Carbon Credits as an Investment for Americans in Britain
Carbon credits have become a genuine portfolio holding rather than a corporate compliance chore. Wealthy investors in London now buy them directly, through brokers or through specialist funds, betting that tightening regulation will lift prices over a decade. The market is liquid enough to trade and opaque enough to reward research, which is exactly the combination that attracts sophisticated money.
The tax position, however, is the least settled of any mainstream asset. Neither HMRC nor the IRS has issued statutory guidance on how an individual investor is taxed on carbon credits. Consequently, you are applying general principles to an asset that fits none of the usual categories, in two countries at once, and the two answers can differ on character, on timing and on whether a loss is relievable at all.
At TaxYork we prepare both returns for Americans holding British and European assets. In our experience, this is the holding where clients most often assume their preparer has a rule to follow. There is no rule. Instead, there is a defensible position that has to be chosen, documented and applied consistently, and the cost of choosing badly is unusually high.
Why Carbon Credits Sit in a Tax Vacuum
Most assets announce what they are. A share is equity, a bond is debt, a flat is land. Carbon credits are none of these. Each one is a tradeable certificate representing a tonne of greenhouse gas avoided or removed, issued by a registry and extinguished when someone retires it against their own emissions. Therefore, it behaves partly like a commodity, partly like an intangible right and partly like a licence.
That ambiguity matters because tax systems allocate consequences by category. Furthermore, an asset that can be consumed rather than sold raises a question almost no other investment does: what happens when you destroy it deliberately?
Compliance Markets and the Voluntary Market
Two markets exist, and they are taxed differently. The UK Emissions Trading Scheme is a compliance market: installations must surrender allowances against their actual emissions, and the Government publishes the rules for participating in the UK ETS. The voluntary market, by contrast, has no legal compulsion behind it; buyers retire credits for reputational or contractual reasons.
Most private investors hold voluntary units. Accordingly, this article addresses those, although the American analysis of allowances is broadly similar.
What You Actually Own
You own an entry in a registry account, transferable to another account holder. You do not own land, trees or equipment. Consequently, the reliefs that attach to British woodland or farmland do not reach your carbon credits, even where the underlying project is a British forest.
How Britain Taxes Carbon Credits in 2026
The British answer on carbon credits turns on whether you are trading or investing, and on a VAT change that caught the market by surprise.
Are Carbon Credits Income or Capital? HMRC Is Silent
There is no dedicated legislation. For an individual investor buying and holding units for appreciation, the natural analysis is that each credit is an asset for capital gains purposes, so a disposal produces a chargeable gain taxed at 24 per cent for a higher or additional rate taxpayer under the current capital gains tax rates.
Frequent, organised dealing points the other way. Where the badges of trade are present, profits become trading income taxed at up to 45 per cent, with National Insurance on top. Therefore, the number of transactions, the holding period and the degree of organisation all matter, and an investor in carbon credits should be able to evidence an investment intention from the outset.
The VAT Change From September 2024
The market's most concrete British development is a VAT change. In a Revenue and Customs Brief published on 9 May 2024, HMRC confirmed the VAT treatment of voluntary carbon credits: from 1 September 2024 most such credits are taxable at the standard rate where the place of supply is the United Kingdom.
For a private investor who is not VAT registered, that VAT is not recoverable. Consequently, it is simply part of what you paid, and it belongs in your base cost on both returns. Additionally, it raises your entry price by a fifth, which changes the return the investment must generate before you are ahead.
Landowners, Carbon Credits and the Annual Income Risk
A different analysis applies if you own the land generating the units. Where a sale of credits is linked to the value of the trees or the land and happens once, capital treatment is arguable. However, where the land produces units year after year, HMRC is far more likely to see ongoing income. Consequently, landowners and pure investors in carbon credits can reach opposite answers on identical certificates.
How the IRS Treats the Same Carbon Credits
America has no specific rules on carbon credits either, so the analysis runs on general principles and on the taxpayer's own circumstances.
Investor, Dealer or Business
The character of your profit follows how you hold the asset. An investor holding intangible property produces capital gain, long term where held more than a year, taxed at up to 20 per cent. A dealer holding credits as inventory under section 1221 produces ordinary income at up to 37 per cent.
That seventeen-point spread is the single largest number in this article. Furthermore, the classification is factual rather than elective, so it must be supported by how you actually behave: frequency of trades, marketing activity, and whether you hold for appreciation or turn units over quickly.
Receipt, Basis and the Cost of Your Carbon Credits
Where credits are received rather than bought, for example as consideration for a project, the recipient has income equal to their fair market value on receipt and takes that amount as basis. For an investor who simply buys units, basis is the purchase price including irrecoverable VAT and broker fees. Accordingly, keeping the purchase documentation matters more than usual, because the registry statement alone will not show what you paid.
The 3.8 Per Cent Surcharge
Gains on carbon credits held for investment are net investment income, so the net investment income tax applies at 3.8 per cent. The Tax Court has refused a treaty-based credit against that charge. Therefore, it is a genuine American cost that British tax cannot relieve, whatever else you do.
Where the Two Systems Collide
Your carbon credits are identical in both countries; the two tax treatments need not be. Three collisions account for most of the avoidable cost.
The Character Mismatch
Suppose Britain treats you as an investor and taxes a gain at 24 per cent, while your American return treats you as a dealer and charges 37 per cent plus the surcharge. The foreign tax credit relieves only the British tax actually paid, so roughly seventeen points of American tax survive. Consequently, consistency across the two returns is worth more than any other planning point here.
Sourcing and the 10 Per Cent Test
A gain on intangible personal property is generally sourced by the seller's residence under section 865. A US citizen with a British tax home is treated as a non-resident for this purpose only where at least 10 per cent British tax is paid on the gain. British capital gains tax at 24 per cent clears that threshold comfortably, so the gain is foreign source and the credit works.
Where British tax is nil, however, the test fails and the income stays American source with no credit available. Therefore, a year in which your British losses wipe out the gain is precisely the year in which American tax can appear.
Retiring Carbon Credits: The Disposal With No Proceeds
Retirement of carbon credits is the collision nobody anticipates. Retiring a credit extinguishes it permanently against emissions, and you receive nothing. For an investor, that looks like the abandonment of a capital asset, which should produce a capital loss rather than a deduction. Meanwhile, a business retiring credits for its own operations may be able to treat the cost as a deductible expense instead.
Consequently, the same act produces very different results depending on who does it and why. Accordingly, decide before you retire anything whether you are acting as an investor or as a business, because the answer determines the relief.
When Carbon Credits Fail: Losses and Worthlessness
The voluntary market in carbon credits has a quality problem. Projects have been delisted, methodologies revised and units stranded, so loss relief is not an academic question.
The British Negligible Value Claim
Where carbon credits become worthless while you still own them, section 24 of the Taxation of Chargeable Gains Act 1992 allows a negligible value claim, treating you as having sold and reacquired them at nil. The resulting capital loss offsets gains of the same year and carries forward indefinitely.
The American Loss and Its Limits
America gives a loss on worthlessness too, but it is a capital loss for an investor, and capital losses offset capital gains without limit yet only $3,000 of ordinary income a year. Furthermore, there is no American equivalent of the negligible value claim, so the American loss depends on establishing that the asset became worthless in that year. Therefore, align the two claims in the same tax year wherever the facts allow, because a British claim in one year and an American loss in another strands relief on both sides.
The Questions to Ask Before Buying
Before committing capital, ask which registry issues the units and whether it publishes retirement data, what the project methodology is and when it was last revised, whether the vendor will provide a VAT invoice, and whether the units are transferable to another account holder without consent. Additionally, ask how the seller has treated the sale for its own tax purposes. Professional bodies such as the Chartered Institute of Taxation, the ICAEW and the AICPA all emphasise that cross-border investors need advice on their own facts, not the promoter's summary.
Reporting and Structures
The reporting position for carbon credits is unusual, and it depends heavily on how you hold them.
Form 8938 and the FBAR Position
A registry account is not a bank or securities account, so it does not itself go on the FinCEN Form 114. However, where you hold units through a non-US broker, dealer or fund, the holding is a financial asset with a foreign counterparty and counts towards Form 8938, whose thresholds for an American abroad are $200,000 at year end or $300,000 at any time, doubled for joint filers. The IRS sets out the interaction in its comparison of Form 8938 and FBAR requirements, and our FBAR and FATCA reporting service covers both.
Funds, Companies and the PFIC Question
Many investors reach this market through a fund. A fund organised as a company outside the United States will almost certainly be a passive foreign investment company, because its income is passive, which converts your capital gain into ordinary income with an interest charge unless you elect otherwise in the first year. A fund organised as a limited partnership, by contrast, is transparent and passes the character through. Consequently, the wrapper can matter more than the underlying units.
If the Filings Were Missed
Where earlier returns omitted gains or foreign asset reporting, and the failure was not wilful, the IRS Streamlined Filing Compliance Procedures allow three years of amended returns and six years of FBARs with penalties waived for qualifying non-residents. Our Streamlined filing service prepares the missing schedules within that submission.
A Worked Carbon Credits Case Study With Real Numbers
Consider Helena, an American private investor living in London. In 2025 she bought 40,000 voluntary units at £14 each, plus VAT at 20 per cent, so her cost was £16.80 a unit, or £672,000. She held them for appreciation and made no other transactions.
The Position Before We Reviewed It
In 2026 she sold 25,000 units for £22 each, realising £550,000 against a cost of £420,000, a gain of £130,000. In the same year the registry delisted the project behind her remaining 15,000 units, which cost £252,000 and became unsellable.
Britain was straightforward. She claimed negligible value on the delisted units, and the resulting capital loss of £252,000 extinguished the £130,000 gain, leaving no capital gains tax and £122,000 of losses to carry forward.
Her American preparer reached a very different answer. Treating her as a dealer, the return reported the £130,000 gain as ordinary income, roughly $169,000 at the rates used, producing about $62,500 of American tax plus $6,400 of surcharge. Additionally, the preparer omitted the worthless units entirely, on the basis that a negligible value claim has no American counterpart.
What the Repairs Produced
We amended the return on two points. Firstly, the facts supported investor rather than dealer status: a single purchase, a single sale, a long hold and no marketing activity. Consequently, the gain became long-term capital gain. Secondly, the delisting established worthlessness in the same year, so the American capital loss of roughly $327,000 arose alongside it.
Netted together, the loss exceeded the gain, so no American tax arose on the disposal and no surcharge was payable, with a capital loss carried forward for future gains. The saving against the original filing was close to $69,000. Importantly, the result depended entirely on claiming both sides in the same year, which is the point most easily lost when two advisers work separately.
How TaxYork Can Help
We prepare the American and British returns together, which is the only way to keep one consistent characterisation across both. Carbon credits punish inconsistency more than most assets, because the underlying law in both countries is silent and the positions therefore rest on the facts you document.
Our work starts with the acquisition records. We fix the base cost including irrecoverable VAT, evidence the investment intention, and decide investor or dealer status once for both returns. Furthermore, we align worthlessness and negligible value claims in the same tax year, test the sourcing so the credit survives, and handle the Form 8938 and PFIC consequences of any fund wrapper.
For clients considering an entry, we model the after-tax return at both the investor and dealer characterisations before capital is committed. Our US tax return preparation for expats and treaty work bring the two filings into a single process.
Conclusion
Carbon credits are the rare asset where neither tax authority has written the rules. Britain has confirmed only the VAT position, standard-rating most voluntary units from 1 September 2024, and leaves income against capital to general principles. America likewise leaves the answer to whether you are an investor, a dealer or a business.
That silence is not neutral. It means the character of your profit, the relief for your losses and the survival of your foreign tax credit all depend on facts you can influence and evidence you can keep. Ultimately, the investor who documents an investment intention, aligns the loss claims across both countries and holds through the right wrapper pays capital rates once. The investor who leaves each return to a separate adviser can pay ordinary rates in America on a gain Britain has already taxed, and lose the relief for worthless units entirely.
Contact Us
If you hold, or are considering, carbon credits while living in Britain, we should agree the position before your next disposal or retirement. Please contact us to discuss your holdings, your registry statements and any filings that were missed.
Email hello@taxyork.com or telephone 020 3488 8606. Alternatively, book a consultation and we will review your last three years of returns alongside your UK Self Assessment before recommending anything.
Disclaimer
This article provides general information on carbon credits and does not constitute tax, legal or investment advice. The tax treatment of these assets is unsettled in both countries and depends on individual circumstances and on legislation in force at the time. You should obtain professional advice before acting on anything set out above. TaxYork accepts no liability for action taken in reliance on this article.