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

Important Notice- KTLLP Office Lobbies Closure

As are most CPA firms in the country, for the safety of clients and staff, we are closing our office lobbies starting this Monday, March 23.  For the remainder of this week, March 20-21, we are asking clients to drop off their tax information to our front desk Friday from 7 a.m. to 5 p.m. or Saturday from 8:00 a.m. to noon.

If that’s not possible, we do have other options.
Electronic File Transfers– will allow you to send documents securely. Visit the button on under Client Portal. There is also a button with Client Portal instructions if you need assistance. Please do not use normal email to send documents with sensitive information. This is the quickest delivery method.

Office Drop Box- there are drop boxes located at the following offices, Rapid City (drop box by employee entrance just east of our normal front door), Spearfish (slot at back door, if documents don’t fit please call front desk to make arrangements), and Custer (slot at front door). During business hours the breezeway in the Gillette office will be open to document drop offs.

U.S. Mail- is also a great option in lieu of coming to our physical office.

PLEASE NOTE: all mail and dropped off documents will be quaratined for 48 hours.

We encourage you to conduct as much business virtually as possible, including rescheduling in-person meetings to phone or video calls.

Rest easy. The tax deadline has been extended to July 15, and that is when payments are due.

If you pay taxes quarterly, the first quarter 2020 payments are not due until July 15. 

We believe you will not need to pay any 2020 quarterly taxes until July 15. We will keep you posted as to the status of your filing. If you have any need to file quickly, please let us know.                

Check our website at and social media for updates related to the pandemic.

We appreciate your cooperation in these trying times.

Denise Webster, CPA, PFS, Managing Partner

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

Latest posts by Ketel Thorstenson, LLP (see all)

Coronavirus, COVID-19, Lobby closure, Tax Season, Tax Services

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.


© 2019 Ketel Thorstenson. All Rights Reserved.