$40K in Durham = $34,118 in Idaho Falls
Your $40K salary in Durham (COL 102) has the same purchasing power as $34,118 in Idaho Falls (COL 87). Idaho Falls is cheaper — your money goes 15% further there.
Budget breakdown — $40K in both cities
What $40K actually buys you in each city after taxes and core expenses.
| Expense | Durham $40K | Idaho Falls $40K (same salary) |
|---|---|---|
| Monthly take-home | $2,578 | $2,535 |
| 1BR rent | $1,750 | $1,100 |
| Groceries | $372 | $365 |
| Transport | $82 | $35 |
| Utilities | $155 | $142 |
| Internet | $62 | $65 |
| Left after essentials | $157/month | $828/month |
Frequently asked questions
What is $40K in Durham equivalent to in Idaho Falls?
$40K in Durham (COL index 102) has the same purchasing power as $34,118 in Idaho Falls (COL index 87). That's 15% less than your current salary.
If I move from Durham to Idaho Falls keeping my $40K salary, will I be better off?
Yes. If you keep earning $40K after moving to Idaho Falls, you'd have $671 more per month after core expenses — because Idaho Falls is cheaper than Durham.
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 × (87 ÷ 102) = $34,118. This adjusts for differences in housing, food, transport, and general cost of living.
Other salary amounts — Durham 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