SaaS Sales Tax in South Dakota
South Dakota broadly taxes SaaS. This state was central to the Wayfair v. South Dakota economic nexus ruling.
If you sell SaaS products to customers in South Dakota, you may need to collect and remit sales tax at 4.5% (plus any applicable local taxes). This applies whether your business is based in South Dakota or elsewhere — what matters is whether you have economic nexus in the state.
Economic Nexus in South Dakota
Following the 2018 South Dakota v. Wayfair Supreme Court decision, South Dakota can require out-of-state sellers to collect sales tax if they meet certain thresholds. The most common thresholds are $100,000 in sales or 200 transactions per year in the state, though South Dakota's specific rules may vary.
This means even if your business is in Ireland, Germany, or another country entirely, you may need to register for sales tax in South Dakota if your sales exceed the nexus threshold.
How to Comply
1. Determine nexus: Track your sales volume to South Dakota customers
2. Register: Apply for a sales tax permit with South Dakota's tax authority
3. Collect: Add 4.5% to invoices for South Dakota customers
4. File & remit: Submit periodic returns (monthly, quarterly, or annually depending on volume)
International Sellers
If you're selling from outside the US (EU, UK, or elsewhere) to customers in South Dakota:
You may still need to register and collect South Dakota sales tax if you exceed the economic nexus thresholds. Being a foreign company does not exempt you from US state sales tax obligations.
Frequently Asked Questions
Does South Dakota charge sales tax on SaaS?
Yes. South Dakota taxes SaaS (Software as a Service) at a state rate of 4.5%. South Dakota broadly taxes SaaS. This state was central to the Wayfair v. South Dakota economic nexus ruling.
What is the sales tax rate in South Dakota?
The state sales tax rate in South Dakota is 4.5%. Local taxes may apply on top of this, varying by county and city.
Do I need economic nexus in South Dakota to charge sales tax?
Yes. Most states, including South Dakota, follow economic nexus rules established by the 2018 South Dakota v. Wayfair Supreme Court decision. Typically, you establish nexus if you exceed $100,000 in sales or 200 transactions in the state per year. Check South Dakota's specific thresholds.
How do I invoice a customer in South Dakota?
Include 4.5% sales tax on your invoice for SaaS products sold to customers in South Dakota. Show the tax as a separate line item. Use our free invoice generator at paytaxfa.st to create compliant invoices.
I'm an EU/UK seller — do I need to charge South Dakota sales tax?
Potentially, yes. If you have economic nexus in South Dakota (typically $100K+ in sales), you may need to register, collect, and remit South Dakota sales tax even as a foreign seller. Consult a US tax professional for your specific situation.