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 How Income Taxes Work A quick look at how federal income taxes work. RE: Retirement How does your ideal retirement differ from reality, and what can we do to better align the two? Red Flags for Tax Auditors Here are six flags that may make your tax return prime for an IRS audit.