Ecommerce and Online Sellers in New York City

For a New York City ecommerce seller, sales tax collection outside New York turns on economic nexus, the rule the Supreme Court upheld in South Dakota v. Wayfair in 2018. Before that decision a state could only require you to collect its sales tax if you had physical presence there, an office, an employee, or inventory sitting in a warehouse. After Wayfair a state can require collection based purely on how much you sell into it, with no physical footprint at all. That is why a seller working out of Manhattan or Brooklyn can suddenly owe collection duties in a dozen states, and it is the first thing we check for a new online seller.

Most states adopted a threshold modeled on the one the Court approved, $100,000 of sales into the state or 200 separate transactions, measured over the current or prior year. New York itself sits higher for inbound sellers, requiring more than $500,000 of sales and more than 100 transactions before an out-of-state seller must register here, and both conditions have to be met. The specifics vary from state to state in ways that matter, because some use only the dollar figure, several have dropped the transaction count, and the categories of sales that count toward the threshold differ. There is no single national rule, which is exactly why this is hard to self-manage as a store grows into new markets.

Marketplace facilitator laws are the piece that keeps this manageable. Nearly every state now requires the marketplace itself, Amazon, Etsy, Walmart, eBay, to collect and remit the tax on the sales it processes, so your Amazon and Etsy orders are largely handled by the platform, and in many states those facilitated sales still count toward your own economic nexus threshold. The exposure lives in the sales the marketplaces do not cover, chiefly your own Shopify store or anything you sell direct where you are the merchant of record.

Here is how it plays out. Say your Shopify store ships $130,000 of product into Pennsylvania this year across 900 orders. You have blown past the $100,000 economic nexus threshold, so you are required to register with Pennsylvania, collect its sales tax on taxable orders shipped there, and file returns. If you do not notice until eighteen months later, you owe the uncollected tax out of your own pocket plus penalties and interest, because the duty existed whether or not you charged customers. On a $130,000 base at roughly 6 percent that is close to $8,000 of tax you may have to eat, before penalties. Meanwhile on your home turf you are already collecting New York sales tax at about 8.875 percent on taxable sales delivered inside New York City, so a single busy year can leave you registered in a new state while already remitting in your own.

The practical trouble is that these thresholds are moving targets. A state you sold $60,000 into last year is not a problem, but the same store growing to $110,000 into that state this year crosses the line mid-year, and the duty to collect starts from the crossing date rather than the following January. That is why we watch the running totals rather than checking once at tax time. We track your sales by state through tax compliance and register you the moment a state actually requires it, so you are collecting from customers rather than paying the tax yourself out of margin after the fact. The New York rules are on the New York State Department of Taxation and Finance site, and the decision itself is in the Wayfair opinion.

The New York City Unincorporated Business Tax, or UBT, is a city-level tax on the income of unincorporated businesses operating in New York City, and for an ecommerce seller running as a sole proprietor or partnership it is one of the biggest and least expected costs of a city base. It applies at 4 percent of business income above a modest exemption, and it sits entirely on top of the New York State income tax and the New York City personal income tax you already pay as a resident. Many sellers have never heard of it until the first return, because it does not exist in most other places a store might be based.

The trigger is how you are organized, not what you sell. If you run your store as a sole proprietor filing a Schedule C, or as a partnership, and you are carrying on business in the city, you are within the UBT. A single-member LLC that has not elected corporate treatment is taxed as a sole proprietor and falls in the same place. The tax reaches the net income of that unincorporated business, so as your store profit grows the 4 percent grows with it. There is a modest exemption and a credit mechanism that softens the hit at lower income levels, but a profitable seller feels the full 4 percent on the income above those floors. Worth knowing too is that the UBT is measured on business income allocated to the city, so a seller who genuinely conducts part of the operation outside New York City may allocate a portion of income away from the tax, though that allocation has to be real and documented rather than a paper claim.

Here is a worked example. Suppose your online store nets $150,000 and you run it as a single-member LLC on Schedule C. On top of federal income tax, federal self-employment tax of roughly 15.3 percent, New York State income tax that climbs into the high single digits, and the New York City resident income tax near 3.876 percent, the UBT adds roughly 4 percent of the business income above the exemption. On $150,000 of net income that UBT layer alone can run in the neighborhood of $5,000 to $6,000 a year after the exemption and credit, a cost that a seller in Miami or Austin simply does not carry. For most home-based online sellers who run the whole operation from a city apartment, the full net income is city income and the 4 percent applies to all of it above the exemption, with no meaningful allocation available.

The planning response is usually structural. A New York S corporation is not subject to the UBT, though it is subject to the separate New York City general corporation tax, so the switch is not automatic and the two regimes have to be compared on your actual numbers. For many growing sellers the S corporation also cuts federal self-employment tax by splitting income into a reasonable salary and distributions, so the UBT saving and the self-employment saving can point the same direction at once. We run that comparison and, when it makes sense, build the structure through entity formation and structuring, then keep the resulting returns coordinated so the city, state, and federal pieces line up. The city sets out the rules on the NYC Department of Finance UBT page, and the broader small business framework is in IRS Publication 334.

For a New York City ecommerce seller, inventory and cost of goods sold are the heart of the tax picture, and getting them wrong is expensive here because every dollar of overstated profit is taxed at one of the highest combined state and local rates in the country. The core rule is that buying inventory is not a deductible expense. When you spend $40,000 restocking product, you have not lost $40,000, you have converted cash into an asset that sits in a warehouse. That purchase only becomes a deduction, as cost of goods sold, when the specific units actually sell. Until then it stays on your balance sheet as inventory, and no amount of cash leaving your account changes that.

Sellers who ignore this and expense every purchase when the money leaves their account produce financial statements that are fiction. In a heavy buying quarter they show a loss they did not really have, then in the next period they show inflated profit because the sold goods carry no recorded cost. The tax consequence is a rollercoaster, a low bill in a stocking year followed by a brutal one later, all because the timing of deductions was tied to cash instead of to sales. In New York City that swing is amplified, because the profit runs through the state graduated rate to 10.9 percent, the city resident tax near 3.876 percent, and possibly the 4 percent UBT, so a misstated number moves your combined tax by a large multiple of what it would in a no-tax state.

The mechanics run through a simple formula. Beginning inventory, plus purchases during the year, minus ending inventory, equals cost of goods sold. That means you need an accurate count and value of what is left on the shelf at year end, because ending inventory directly reduces your deduction. If you carry $60,000 of unsold product on December 31, that $60,000 is not deductible this year no matter how much cash you spent. Your valuation method matters too, because first-in first-out and a weighted average produce different COGS and different ending values when supplier prices move, which is why we choose the method deliberately rather than by accident.

Here is the worked example. You start the year with $50,000 of inventory, buy $200,000 more, and finish with $60,000 on hand. Cost of goods sold is $50,000 plus $200,000 minus $60,000, which is $190,000. On $400,000 of sales your gross profit is $210,000 before operating expenses, a clean and defensible figure. The seller who deducted the full $200,000 and ignored the $60,000 still in the warehouse overstated the deduction by $60,000, and in New York City the combined state, city, and UBT cost of that error can approach $10,000. Landed cost adds a layer for importers, because customs duties, freight, and inbound shipping belong in inventory value, not a separate expense bucket. We build the whole COGS schedule as part of your monthly financial reporting so the number is right all year, not reconstructed in April. The federal standards for inventory and accounting methods are in IRS Publication 538 and Publication 334.

The Form 1099-K is the information return that payment processors and online marketplaces file with the IRS to report the gross payments they ran through for you, and for a New York City ecommerce seller it is a frequent source of panic and mismatched returns. For 2026 the reporting threshold reverted to its long-standing level, so a platform must issue you a 1099-K once you exceed $20,000 in gross payments and more than 200 transactions in the year. Earlier plans to drop the threshold to a much lower figure were reversed, so many smaller sellers will not receive the form at all, though that changes nothing about the duty to report income you actually earned.

That last point matters, so it bears stating plainly. The 1099-K threshold governs whether a form gets mailed, not whether the income is taxable. Every dollar your store earns is reportable whether or not a 1099-K arrives. If you do $18,000 in sales and receive no form, that $18,000 still belongs on your return, and it still flows through the full New York State and New York City income tax as well as the federal return. Treating the threshold as a floor below which income is tax-free is how sellers end up with underreported income and an unpleasant letter a year or two later.

The reconciliation problem is the bigger one. A 1099-K reports gross payments, the total buyers paid before anything was netted out. That gross includes the marketplace referral fees the platform kept, payment processing fees, sales tax that was collected, and shipping charges you collected and paid to carriers, and it is stated before any refunds you issued. If you report only what landed in your bank account, your revenue will be far below the gross the IRS was handed, and that gap is a classic audit flag. The fix is not to report the inflated gross either, because you never kept it. The fix is to report true gross revenue and separately deduct every fee, refund, and pass-through so the return reconciles cleanly to both the 1099-K and your bank statements.

Here is the math on a real case. Your Amazon 1099-K shows $250,000 of gross payments. Of that, $45,000 was Amazon referral and fulfillment fees, $15,000 was refunds to customers, and $12,000 was sales tax Amazon collected and remitted for you. Your true product revenue is around $223,000 after backing out the sales tax that was never yours, and the $45,000 of fees and $15,000 of refunds are legitimate reductions a careless return would miss. Reported correctly, you are taxed on real profit rather than the $250,000 headline, and in New York City the difference on that gap runs into five figures once state, city, and federal tax are stacked.

We perform this reconciliation on every ecommerce return and tie it to the bookkeeping so the numbers already agree before filing, which also means that if the IRS or the state questions the gap, the answer is documented line by line rather than rebuilt under pressure. It also protects the New York side specifically, because the state starts from your federal figures, so a clean federal reconciliation carries straight through to the New York return and the city return without a second round of untangling. The IRS walks through the form on its Understanding Your Form 1099-K page, and the underlying income rules are in Publication 334.

For a New York City ecommerce seller, electing S-corporation status is often the single biggest tax move available, because it can cut federal self-employment tax and drop the New York City Unincorporated Business Tax at the same time. Most sellers start as a sole proprietor reporting on Schedule C, or a single-member LLC taxed the same way. In that setup the entire net profit of the store is subject to 15.3 percent self-employment tax on top of income tax, and because a sole proprietor is an unincorporated business in the city, that same profit is also exposed to the 4 percent UBT. Two separate taxes are riding on the full profit at once.

Electing S-corporation status changes both. As an S corporation you pay yourself a reasonable salary that carries payroll tax, and the remaining profit passes through as a distribution that avoids self-employment and payroll tax. A New York S corporation is also outside the UBT, though it becomes subject to the separate New York City general corporation tax, so the city piece is a swap rather than a clean elimination and has to be modeled. The tradeoff is added cost and formality, because you have to run real payroll, file a separate 1120-S return, and defend the salary as reasonable. Below roughly $50,000 of profit the savings rarely cover that overhead, and above about $80,000 they often do, especially once the UBT is in the picture.

Here is a worked example. Suppose your store nets $120,000 and a reasonable salary for the work you do is $70,000. As a sole proprietor, close to the full $120,000 faces self-employment tax, roughly $16,000 after the base adjustment, and the profit above the exemption also draws the 4 percent UBT, perhaps $5,000 more. As an S corporation, only the $70,000 salary carries payroll tax, about $10,700, the $50,000 distribution escapes it, and the UBT falls away in favor of the general corporation tax that is often smaller on these numbers. The combined federal and city saving can run several thousand dollars a year, for a structure we set up once through entity formation and structuring. Many sellers also claim the 20 percent qualified business income deduction under Section 199A on the federal side, which sweetens the case further.

Timing and coordination are where a New York seller has to be careful. The S election generally has to be in place near the start of the tax year to apply for that year, the reasonable salary has to be genuine and documented rather than a token figure, and the New York State and New York City treatment of the S corporation has to be elected and filed correctly so the state actually recognizes the status. Get any of that wrong and you can end up paying both regimes or losing the intended saving. We run the breakeven on your real numbers, handle the federal and New York elections, and then keep the payroll, the 1120-S, and the state and city returns coordinated so the whole structure holds together. The S-corporation rules are on the IRS S corporations page, and the reasonable-compensation standard is covered in the IRS Small Business Tax Center.