Mon-Thurs 8AM-5PM , Fri 8AM-2PM  |  605-342-5630  |  810 Quincy Street Rapid City, SD 57701
Office Closure Sign

Reminder: Drop Box Details

Reminder: KT office lobbies are closed but documents can be dropped off using our drop boxes. If items are too large to fit the drop box please contact the front desk between the hours of 8 a.m. to 5 p.m. M-F (all offices), and 8 a.m. to noon on Sat. (Rapid City only).

PLEASE NOTE: all mail and dropped off documents will be quarantined for 48 hours. For quickest delivery use the electronic file transfer feature on the website, click the client portal button.

Ketel Thorstenson, LLP

Ketel Thorstenson, LLP is a full-service firm with 17 partners, over 55 Certified Public Accountants (CPA) and Enrolled Agents (EA), and offices in Rapid City, Custer, Spearfish, SD, and Gillette, WY. KTLLP has a rich history, serving clients since 1936 and a depth of knowledge and experience that clients rely on and trust. The firm offers a variety of services including tax planning and return preparation, audit services, QuickBooks support, bookkeeping, payroll, business valuation, business consulting and estate planning.
Ketel Thorstenson, LLP

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online payments

If you would like to pay an invoice online with a credit card click on the Pay Now button.  Pay_Now_button

You also have the option to pay your invoice electronically via ACH (bank to bank transfer) at no cost to you by completing the ACH form and returning it to your accountant.


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