The Roth 401k is a retirement account that allows participants to contribute after-tax dollars but then withdrawal tax-free dollars during retirement.

Determining when to retire is a very difficult task. A variety of free retirement calculators are available online that allow users to analyze retirement strategies.
However, these retirement calculators are not all built alike. Different retirement calculators require different information that effects the calculation quality.
 
Key Characteristics of a Good Retirement Calculator
While almost all of the free online retirement calculators will provide a good general retirement statratgy analysis, certain characteristics make some retirement calculators superior.
1. Monte Carlo Simulation
A Monte Carlo simulation utilizes random variables and tests multiple scenarios to calculate the probability …