The Sales Tax Rate Went Up. The Expensive Part Is What Got Taxed.

The combined average US sales tax rate rose for the first time in four years to a 10-year high of 10.1881%, according to Vertex's 2026 Mid-Year U.S. Sales Tax Rates and Rules Report ^[1]. That number will get the headlines, and it is the least consequential finding in the report: the same data shows states redefining what is taxable at all, which is a far more expensive problem for anyone selling services or digital products ^[2].

Start with the volume. The first half of 2026 produced 463 combined sales tax rate changes and new rates, against 408 in the first half of 2025 ^[3], an increase of 55, or about 13% ^[4]. The composition matters more than the count. County-level rate changes in six months already exceeded the full-year county total for each of the past five years, and city-level changes rose sharply year over year ^[5]. Rate volatility is migrating downward, into the jurisdictions that are hardest to track and least likely to announce anything through a channel your finance team monitors.

Vertex attributes the pressure to a fiscal squeeze with no clean exit: pandemic response funds are receding, federal support for several programs is being cut, and rainy-day measures are starting to decline, while political pressure to cut income and property taxes removes the alternatives ^[6]. What is left, per the report, is rate increases, base expansion, excise taxes, new fees, and service reductions ^[6].

Base expansion is the line item to watch, because it does not show up in an average. Texas expanded the range of data processing services subject to sales tax ^[7]. Washington broadened its retail sales tax to cover many business, personal, and professional services ^[7]. Nebraska and Maryland have explored broader service tax changes ^[7]. Vertex frames this as tracking the migration of consumer and business spending from goods toward services and digital experiences ^[8]. For a software or services seller, a rate change is a table update. A taxability change means re-deciding whether a product line is taxable in a state where it previously was not, then deciding whether to eat the tax or reprice, then answering customers who notice.

Read the source with its author in mind. Vertex sells indirect tax and compliance software ^[9], and its senior tax officer Chris Hall says businesses "can no longer treat sales tax changes as routine compliance updates" and need "greater visibility, agility and confidence in the systems they rely on" ^[10]. That is a sales argument as much as an observation. It does not make the county-level counts wrong, but note also what is absent: this account gives the new average rate without the prior figure, so the size of the increase is unstated ^[11].

The report also flags a global overlay. Tax administrations are piloting and expanding technology to detect anomalies, errors, and fraud ^[12], and e-invoicing activity has recently spread across Spain, France, Germany, Belgium, Croatia, the UAE, Slovakia, Sri Lanka, Malaysia, and the Dominican Republic, at different speeds and under different requirements ^[13].

Watch whether Nebraska and Maryland convert exploration into enacted service taxes, since two more states would make service taxability a default design question rather than a Washington and Texas exception ^[7]. Watch second-half county activity: the five-year comparison already broke at the halfway mark ^[5]. And treat sales tax holidays and temporary relief as deferred cost, which is how Vertex reads them, arguing they can reduce revenue and increase later pressure to raise rates or widen the base ^[14].