From Forbes, an article about tax planning for retirement.

Too often people think about how much income they’ll need to maintain their standard of living without factoring in the impact of taxes. Overestimating taxes can lead you to delay your retirement unnecessarily. Even worse, underestimating taxes can potentially derail your retirement plans since you could end up with  a lot less income to spend than you planned for.

Unfortunately, this is one retirement expense that can be particularly difficult to estimate. That’s because taxes are not only a function of how much income you have but what kind of income and even what state you live in.

You can find the full article here.