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Professional, Prompt, Personable, Pleasant and Peaceful Tax Services since 1993 because

Nontraditional Taxpayers

We're tax specialists.  Click 'Taxpayers' link at top of page and your category.

Financial Services

Get the most out of your money year round.

Tax Information

Find out what you need, deductions and more.

I was in and out within 45 minutes. The service was efficient, thorough, personable and accurate. ATSI always informs me of new things that can save me money.  They ask all the right questions.  Non-taxing atmosphere!

           T. Chinery, Columbia, SC

Since 1995, ATSI has been preparing my financial statements, 1099s and tax returns. As a business owner and investment property owner, I feel they always do a thorough job, ask me questions to see if things have changed from year to year and give me a clean return.

C. Walton, Arlington, IL


Pay for Your Services Online


9300 Two Notch Road

Columbia, SC 29223


888-829-3299 or 803-309-1892

Fax: 877-829-3299

TAX Season Hours

Mon - Fri: 10am - 630pm, 
Sat 11am - 4pm

Non-tax season hours:

Tues & Thurs 10am - 3pm
(Appointments before/after hours welcomed)


9300 Two Notch Rd Columbia, SC 29223

Upcoming Events

IRS Income Tax Extension Deadline 10/16/2017

Filing Deadlines

March 15 - Business Returns

April 17 - Individual Returns
May 15 - Charitable Organizations
October 15 - Extensions Due