$120K in Idaho Falls = $211,034 in Washington
Your $120K salary in Idaho Falls (COL 87) has the same purchasing power as $211,034 in Washington (COL 153). Washington is more expensive — you'd need 76% more to maintain the same lifestyle.
Budget breakdown — $120K in both cities
What $120K actually buys you in each city after taxes and core expenses.
| Expense | Idaho Falls $120K | Washington $120K (same salary) |
|---|---|---|
| Monthly take-home | $6,575 | $6,575 |
| 1BR rent | $1,100 | $3,100 |
| Groceries | $365 | $422 |
| Transport | $35 | $100 |
| Utilities | $142 | $190 |
| Internet | $65 | $75 |
| Left after essentials | $4,868/month | $2,688/month |
Frequently asked questions
What is $120K in Idaho Falls equivalent to in Washington?
$120K in Idaho Falls (COL index 87) has the same purchasing power as $211,034 in Washington (COL index 153). That's 76% more than your current salary.
If I move from Idaho Falls to Washington keeping my $120K salary, will I be better off?
Not necessarily. Core expenses in Washington are higher, so on the same $120K salary you'd have $2,180 less per month. You'd need to earn $211,034 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: $120K × (153 ÷ 87) = $211,034. This adjusts for differences in housing, food, transport, and general cost of living.
Other salary amounts — Idaho Falls to Washington
Equivalency uses overall COL index ratio. Take-home uses simplified federal/state brackets. Zillow · BLS · Numbeo · Q1 2026 · For general guidance only