State Tax Competitiveness Index Ranks Structural Design Over Revenue
When state lawmakers talk about tax reform, the conversation usually revolves around how much money is flowing into the treasury or whether the budget balances cleanly. But according to the Tax Foundation, looking strictly at total tax collections misses the point entirely. Published annually since 2003 and recently renamed from the State Business Tax Climate Index, the State Tax Competitiveness Index evaluates something far more foundational: how well states actually structure their tax systems.
The index digs into more than 150 variables across five major categories—individual income taxes, corporate taxes, sales and excise taxes, property and wealth taxes, and unemployment insurance taxes. Instead of rewarding a state simply for collecting less or more cash, it measures whether a tax code is simple, neutral toward business decisions, and built on a broad tax base paired with low rates. In our modern economy, a state’s stiffest competition isn’t coming from overseas; it is coming right across the state line.
How Component Weights Shape the National Rankings
Not all taxes weigh equally in the final tally. The index assigns specific weights based on how much variation exists between states in each category, meaning the areas where state approaches diverge most heavily influence the overall standings. Individual income taxes carry the heaviest weight at 31.8 percent, reflecting the vast gulf between states with no income tax and those imposing double-digit top marginal rates with a dozen brackets. Sales and excise taxes follow closely at 21.2 percent, and corporate taxes sit right alongside them at 21.1 percent.
Property and wealth taxes account for 14.5 percent of the score, while unemployment insurance taxes make up the remaining 11.4 percent. Every category is split into two equally weighted sub-indices measuring rates and bases separately. A low tax rate cannot rescue a poorly designed tax base, and a narrow base cannot be fixed by a simple rate cut.
States that tax tangible personal property like machinery and business inventory lose points because those levies directly penalize expansion. Meanwhile, gross receipts taxes draw heavy penalties for causing tax pyramiding, where the same product gets taxed repeatedly at every single stage of production. That pushes the effective tax rate well above the statutory rate and hits low-margin businesses hardest.
Shifting Standings and the Cost of Narrowing Tax Bases
The 2027 rankings illustrate how policy choices ripple through the index. Utah climbed five places to break into the top 10 at 10th overall, fueled by pro-growth tax code choices. Utah trimmed its individual and corporate income tax rates down to 4.45 percent and conformed to federal expensing provisions that some of its neighbors decided to skip.
On the flip side, states that conformed to temporary federal deductions for tips and overtime pay often paid a steep price in their overall standings. Idaho dropped four spots to 13th overall, sliding eight places on the individual income tax component alone.
Indiana experienced a similar slide, falling three spots to 14th overall. Even with a flat 2.95 percent state individual income tax rate, Indiana authorizes local county income taxes that nearly double the combined rate in certain jurisdictions. Combined with deductions for tips and overtime, its individual income tax ranking fell from 21st to 28th.
Further west, Montana fell two spots from 5th to 7th overall. While Montana lowered its top income tax rate to 5.65 percent, its individual income tax ranking dropped because federal provisions making tips, overtime, and auto loans tax-free narrowed its tax base. Five other states—Georgia, Kentucky, Nebraska, North Carolina, and Oklahoma—climbed ahead by reducing their flat and top marginal income tax rates instead.
Missouri broke into the top 10 by climbing three places to 9th overall. Unlike states that narrowed their bases, Missouri resisted carving out exemptions for tipped and overtime pay. Oklahoma also climbed four places to 15th overall after moving from six individual income tax brackets to three and lowering its top rate to 4.5 percent.
States must continuously adapt their tax architecture as national policies shift. When competing jurisdictions choose different paths for expensing and deductions, the relative scores move even if a state’s own laws remain untouched.
