Can I trade U.S. Savings Bonds?

IBKR does support short sales in U.S. Corporate Bonds and U.S. Government Securities (e.g., Bills, Notes, Bonds) if the following conditions are met:

• You have a Margin account
• You have approved U.S. Bond trading permissions…

IBKR does not support participating in primary bond issuances or when-issued trading.

If IBKR supports clearing the bond, and has liquidity providers for it, then it will be available once trading in the secondary markets. …

IBKR clients are not able to hold a private placement investment. In general, you can only hold securities that are trading in the secondary market.

You can find available products for trading on the IBKR website, clicking on Products followed by Product Listings…

No, option trades on FOPs do not count as a day trade as they are considered commodities. Only trades on US or non-US securities (Stocks, Stock and Index Options, Warrants, T-Bills or Bonds) count as a day trade. 

You can find an Overview of Pattern Day Trading ("PDT") Rules…