Should I pay down debt or invest my monthly surplus?

When you receive some extra money it may be difficult to determine whether you should invest the funds or use them to retire debt. Financial theory recommends that if your after-tax return on investments is greater than your after-tax cost of debt then you should invest. However, remember to consider the inherent riskiness of the investment you select (i.e. you may lose the money you invest yet still have obligations to pay back the liability). Use this calculator to help analyze your situation.
Rates and Assumptions
Interest rate on debt (%) 
Is the interest deductible? 
Before tax return on investment (%)help
Is the interest taxable? 
Marginal tax bracket (%)help
Monthly funds available ($) 

This information may help you analyze your financial needs. It is based on information and assumptions provided by you regarding your goals, expectations and financial situation. The calculations do not infer that the company assumes any fiduciary duties. The calculations provided should not be construed as financial, legal or tax advice. In addition, such information should not be relied upon as the only source of information. This information is supplied from sources we believe to be reliable but we cannot guarantee its accuracy. Hypothetical illustrations may provide historical or current performance information. Past performance does not guarantee nor indicate future results.

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