Whether you’ve put off planning for retirement altogether or failed to create a truly comprehensive plan, you’re putting yourself at risk for a future of poverty, penny pinching, and dependence. The stakes could hardly be higher.

When preparing for your final years, it’s not enough to simply hope for the best. You should treat retirement planning as if your life depended on it—because it does. To this end, even well thought-out plans can contain fatal flaws you might not be aware of until it’s too late.

Have you committed any of the following three deadly sins of retirement planning?