How the Stamp Duty Calculator (NSW) Works (With a Worked Example)
Estimates NSW transfer (stamp) duty on a property purchase. This guide walks through what each input means, the formula behind the answer and a worked example using typical Australian figures. You can follow along in the free Stamp Duty Calculator (NSW).
Why it matters
Buying property in Australia involves a deposit, stamp duty, lender requirements such as the APRA serviceability buffer, and ongoing repayments that move with interest rates. Investors also weigh rental yield, negative gearing and capital gains tax.
What you need to enter
The calculator asks for 1 input. The table shows each one with the example value used later in this guide.
| Input | Example value |
|---|---|
| Property price ($) | 850000 |
The formula
Duty is a fixed amount plus a percentage above each threshold, from 1.25% up to 5.5%. Thresholds are indexed each 1 July.
Worked example
Entering the example values above gives these results:
| Result | Value |
|---|---|
| Estimated transfer duty | $32,779.00 |
| As % of price | 3.86% |
| Price plus duty | $882,779.00 |
The headline figure is $32,779.00 (estimated transfer duty). Change any input in the calculator and every result updates instantly, so you can test different scenarios side by side.
How the estimated transfer duty changes with property price
The table below keeps every other input at the example value and moves only “Property price ($)” up and down by 10% and 20%. It shows how sensitive the estimated transfer duty is to that one figure.
| Property price ($) | Estimated transfer duty |
|---|---|
| 680,000 | $25,129.00 |
| 765,000 | $28,954.00 |
| 850,000 | $32,779.00 |
| 935,000 | $36,604.00 |
| 1,020,000 | $40,429.00 |
At 680,000 the result is $25,129.00; at 1,020,000 it is $40,429.00. If a small change in this input moves the answer a lot, it is worth double-checking that figure before you rely on the result.
A practical tip
Eligible first home buyers in NSW pay no duty on homes up to $800,000 with concessions to $1 million. This calculator shows general rates only.
Keep going
Before relying on the number, read Getting the Most From a Stamp Duty Calculator (NSW): Tips and Common Errors. You might also find these guides useful:
- Home Deposit Savings Calculator: Formula, Example and What the Result Means
- Using a LVR Calculator in Australia: A Step-by-Step Guide
- Extra Mortgage Repayments Calculator Explained for Australians
Frequently asked questions
- Do these calculators match what my bank will say?
- Lenders use their own models, expense benchmarks and policies. Use these results to prepare, then speak to a lender or broker.
- Are stamp duty rates current?
- Duty thresholds are indexed or changed regularly. Always confirm with your state revenue office before relying on a figure.
- Is this financial advice?
- No. The calculators give general estimates only and don’t consider your objectives or financial situation.
Run your own numbers in the Stamp Duty Calculator (NSW).
Open the calculatorGeneral information only. Rates and thresholds change, usually on 1 July. Confirm current figures with the ATO or the relevant authority, and get personal advice for decisions about your situation.