For all of 2012, I was a 1099 contractor. Then, as of the beginning of January 2013, I switched companies and I am now a full time W2 employee.

After doing my taxes, I received a refund, but I am expected to still pay estimated taxes. If my W2 withholdings at my new company throughout the upcoming year covers the quarterly estimated taxes owed in each quarter, should I still be paying the estimated taxes?

Estimated taxes are paid by individuals who either:Expect to receive income not subject to tax withholding or Do not expect a sufficient amount of taxes to be withheld from their income. So UNLESS a sufficient amount of taxes were withheld from our paychecks, you do not need to pay quarterly estimated taxes. As you work for an ER, the ER is responsible for withholding the appropriate amount from your paycheck each payday. Some individuals, however, must file quarterly tax returns, and make quarterly payments to the IRS to cover any taxes due. SO, most EEs who have federal and state income taxes, Medicare taxes, and Social Security withheld from income as part of payroll generally do not have to pay estimated taxes on that income. These withholdings can be seen at the end of the year on W-2 statements. However when an EE has additional sources of income, such as a side consulting business, rental property income, or significant stock transactions or dividend payments, estimated tax payments may be required.