loan Value, once they have cleared all appropriate funds and banking channels and have been posted to the account.

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What is the difference between Available Funds and Buying Power?
Are the finds I deposited today considered for buying power calculations?
What is Previous Day's Equity with Loan Value?
When will I be able to use the proceeds from a closed Futures position to trade securities?