CDP reporting software for the 2026 CDP questionnaire: Scope 1, 2 and 3 data

Last updated July 2026. CDP is where a large share of US companies first meet a formal emissions disclosure, usually because a customer or an investor asked them to respond rather than because a law did. The questionnaire itself is not the hard part. The hard part is that the emissions section wants a complete Scope 1, 2 and 3 inventory with methods, boundaries, emission factors and data quality all stated, and most companies start assembling that six weeks before the deadline from spreadsheets nobody owns. Our carbon accounting software attacks the input side: it classifies your accounts payable and utility data into a scope-by-scope inventory and keeps each figure linked to the invoice behind it, so the number you type into CDP has something underneath it.

CDP runs one annual cycle, and the date that matters is the scoring deadline, not the final one. A response filed after the scoring deadline still lands on your public record, but it does not receive a score, which is usually the whole reason a customer or investor asked you to disclose. If you are reading this in late July 2026, you have roughly eight weeks.

A lot of tools sold as CDP software are really form-fillers: they hold your answers, track who wrote what, and export a submission. That is useful for the governance and strategy modules, where the answer is a narrative your sustainability and legal teams write once and refine each year. It does nothing for the module that carries the most scoring weight, which is the emissions data itself. The questions there are quantitative and unforgiving: gross global Scope 1 in metric tonnes CO2e, Scope 2 reported both location-based and market-based, Scope 3 broken out by the fifteen categories with a relevance and calculation-method statement for each, plus your base year, your consolidation approach and the emission factor sources you used.

Every one of those is a property of how the inventory was built, and none of them can be rescued by better project management in September. That is the case for treating CDP as a data problem you solve once, then report from, rather than an annual writing exercise. The same inventory feeds SB 253, customer questionnaires and investor requests without being rebuilt each time.

The spend screen in step three is the step that unlocks the schedule, because it converts an open-ended supplier-data project into a bounded classification job. Our guide to calculating Scope 3 from spend covers the mechanics, Scope 3 materiality assessment covers how to justify which categories you deepened, and location-based vs market-based Scope 2 covers the dual reporting CDP requires.

CDP reporting is the annual process of answering CDP's environmental disclosure questionnaire, which covers climate change, forests and water security, and having the response scored and published. CDP is a not-for-profit that runs the disclosure system on behalf of requesting investors and corporate customers. Companies respond because someone in their capital or customer chain asked them to, and the response becomes part of the public record that buyers, lenders and rating agencies consult. In 2026 there are three questionnaire types: the full corporate questionnaire for large and mid-sized companies, a dedicated SME questionnaire, and a separate one for cities, states and regions.

No, CDP disclosure is voluntary in the legal sense. It becomes effectively mandatory through commercial pressure: an investor holding your stock or a large customer running a supplier program requests your response, and declining is visible, because non-response is recorded. That is a different obligation from a law like California SB 253, which compels reporting by statute for companies over $1 billion in revenue doing business in the state. The two overlap heavily in substance, since both want a GHG Protocol inventory, so companies facing both should build one inventory and report it twice rather than run parallel projects. Our climate disclosure software overview maps which regimes catch which companies.

There are two separate costs and they are often confused. CDP charges an administration fee that companies and SMEs must pay before submitting, with the amount depending on the questionnaire type and published by CDP each cycle; cities, states and regions are exempt from it. That fee is usually the smaller number. The real cost is the internal and consultant time spent assembling the inventory, which for a first response commonly runs into hundreds of hours across finance, facilities, procurement and sustainability. That is the cost software can actually move, by removing the manual classification of thousands of ledger lines and by making year two a refresh instead of a repeat. Check the current fee schedule with CDP directly, since it is set per cycle.

The 2026 questionnaire is close to the 2025 one in structure, so a prior response is still a good starting point, with targeted expansions rather than a rewrite. Ocean appears as a new environmental theme, added as response options across existing modules rather than a standalone module, and it is optional and unscored this cycle. Risk and resilience questions expanded across all three questionnaires, with more asked about adaptation to physical climate risk. The forests module added coffee, cocoa and rubber as scored commodities, and water security added detail on wastewater and regulatory compliance. Alignment was strengthened with the TNFD recommendations, the GRI 303 water standard and the GHG Protocol Land Sector and Removals Guidance. For SMEs, the questionnaire grew from eight modules to ten with new unscored forests and water modules, and the A List opened to SMEs for climate change. Scoring in 2026 still covers three themes: climate change, forests and water security, with ocean and plastics unscored.

CDP scores each theme on a band from A down to D-, and a company that was requested to disclose but did not respond is recorded as F. The bands map to four sequential levels: disclosure, meaning you answered; awareness, meaning you have assessed how environmental issues affect your business; management, meaning you are acting on them; and leadership, meaning you demonstrate best practice. You have to clear each level to be assessed at the next, which is why completeness matters more than eloquence. A response with unexplained gaps in the emissions module stalls at disclosure regardless of how strong the strategy narrative is. The published scoring methodology tells you exactly which questions carry points, so it is worth reading before you write anything.

For the wider reporting picture, see climate disclosure software for the US regulatory map, ESG reporting software for the broader category, and Scope 3 emissions reporting for the hardest part of any CDP response. If a statutory deadline is your real trigger, SB 253 reporting software covers California in full. To compare vendors, see best carbon accounting software. The GHG inventory checklist is the step-by-step build, and the CDP 2026 deadline guide turns the timeline above into a week-by-week plan.