$120K in Boston = $64,444 in Idaho Falls
Your $120K salary in Boston (COL 162) has the same purchasing power as $64,444 in Idaho Falls (COL 87). Idaho Falls is cheaper — your money goes 46% further there.
Budget breakdown — $120K in both cities
What $120K actually buys you in each city after taxes and core expenses.
| Expense | Boston $120K | Idaho Falls $120K (same salary) |
|---|---|---|
| Monthly take-home | $6,655 | $6,575 |
| 1BR rent | $3,000 | $1,100 |
| Groceries | $418 | $365 |
| Transport | $90 | $35 |
| Utilities | $185 | $142 |
| Internet | $70 | $65 |
| Left after essentials | $2,892/month | $4,868/month |
Frequently asked questions
What is $120K in Boston equivalent to in Idaho Falls?
$120K in Boston (COL index 162) has the same purchasing power as $64,444 in Idaho Falls (COL index 87). That's 46% less than your current salary.
If I move from Boston to Idaho Falls keeping my $120K salary, will I be better off?
Yes. If you keep earning $120K after moving to Idaho Falls, you'd have $1,976 more per month after core expenses — because Idaho Falls is cheaper than Boston.
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 × (87 ÷ 162) = $64,444. This adjusts for differences in housing, food, transport, and general cost of living.
Other salary amounts — Boston 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