Company capital gains at the prevailing CIT rate.
Capital gains tax
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Chargeable gain
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Net gain after tax
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Your breakdown
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The 10 percent era is over
For decades a Nigerian company that sold an asset at a profit paid a flat 10 percent capital gains tax, and finance teams treated that low rate as a planning gift. The 2025 tax reform changed the rule. Chargeable gains made by a company no longer sit in their own cheap bucket. They are now taxed at the prevailing Companies Income Tax rate, which means the gain on a disposal is treated much like ordinary profit. This calculator reflects that shift: it takes your sale proceeds, subtracts your cost base, and applies the prevailing company rate to whatever profit remains.
The rate this tool applies is 30 percent, mirroring the headline CIT rate. That is a meaningful jump from the old 10 percent, and it is the single most important thing for a company owner or finance lead to understand before signing a sale agreement. Because the reform is still phasing in and the headline company rate can itself be reduced by presidential order, confirm the rate that applies to your disposal date with the FIRS, now reorganised as the Nigeria Revenue Service, before you file.
A note on what this calculator does and does not do
This tool applies the 30 percent rate to the gain regardless of how large or small the selling company is. That is a deliberate simplification of the disposal arithmetic, so do not assume a tiny company automatically escapes the charge here. Whether your specific company qualifies for any relief or a different treatment is a question for your tax adviser and the revenue service, not something the headline figure on this page settles.
Why your cost base is the number that matters
The tax is charged on the gain, not the sale price, and the gain is proceeds minus your cost base. Getting that cost base right is where companies leave money on the table or overpay. The cost base is not just the original purchase price. It can include the incidental costs of acquiring the asset and, in principle, allowable expenditure that enhanced its value. Legal fees on the original purchase, professional valuation costs, and capital improvements to a property are the kinds of items that belong in the cost base if your records support them.
A practical tip drawn from how these disposals actually go wrong: keep the paper trail. If you bought a warehouse, renovated it, and sold it years later, the renovation invoices reduce your taxable gain. Lose those invoices and the revenue service will tax you as though the improvement never happened. The cost base field in this calculator is where all of that allowable cost should be summed before you read the result.
Selling an asset bought at NGN 30 million for NGN 50 million
Work through the default scenario. Your company sells an asset for NGN 50 million. Its cost base, including the original price and allowable acquisition costs, is NGN 30 million. The chargeable gain is the difference, NGN 20 million. Using the rate this calculator applies, that gain is taxed at 30 percent, producing a capital gains tax of NGN 6 million and leaving a net gain after tax of NGN 14 million.
Under the old 10 percent rule the tax on that same gain would have been just NGN 2 million. The reform triples the bill on this disposal, which is exactly why timing and cost-base accuracy now carry real weight.
Is the capital gains tax separate from the company's normal income tax bill?
The gain is taxed at the same rate as company profit, but it is calculated on the specific disposal rather than on trading results. In practice a finance team folds the chargeable gain into the company's tax computation for the year. This tool isolates the disposal so you can see the tax that the sale alone triggers.
What if the asset sold for less than it cost?
Then there is no chargeable gain and no capital gains tax on that disposal. The calculator floors the gain at zero, so entering proceeds below your cost base returns a tax of NGN 0. Capital losses may interact with your wider tax position, which is a matter to raise with your adviser and the revenue service.
Does this cover the sale of shares in another company?
Share disposals have their own reliefs in Nigerian law, including potential relief where proceeds are reinvested. This tool computes the headline gain at the company rate and does not model those share-specific exemptions, so treat it as a starting estimate and confirm the position with the FIRS for any equity disposal.