Stamp Duty Calculator

The Stamp Duty Calculator computes Australian property transfer duty the way the states actually charge it: progressive brackets that differ in every state and territory, first-home-buyer concessions that taper or vanish at price thresholds, surcharges for foreign buyers, and a comparison of the duty on the same property in all eight jurisdictions. It also totals the other upfront costs it assumes — conveyancing, inspection, and lender fees — so you see your full cash-to-settlement figure, not just the tax.

How It Works

Duty is a marginal tax: each slice of the price is charged at its bracket's rate, and the slices are summed:

$\text{Duty} = \sum_{\text{brackets}} (\text{Price Slice} \times \text{Bracket Rate})$

Buyer type then adjusts the result. First-home buyers receive a full exemption below their state's threshold, a tapering concession above it in several states, and nothing beyond the cap. Foreign buyers add a surcharge — 9% of price in NSW, 8% in Victoria and Queensland, 7% in WA and SA — on top of the standard duty. The NT uses its own quadratic formula below $525,000 and flat rates above it.

Worked Example: $800,000 in NSW, Owner-Occupier

NSW brackets applied slice by slice:

| Slice of price | Rate | Duty | |---|---|---| | $0 –$17,000 | 1.25% | $212.50 | |$17,000 – $36,000 | 1.50$285.00 | | $36,000 –$97,000 | 1.75% | $1,067.50 | |$97,000 – $364,000 | 3.50$9,345.00 | | $364,000 –$800,000 | 4.50% | $19,620.00 | | **Total duty** | | **$30,530.00** |

Effective rate: 3.82% of the price. Add the assumed conveyancing ($2,000), inspection ($600), and lender fees ($500), and total upfront cost is **$33,630**.

Same property, different buyers and states:

• NSW first-home buyer at $800,000:** full exemption — duty **$0, a saving of the entire $30,530. At **$900,000**, standard duty is $35,030 and the concession halves it (tapering from$800,000 to $1,000,000), for duty of **$17,515**.
• NSW foreign buyer at $800,000:**$30,530 + 9% × $800,000 = **$102,530.
• **Victorian owner at $800,000:**$43,070 — Victoria's 6% mid-bracket makes it the expensive comparison in the all-states table.
• NT at $500,000:** the quadratic formula gives **$23,929.

The Concessions Are Where the Money Is

State thresholds stored in the calculator: NSW exempts first-home buyers to $800,000 (tapering to$1,000,000); Victoria exempts new homes to $600,000 (tapering to$750,000); Queensland exempts new homes at any price and established homes to $550,000 (tapering to$700,000); WA exempts to $500,000 (tapering to$700,000); SA exempts new homes with no price cap; Tasmania exempts to $750,000 and halves duty for other owner-occupiers up to the same cap; the ACT exempts to$1,020,000 under its concession scheme; the NT instead discounts duty by up to $18,601. A property priced just above a threshold can cost five figures more in duty than the same property just below it — check both prices before you negotiate.

Limitations

Rates, brackets, and concessions are stored state settings that change with budgets — treat results as a close estimate and confirm with your conveyancer or state revenue office before settlement. The three added costs are fixed assumptions ($2,000 /$600 / $500), not quotes; your actual conveyancing and lender charges will vary. The calculator covers residential purchase duty for the buyer types listed; land tax, foreign-buyer land surcharges (separate from the duty surcharge), off-the-plan concessions in most states, and corporate or trust-specific rules are outside it.

Frequently Asked Questions

Why is duty charged in slices instead of one rate?

Progressivity: like income tax, only the portion of the price inside a bracket pays that bracket's rate. An $800,000 NSW purchase does not pay 4.5$364,000, which is why the effective rate (3.82%) is lower than the top marginal rate that applied.

Can stamp duty be added to the home loan?

Usually lenders require duty to come from your own funds at settlement, which is why the calculator adds it to your upfront costs. Financing it means a smaller effective deposit and possibly lenders mortgage insurance — the duty figure belongs in your savings target from the start.

Which state is cheapest?

It depends entirely on price and buyer type — the all-states comparison exists because the ranking flips: a first-home buyer pays nothing in most states at $600,000 but very different amounts at$1,200,000, where concessions have vanished and bracket structures diverge. Run your actual price and buyer type and compare the row, not a reputation.