How is stamp duty calculated and can it be reduced legally?

Stamp duty is a state government tax charged on property transactions, and it is calculated as a percentage of either the actual sale price or the government-notified circle rate (also called ready reckoner rate or guideline value) for that property and locality, whichever is higher — you cannot reduce your stamp duty simply by declaring a lower sale price than the circle rate. Rates vary significantly by state, typically ranging from around 4% to 8% of the property value, with most states also charging a smaller separate registration fee on top.

What you have heard about women buyers is generally correct — several states, including Delhi, Haryana, Punjab, and Uttar Pradesh among others, offer a reduced stamp duty rate (commonly 1-2 percentage points lower) when the property is registered solely or jointly in a woman's name, as a policy measure to encourage female property ownership. The exact discount and conditions differ by state, and some states require the property to be registered exclusively in the woman's name to claim the full discount, while joint registration may get a partial benefit — this is worth confirming with your state's specific stamp duty notification before assuming the discount applies to your joint purchase.

Beyond the gender-based concession, some states also offer reduced rates for first-time buyers, for properties bought by senior citizens, or under specific affordable housing schemes — it is worth checking your state revenue department's current notifications, since these benefits change periodically through state budget announcements.

Since stamp duty rates and applicable concessions are entirely state-specific and change fairly often, I'd recommend confirming the current rate and any applicable discount for your state directly with a property lawyer or through your state's official stamp duty calculator before your registration date, rather than relying on rates that may be outdated.