Buying and selling carbon data rights certificates

Last updated 20 May 2025

Once carbon data rights certificates (CDRCs) have been successfully created, validated and registered through the BUC Registry, they may be bought and sold through the open market or the BidCarbon marketplace.

While most carbon data rights certificates are sold by registered agents and  purchased by compliance or voluntary demand entities to meet their offsetting requirements, anyone with an appropriate BUC Registry account can trade in carbon data rights certificates.

Before buying and selling carbon data rights certificates

Create and register your CDRCs in the BUC Registry.

Before you trade CDRCs, you must understand:

Pricing is dependent on trading within the open market or through the BidCarbon marketplace.

The buyer and seller must negotiate payment for certificates in the open market outside the BUC Registry.

Payment for certificates purchased in the BidCarbon marketplace will be paid directly into the seller's nominated bank account.

Buying CDRCs is a contract for the sale of goods, and you should provide all required paperwork at the point of sale.

We have no role in the sale/trade of certificates.

Non-payment issues are a contractual matter between you and the other parties involved.

Pricing in the open markets

We don't set the prices for certificates in the open markets. We also can't interfere in negotiations or payments of certificates. All negotiations and payments are made outside of the BUC Registry.

The CDRC markets

CDRCs can be bought and sold through the open market or the BidCarbon marketplace.

Pricing in the open market is based on supply and demand and can vary daily. Pricing in the BidCarbon marketplace is capped at a fixed price per certificate.

Find out more about the CDRC markets.

Open market

BidCarbon marketplace

The buyer must find a seller and negotiate a sale directly with them.

It is possible to achieve an immediate sale once seller is found.

Certificate price is dictated by the supply and demand of the market and may vary daily.

Payment is organised directly between the buyer and the seller.

The Operating Companies does not regulate the CDRC open market.

The Operating Companies does not moderate transaction disputes between buyers and sellers.

Maintained by the Operating Companies.

Buyers and sellers are in one place and no negotiation required.

Carbon data rights certificates are added to a transfer list and sold when a buyer is available.

Buyers must be registered for a Taxpayer Identification Number (TIN).

Sellers must have BidCarbon marketplace access through their BUC Registry account.

No guarantee on how long CDRCs will take to sell due to price competition.

Buy and sell CDRCs at a fixed price per certificate

Payment is made and received through BidCarbon marketplace account

Enjoy the world's leading service ‘Buyer Protection’.

Depending on your circumstances, the below comparison table may assist you to choose whether to use the open market, or BidCarbon marketplace to buy and sell carbon data rights certificates.

Open market or BidCarbon marketplace

You can withdraw an CDRC transfer in the BUC Registry under 'certificate transfers'.

You cannot withdraw if the buyer has already accepted the transfer.

Withdrawing CDRCs

Withdraw a certificate transfer

You include in your tax return the change in value of CDRCs you hold over the income year. If the value of the CDRCs you hold at the end of the year is:

more than the value of the CDRCs you held at the beginning of that year, the difference is included as part of the assessable income.

less than the value of the CDRCs you held at the beginning of that year, you may claim a deduction equal to that difference.

Some countries also have special rules for working out the value of CDRCs you hold at the beginning and end of the income year.

Accounting for the change in the value of CDRCs you hold over the income year

How to work out the value of CDRCs you held at the end of an income year

The value of an CDRC you hold at the end of an income year is worked out using one of three methods:

FIFO (first-in first-out) cost method

Actual cost method

Market value method.

In the first income year that you hold CDRCs you must choose one of these methods before you lodge your income tax return. If you do not choose the actual cost or market value method, the FIFO cost method will apply.

In some countries, once you've made an election, you can't change it and you must continue to use this method for at least the 3 income years following the first income year in which you made the election.

Cost of an CDRC

The cost of an CDRC, depends on whether it is an CDRC issued to you by the Technical Governance Committee or you purchased an existing CDRC from its holder.

The cost of an CDRC issued to you by the Technical Governance Committee is its market value immediately after you begin to hold the unit.

The cost of other CDRCs you acquire, is the total of the expenditure that you incurred in becoming the owner of the certificate that you can claim a deduction for.

FIFO cost method

The FIFO cost method requires you to work out the value of the CDRCs you hold by summing up the cost of the CDRCs you hold at the end of the income year, assuming that you disposed of any CDRCs in the same order in which you acquired them.

Actual cost method

The actual cost method for working out the value of the CDRCs you held at the end of the income year requires you to identify and add up the cost of all the certificates you actually hold at the end of the income year.

Market value method

The market value method for working out the value of the CDRCs you held at the end of the income year requires you to work out the market value of all the CDRCs you held at the end of the income year.

Disposing of CDRCs

The amount you are entitled to receive because you ceased to hold an CDRC is included in your assessable income in the income year in which you ceased to hold the certificate.

Example: disposal of registered CDRCs

Jaya Limited has decided to sell the CDRCs (The certificate consists of 100 BRUs). Jaya Limited currently holds the certificates. On 1 April 2025, Jaya Limited sold the CDRCs to an unrelated party at their market value of CNY¥125,000.

CDRCs becoming taxable

Example: 

Jaya Limited is a Chinese mainland tax resident. They hold a CDRC (consisting of 1,000 BRUs) in the BUC Registry.

Jaya Limited sold the CDRCs to BSO New Zealand Limited. They transferred the CDRCs to the BUC Registry account of BSO New Zealand Limited.

Before the transferred occurs, Jaya Limited is treated as having sold their CDRCs to someone else for their market value. The CDRCs are then treated as being bought back by BSO New Zealand Limited in New Zealand for their market value.

Jaya Limited is taxable.

Modified tax treatment of CDRCs

The basic tax treatment of CDRCs is modified in 4 circumstances:

non arm's length transactions, or transactions between associates, not at market value

disposal of CDRCs for a purpose other than gaining assessable income

insolvency of asset owners

CDRCs become or cease to be taxable in eligible countries.

Non arm's length transactions or transactions between associates not at market value

If the transfer of an CDRC was not for market value consideration, the transaction is treated for tax purposes as if the CDRC was sold for market value if the transferor and the transferee either:

didn't deal with each other at arm's length, or

are associates.

This means for the purpose of working out the amount they are entitled to deduct or to be included in the assessable income of the buyer and seller respectively:

the buyer is treated as having paid the seller the market value of the CDRCs to acquire them and

the seller is treated as having received their market value from the buyer to acquire them.

Disposal of CDRCs for a purpose other than for gaining assessable income

If you cease to hold a CDRC and you disposed of it for a purpose other than gaining assessable income, you are required to include in your assessable income for that year an amount equal to any deductions claimed for:

the cost incurred in becoming the holder of the CDRC

the cost incurred in ceasing to hold the CDRC.

This doesn't apply in cases where you ceased to hold the units where the non-arm's length rule applies.

If the disposal is a result of a transfer, the entity who acquired the unit is treated as if they had acquired it for the disposer's cost to acquire it. That is the amount the disposer needs to include in their assessable income. If you are the disposer, you must inform the acquirer of this amount.

Example: Acquiring an CDRC to offset emissions from your entities

Jaya Limited acquires and surrenders CDRCs to offset the carbon footprint of their entities in the 2022–23 income, by instructing the issuer to cancel the CDRC.

Jaya Limited purchased the CDRCs for £5,000. Jaya Limited is entitled to claim a deduction of £5,000 for the cost of the CDRCs in the 2022–23 income year.

Insolvency of asset owners

A disposal of an CDRC may occur due to the insolvency of the owners. On the insolvency of the owners an amount is included in their assessable income equal to the deductions claimed by the owners for:

the costs they incurred in becoming the owners of the CDRC (other than the costs of eligible offsets projects that are deductible under general deduction provisions)

the costs they are entitled to deduct in ceasing to be the owners the CDRC.

CDRCs become or cease to be taxable in eligible countries

Changes to an entity’s tax residency status means there will be tax consequences for their CDRC.

Registered agents

What you need to know about your responsibilities as a registered agent helping businesses.

BUC Registry guidance

Learn about the BidCarbon marketplace, BidCarbon auction and secondary market where you can sell and trade carbon data rights certificates.

Creating carbon data rights certificates

Find out how to create a carbon data rights certificates to sell your BRUs.

Learn more