Capital Gains Tax Calculator NSW

Capital gains tax (CGT) on New South Wales property follows the same federal rules that apply across Australia — there is no separate NSW CGT. When an investment property in NSW is sold, the capital gain is added to the seller’s taxable income and taxed at the marginal rate (ATO — Capital gains tax overview). NSW-specific costs such as stamp duty (transfer duty) form part of the cost base and directly reduce the taxable gain. The calculator above estimates CGT for NSW property sales.

How Does Capital Gains Tax Apply in NSW?

CGT in Australia is a federal tax administered by the Australian Taxation Office (ATO). There is no state-level capital gains tax in New South Wales or any other state. Whether you sell a property in Sydney, Newcastle, or Wollongong, the same ATO rules apply: the capital gain (sale price minus cost base) is included in your assessable income for the financial year of sale (ATO — Capital gains tax overview).

So why does this NSW-specific page exist? Two reasons. First, many property investors search specifically for “capital gains tax calculator NSW” because they want to confirm whether state-level differences apply — this page answers that question directly. Second, while the CGT calculation itself is federal, your cost base includes NSW-specific items such as transfer duty (stamp duty) paid at purchase, which varies significantly by state and directly affects the size of your capital gain.

If you are an Australian resident individual and held the property for more than 12 months, you may be eligible for the 50% CGT discount, which halves the taxable capital gain before it is added to your income (ATO — CGT discount). This is the single most significant factor in reducing CGT on a property sale.

NSW Stamp Duty and Your CGT Cost Base

When you purchase an investment property in NSW, you pay transfer duty (commonly called stamp duty) to Revenue NSW. This duty is calculated on the purchase price or the property’s market value, whichever is higher. NSW stamp duty is included in your CGT cost base under Element 2 (incidental costs of acquisition), which means it reduces your capital gain when you eventually sell.

For many NSW investment property purchases, stamp duty represents a material part of the cost base. Because that duty is included in the cost base, it directly reduces the capital gain that is eventually taxed.

Surcharge purchaser duty for foreign buyers

Foreign buyers of NSW residential property may also pay surcharge purchaser duty on top of standard transfer duty. If you paid that surcharge at purchase, it also forms part of your CGT cost base and can materially reduce the eventual taxable gain.

What if you received a first home buyer exemption?

If you originally purchased the property as a first home buyer with a stamp duty exemption or concession, and later converted it to an investment property, only the stamp duty you actually paid can be included in your cost base. If you paid no stamp duty due to the exemption, that element of the cost base is zero.

Sydney Property Market and CGT

Sydney’s higher property values mean that even moderate capital growth can produce a large taxable gain. The 50% CGT discount can still materially reduce the taxable portion, but the eventual tax bill can remain substantial because the gain is added to other income for the sale year.

The taxable gain is added to other income for the year of sale and taxed at the marginal rate. Selling in a financial year where other income is lower (for example, after retirement) results in a lower marginal rate on part or all of the gain.

NSW-Specific Worked Example

Assume the following scenario for a Sydney investment property:

• Purchase price: $900,000
• NSW stamp duty paid: $35,000
• Legal fees (purchase): $2,500
• Capital improvements (new kitchen): $15,000
• Div 43 deductions claimed: $10,000
• Sale price: $1,200,000
• Agent commission: $24,000
• Legal fees (sale): $2,000
• Holding period: 7 years (eligible for 50% discount)
• Other income in the sale year: $95,000

Step 1: Calculate the cost base

Step 2: Calculate the capital gain

Capital gain = Sale price - Cost base

$1,200,000 - $968,500 = $231,500

Step 3: Apply the 50% CGT discount

Because the property was held for 7 years (more than 12 months):

Taxable capital gain = $231,500 x 50% = $115,750

Step 4: Calculate estimated CGT

The $115,750 taxable gain is added to $95,000 other income, giving a total taxable income of $210,750. Based on 2025-26 ATO tax brackets, the estimated additional tax on the capital gain is approximately $42,100.

Without the 50% discount, the full $231,500 would be taxable and the estimated CGT would be approximately $78,700 — the discount saved roughly $36,600.

Note: including the $35,000 in NSW stamp duty in the cost base reduced the capital gain from $266,500 to $231,500, reducing the estimated CGT by approximately $6,500 (after the discount and at the applicable marginal rate).

Related NSW Property Calculators

• Land Tax Calculator — estimate your NSW land tax liability based on your total land value. NSW has a tax-free threshold, with rates increasing for higher land values and a premium rate for very large holdings.
• Negative Gearing Calculator — calculate the annual tax benefit of negative gearing on your NSW investment property, including rental income, mortgage interest, and deductions.
• Rental Yield Calculator — compare gross and net rental yields across different NSW properties to assess income performance.
• Investment Property Calculator — model the complete financial picture of an NSW investment property, combining cash flow, tax, and growth projections.