Could You Be Oversaving for Retirement?
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How many times have Americans been told we’re not saving enough for retirement? That we’re going to outlive our savings? So many times that some of us have grown used to the idea that we’ll never stop working.

But new research from Morningstar published this week finds that our retirement prospects aren’t as bleak as those countless surveys say.

David Blanchett, head of retirement research for Morningstar Investment Management, tested three assumptions financial advisors and retirement calculators use to come up with a retirement goal — often thought of as our magical “retirement number.” He found that they often rely on a generic formula that could lead some workers to oversave for their golden years by as much as 20%.

“There are three common assumptions that many software tools and financial advisors use to come up with a retirement savings goal—a 70% or 80% replacement rate based on pre-retirement income, an income need that rises with inflation, and a 30-year retirement time horizon,” Blanchett says. “When we looked at actual retiree spending patterns and life expectancy, however, we find that these assumptions don’t hold true for many people and, on average, can significantly overestimate how much people will actually need to fund their retirement.”

The 80% rule

The  80% replacement rule — which means workers should aim to replace that much of their pre-retirement income —  is hardly a one-size fit-all model. Blanchett argues that the figure may be much lower for some workers, considering that some expenses, like taxes for Social Security and Medicare, work-associated costs like commuting, and pre- and post-tax retirement savings contributions all but disappear once you retire.  On the flipside, it could wind up being higher for other workers, especially if they live in a state with a high income tax or expect to put their grandchildren through college.

When Blanchett looked at four households earning between $37,500 and $225,000 a year, and factored in what they would need to have once they were no longer paying for these expenses in retirement, he found their ideal replacement rates varied widely — as low as 54% and as high as 87%.

“Although a rule of thumb replacement rate of 70% to 80% is clearly reasonable, it isn’t ideal, and moreover, it is clear that the replacement rate is sensitive to the proportion of pre-tax expenses and post-tax expenses,” he says.

The point is to be sure your ideal replacement rate is calculated in the most personalized way possible. If you’re using a retirement calculator, make sure it takes into account those expenses you’ll no longer incur once you stop working and any significant expenses you could wind up paying for down the line. A good financial advisor will ask you these questions as well.