Why You Need an Estate Strategy Full Size Version Share | Related Content When Do You Need a Will? When do you need a will? The answer is easy: Right Now. Understanding the Alternate Valuation Date Executors can value the estate on the date of death, or on its six-month anniversary —the “Alternate Valuation Date." What Is My Current Net Worth? Use this calculator to estimate your net worth by adding up your assets and subtracting your liabilities.