$100K in Springfield = $107,407 in Idaho Falls
Your $100K salary in Springfield (COL 81) has the same purchasing power as $107,407 in Idaho Falls (COL 87). Idaho Falls is more expensive — you'd need 7% more to maintain the same lifestyle.
Budget breakdown — $100K in both cities
What $100K actually buys you in each city after taxes and core expenses.
| Expense | Springfield $100K | Idaho Falls $100K (same salary) |
|---|---|---|
| Monthly take-home | $5,904 | $5,838 |
| 1BR rent | $1,000 | $1,100 |
| Groceries | $357 | $365 |
| Transport | $48 | $35 |
| Utilities | $155 | $142 |
| Internet | $58 | $65 |
| Left after essentials | $4,286/month | $4,131/month |
Frequently asked questions
What is $100K in Springfield equivalent to in Idaho Falls?
$100K in Springfield (COL index 81) has the same purchasing power as $107,407 in Idaho Falls (COL index 87). That's 7% more than your current salary.
If I move from Springfield to Idaho Falls keeping my $100K salary, will I be better off?
Not necessarily. Core expenses in Idaho Falls are higher, so on the same $100K salary you'd have $155 less per month. You'd need to earn $107,407 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: $100K × (87 ÷ 81) = $107,407. This adjusts for differences in housing, food, transport, and general cost of living.
Other salary amounts — Springfield to Idaho Falls
Equivalency uses overall COL index ratio. Take-home uses simplified federal/state brackets. Zillow · BLS · Numbeo · Q1 2026 · For general guidance only