Stamp Duty Calculator NT 2025-26

What this calculator works out

Northern Territory stamp duty (formally conveyance duty) is the one-off state tax on transferring real property in the NT. It is administered by the Territory Revenue Office (TRO) under the Stamp Duty Act 1978 (NT) and is payable within 60 days of settlement on the dutiable value of the property (the higher of contract price and unencumbered market value).

The NT schedule has two distinct shapes:

• a continuous slope formula for any value up to $525,000, and
• flat percentage bands of 4.95% (up to $3M), 5.65% ($3M-$5M) and 5.95% (above $5M).

Owner-occupiers can claim the Principal Place of Residence Rebate (PPRR) of up to $7,000. There is no first home buyer stamp duty concession in the NT today, and no foreign purchaser surcharge. This calculator applies the FY 2025-26 settings published by TRO and is a general estimate — confirm the exact duty with TRO or a Northern Territory conveyancer before settlement.

The formula and where the rates come from

Below or equal to $525,000 — slope formula:

V    = dutiableValue / 1000
duty = round(0.06571441 × V² + 15 × V)

Above $525,000 — flat bands:

$525,001 – $3,000,000     → value × 4.95%
$3,000,001 – $5,000,000   → value × 5.65%
$5,000,001 +              → value × 5.95%

PPRR rebate (TRO administrative concession):

if owner-occupier within 12 months and stays ≥ 6 months
   rebate = min($7,000, baseDuty)
   dutyPayable = baseDuty − rebate

The slope coefficients and band rates are set out in the Stamp Duty Act 1978 (NT) and published on the TRO conveyance duty pages. The PPRR is an administrative rebate operated by TRO.

How to read the inputs

• Property value — the higher of the contract price and the unencumbered market value. For a typical arm's-length sale this is the contract price.
• Owner-occupied within 12 months — tick if you (or any of the buyers) will move in within 12 months of settlement and live there for at least six months. The PPRR is not restricted to first home buyers — investors who later move in can also claim it. The rebate is automatic in this calculator when ticked.
• First home buyer (information only) — there is no NT FHB stamp duty concession to apply (the previous schemes were abolished from 1 July 2021). The toggle is informational and surfaces a reminder about the separate FHOG ($10,000 for new homes) and HomeGrown Territory Grant.

Worked examples

1. $400,000 Darwin first-time owner-occupier. V = 400 → duty = 0.06571441 × 160,000 + 15 × 400 = 10,514 + 6,000 = $16,514. Owner-occupier → minus $7,000 PPRR = $9,514 payable.

2. $525,000 boundary case. V = 525 → duty = 0.06571441 × 275,625 + 15 × 525 = 18,113 + 7,875 ≈ $25,988. Owner-occupier → −$7,000 = $18,988. Note: just $1 above $525,000 the formula switches to flat 4.95% — duty becomes $26,000 (just $12 more), but the $7,000 PPRR still reduces it.

3. $700,000 Darwin investor. No PPRR. Duty = $700,000 × 4.95% = $34,650. Compare to NSW (~$25,180 base) — NT is more expensive at this price point.

4. $700,000 Darwin owner-occupier. Duty = $34,650 − $7,000 = $27,650.

5. $1.2M new build, owner-occupier. Duty = $1,200,000 × 4.95% = $59,400. PPRR → $52,400. May also qualify for the $10,000 FHOG (new home) and the HomeGrown Territory Grant — both paid separately by TRO and not deducted here.

6. $4M Cullen Bay home. Duty = $4,000,000 × 5.65% = $226,000. The PPRR is still capped at $7,000 even at this price, so the maximum after rebate is $219,000.

7. $6M trophy home. Duty = $6,000,000 × 5.95% = $357,000. Above the top band threshold the marginal rate is fixed at 5.95% on the whole value.

Common pitfalls

• The slope formula uses thousands, not dollars. When you read the formula on the TRO website it expresses V as the value in thousands — easy to misread as dollars and end up with a number 1,000× too small.
• There is no taper at $525,000. The schedule jumps from a smooth curve to a flat 4.95% on the whole value — duty steps up slightly at the boundary rather than continuing smoothly.
• PPRR is not just for first home buyers. Anyone moving in within 12 months can claim it once per property. Check eligibility with TRO if you are also claiming FHOG.
• No NT FHB concession. The NT had a First Home Owner Discount and a First Home Owner Stamp Duty Concession until 1 July 2021. Both have been abolished — current first home buyers rely on FHOG, HomeGrown Territory Grant and the PPRR. Older blogs and templates still mention the old schemes incorrectly.
• No foreign surcharge — but there is FIRB. Foreign buyers do not pay an NT surcharge but still need Foreign Investment Review Board (FIRB) approval and may pay a federal vacancy fee on certain residential investments.
• Land values, not building values. For a vacant land purchase, duty applies to the unimproved value — which can be a small fraction of a turnkey land-and-house package.
• Stamp duty is paid within 60 days of settlement. TRO charges interest if duty is paid late. Most conveyancers settle and lodge automatically.

Related calculators

• Stamp Duty Calculator NSW — for buyers comparing east-coast prices.
• Stamp Duty Calculator ACT — neighbouring territory.
• Stamp Duty Calculator QLD — most common comparison for Darwin investors.
• Foreign Purchaser Surcharge VIC — see what the NT does NOT charge.
• Property Depreciation Calculator (AU) — for investors going forward.

Sources:

• Territory Revenue Office — conveyance duty calculator
• Treasury NT — Territory Revenue Office stamp duty
• nt.gov.au — Stamp duty (taxes, royalties and grants)
• Stamp Duty Act 1978 (NT)