Current status - 18 July 2026. VM0042 v2.2 is the active methodology and has been approved by the ICVCM as meeting the Core Carbon Principles. Both v2.2 and the older v2.1 remain usable. Verra issued Corrections and Clarifications to v2.2 on 11 June 2026 that all v2.2 projects must apply, and ran a public consultation on a major revision of v2.2 (and of the modeling guidance VMD0053) from 11 February to 31 March 2026. Until a revised version is published, projects continue to use v2.2 with the June 2026 corrections.
VM0042 is Verra's methodology for earning carbon credits by changing how farmland is managed, with the central goal of building soil organic carbon. If a project shifts cropland or grassland to better practices, such as no-till, cover crops, smarter fertilizer use, or rotational grazing, VM0042 sets out how to measure the carbon benefit, how to prove it would not have happened anyway, and how many credits it can claim.
It is a demanding methodology, because soil carbon is hard to measure and easy to lose. A project can implement good practices and still credit very little if the sampling is imprecise, the baseline is weak, or the additionality case does not hold. This guide explains how VM0042 v2.2 works in practice. Any worked numbers are illustrative teaching figures, not forecasts for a real project.
What is VM0042?
VM0042, Improved Agricultural Land Management, is a Verified Carbon Standard (VCS) methodology under Sectoral Scope 14 (Agriculture, Forestry and Other Land Use). It credits both emission reductions and carbon removals that result from improved management of cropland and grassland, tracking carbon dioxide, methane, and nitrous oxide. The defining feature is soil organic carbon (SOC): every VM0042 project must include and monitor SOC, and it can never be treated as negligible.
The unit of credit is the Verified Carbon Unit (VCU), where one VCU represents one tonne of CO2 equivalent that has been independently verified. A project can implement a single practice or stack several together, and stacking is encouraged because the benefits compound.
Every project moves through three stages inside its boundary:
| Stage | What the project must prove |
|---|---|
| 1. Establish the baseline | What management and emissions would have continued without the project |
| 2. Change management | At least one eligible practice change that increases soil carbon or cuts emissions |
| 3. Measure and verify | Soil carbon gains and emission reductions, quantified with stated uncertainty |
VM0042 at a glance
| Element | What VM0042 v2.2 requires |
|---|---|
| Land types | Cropland and grassland (wetlands excluded, with a narrow exception for flooded rice) |
| Eligible practices | At least one of five categories: fertilizer, water, tillage and residue, cropping, or grazing |
| Mandatory carbon pool | Soil organic carbon, to a minimum depth of 30 cm |
| Gases | CO2, CH4, N2O |
| Quantification | One of three approaches: measure-and-model, re-measurement, or default factors |
| Additionality | Verra tool VT0008 (regulatory surplus, barriers or investment, and common practice) |
| Uncertainty | Credits are deducted as measurement uncertainty rises |
| Permanence | AFOLU non-permanence buffer pool, applied to removals only |
| Credit type | Both emission reductions and carbon removals |
The five eligible practices
A VM0042 project must introduce a genuine management change in at least one of five categories. A quantitative change generally has to exceed 5% of the pre-existing value to count as a real improvement.
| Category | Typical practices | Main benefit |
|---|---|---|
| Fertilizer management | Reduced synthetic nitrogen, enhanced-efficiency fertilizers, organic substitution, nitrification inhibitors | Lower N2O, higher SOC |
| Water management | Alternate wetting and drying in rice, shifting from flood to drip or furrow irrigation | Lower CH4 in rice, higher SOC |
| Tillage and residue | No-till or reduced till, retaining residues instead of burning | Higher SOC, lower N2O |
| Cropping practices | Cover crops, agroforestry, diversified rotations, improved perennial species | Higher SOC and removals |
| Grazing practices | Rotational or adaptive grazing, reduced stocking density, seasonal rest | Higher SOC, lower CH4 |
Alternate wetting and drying in rice is one of the highest-impact single practices, because draining a flooded paddy interrupts methane production and can cut rice methane substantially. Tillage and cropping changes are the most common in current cropland projects. Many real projects combine practices into recognizable stacks, such as conservation agriculture (no-till plus cover crops plus residue retention) or regenerative ranching (rotational grazing plus improved grasses plus reduced synthetic nitrogen).
Eligibility: what qualifies and what is excluded
Beyond implementing an eligible practice, a project has to clear several conditions. The land must be cropland or grassland at the start and stay in agricultural use. There is a narrow allowance for a one-time conversion of land that was demonstrably degraded in the baseline.
Four situations make a project ineligible:
- The project area was cleared of a native ecosystem within the 10 years before the project start.
- The project is expected to cause a sustained drop in agricultural productivity greater than 5%, which would simply push production, and its emissions, elsewhere.
- Biochar is the only practice, because biochar has its own methodology, VM0044. Biochar can still be used alongside VM0042 practices, with its carbon subtracted from the soil carbon claim.
- The activity takes place on wetlands, apart from the flooded-rice exception where wetland hydrology is not affected.
Establishing the baseline requires a look-back over the project's recent history, generally at least three years and covering at least one full crop rotation, documented as a schedule of past practices.
The three quantification approaches
This is the decision that shapes a project's cost, precision, and credit yield. VM0042 offers three approaches, and the same approach must be used for the baseline and project within a given quantification unit, though different units can use different approaches.
| Approach | How it works | Covers | Trade-off |
|---|---|---|---|
| 1. Measure and model | A peer-reviewed biogeochemical model (such as DayCent or RothC), calibrated with soil and flux measurements | SOC, plus CH4 and N2O | Highest precision and lowest uncertainty deduction, but high cost and expert review |
| 2. Re-measurement | Direct SOC measurement at project and control sites, repeated over time | SOC only | Robust for soil carbon, but other gases still need default factors, and it needs control sites |
| 3. Default factors | IPCC emission and stock-change factors | Fossil fuels, liming, CH4, N2O, and SOC | Lowest cost, but largest uncertainty deduction |
Approach 1 requires the model to be publicly available, peer-reviewed, and validated for the project's conditions under Verra's modeling guidance (VMD0053), plus review by an independent modeling expert. It tends to suit large projects. Approach 2 needs a minimum of three control sites located within 250 km of the linked project areas, and it credits soil carbon only, so emissions from other gases still fall back on Approach 3 factors. Approach 3 is the most accessible for smallholder programs but pays for that accessibility with the steepest uncertainty discount.
How soil carbon is measured
Soil organic carbon stock is the product of carbon concentration, bulk density, and depth. For a layer of soil:
SOC stock (tC/ha) = organic carbon concentration (g/kg) × bulk density (g/cm3) × depth (cm) × 0.1
As an illustration only, soil at 18 g/kg carbon, a bulk density of 1.35, and 30 cm depth holds about 72.9 tC/ha, which is roughly 267 tCO2e/ha once multiplied by 44/12. That figure is a teaching example, not a project value.
Several rules keep the measurement honest. Sampling must be stratified (grouping the land by soil, slope, and management so like is compared with like) and repeated at the same locations and in the same season each time. Depth is at least 30 cm, with 50 cm recommended. Crucially, VM0042 requires an equivalent soil mass correction: because practices like no-till slightly change bulk density, comparing a fixed depth over time can create a false gain or loss, so SOC change is reported on an equal-mass basis instead. Coarse fragments larger than 2 mm are excluded because they hold essentially no organic carbon, and dry combustion in an accredited laboratory is the reference measurement method. Soil is typically re-measured at each monitoring event, usually every five years, while activity data is collected annually.
Additionality, baseline, and leakage
Baseline. The baseline is the continuation of the farm's pre-project practices, documented from historical records where possible and from weaker evidence, down to farmer attestation or regional averages, only where better records do not exist. Where a choice of values exists, the methodology requires the conservative one, meaning the value that produces fewer credits. Baselines are reassessed periodically, generally every 10 years.
Additionality. VM0042 v2.2 uses Verra's additionality tool VT0008. A project must show regulatory surplus (the practice is not legally required), clear a barrier or investment test (the practice faces real financial, technological, or institutional barriers that carbon revenue helps overcome), and pass a common-practice test, which generally means the improved practice is adopted on less than 20% of comparable land in the region.
Leakage. Leakage is emissions that rise outside the project because of it. VM0042 assesses several types, including diverting manure or compost that was already being used elsewhere, displacing livestock onto other land, production declines that shift farming to new land, and residues that were previously used for fuel or feed. Cropland no-till projects often have minor leakage, while grazing and organic-amendment projects need careful documentation.
Uncertainty, removals, and the buffer pool
Two deductions stand between gross carbon benefit and issued credits, and understanding them is the difference between a realistic forecast and a disappointing one.
Uncertainty deduction. Because every VCU must represent a real tonne, VM0042 discounts credits as measurement uncertainty grows. Sampling error is usually the largest contributor, and imprecise sampling is punished directly: the wider the confidence interval around the measured soil-carbon change, the larger the share of credits withheld. Sparse sampling across a large, variable area is the classic way projects lose credits they thought they had earned.
Reductions versus removals. VM0042 separates the two, because they are treated differently for permanence. Emission reductions (avoided fossil fuel, liming, methane, and nitrous oxide) are considered permanent and carry no buffer deduction. Carbon removals (the soil carbon built up above baseline) are reversible, since carbon in soil can be released again if a farmer ploughs a no-till field or abandons the practice.
The buffer pool. To insure against that reversal, VM0042 uses the AFOLU non-permanence buffer pool. A share of every removal issuance is deposited as non-tradeable buffer credits, set by Verra's AFOLU Non-Permanence Risk Tool and subject to a minimum floor. If an unintentional reversal occurs, such as drought or fire, the buffer covers the loss and buyers are protected. An intentional reversal by the project is not covered and must be replaced. This buffer pool is a key contrast with biochar under VM0044, which treats reversal risk as negligible and applies no such deduction.
The order of operations matters: gross benefit, then the uncertainty deduction, then split into removals and reductions, then apply the buffer to removals only. The credits issued are the reductions plus the buffered removals.
What you monitor
VM0042 monitoring runs on two clocks. Activity data (fertilizer applied, tillage dates, irrigation, crop and livestock records, and the indicators needed to check leakage) is collected annually. Soil carbon stock change is measured per monitoring event, typically every five years, and under Approach 1 that measurement is also used to true up the model against reality and recalibrate it if it has been over-predicting.
Quality control is explicit at both the field and laboratory level, including GPS records for every plot, chain of custody for samples, duplicate sampling, and accredited-laboratory standards. Verification by an independent body is required at least every five years. An incomplete monitoring plan, or sampling that cannot support the claimed precision, is one of the most common reasons projects issue fewer credits than expected.
Primary sources
- VM0042 Improved Agricultural Land Management, v2.2 - active methodology page
- ICVCM approval of Verra's agricultural land management methodology under the Core Carbon Principles
- Verra AFOLU Non-Permanence Risk Tool
- VT0008 Tool for Demonstrating Additionality of Agricultural Land Management Activities
FAQ
What is VM0042?
VM0042 is Verra's Verified Carbon Standard methodology for Improved Agricultural Land Management. It credits emission reductions and carbon removals from managing cropland and grassland better, above all by increasing soil organic carbon. Version 2.2 is the active version and is approved by the ICVCM under the Core Carbon Principles.
What practices are eligible under VM0042?
A project must adopt at least one change across five categories: fertilizer management, water management, tillage and residue management, cropping practices, and grazing practices. Examples include no-till, cover crops, alternate wetting and drying in rice, reduced synthetic nitrogen, and rotational grazing. A quantitative change generally must exceed 5% of the prior value to count.
What are the three VM0042 quantification approaches?
The three approaches are measure-and-model (a validated biogeochemical model calibrated with measurements), re-measurement (direct soil carbon sampling at project and control sites), and default factors (IPCC emission and stock-change factors). Higher-precision approaches earn a smaller uncertainty deduction but cost more. The same approach must be used for baseline and project within a quantification unit.
How deep does VM0042 require soil carbon sampling?
Soil organic carbon must be measured to a minimum depth of 30 cm, with 50 cm recommended. Sampling must be stratified and repeated at the same locations and season, and VM0042 requires an equivalent soil mass correction so that changes in bulk density do not create false gains or losses.
Does VM0042 use a buffer pool?
Yes. VM0042 is an AFOLU methodology, so carbon removals contribute a share of credits to the AFOLU non-permanence buffer pool, set by Verra's risk tool and subject to a minimum floor. The buffer covers unintentional reversals such as drought or fire. Emission reductions are treated as permanent and carry no buffer. This is a key difference from biochar under VM0044.
How does VM0042 prove additionality?
VM0042 v2.2 uses Verra's VT0008 tool. A project must show regulatory surplus, pass a barrier or investment analysis showing carbon revenue is needed to overcome real obstacles, and pass a common-practice test, which generally means the improved practice is used on less than 20% of comparable regional land.
What is the difference between VM0042 and VM0044?
VM0042 credits soil organic carbon from improved farmland management and uses a buffer pool for its reversible removals. VM0044 credits carbon stored in biochar and treats reversal risk as negligible, so it uses no buffer. A project can combine both, applying VM0044 for biochar and VM0042 for other practices, with the biochar carbon excluded from the soil carbon claim.
What version of VM0042 is current?
VM0042 v2.2 is the active version, and Verra issued Corrections and Clarifications to it on 11 June 2026 that all v2.2 projects must apply. Version 2.1 also remains usable. A major revision was out for public consultation in early 2026 but has not replaced v2.2. Always confirm the latest version and corrections on Verra's registry before designing a project.