How much do you really need to set aside for retirement?

The rate of retirement savings is inching upward. “Nearly a third of companies that use automatic 401(k) enrollment now start workers saving at 6% of their salaries or higher,” said The Wall Street Journal, citing a report by Vanguard Group, which is “about double the share of organizations that did so a decade ago.”

Previously, said the Journal, setting a default contribution rate of 6% was “considered too onerous for younger workers and too paternalistic by those who favor leaving decisions to individuals.” But now, companies are seeing this as a nudge in the right direction for employees saving for retirement — and taking advantage of employer matching contributions. These shifts raise the question: How much do you really need to save for retirement?