McKinney and Allen have a similar cost of living.
When comparing McKinney, TX and Allen, TX, the overall cost of living indices are 138 and 137 respectively (national median = 100). Rent is comparable in both cities, with less than $50/month separating them.
Median household income is $8,857/year higher in Allen. Home values also differ significantly — the median in McKinney is $439,500 compared to $429,900 in Allen.
Both cities share the same state tax structure since they are in Texas.
McKinney vs Allen — common questions
Other cost of living comparisons for McKinney and Allen