Comparing Investments This calculator compares the net gain of a taxable investment versus a tax-favored one. You are viewing this website at a small screen resolution which doesn't support calculators. Click here to view this calculator. Share | Have A Question About This Topic? Name Email Address Question Thank you! Oops! Related Contents Capital Gains Tax Estimator Use this calculator to estimate your capital gains tax. Red Flags for Tax Auditors Here are six flags that may make your tax return prime for an IRS audit. Tax Freedom Day Assess how many days you'll work to pay your federal tax liability.