Finance & Business 

This interactive federal tax calculator is an easy tool that you can use to figure out your federal tax on your taxable income.

Enter your taxable income in the highlighted field bellow and click the button to see how much taxes you have to pay on your income.

Understanding the concept of the marginal and average tax rate is beneficial to single individuals as well as to couples.

Individuals can benefit especially from tax-year optimization. Making a decision about a sale of mutual fund investments or taking a lump sum from your pension plan this or next year can make a difference in how much taxes you pay.

The Alternative Minimum Tax (AMT) concept was designed to hit the wealthy individuals who often have the resources and are trying to avoid paying taxes. In layman terms, the alternative minimum tax (AMT) was designed to keep the rich from living tax-free.

The Big Mac index 2009 compares the price of a Big Mac sandwich across countries. The Big Mac 2009 index published by the Economist is a lighthearted guide to valuing currencies. The Big Mac index 2009 is not the best indicator of international comparison but it can provide some clues.

How to tax the economic stimulus rebate check that you received last year? The deadline for tax returns is approaching, and if you need to know how to tax or how to pay taxes on the economic stimulus rebate check that you received last year, you can find the answer to your question below.

2010 federal tax rates provided on this page are applicable to income earned in 2010. You can use these 2010 federal tax rates and federal tax tables 2010 provided below to calculate your taxes that you report on your tax return due in April 2011. These 2010 federal tax rates apply to taxable ordinary income. This page is being prepared and will be available in mid 2010.

Option theta is one of the sensitivity parameters used in option theory to measure responsiveness of an option to change in time. Option theta is often represented by Greek symbol Θ. Option theta belongs to a group of option sensitivity parameters together called "Greeks".

Option vega, represented by Greek symbol ν (nu), is a mathematical tool used to capture the responsiveness of option value to changes in the volatility of option's underlying asset's value. In other words, option vega is option's sensitivity to fluctuations in the underlying asset price.

Option gamma, often expressed using the Greek letter Γ, is a mathematical tool used in the option theory to explain the relationship between the value of an option and the price of the underlying asset. Option gamma is the option's sensitivity to change in the sensitivity of the option value to changes in the underlying asset price.

The calculator below relates to the Black-Scholes model which is explained in detail on the Black-Scholes model page. You can use this calculator to find the value of a European call option using the Black-Scholes formula. This model is subject to assumptions discussed on the Black-Scholes model assumptions page.