Financial planners know all too well how difficult it can be to get their clients motivated enough to make the sacrifices and investment decisions that are necessary to ensure a comfortable retirement.

Here’s an interactive slide show detailing five of the biggest threats to even the most well-prepared investor's retirement plan.

According to a recent ING Retirement Research Institute study, 71% of Americans – regardless of age – still lack a formal investment plan to help them reach their retirement goals. And the latest Retirement Confidence Survey from the Employee Benefit Research Institute found that more than half of all respondents are either “not at all” or “not too confident” that they’ll be able to afford the retirement and lifestyle they desire once they’re done working.

This reality is keeping far too many Americans up at night, worrying about an uncertain economic future at a time when they’re living longer, retiring later and – most disturbing for many – have seen the value of their homes plummet virtually overnight.

But what about those clients who have done everything right?

They’ve been working with a financial planner, contributing to their 401(k)s, maybe have a pension in the offing, are saving money at a decent clip and are following the sound investment advice offered by the professionals but, according to Fidelity Investments, there's still a good chance they might not have enough put aside to live out their golden years in style.

Source: Fidelity Investments