$40K in Boston = $37,037 in Seattle
Your $40K salary in Boston (COL 162) has the same purchasing power as $37,037 in Seattle (COL 150). Seattle is cheaper — your money goes 7% further there.
Budget breakdown — $40K in both cities
What $40K actually buys you in each city after taxes and core expenses.
| Expense | Boston $40K | Seattle $40K (same salary) |
|---|---|---|
| Monthly take-home | $2,562 | $2,728 |
| 1BR rent | $3,000 | $2,400 |
| Groceries | $418 | $410 |
| Transport | $90 | $100 |
| Utilities | $185 | $120 |
| Internet | $70 | $65 |
| Left after essentials | -$1,201/month | -$367/month |
Frequently asked questions
What is $40K in Boston equivalent to in Seattle?
$40K in Boston (COL index 162) has the same purchasing power as $37,037 in Seattle (COL index 150). That's 7% less than your current salary.
If I move from Boston to Seattle keeping my $40K salary, will I be better off?
Yes. If you keep earning $40K after moving to Seattle, you'd have $834 more per month after core expenses — because Seattle 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: $40K × (150 ÷ 162) = $37,037. This adjusts for differences in housing, food, transport, and general cost of living.
Other salary amounts — Boston to Seattle
Equivalency uses overall COL index ratio. Take-home uses simplified federal/state brackets. Zillow · BLS · Numbeo · Q1 2026 · For general guidance only