A Look at Systematic Withdrawals This calculator may help you estimate how long funds may last given regular withdrawals. You are viewing this website at a small screen resolution which doesn't support calculators. Click here to view this calculator. Have A Question About This Topic? Name Email Address Message Thank you! Oops! Related Content Making a Charitable Gift Did you know that there are benefits and limitations when you decide to donate stock? Learn more about your options. A Brief History of Estate Taxes Federal estate taxes have long since been a lucrative source of funding for the federal government. Where Will Your Retirement Money Come From? Retirement income may come from a variety of sources. Here's an overview of the six main sources.