Where every number comes from
Every statutory figure names the agency that sets it. In the sample above, London tax cites HMRC, transit cites Transport for London, and healthcare and childcare cite ONS, NHS England, and the Coram Family and Childcare Survey 2026. New York tax cites the IRS, SSA, the New York State and City tax schedules, and New York Paid Family Leave. Transit cites MTA fares. Healthcare cites KFF, Peterson-KFF, and the Milliman Medical Index.
Market estimates are labelled just as clearly. New York rents use StreetEasy and Brick Underground. London rents use published rent indices cross-checked against Numbeo. New York childcare uses Care.com market rates. Groceries and discretionary spending use Numbeo. The report flags the lines that deserve a local quote before you decide.
How your report stays current
Every report prints the day it was built and uses our current data whenever you open it. When a rate changes or we correct a source, your link can show the corrected figure the next time you visit.
Why the report uses two currencies
Salaries appear in the destination's currency, the number your recruiter will quote and you will negotiate. Costs also appear in the currency you earn today, so you can judge them against a budget you already know. Read the full method at cityparity.com/methodology.