How Sales Tax Works in Watertown
South Dakota taxes most goods and many services, from repairs to landscaping, and Watertown adds city tax on top. Sellers must file on time even for periods with no sales. For the city's manufacturers, use tax on purchases is just as important as tax on sales. BOMCAS prepares and reviews these returns for Watertown businesses remotely.
Statewide registration and taxable-service rules are explained in our South Dakota sales tax overview. Watertown's rates, its hotel district charge and lake rentals are covered here.
Rates
- State sales and use tax: 4.2 percent, rising to 4.5 percent on July 1, 2027 under current law.
- Watertown municipal sales and use tax: 2 percent, code 379-2.
- Watertown municipal gross receipts tax: 1 percent on lodging, alcohol, eating establishments and admissions, code 379-1.
- State tourism tax: 1.5 percent on lodging under 28 days and certain visitor services.
- Watertown Business Improvement District: $2 per room night at participating hotels and motels with 25 or more rooms.
- No Codington County tax, after voters rejected Referendum 83 on November 3, 2026.
The Hotel District Charge
The Watertown Business Improvement District was created to fund events that bring overnight visitors. It applies to the hotels and motels named in the city ordinance, excludes bed and breakfasts and properties under 25 rooms unless they choose to join, and does not apply to complimentary rooms or guests staying 28 or more consecutive nights. Hotels remit the tax with a signed statement to the city Finance Office by the 20th of the following month. Late payments carry a 10 percent fee, and unpaid amounts can become a lien on the property. These payments are separate from the state sales and tourism tax return filed with the Department of Revenue.
Lake Rentals and Resorts
Owners renting cabins or homes for fewer than 28 days must hold a sales tax licence and collect 4.2 percent sales tax and 1.5 percent tourism tax. If the property is inside Watertown, the city's 2 percent sales tax and 1 percent gross receipts tax also apply, for 8.7 percent. Most lake properties outside city limits charge 5.7 percent. Online booking platforms may collect and remit for some bookings, but owners should confirm which taxes the platform covers and report the remaining sales themselves. Boat, pontoon and equipment rentals and guided fishing trips are also taxable.
Manufacturers and Use Tax
South Dakota does not have a broad manufacturing exemption for equipment, so Watertown plants generally owe sales or use tax on machinery, tooling, supplies and many services they buy. Materials that become part of a product sold are purchased for resale and exempt. When equipment is bought from an out-of-state seller who does not charge South Dakota tax, the plant owes state and city use tax. Use tax is a frequent audit issue, so we review fixed asset additions and large supply accounts against the use tax reported. South Dakota does offer a refund program for certain large new or expanded facilities, which should be reviewed before a project starts.
Contractors
Prime contractors in South Dakota pay the 2 percent contractor's excise tax on their gross receipts from construction projects, and generally pay sales or use tax on materials. Residential builders in Watertown must also hold the annual city residential contractor licence, which requires an excise tax number. For projects for government or tax-exempt owners, the treatment of materials can be different, and we review contracts and exemption documents.
Selling Into Minnesota
Minnesota's general rate is 6.875 percent, plus local taxes. Watertown businesses with employees, inventory or regular deliveries into Minnesota have a physical presence there and must register. Remote sellers without physical presence must register once retail sales into Minnesota pass Minnesota's economic nexus threshold. Minnesota also taxes some items that South Dakota does not, and vice versa, so we review product and service categories before setting up collection.
Our Process
We reconcile sales from your point-of-sale or accounting system to each return, check city codes, keep exemption certificates on file, and prepare filings by the 20th, or the 23rd for electronic filers. If you have missed periods, we prepare the overdue returns as well.
Watertown Sales and Use Tax Questions
What sales tax does a Watertown hotel charge?
For stays under 28 nights, 8.7 percent: 4.2 percent state, 2 percent city, 1 percent gross receipts and 1.5 percent tourism. Participating hotels with 25 or more rooms also charge $2 per night for the business improvement district.
What tax applies to a lake cabin rental outside the city?
Generally 4.2 percent state sales tax plus 1.5 percent tourism tax, for 5.7 percent, on stays under 28 days.
Do manufacturers pay tax on new equipment?
Generally yes. South Dakota does not broadly exempt manufacturing equipment, so sales or use tax usually applies.
Is there a Codington County sales tax?
No. Voters rejected Referendum 83 in November 2026.
Talk to BOMCAS About Sales and Use Tax in Watertown
Filings depend on books that keep collected taxes out of revenue, and the same sales support the business return. Missed periods go through catch-up filing, purchases around July 2027 are a planning question, seasonal staff run through payroll, rental owners also need personal returns, and Canadian owners should see cross-border tax. For the statewide picture, read our South Dakota pages on business tax, individual tax, bookkeeping, payroll, tax planning, catching up on filings and cross-border tax, or begin with the South Dakota overview.
Send BOMCAS a short note about your Watertown business or household and we will reply with next steps and what we need for a quote. Use the contact page or the form below, call 780-667-5250 or write to info@bomcas.ca. The Watertown overview lists all our local services. This page is general information, not advice for your own facts.