When you place a trade, your OBP is reduced by the "Buying Power Effect" (BPE): What Is Options Buying Power? - tastylive
Your available OBP depends heavily on your account classification: option buying power td ameritrade
OBP is calculated based on the projected maximum loss of your total portfolio rather than individual positions. This often allows for significantly higher leverage (up to 6:1 or more) for advanced strategies. Common Strategy Requirements When you place a trade, your OBP is
With the transition of accounts from TD Ameritrade to , OBP is now managed through the Schwab platform, though the core thinkorswim engine still handles the underlying calculations. Core Calculations by Account Type Common Strategy Requirements With the transition of accounts
OBP is strictly equal to your settled cash . You cannot use margin or leverage; you must pay the full premium upfront for any option purchase.
OBP is generally your Margin Excess —the equity available after satisfying initial margin requirements for your existing positions.