Max $700. "Your total household income must be $36,300 or less." Also,
"You were born before Jan. 1, 1965; OR
You must have been totally and permanently disabled or blind during the entire year, regardless of your age; OR
You must have had a dependent child living with you all of last year who was born before Jan. 1, 2020, and was under the age of 18 the entire year."
Lincoln county sales tax: 8.5%
Sparta, TN: 9.5%
Whoops. I may have been looking at the state tax rates vs. the total sales tax rates.
As for the first question, a hypothesis: KS is about twice the size of TN with about half the population; 14/km^2 vs 65/km^2. But for real numbers, I'm having a hard time finding comparables. And I'm having a hard time figuring out where TN's money comes from.
White county, TN, has a property tax rate of .52% (https://smartasset.com/taxes/tennessee-property-tax-calculat...): $1040/year, and Tennessee doesn't have an income tax.
Property in both is pretty comparable (https://www.realtor.com/realestateandhomes-search/Lincoln-Co..., https://www.realtor.com/realestateandhomes-search/Sparta_TN/...), 1,500 to 2,000 sq ft. Maybe a bit of an edge in Kansas.
Sales tax in Lincoln county are 2 percentage points lower, but it is at least a hundred miles to a bigger city.
Kansas kinda sucks.