A negative terminal value would be estimated if the cost of future capital exceeded the assumed growth rate. In practice, however, negative terminal valuations cannot exist for very long. A company's equity value can only realistically fall to zero at a minimum, and any remaining liabilities would be sorted out in a bankruptcy proceeding. Whenever an investor comes across a firm with negative net earnings relative to its cost of capital, it's probably best to rely on other fundamental tools outside of terminal valuation.