South Dakota gained national tax significance in 2018 as the plaintiff in South Dakota v. Wayfair — the Supreme Court case that allowed states to require online retailers to collect sales tax. SD reduced its state rate from 4.5% to 4.2% in 2023 (sunsetting to 4.5% in 2027). South Dakota has no income tax, relying heavily on sales tax for revenue, which is why taxing online sales was so important to the state.
South Dakota sales tax overview
| Component | 2026 Rate |
|---|---|
| State sales tax | 4.20% |
| Avg local add-on | 1.90% |
| Avg combined | 6.10% |
| Maximum combined | 7.50% |
Note: South Dakota reduced state sales tax from 4.5% to 4.2% in 2023. Sunsets back to 4.5% in 2027 unless extended.
South Dakota sales tax by city
Combined state + local sales tax rates for major cities in South Dakota:
| City | Combined Rate |
|---|---|
| Sioux Falls | 6.20% |
| Rapid City | 6.20% |
What's exempt in South Dakota
Groceries
Taxed at full 4.20% state rate plus any local sales tax.
Clothing & footwear
Taxed at standard rate.
Prescription drugs
Exempt from sales tax (typical across most states).
How South Dakota sales tax is calculated
Sales tax in South Dakota is calculated by multiplying the pre-tax purchase price by the applicable combined rate. The formula is simple:
Sales Tax = Purchase Price × 6.10% (avg combined)
Total = Purchase Price + Sales Tax
The exact rate depends on where the purchase occurs — the state base rate (4.20%) plus any local city or county add-ons. South Dakota allows local jurisdictions to add their own taxes, so the rate varies by location.
Quick calculation examples at average rate 6.10%:
$100 item
$6.10 tax
$106.10 total
$250 item
$15.25 tax
$265.25 total
$500 item
$30.50 tax
$530.50 total
$1,000 item
$61.00 tax
$1061.00 total
Additional tax-free items in South Dakota
Beyond the standard exemptions, South Dakota also provides sales tax relief on these categories:
Exemptions may have conditions. Always verify with the South Dakota Department of Revenue for complete rules.
South Dakota sales tax in context: rates, history, and neighbors
South Dakota's 4.2% state sales tax (temporarily reduced from 4.5% in 2023, sunsetting back to 4.5% in June 2027 unless extended) plus city/local add-ons gives an average combined rate of 6.10%. Sioux Falls 6.2%, Rapid City 6.2%, Aberdeen 6.5%, Pierre 6.2%. SD taxes groceries at the standard rate (one of the few states without a grocery exemption). SD has no state income tax — sales tax is a primary state revenue source. Most famously, South Dakota was the plaintiff in South Dakota v. Wayfair (2018) — the Supreme Court case that established economic nexus for online sales, transforming e-commerce taxation nationally. Compared to neighbors: North Dakota (~7.05%), Minnesota (~8.05%), Iowa (~6.94%), Nebraska (~6.95%), Wyoming (~5.44%), Montana (0%) — SD is one of the lower-rate Plains states.
Online shopping & South Dakota sales tax
South Dakota is the state that created the modern online sales tax landscape. SD v. Wayfair (2018) established that states can require remote sellers to collect sales tax based on economic nexus ($100,000 or 200 transactions) without physical presence. South Dakota's $100,000/200-transaction threshold became the national model adopted by all 45 sales tax states.
Use Tax reminder: If you purchase taxable goods online from a seller who does NOT collect South Dakota sales tax, you technically owe Use Tax — the same rate as sales tax, reportable on your South Dakota state tax return. Use Tax enforcement on consumers is rare but the obligation exists for significant purchases.
How much South Dakota sales tax on common purchases?
Using South Dakota's average combined rate of 6.10%:
| Purchase | Price | Sales Tax | Total |
|---|---|---|---|
| Grocery cart | $150 | $9.15 | $159.15 |
| Clothing / shoes | $120 | $7.32 | $127.32 |
| Prescription drug | $80 | Exempt | $80.00 |
| Smartphone | $999 | $60.94 | $1059.94 |
| Laptop / tablet | $1,299 | $79.24 | $1378.24 |
| New car ($35,000) | $35,000 | $2135.00 | $37135.00 |
| Home appliance | $1,500 | $91.50 | $1591.50 |
| Restaurant meal | $60 | $3.66 | $63.66 |
Based on South Dakota's average combined rate of 6.10%. Exact tax depends on city/county. Use our calculator above for specific locations and amounts.
Collecting sales tax in South Dakota: business guide
If you sell goods or taxable services to South Dakota customers, here's what you need to know:
- Registration: Register for a South Dakota sales tax permit/license through the South Dakota Department of Revenue before making your first taxable sale. Most states process registrations online within a few days.
- Economic nexus (online sellers): If you have $100,000+ in South Dakota annual sales or 200+ transactions, you must collect South Dakota sales tax even without a physical presence in the state — per South Dakota v. Wayfair (2018). You must collect both state (4.20%) and applicable local rates.
- Destination vs origin sourcing: South Dakota uses destination-based sourcing for most sales — the tax rate where the buyer receives the goods applies. Always use the customer's delivery address to determine the rate.
- Filing frequency: Frequency depends on your South Dakota sales volume — monthly for high-volume sellers, quarterly or annually for low-volume sellers. Check with the South Dakota Department of Revenue for your specific filing schedule.
- Marketplace sales: If you sell through Amazon, Etsy, eBay, or similar platforms, the marketplace is required to collect and remit South Dakota sales tax on your behalf — you don't need to collect it separately on marketplace transactions.
- Resale certificates: Businesses purchasing goods for resale can provide a South Dakota resale certificate to suppliers to avoid paying sales tax on wholesale purchases. Keep copies of all resale certificates for audits.
Streamlined Sales Tax (SST): South Dakota is a full member of the Streamlined Sales Tax (SST) Agreement, which simplifies multi-state sales tax registration and compliance through a single registration portal (streamlinedsalestax.org).
South Dakota-specific business compliance details
South Dakota businesses register with the SD Department of Revenue at dor.sd.gov for a Sales Tax License. Filing frequency: monthly for $1,000+/month tax, quarterly for smaller, annually for very small. Out-of-state sellers with $100,000+ in SD sales (or 200+ transactions) must collect SD tax (economic nexus, since November 2018 — SD pioneered this rule that's now national standard). SD is a Streamlined Sales Tax (SST) Agreement member. Marketplace facilitators collect SD tax. SD uses destination-based sourcing. SD's role as the Wayfair plaintiff means its compliance system is well-documented and widely modeled. Penalties: 1% per month (capped at 10%) plus interest. SD's lower base rate (currently 4.2%) makes it relatively business-friendly.
South Dakota sales tax frequently asked questions
Why is South Dakota famous for online sales tax law?
South Dakota v. Wayfair (2018) is the Supreme Court case that transformed e-commerce taxation. South Dakota passed a law requiring online retailers like Wayfair, Overstock, and Newegg to collect SD sales tax if they had $100,000 or more in annual SD sales or 200+ transactions — even without a physical store in SD. The Supreme Court upheld this law 5-4, overturning a 1992 precedent (Quill v. North Dakota) and allowing all states to require internet retailers to collect sales tax.
Does South Dakota tax groceries?
Yes — South Dakota taxes all grocery food at the standard 4.2% rate (2026). This makes SD one of the few states without a grocery exemption. South Dakota has debated eliminating the grocery tax (a major political issue), and Governor Kristi Noem advocated for its removal, but it remains in place as of 2026. The 0.3% temporary rate reduction (4.5% to 4.2%) applies to all purchases including groceries.
What is the sales tax rate in Sioux Falls, South Dakota?
Sioux Falls (Minnehaha County) has a combined rate of 6.2% — 4.2% state + 2% city of Sioux Falls. Rapid City is also 6.2%. These are the two largest cities and the most common shopping destinations in SD. Rural South Dakota often has just the 4.2% state rate with minimal local add-ons. No SD jurisdiction currently exceeds 7.5% combined.