Congress first imposed the first federal income tax in 1862 to raise money for the Union in the Civil War. A 3% tax was fixed on incomes above $600. Those with incomes above $10,000 had to pay 5% in taxes.

After many changes and appeals, the states ratified the Sixteenth Amendment to the United States Constitution, which made possible modern income taxes. For the first time, Form 1040 appeared. People earning above $3,000 had to pay 1% tax on net personal incomes, and those with incomes above $500,000 had to pay 6% surtax.

Today more than two-thirds of the nation pays taxes. People earning less than $20,000 pay no income tax as a group. Payroll taxes for Social Security, Medicare and Unemployment Insurance amount to 7-10% of every dollar. Personal and corporate income taxes are major earners for federal taxes.

Income tax can be calculated in two ways. First of all gross income minus any applicable deductions is calculated, and on this a marginal tax percentage is applied as per the taxpayers income bracket. Then, applicable tax credits are subtracted, which gives the income tax owed.

Refundable tax credits are given if these calculations are in the negative or if the federal withholding tax is greater than the income tax that is actually owed. The taxpayer then gets a tax refund. He could receive one even without paying any federal income tax.

The newer Alternative Minimum Tax (AMT) is based on gross income. This was introduced to prevent people from using loopholes in the tax laws. It is calculated without taking into account certain tax preference items. It also has exemptions and deductions. This higher income base is taxed in two rate brackets of 26% and 28%; this depends on the taxpayers income. Unfortunately the addition of unrealized gain on incentive stock options made it difficult for people who could not come up with cash to pay tax on gains that werent realized. The modified AMT takes into account this problem.

American salaried people usually pay progressive income tax. Non-resident Americans have to pay taxes as per the flat rate. They also have fewer allowed deductions.

If you have all the documents, it is easy to file taxes yourself. However if you are in the higher tax bracket, you may need a consultant to help you. The IRS also helps in filing your returns; call the IRS customer service representatives toll-free at 1-800-829-1040.

The IRS website (www.irs.gov) gives you extensive information. You could also go to websites like About Taxes (www.abouttaxes.org), Complete Tax (www.completetax.com), or World Wide Web Tax (www.wwwebtax.com). Do keep in mind that a little bit of care in documentation goes a long way to filing a tax return without any ensuing problems!