$120K in Boise = $114,286 in Naperville
Your $120K salary in Boise (COL 105) has the same purchasing power as $114,286 in Naperville (COL 100). Naperville is cheaper — your money goes 5% further there.
Budget breakdown — $120K in both cities
What $120K actually buys you in each city after taxes and core expenses.
| Expense | Boise $120K | Naperville $120K (same salary) |
|---|---|---|
| Monthly take-home | $6,575 | $6,655 |
| 1BR rent | $1,600 | $1,650 |
| Groceries | $372 | $380 |
| Transport | $45 | $72 |
| Utilities | $145 | $158 |
| Internet | $60 | $62 |
| Left after essentials | $4,353/month | $4,333/month |
Frequently asked questions
What is $120K in Boise equivalent to in Naperville?
$120K in Boise (COL index 105) has the same purchasing power as $114,286 in Naperville (COL index 100). That's 5% less than your current salary.
If I move from Boise to Naperville keeping my $120K salary, will I be better off?
Yes. If you keep earning $120K after moving to Naperville, you'd have $-20 more per month after core expenses — because Naperville is cheaper than Boise.
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 × (100 ÷ 105) = $114,286. This adjusts for differences in housing, food, transport, and general cost of living.
Other salary amounts — Boise to Naperville
Equivalency uses overall COL index ratio. Take-home uses simplified federal/state brackets. Zillow · BLS · Numbeo · Q1 2026 · For general guidance only