California’s Low Carbon Fuel Standard, known as the California LCFS, is a market-based program run by the California Air Resources Board (CARB) that assigns every transportation fuel sold in the state a lifecycle carbon score and forces the overall fuel pool to get cleaner each year.1California Air Resources Board. AB 32 Global Warming Solutions Act of 2006 Fuels that beat the annual benchmark earn credits. Fuels that miss it generate deficits, and the companies holding those deficits have to buy credits to cover them. Major amendments effective July 1, 2025 made the compliance curve substantially steeper than it was under prior rules, so what the program asks of regulated parties in 2026 is not what it asked two years ago.
What the 2024 Amendments Changed
CARB adopted the current version of the regulation in late 2024, and it took effect on July 1, 2025.2California Air Resources Board. Proposed Low Carbon Fuel Standard Amendments The new targets call for a 30 percent reduction in the carbon intensity of California’s transportation fuel pool by 2030 and a 90 percent reduction by 2045, both measured against a 2010 baseline.3California Air Resources Board. CARB Updates the Low Carbon Fuel Standard to Increase Access to Cleaner Fuels and Zero Emission The earlier version of the program topped out at a 20 percent reduction in 2030 with nothing scheduled after that.
Two features of the new schedule matter for planning. First, there was an immediate 9 percent step-down in the annual benchmark in 2025, with steeper annual reductions beginning in 2031. Second, starting in 2028, an automatic acceleration mechanism can tighten the schedule further on its own. If the ratio of banked credits to annual deficits exceeds three-to-one, the entire reduction trajectory shifts forward by one year. CARB built the mechanism to draw down a surplus of roughly 38 million credits that accumulated under the older, looser targets. It can only trigger once per year, but the effect compounds if the surplus persists.
Who Has to Participate
The regulation calls regulated parties “fuel reporting entities.” For gasoline, diesel, and other liquid fuels, that is the producer or importer who first brings the fuel into California. When a fuel is blended from a fossil component and a renewable component, the producer or importer of each component reports separately.4Legal Information Institute. California Code of Regulations Title 17 95483 – Fuel Reporting Entities For gaseous fuels, it depends: biomethane producers or importers report the renewable portion of compressed natural gas or hydrogen, while the owner of the fueling equipment typically reports the fossil portion.
Being a fuel reporting entity is not optional. If your fuel exceeds the annual benchmark, you accumulate deficits that must be retired. Participation on the other side of the market is optional. Providers of low-carbon energy, including electricity, hydrogen, and renewable natural gas, can opt in to generate credits they can hold or sell.5Legal Information Institute. California Code of Regulations Title 17 95483.2 – LCFS Data Management System
How Credits and Deficits Are Generated
Every fuel pathway in the program gets a carbon intensity score in grams of CO2 equivalent per megajoule (gCO2e/MJ). The score covers the full lifecycle: feedstock production or extraction, processing, transportation into California, and combustion in a vehicle. CARB calculates these scores using its California-modified GREET model, which accounts for feedstock type, production method, and energy inputs specific to each pathway.6California Air Resources Board. LCFS Pathway Certified Carbon Intensities Some pathways, such as dairy-derived biomethane, score negative, meaning the lifecycle emissions reduction exceeds the emissions from burning the fuel.
Each year the benchmark drops. A fuel whose score sits below the current benchmark generates credits proportional to the gap. A fuel above the benchmark generates deficits. That is the engine of the whole program, and the 2024 amendments made the annual drops considerably steeper than they used to be.
Registration and Pathway Documentation
Before you can report, trade, or generate anything, you have to register in the LRT-CBTS, the online system CARB uses for reporting, credit banking, and transfers.5Legal Information Institute. California Code of Regulations Title 17 95483.2 – LCFS Data Management System Registration requires legal business information, a federal employer identification number, and designated authorized representatives.
Credit generation needs more. Fuel providers have to apply for certified fuel pathways by submitting engineering data, feedstock sourcing records, and production process documentation. For each batch of fuel, you need precise volume measurements, feedstock identification, and verifiable chain-of-custody records showing where the fuel came from and how it got to California. Bills of lading, invoices, and production logs all feed that trail. This is where most compliance problems start. CARB can deny credit applications or impose fines when the underlying data does not hold up.
Reporting Deadlines
The program runs on quarterly reporting with an annual reconciliation. Quarterly fuel transaction data goes into the LRT-CBTS within 45 days after each quarter closes, and reporting entities then have another 45 days to reconcile with business partners and fix errors.7Legal Information Institute. California Code of Regulations Title 17 95491 – Fuel Transactions and Compliance Reporting Final quarterly submission deadlines fall on June 30 for Q1, September 30 for Q2, December 31 for Q3, and March 31 for the previous year’s Q4.
An annual compliance report covering the full prior calendar year is due April 30.8California Air Resources Board. Low Carbon Fuel Standard Reporting, Verification and Annual Compliance Calendar That filing reconciles total credits and deficits for the year and demonstrates whether you met your obligation. Entities that traded in the Credit Clearance Market have to submit an amended annual report by August 31.
Third-Party Verification
CARB does not take reported data at face value. Independent verification by accredited verification bodies is required, and individual verifiers on those teams must also hold CARB accreditation personally.9California Air Resources Board. LCFS Verification Verifiers must show they have no conflict of interest with the entity they are auditing.
Beginning with the 2026 reporting year, annual reports generating electric vehicle credits must be independently verified. A full verification cycle typically takes about 90 days and involves risk assessment, data sampling, document review, and sometimes site visits, with a verification opinion submitted to CARB at the end. Verification statements for 2026 operating data are due by August 31, 2027. Build that lead time into your compliance planning.
The Credit Market and Price Cap
LCFS credits are a tradeable commodity. Once CARB issues credits into your electronic account, you can hold them for future compliance or sell them to another party through the LRT-CBTS. Both sides confirm the transaction electronically before the system moves the credits.
Prices move with supply and demand. In March 2026, the average credit transfer price was about $66 per metric ton of CO2 equivalent, with individual trades running roughly $55 to $72.10California Air Resources Board. Weekly LCFS Credit Transfer Activity Reports Those numbers were well below historical highs because the credit surplus from the old targets was still working through the market. The automatic acceleration mechanism is designed to tighten that surplus, and prices could move higher in coming years.
The program includes a safety valve for deficit holders who cannot retire their obligations through normal trading. The Credit Clearance Market opens annually with a maximum credit price, set at $275.39 per metric ton for 2026. The cap comes from a $200 baseline fixed in 2016, adjusted each year by the Consumer Price Index.11California Air Resources Board. LCFS Credit Clearance Market Open-market prices have historically run well below the cap.
Penalties for Noncompliance
CARB enforces the LCFS under California Health and Safety Code Section 38580, which treats AB 32 program violations the same as emissions of air contaminants for penalty purposes. Each day a required report is missing, incomplete, or inaccurate is a separate violation. Each unretired deficit at the end of a compliance period is also a separate day of violation, with a penalty of up to $1,000 per deficit.12California Air Resources Board. Low Carbon Fuel Standard Final Regulation Order For a large importer carrying thousands of deficits, those numbers add up quickly.
Beyond fines, CARB can seek injunctive relief, impose corrective action plans, and require enhanced reporting or auditing. Persistent noncompliance can lead to suspension of pathway certifications and trading privileges, which effectively shuts a company out of the market until it clears its obligations.
How the LCFS Fits with Other Programs
The LCFS runs alongside the federal Renewable Fuel Standard, and a qualifying fuel typically earns both LCFS credits and federal Renewable Identification Numbers because the two programs measure different things: the RFS imposes volumetric blending requirements on refiners, while the LCFS targets carbon intensity regardless of volume. The federal Section 45Z Clean Fuel Production Credit adds a third layer and recognizes CARB LCFS verifiers as qualified certifiers for lifecycle emissions determinations, though IRS rulemaking on 45Z is still developing.
Clean fuel programs now exist in Oregon and Washington, with New Mexico working through rulemaking and several other states considering legislation. Credits do not transfer between state markets, so a producer or importer operating in more than one state has to track each program’s requirements separately.