Just knowing that a professional is handling your taxes reduces stress. Making mistakes can be very costly. In terms of missed deductions or triggering an IRS letter or audit; a tax professional can help eliminate errors and ensure your returns are prepared correctly.
As soon as you have received all of you tax document information.
Drivers licence, social security cards for all persons that will be on the tax return, W-2's, 1099's, all documents of income. Proof of residency and information for dependents.