A crash course in self-employment taxes, tax forms involved, and estimated payments.

Self-employment taxes are discussed here.

Some factors to consider when computing estimated tax payments.

If you had income not subject to withholding, such as self-employment, capital gains, interest, dividends, gambling, or whatever, you might want to find out now whether you are required to make estimated income tax payments rather than get stuck later with an underpayment penalty.

Paying those pesky estimated quarterly taxes.

IRS Publication 505 Tax Withholding and Estimated Tax from the Department of Treasury Internal Revenue Service.

IRS Publication 533 Self-employment tax from the Department of Treasury Internal Revenue Service.

State, federal, Social Security and Medicare taxes information. Factors to consider when taking a home-office deduction, business expense deductions, automobile expense deductions, and health insurance deductions.

Common questions and answers on Self-Employment.

Quick Reference Guides and essentials.

If you're an independent contractor or have your own business, you are self-employed and probably owe self-employment tax.

This is an official web site of the Social Security Administration. The document is SSA Publication No. 05-10022.

1099 statements list all the investment income you receive in a year. You can save on taxes by following these tips on how to report this income on your tax return. By Jeff Schnepper.

Excellent summary of self-employment tax, reporting it, and estimating it.

The Underpayment penalty facts.

Tips and tools regarding self-employment taxes.