Can the same product be taxable in some states and exempt in others?

Yes. US sales tax has no national taxability standard: each state defines what is and isn't taxable independently. A $200 wool sweater is exempt in Pennsylvania (clothing exemption, no price cap) but taxable in Ohio. A downloaded software file is taxable in Texas but not subject to sales tax in California. A protein supplement is taxable in most states but exempt or reduced-rate in a few. State-level taxability mapping is required for accurate compliance.

Which product categories vary most by state?

Clothing, food and groceries, dietary supplements, digital products and SaaS, and prescription vs. OTC medications show the most state-to-state variation. Physical goods like electronics, furniture, and sporting goods are more uniformly taxable across states, though exemptions still exist in specific categories.

Does taxability change by state for the same product?

Yes, and this is one of the most common misconfiguration errors in ecommerce sales tax. Applying a single taxability determination to a product across all states ignores the state-specific rules that govern whether that product is taxable in the destination state.

Categories with the most state-to-state variation

Clothing and apparel

Exempt (no price cap): Pennsylvania, New Jersey, Minnesota, Wisconsin
Exempt under $110/item: New York
Exempt under $175/item: Massachusetts
Exempt under $50/item: Connecticut
Taxable: Most other states, including OH, TX, GA, FL, IL, NC

A $150 fleece jacket: exempt in PA and NJ, exempt in NY and MA, taxable in OH and TX.

Food and groceries

Exempt (state rate): Most states that have a food exemption
Reduced state rate: TN (4%), UT (3%), VA (1%), AR (0.125%)
Taxable (no exemption): AL, OK, groceries taxed at full rate
Candy/soft drinks: taxable in nearly all states, regardless of broader food exemption

Digital products and SaaS

Not taxable: CA, AZ (generally), FL (downloaded software generally exempt)
Taxable: TX, NY, WA, PA (computer services), CT (SaaS), KY (since 2023), IN, WI, MN
Varies by product type: Most states tax downloaded software but not all tax streaming or SaaS

Dietary supplements

Taxable: Most states
Exempt or reduced: CA, IL (1% rate), a few others

Prescription medications

Exempt: Nearly all states
OTC medications: Vary, some states exempt (IL at 1%), others tax at full rate

Why this matters for ecommerce sellers

A multi-state seller shipping the same product nationally needs per-state taxability configuration in their tax engine, not a single “taxable/exempt” toggle. Products with state-variable taxability require:

Correct product tax codes (PTCs) that map to state-level taxability rules
A calculation engine that applies those PTCs per destination state
Regular review as state laws change — Kentucky’s 2023 SaaS expansion is a recent example of a state-level shift that changed taxability without any change to the product itself

Practical example

A seller of protein powder ships nationwide:

Texas: taxable (supplements taxed at full rate)
California: historically exempt (vitamins/supplements exemption)
Illinois: 1% reduced rate (dietary supplements)
New York: taxable
Pennsylvania: taxable

The same product, the same SKU, five different tax treatments. A single product tax code designation without state-level mapping will get at least some of these wrong.