FASB Carbon Credit Rules: What CPA Firms Should...

Key Takeaways

FASB issued ASU 2026-02 for environmental credits and related obligations.
The new Topic 818 gives rules for recognition, measurement, presentation and disclosure.
Credits can include carbon offsets, emissions allowances, renewable energy certificates and similar items.
Public business entities use the rules for periods beginning after Dec. 15, 2027.
Other entities use the rules for periods beginning after Dec. 15, 2028.

FASB has filled a real gap in accounting rules. On May 19, it issued ASU 2026-02 for environmental credits and environmental credit obligations.

That sounds hard. The core idea is simple. If a client buys, earns or owes credits tied to pollution, fuel, renewable energy or similar programs, accountants now have a clearer GAAP rulebook.

What did FASB change?

FASB added Topic 818, which tells companies how to record environmental credits and related obligations in financial statements.

Before this, companies often used different methods. Some treated credits like inventory. Some treated them like intangible assets. Some had obligations that were hard to compare across companies.

The new rules do not tell companies how green they are. They tell accountants how to record credits, obligations and disclosures.

What is an environmental credit?

An environmental credit is a right or certificate that can be used, sold or turned in under an environmental program.

Examples include carbon offsets, emissions allowances, renewable energy certificates and renewable identification numbers. A company may buy a credit. It may earn one. It may also owe credits because of a law or program.

For a small-firm CPA, the question is not "Is my client a climate company?" The better question is "Does my client buy, sell, hold or owe these credits?"

Client type	What to ask	Why it matters
Energy or fuel	Do you buy, sell or owe fuel credits?	Credits may be part of compliance costs
Manufacturing	Do you hold emissions allowances?	Credits may affect assets or obligations
Renewable energy	Do you generate or sell energy certificates?	Credits may create revenue or assets
Public company supplier	Do customers require credits or offsets?	Contracts may create new accounting questions

Which clients should CPAs check first?

Start with clients most likely to touch environmental credits. That includes energy, fuel, utilities, agriculture, manufacturing, transportation and companies with renewable energy projects.

Also check clients that made climate promises or bought offsets for customers. A voluntary promise can still create records that need review.

Do not assume small clients are out of scope. Some small companies sit inside bigger supply chains. A customer contract can create credit activity even when the client does not think of itself as an environmental business.

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What records should firms ask for?

Ask for the paper trail. Credits are easy to describe but hard to audit without records.

Credit purchase agreements
Credit sale records
Program notices or compliance letters
Registry statements
Contracts that mention credits or offsets
Management's calculation of any credit obligation
Prior-year accounting treatment

The goal is not to become an environmental expert. The goal is to know whether credits exist, who owns them, how they were valued and whether the client has an obligation.

Ask for both accounting records and source records. A journal entry tells you how management recorded the credit. A registry statement or contract tells you what the credit is. You need both to understand the accounting story.

If the client cannot show where a credit came from, who owns it or how it can be used, that is a review issue. It may also be a control issue.

When do the new rules start?

Public business entities must apply the new rules for annual and interim periods beginning after Dec. 15, 2027.

Other entities have more time. They must apply the rules for annual periods beginning after Dec. 15, 2028 and interim periods beginning after Dec. 15, 2029.

Early adoption is allowed. That gives firms time to plan, but not time to ignore the issue.

Put the dates in the firm's standards calendar now. That helps managers know when to train staff, when to ask clients new questions and when to review prior accounting treatment.

Nexairi analysis: the first job is finding the clients

The hardest part may not be the accounting. It may be finding the clients who have credits in the first place.

Many small and mid-size clients will not use the phrase "environmental credit." They may say offset, allowance, REC, RIN, renewable certificate or compliance credit. Engagement teams need to ask in plain words.

What should CPAs add to the engagement checklist?

Add one short question to the client intake or year-end checklist: "Did the company buy, sell, earn, hold or owe any environmental credits this year?"

If the answer is yes, ask follow-up questions:

What program created the credit?
Who owns the credit now?
Was the credit bought, earned, sold or used?
Does the company owe credits at year-end?
How did management value the credit?
Where are the registry or contract records?

Those questions will not solve every issue. They will keep the firm from missing the issue entirely.

If the client says no, keep the answer in the workpaper file. If the client says yes, assign one person to collect the support. Do not let the answer sit in an email thread.

What is the first control to add?

The first control is a credit log. It can be simple. List each credit, source, date, amount, program, owner and status.

Then add one column for use. Was the credit sold, held, used to settle an obligation or still open at year-end? That one column helps staff see whether the credit is an asset, part of a liability question or part of a disclosure question.

A credit log also helps new staff. They do not have to read every contract first. They can start with the list, then pull support for the items that matter.

Can AI help with this work?

AI can help draft a checklist or summarize public guidance. It should not replace source review or professional judgment.

If staff use AI, keep client data out of unapproved tools. Use generic examples or approved firm systems. For live client records, use the firm's data rules first.

This is a good place to pair the FASB update with a clear internal AI policy. Accounting rules are changing and so are the tools staff use to read them.

What should firms do now?

Do three things before year-end planning starts.

Make a list of clients in higher-risk industries.
Add one environmental-credit question to intake and close checklists.
Save a copy of the new effective dates in the firm's standards tracker.

That is enough for a first pass. If a client has credits, then the firm can decide whether it needs a deeper accounting memo.

FASB Carbon Credit Rules: What CPA Firms Should Check