Future Tax — HRA calculator share URL query keys
Page: https://futuretax.in/tools/hra-calculator/
Query overrides session/localStorage (ft_hra_calc_state_v1).

  basic           Basic salary + DA for the year (₹)
  received        Actual HRA received for the year (₹)
  rent            Total rent paid for the year (₹)
  metro           0.5 for metro (50% rule); 0.4 non-metro default omitted

Browser state: ft_hra_calc_state_v1
Handoff to income tax: ?hra= exempt amount (from “Compare old vs new tax” button)