Delaying retirement doesn't increase Social Security spousal benefits

“The calculation of Social Security spousal benefits works differently from the calculation of retirement benefits, writes Mary Beth Franklin. For each year a worker delays taking retirement benefits beyond full retirement age up to 70, the benefit is increased 8%. The delayed-retirement credit doesn't apply to spousal benefits.” Source: Investment News
More info from Ray Martin at MoneyWatch: http://www.cbsnews.com/8301-505146_162-57583321/the-lowdown-on-social-security-spousal-benefits/