$40K in Idaho Falls = $47,356 in Tempe
Your $40K salary in Idaho Falls (COL 87) has the same purchasing power as $47,356 in Tempe (COL 103). Tempe is more expensive — you'd need 18% more to maintain the same lifestyle.
Budget breakdown — $40K in both cities
What $40K actually buys you in each city after taxes and core expenses.
| Expense | Idaho Falls $40K | Tempe $40K (same salary) |
|---|---|---|
| Monthly take-home | $2,535 | $2,645 |
| 1BR rent | $1,100 | $1,600 |
| Groceries | $365 | $380 |
| Transport | $35 | $55 |
| Utilities | $142 | $210 |
| Internet | $65 | $62 |
| Left after essentials | $828/month | $338/month |
Frequently asked questions
What is $40K in Idaho Falls equivalent to in Tempe?
$40K in Idaho Falls (COL index 87) has the same purchasing power as $47,356 in Tempe (COL index 103). That's 18% more than your current salary.
If I move from Idaho Falls to Tempe keeping my $40K salary, will I be better off?
Not necessarily. Core expenses in Tempe are higher, so on the same $40K salary you'd have $490 less per month. You'd need to earn $47,356 to maintain the same standard of living.
How is the salary equivalent calculated?
The equivalent salary is calculated by multiplying your current salary by the ratio of the two cities' overall cost of living indices: $40K × (103 ÷ 87) = $47,356. This adjusts for differences in housing, food, transport, and general cost of living.
Other salary amounts — Idaho Falls to Tempe
Equivalency uses overall COL index ratio. Take-home uses simplified federal/state brackets. Zillow · BLS · Numbeo · Q1 2026 · For general guidance only