What it means
The taxable gain is the number the tax authority cares about when an asset is sold. It is rarely the same as the accounting profit on disposal, because tax rules adjust the cost of the asset in ways the accounts do not.
Depreciation already claimed is the biggest of those adjustments. The figure matters because a large headline sale price can hide a modest gain, and a modest price can hide a large one.
A property held for twenty years and heavily depreciated may show a substantial taxable gain even if it sells for little more than the original price. Owners planning an exit need the gain figure rather than the price to know what they will keep.
The calculation starts with proceeds net of selling costs such as agent fees and legal fees. From that you subtract the adjusted basis: original cost, plus capital improvements, less depreciation or capital allowances already claimed.
The difference is the taxable gain. Rates often differ by asset type and holding period.
Many systems tax the portion of the gain that represents recaptured depreciation at a higher rate than the rest, so a single sale can face two rates at once. Losses on other disposals can usually be set against gains in the same year, and unused losses carry forward.
Reliefs such as rollover into a replacement asset or an exemption on a main home can reduce or defer the gain further. None of these apply automatically, and each has to be claimed.
In practice
Real-world examples.
Example
A founder sells a minority stake bought for $120,000 for $450,000 and pays $15,000 in transaction fees. Net proceeds are $435,000 and the taxable gain is $435,000 - $120,000 = $315,000, so at 20% the tax is $63,000. She keeps $450,000 - $15,000 - $63,000 = $372,000 before any relief is claimed.
Example
A dental practice sells equipment for $40,000 that originally cost $95,000 and has a tax written-down value of $28,000. Even though the equipment sold for far less than it cost, there is a taxable gain of $40,000 - $28,000 = $12,000 because depreciation had already been claimed. The owner had assumed a loss and had not budgeted for the charge.
Example
An investor realises a $70,000 gain on shares in June and a $25,000 loss on a second holding in November. The loss is set against the gain, leaving a net taxable gain of $45,000 and cutting the tax at 20% from $14,000 to $9,000. Timing the second sale into the same tax year is what made the offset possible.
Formula
Calculation
Adjusted cost basis = Original cost + Capital improvements - Depreciation claimed
Taxable gain = Net sale proceeds - Adjusted cost basis
Worked example. Larkfield Distribution sells a warehouse it bought for $600,000. Over the holding period it spent $90,000 on a qualifying extension and claimed $150,000 of depreciation for tax.
The adjusted cost basis is $600,000 + $90,000 - $150,000 = $540,000.
The warehouse sells for $850,000 with $30,000 of agent and legal fees, so net proceeds are $850,000 - $30,000 = $820,000. The taxable gain is $820,000 - $540,000 = $280,000.
Tax is charged in two parts. The $150,000 of recaptured depreciation is taxed at 25%, giving $37,500, and the remaining $280,000 - $150,000 = $130,000 is taxed at 20%, giving $26,000. Total tax on the sale is $37,500 + $26,000 = $63,500.Case study
Seen in the real world.
Ashgrove Print Works is an illustrative, fictional company that sold its original factory to fund a move to a larger site. The building had cost $700,000 twenty-two years earlier, had taken $180,000 of qualifying improvements, and $260,000 of capital allowances had been claimed on its fixtures, giving an adjusted basis of $700,000 + $180,000 - $260,000 = $620,000.
The sale price was $1,450,000 with $50,000 of costs, so net proceeds were $1,400,000 and the taxable gain was $1,400,000 - $620,000 = $780,000. The directors had budgeted on net proceeds less original cost, or $700,000, so they were $80,000 light on the gain and, at a 20% rate, $16,000 short on the tax.
Because the company reinvested the proceeds in a replacement property within the allowed window, it claimed rollover relief and deferred most of the gain into the new building's cost basis. The illustrative point is that the adjusted basis rather than the purchase price sets the gain, and that reliefs exist but must be claimed deliberately.
Watch out
Common mistakes.
- Calculating the gain against the original purchase price rather than the adjusted basis. Improvements raise the basis and claimed depreciation lowers it, and both change the tax due.
- Forgetting to deduct selling costs from the proceeds. Agent fees, legal fees and survey costs usually reduce the gain and are easy to leave out of a quick estimate.
- Assuming a sale below original cost cannot produce a taxable gain. Once depreciation has been claimed, the written-down value can sit far below the sale price even when the price is below cost.
Questions
People also ask.
Is a taxable gain the same as accounting profit on disposal?
No, the accounting profit uses the book carrying value while the taxable gain uses the tax basis, and the two differ whenever tax and accounting depreciation differ.
Can a loss on one asset reduce the tax on a gain on another?
In most systems yes, capital losses in the same year offset capital gains, with any excess carried forward to future years.
Does reinvesting the proceeds avoid the tax?
Not automatically, but specific rollover or replacement-asset reliefs can defer the gain into the new asset's basis when the conditions and time limits are met.
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