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 ($) 
The information provided here is to assist you in planning for your future. Any analysis is a result of the information you have provided. Material discussed is meant for general illustration and/or informational purposes only and it is not to be construed as tax, legal, or investment advice. Although the information has been gathered from sources believed to be reliable, please note that individual situations can vary therefore, the information should be relied upon when coordinated with individual professional advice.

Any rate of return entered into the interactive calculator to project future values should be a reasonable average return for the period. Rates of return will vary over time, and generally the higher the rate of return the higher the degree of risk.

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