A method of managing financial object(s), on a computer, including but not limited to managing a virtual portfolio of the objects where the portfolio may include a collection of objects managed collectively but tracked separately with separately owned lots on behalf of investor(s); providing a database associating lot(s) owned by each of the investors and associating the lots as tradable regardless of initiator of the purchase; providing lot selection rules; receiving a requested trade; selecting a lot for trading using the database, the lot selection rules, and the requested trade; providing taxation rules; determining if a trade using the selected lot should be deferred; generating a deferred trade in a tax-managed sub-account if it is determined that the requested trade should be deferred; and selecting the deferred trade in the sub-account for execution if the deferred trade should no longer be deferred using the database and the taxation rules.