Consultants outline fiscal tradeoffs: residential annexation yields slower gains, commercial corridors drive short‑term revenue

Consultant Sarah Emmons presented the fiscal model that underpins Mill Creek’s annexation scenarios, explaining revenues (property tax, sales tax, REET, remote taxable sales) and expenditure drivers (police, surface water, staff). Emmons emphasized the model relies on county land‑use assumptions, assessor data and the Department of Revenue split‑out of taxable sales across subareas.

Sarah explained the model’s key assumptions: a 2027 base year for the first fiscal estimate, a 3.5% annual market turnover assumption, and a six‑year annexation tax credit that phases out (noted to expire around 2032 in the model). On specific scenarios, Rob Fenty and Sarah reported A+B (primarily residential) shows a Year‑1 net to the city of about $1.1 million that declines over time, while combinations that include D and H show materially higher near‑term net gains because of sales tax and industrial taxable activity. Sarah cautioned, “these again are estimates” and that staffing FTEs were apportioned using Mill Creek’s existing service ratios and will be refined during implementation planning.

Council members questioned several line items — notably a projected $950,000 surface‑water first‑year cost in Area A and a $1.6M police increase — and staff said those figures came from applying the city’s current per‑thousand‑residents ratios and existing operating benchmarks. Staff and consultants agreed to dig deeper block‑by‑block as the council directs a CDH‑focused next step.