The EFTPS, or Electronic Federal Tax Payment System, is a free, secure tax payment system provided by the U.S. Department of Treasury that allows you to pay by credit or debit card.New Link

The IRS has has a program called FreeFile that allows you to file all of your taxes directly from your computer at no charge.http://www.irs.gov/efile/article/0,,id=118986,00.html Partnered with notable tax companies like H&R Block and TurboTax, FreeFile has certain requirements you must meet to qualify for the program.http://apps.irs.gov/app/freeFile/jsp/index.jsp?ck Contact the IRS or a professional financial advisor for the most up-to-date and complete information regarding state and federal tax law.http://www.irs.gov/ 

If you are planning to use an online tax preparation service like TurboTax, TaxACT or H&R Block's TaxCut, you will have the option to pay your taxes by electronic withdrawal from your bank account or via credit card when you file your return.http://www.irs.gov/efile/article/0,,id=97400,00.html 

For credit and debit cards, the payment option is provided by service provider that charges a small fee based on the amount of payment and the particular provider. The payment will not be disclosed for any reason other than processing the tax payment transaction.http://www.irs.gov/efile/article/0,,id=101316,00.html 

If you are paying at a later date or have filed on paper and wish to pay online, for a convenience charge, you can submit a credit card payment through one of the IRS' e-pay service providers.http://www.irs.gov/efile/lists/0,,id=101227,00.html  

Electronic withdrawal takes money directly from your bank account so you'll need to have your account number and your bank's routing number. Because it cuts out the middle man, there is no service charge. Visit the IRS website to access the necessary forms and steps for the electronic payment option.http://www.irs.gov/efile/article/0,,id=101317,00.html