Thomas dies in the current year and has a gross estate valued at $2,000,000. During his lifetime (but after 1976) Thomas had made taxable gifts of $400,000. The estate incurs funeral and administrative expenses of $100,000 and also pays off Thomas' debts which amount to $300,000. Thomas bequeaths $500,000 to his wife. What is the amount of Thomas' tax base, the amount on which the estate tax is computed?