11:36 2019-06-18 Update

https://tax.utah.gov/sales/rates

For Millcreek per City Code 18-094, it is:   7.25%
see 
pdf:  2019-07-01 Sales Tax Simple page 4
or

pdf:  2019-07-01 Sales Tax Complex P4

AND refer to Publication 25 ANNOTATED.  Page 5 for rules.

FSS is ONLY based in Millcreek.  Therefore collects only Millcreek sales tax.