A useful city comparison answers three different questions: how do broad prices differ, how would your own monthly budget change, and how much cash would the move require? Keep these separate. Combining an estimated city index with a personal salary does not turn every output into a personalized quote.
1. Set a consistent comparison
Choose the origin and destination in MoveNumbers. Enter the same gross annual income to isolate the model's price effect. Then separately consider any actual job-offer difference. Record the cities, salary and source assumptions so you can reproduce the result later.
The equivalent-salary formula is income × (0.40 + 0.60 × destination index / origin index). For $100,000 and an index ratio of 1.10, the result is $106,000. The implied monthly difference is negative $500: ($100,000 − $106,000)/12. This does not calculate tax or guarantee that your spending will rise by $500.
2. Replace the largest estimates first
Use the same bedroom count and roughly comparable housing when collecting rent or ownership quotes. Account for included utilities, parking and recurring fees. For an owner, mortgage principal is a cash-flow requirement but also builds equity; it is not identical to an unrecoverable rent expense.
Then replace transportation, childcare, healthcare and other large household-specific amounts. The comparison tool's standard categories do not automatically adjust for the number or ages of children.
3. Use take-home income for the final budget
Gross salary is useful for comparing job offers. Your spending budget needs the amount after payroll deductions and any other required payments. Employer benefits, retirement contributions and your filing situation can change that amount. Confirm your own inputs rather than treating a broad state tax estimate as a tax return.
4. Separate the move from life after the move
A hypothetical $4,800 moving expense and $400 monthly improvement produce a simple 12-month recovery period. A refundable deposit is cash tied up, while a mover's invoice is a cost; track both but do not automatically treat them as the same. Also include any overlap between leases.
5. Test uncertainty
Repeat your budget with rent $200 higher, one extra commute cost or a delayed start date. Those are scenarios you choose, not forecasts. If the result depends on every favorable assumption happening at once, the headline savings are fragile.
Review source years, city fallbacks and calculation limitations before relying on the result. For rent-source context, consult HUD's Fair Market Rent documentation. Saved area estimates help you investigate places; actual offers and household needs determine the final decision.