Future Tax — advance tax calculator share URL query keys
Page: https://futuretax.in/tools/advance-tax-calculator/
Query overrides session/localStorage (ft_adv_calc_state_v1).

  tax             Estimated annual tax liability (₹)
  tds             Expected TDS / credits for the year (₹)
  paid            Advance tax already paid — cumulative (₹)
  pres            1 for presumptive 44AD / 44ADA (100% by 15 March)

Browser state: ft_adv_calc_state_v1
Net advance = max(0, tax − tds). Cumulative targets: 15% · 45% · 75% · 100% (unless pres=1).