Sales Tax for Indian-Owned US Businesses: Do You Need to Register Before March 15?

Picture this: Priya launches her US-based skincare brand from her apartment in Texas. She sells $250,000 through her Shopify store and Amazon. No physical presence anywhere except Texas. She thinks: “I am only registered in Texas, so that is the only state where I owe sales tax, right?”

Wrong. Priya has triggered economic nexus in at least 15 states — and she has been required to collect sales tax in those states for months. Her exposure: $18,000 in uncollected sales tax, plus penalties up to 25% ($4,500), plus interest compounding monthly. Total potential liability: $25,000 or more.

This scenario plays out constantly for Indian entrepreneurs launching US ecommerce businesses. The rules changed fundamentally in 2018 with the South Dakota v. Wayfair Supreme Court decision, which eliminated the physical presence requirement for sales tax. Now, selling remotely into states triggers “economic nexus” — and with it, registration, collection, and filing obligations that most founders do not discover until it is too late.

This guide explains everything Indian-owned ecommerce businesses need to know about US sales tax: economic nexus rules, state-by-state thresholds, marketplace facilitator laws for Amazon and Shopify sellers, multi-state exposure management, and why March 15 matters for your registration timeline.

Quick Answer: Do I owe sales tax in states where I have no physical presence? Yes — since the 2018 South Dakota v. Wayfair Supreme Court ruling, selling into a state above its economic nexus threshold triggers registration and collection obligations even without a physical presence. The most common threshold is $100,000 in annual sales or 200 transactions — though Texas and California use $500,000, and New York requires both $500,000 and 100 transactions. If you sell through Amazon FBA, physical nexus is also created in every state where Amazon stores your inventory.

60-Second Summary Before You Read On

• The 2018 Wayfair decision eliminated the physical presence requirement — you now owe sales tax in states based purely on sales volume, even with zero physical presence
• The most common economic nexus threshold is $100,000 in annual sales or 200 transactions — but Texas and California use $500,000, and thresholds vary significantly by state
• Amazon FBA creates physical nexus in every state where Amazon stores your inventory — typically 8–12 states automatically
• Amazon, Etsy, and Walmart Marketplace are marketplace facilitators that collect and remit sales tax on your behalf — your main Shopify store is not, and you remain 100% responsible for those sales
• In some states, Amazon and Etsy sales count toward your economic nexus threshold even though the marketplace collects the tax — meaning your Shopify sales may be taxable in states you did not expect
• Voluntary Disclosure Agreements (VDAs) can limit back-tax lookback periods to 3–4 years and often waive penalties entirely — far less costly than a state audit
• March 15 is a critical planning date: Q1 sales may have already pushed you over thresholds in new states, and your 2025 business tax return creates an audit trail that states cross-reference against sales tax registrations

What Changed in 2018: The Wayfair Decision

Before June 21, 2018, states could only require businesses to collect sales tax if they had physical presence — an office, warehouse, employees, or inventory — in that state. The Supreme Court’s South Dakota v. Wayfair ruling changed everything. States can now require remote sellers to collect sales tax based solely on economic activity — no physical presence required.

Every state with a sales tax has now enacted economic nexus requirements for remote out-of-state sellers. If you sell enough products into a state — even without any physical presence there — you must register, collect sales tax from customers, and remit it to that state.

Economic Nexus Explained: The $100,000 Threshold

Economic nexus is triggered when your sales into a state exceed certain thresholds based on revenue, transaction count, or both. The most common threshold across 45 states is $100,000 in annual sales or 200 transactions — whichever comes first.

However, this is changing rapidly in 2026. Many states are eliminating the 200-transaction rule, leaving only the revenue threshold.

2026 threshold updates:

Illinois (effective January 1, 2026) eliminated the 200-transaction threshold — now only $100,000 in gross receipts triggers nexus. Other states that have already removed transaction counts include Alaska, Utah, and North Carolina.

What sales count toward the threshold varies by state:

This is one of the most common points of confusion — a state that uses gross sales in its threshold calculation will count more of your revenue toward nexus than one that uses only taxable sales.

State-by-State Economic Nexus Quick Reference

These thresholds are measured over a 12-month period — either the calendar year, prior calendar year, or a rolling 12 months depending on the state.

Real-World Scenarios: When You Trigger Nexus

Scenario 1: Shopify Store Selling Nationwide

Rajesh operates a Shopify store selling phone accessories from Delaware. His 2025 sales by state: California $125,000, Florida $110,000, New York $95,000, Texas $85,000, and $580,000 spread across 30 other states.

• California: Nexus triggered — $125,000 exceeds $100,000 threshold (California uses $500,000 for marketplace facilitators but $100,000 for direct sellers in most interpretations — confirm current rules)
• Florida: Nexus triggered — $110,000 exceeds $100,000
• New York: No nexus yet — needs $500,000 AND 100 transactions; has transactions but not the revenue
• Texas: No nexus yet — needs $500,000, only has $85,000
• Other states: Likely 8–12 states from the $580,000 pool, depending on individual state sales

Action required: Register in Delaware (physical nexus) plus 10–15 states with economic nexus.

Scenario 2: Amazon FBA Seller

Vikram sells kitchen products via Amazon FBA. Amazon stores his inventory in 8 fulfilment centres across the US. 2025 sales: $500,000.

• Physical nexus: All 8 states with Amazon FBA warehouses — Amazon moves inventory automatically, creating nexus Vikram has no control over
• Economic nexus: Any additional states where sales exceed thresholds

Good news: Amazon as a marketplace facilitator collects and remits sales tax on his behalf in all 45 states with marketplace facilitator laws. Action required: Potentially register in states with FBA inventory (varies by state rules), but Amazon handles collection for those sales.

Scenario 3: Multi-Channel Seller — The Danger Zone

Anita sells handmade jewellery through Amazon ($300,000), her own Shopify store ($200,000), and Etsy ($100,000).

• Amazon sales: Amazon collects and remits — Anita has zero collection responsibility
• Etsy sales: Etsy collects and remits — Anita has zero collection responsibility
• Shopify sales: Anita is 100% responsible for collection, filing, and remittance

The critical problem: In states like California and Massachusetts, Amazon and Etsy sales count toward the economic nexus threshold even though those platforms collect the tax. The combined $600,000 in sales may push Anita over the threshold in states where her $200,000 in Shopify sales would not have done so on their own. She must register and collect on Shopify sales in those states even though she never collects a dollar from Amazon or Etsy sales there.

Marketplace Facilitator Laws: What Amazon, Shopify, and Etsy Actually Handle

Marketplace facilitator laws shifted sales tax collection responsibility from third-party sellers to the platforms themselves. All 45 states with a sales tax now have marketplace facilitator laws in effect.

Who IS a Marketplace Facilitator

These platforms calculate, collect, file, and remit sales tax on your behalf:

• Amazon (including FBA)
• Walmart Marketplace
• eBay
• Etsy
• Shopify Shop App (the mobile shopping app — separate from your main Shopify store, as of January 2025)
• Target Plus
• Wayfair
• Wish

Who is NOT a Marketplace Facilitator

These platforms provide ecommerce tools but leave you 100% responsible for sales tax:

• Shopify (your main storefront)
• WooCommerce
• BigCommerce
• Wix
• Squarespace
• Magento

The distinction matters enormously: Shopify calculates the correct tax rate at checkout, but you are the one collecting it from the customer and responsible for filing and remitting it to every state. Shopify is a software tool, not a marketplace facilitator.

Important exception: Shopify’s Shop App — the mobile shopping application, not your main Shopify storefront — became a marketplace facilitator as of January 2025. Sales made through the Shop App have sales tax collected automatically by Shopify. Sales through your main Shopify store remain your responsibility.

What Marketplace Facilitators Do on Your Behalf

When you sell through a marketplace facilitator, the platform calculates sales tax at checkout at the correct state and local rate, collects it from the customer, files sales tax returns in all states, remits payments to state governments, and handles audits if states question the tax collected. You receive sales reports showing tax collected on your behalf — you do not collect, file, or remit anything for those sales.

Multi-Channel Seller Complexity: The Two Hidden Problems

Problem 1: Do Marketplace Sales Count Toward Economic Nexus?

The answer varies by state — and getting it wrong is expensive.

Example consequence: Anita has $90,000 in Amazon sales and $15,000 in Shopify sales in California. California counts both toward the $100,000 threshold. Combined: $105,000 — nexus triggered. Anita must register in California and collect tax on her $15,000 in Shopify sales, even though Amazon collected and remitted on the other $90,000. In Illinois, only the $15,000 in Shopify sales count — no nexus yet.

Problem 2: Must You Register Even If the Marketplace Collects Everything?

In many states, yes. Even if Amazon collects 100% of your sales tax, states still require a sales tax registration or permit, periodic return filings (showing $0 tax owed because the marketplace collected), or registration under a non-collecting seller status. This requirement varies significantly by state — another reason specialist guidance is valuable for multi-channel sellers.

Common Ecommerce Business Models and Sales Tax Responsibilities

Multi-State Registration: When and How

When to Register in a State

Register immediately when you exceed the economic nexus threshold in a state, establish physical presence through inventory, an office, or an employee, or attend trade shows or events in a state (which can create temporary physical nexus).

Most states require collection starting the first day of the month after you cross the threshold, or immediately upon crossing — the rules vary. Example: you cross $100,000 in Florida on February 15, 2026. You must register by March 1 and begin collecting Florida sales tax on March 1.

How to Register

The general process: visit the state’s Department of Revenue website, complete the sales tax registration application, provide your EIN, business address, ownership information, and start date, pay any registration fee ($0–$100 depending on the state), receive your sales tax permit or licence, and begin collecting tax immediately. Processing time ranges from 1–6 weeks depending on the state.

States that may require upfront bonds or deposits for remote sellers: Alabama, Connecticut, and Nevada. Bond amounts typically range from $1,000–$50,000 based on estimated tax liability.

Filing Frequencies and Deadlines

States assign filing frequency based on your tax volume:

You must file even if you have $0 in sales for the period — most states require zero returns to confirm continued compliance.

Why March 15 Matters for Your Sales Tax Registration

March 15 is not just the S-Corp and partnership tax return deadline — it is a critical planning date for ecommerce sellers for four distinct reasons.

Q1 sales may have already triggered new nexus. If your January–March 2026 sales pushed you over thresholds in new states, you need to register by April 1 to begin collecting from April 1. Example: you hit $100,000 in Florida on March 10. You must register by April 1 and begin collecting that day.

Your 2025 tax return creates an audit trail. When you file your 2025 business returns showing $500,000 in revenue, you are creating a document that states can and do cross-reference against sales tax registrations. Filing a federal return showing significant revenue while unregistered for sales tax in states you sold into is one of the most common ways state audits begin.

States cross-check with payment processors. States receive transaction-level data from payment processors including Shopify Payments and Stripe. If that data shows sales into a state but no corresponding sales tax registration, it generates an automated nexus notice.

March 15 is your strategic planning window. It gives you time to analyse 2025 sales by state, determine which states you triggered nexus in, register before Q2 begins, implement proper tax collection going forward, and address prior-year exposure through a VDA before a state contacts you.

Penalties for Non-Compliance

Example calculation: Uncollected sales tax of $20,000 + late penalty of 20% ($4,000) + two years of interest at 12% ($4,800) = total owed: $28,800 — on $20,000 of underlying tax.

In extreme cases of wilful failure to collect and remit, states can pursue personal liability for owners, misdemeanour charges, fines up to $25,000, and in rare cases imprisonment.

Voluntary Disclosure Agreements: The Smart Way to Fix Prior Non-Compliance

If you discover you should have been registered in a state but were not, do not simply register going forward. States can assess back taxes for all prior years where you had nexus. The better path is a Voluntary Disclosure Agreement (VDA).

VDA benefits:

• Limited lookback period — typically 3–4 years versus the standard 6–10 year audit window
• Penalty waivers — often 100% of penalties are waived
• Interest reduction in some states
• Anonymous application process — you can apply without revealing your business identity until the state approves terms
• No criminal prosecution

VDA process: Submit an anonymous application to the state, the state reviews and proposes terms, you reveal your business identity once terms are accepted, register for sales tax, pay back taxes for the limited lookback period, and begin forward compliance. The cost is a fraction of full audit exposure — and it is only available if you come forward proactively before the state contacts you. The team at MyTaxFiler has negotiated VDAs across multiple states for Indian-owned ecommerce businesses and can manage the entire process.

Sales Tax Automation Solutions

Manual sales tax compliance across 20 or more states is not feasible for most businesses. These platforms automate calculation, collection, and filing:

These platforms integrate with Shopify, Amazon, WooCommerce, and other channels, monitor your economic nexus status in real time, calculate the correct rate at checkout, and file returns automatically in states where you are registered. The cost of automation is almost always less than the penalty exposure from one missed filing in a high-sales state.

Action Plan: What Indian Entrepreneurs Must Do Now

Step 1 — Analyse 2025 sales by state (by March 15): Pull sales reports from every channel — Shopify, Amazon Seller Central, Etsy, direct. Organise by customer state. Calculate total sales per state. Compare against each state’s economic nexus threshold. Identify every state where you exceeded the threshold.

Step 2 — Register in nexus states (March–April): Prioritise states with the highest sales first. Complete registration applications through each state’s Department of Revenue. Set up tax collection in your shopping carts and configure your automation tools.

Step 3 — Implement collection systems immediately: Enable tax collection in Shopify or WooCommerce. Verify Amazon is collecting if you are an FBA seller. Set up TaxJar, Avalara, or a comparable platform. Test checkout to confirm tax calculates at the correct rate.

Step 4 — Set up your filing calendar (by April 1): Note the filing frequency assigned by each state. Mark all quarterly and monthly deadlines. Set reminders one week before each due date. Consider an AutoFile service through TaxJar or Avalara to eliminate manual filing entirely.

Step 5 — Evaluate voluntary disclosure if needed: If you had nexus in 2024 or 2025 but did not collect tax, do not simply register going forward. Consult a specialist, file VDA applications for affected states, and pay back taxes with penalty waivers before a state identifies you first.

Key Takeaways

• The Wayfair decision eliminated the physical presence requirement — economic nexus now triggers sales tax obligations based purely on sales volume in a state
• The most common threshold is $100,000 in annual sales or 200 transactions — but Texas and California use $500,000, New York requires both $500,000 and 100 transactions, and several states are eliminating transaction counts entirely in 2026
• Amazon FBA creates physical nexus in every state where Amazon stores your inventory — typically 8–12 states you never chose
• Amazon, Etsy, and Walmart Marketplace are marketplace facilitators that handle collection and remittance — your main Shopify store is not, and those sales are entirely your responsibility
• In some states, marketplace sales count toward your economic nexus threshold even though the platform collects the tax — this is the most common source of unexpected multi-state exposure for Indian ecommerce founders
• If you have prior years of non-compliance, a Voluntary Disclosure Agreement limits your lookback period and typically waives penalties — it must be initiated before the state contacts you
• March 15 is the right time to analyse 2025 sales by state, determine nexus exposure, and register before Q2 begins and new periods of uncollected tax accumulate

Frequently Asked Questions

I only have a Shopify store and no warehouse. Do I really owe sales tax in other states?

Yes — since the Wayfair ruling, physical presence is no longer required. If your Shopify sales into a state exceed that state’s economic nexus threshold — $100,000 in most states, $500,000 in Texas and California — you are required to register, collect, and remit sales tax in that state regardless of where you or your inventory are located.

Amazon collects sales tax on my FBA sales. Do I still need to register anywhere?

Possibly yes, for two reasons. First, Amazon FBA stores your inventory in fulfilment centres across multiple states, creating physical nexus in those states — some states require you to register even though Amazon collects the tax. Second, if your state counts Amazon marketplace sales toward your economic nexus threshold (California and Massachusetts do), those sales may push you over the threshold in states where your direct sales alone would not.

What is the difference between my Shopify store and the Shopify Shop App for sales tax purposes?

Your main Shopify storefront is not a marketplace facilitator — you collect, file, and remit sales tax for all sales through it. The Shopify Shop App (the mobile shopping application, separate from your store) became a marketplace facilitator as of January 2025 — Shopify collects and remits sales tax on Shop App sales automatically. If you do not know whether your customers are buying through your main store or the Shop App, check your Shopify analytics — the distinction has significant compliance implications.

I missed registering in several states last year. What happens if I just start registering now?

States can assess back taxes for all prior periods where you had nexus but were not registered — potentially 6–10 years in some states. Simply registering now without addressing prior exposure does not eliminate that liability. A Voluntary Disclosure Agreement is almost always the better path — it limits the lookback period to 3–4 years and typically waives penalties entirely. The VDA must be initiated before the state contacts you. Once you receive a nexus notice or audit letter, the VDA option may no longer be available.

How do I know what sales tax rate to charge in each state?

Sales tax rates vary by state, county, city, and special tax district — and in some locations, the combined rate exceeds 10%. Charging the wrong rate creates liability. This is exactly why sales tax automation platforms like TaxJar and Avalara exist — they maintain a constantly updated database of rates at the address level and apply the correct rate at checkout automatically. Do not attempt to maintain a manual rate table across 20 or more states.

Does my Indian business structure affect US sales tax obligations?

No — sales tax obligations are based on economic activity in US states, not on the ownership structure or nationality of the business owner. An Indian founder operating a US LLC or S-Corp has identical sales tax obligations to a US-born founder with the same business. However, if you are operating as a foreign entity selling into the US without a US entity, the sales tax analysis becomes more complex and requires specialist advice.

What is the Streamlined Sales Tax (SST) programme and should I use it?

The Streamlined Sales Tax programme is a multi-state initiative that simplifies registration across member states. By registering through the SST Streamlined Sales Tax Registration System (SSTRS), you can register in multiple member states simultaneously through a single application at no cost. As of 2026, 24 states participate. If you are registering in multiple states at once, SST registration is worth evaluating for the member states — you still register separately in non-member states like California and Texas.

At MyTaxFiler, we specialize in cross-border tax for Indians in the US — from FBAR and FATCA to property in India, equity in your home-country startup, and everything in between. We’re not a software tool. We’re a team of CPAs and tax specialists who’ve seen your exact situation before. Talk to us at MyTaxFiler.com