Extra Expenses is family expenses, which can be negative, meaning you're making money, if you have an outstanding bailiff. If someone has super skills, family expenses can be as low as 30%. The average family expenses are at 89% of Surplus. Remember, if your spouse has better skills, AND a higher leadership rating, she has the effect on family expenses. 14th century nobles were outrageous spendthrifts and their wives were often the worst offenders.