Carbon accounting software RFP checklist with a weighted scoring template and twelve vendor questions

The short answer: a carbon accounting software RFP should score five things and ignore most of the rest: whether the vendor builds the inventory from your own ledger or purchase data, whether every figure links back to a source line, which emission factors it uses and who maintains them, what the first-year total cost is including services, and whether the same data can feed the report that triggered the purchase (SB 253, CDP, CSRD or a customer request). The checklist and scoring table below put numbers on each.

This is for a finance, procurement or sustainability lead who has two to five vendors on a shortlist and a deadline. It assumes you are buying for a US company, so US EPA factors and California rules matter more than European frameworks. Published prices quoted here come from the vendors or from our own carbon accounting software cost page.

What should a carbon accounting software RFP include?

Keep it to one page of requirements and one page of questions. Long RFPs mostly reward the vendor that is best at writing RFP answers. Start with the trigger, because it sets the quality bar: a customer questionnaire can live with an estimate, while a regulator, lender or assurance provider will test individual figures. State your reporting year, number of legal entities, number of sites, your ERP or accounting system and the deliverable you need on a date. Then ask each vendor to show, on a sample of your own data, how a tonne of CO2e traces back to a transaction.

The weighted scoring table

The weights below are a starting point for a company whose number will be checked by someone outside the building. Move them to suit you, but write them down before the demos so the best presenter does not win by default.

A worked example shows how the arithmetic can change a shortlist. Say vendor A is a dashboard-first platform and vendor B classifies your ledger export. A scores 2 on evidence trail, 3 on intake, 4 on factors, 4 on framework fit, 2 on cost and 3 on repeatability. B scores 5, 5, 4, 3, 5 and 4. With the weights above, A comes to 0.25x2 + 0.20x3 + 0.15x4 + 0.15x4 + 0.15x2 + 0.10x3 = 2.9 out of 5, and B to 4.45. The point is not these particular scores, which are illustrative. It is that cost and polish carry less weight than whether the number survives a question.

Twelve questions to put to every vendor

1. Show me one tonne traced to its source line. Use your own data, not their demo company.
2. Which emission factor set and version do you use for US electricity, fuel and spend? The EPA publishes the reference set in its GHG Emission Factors Hub, so any answer can be checked.
3. How do you handle lines you are unsure about? Good tools flag them for review. Weak ones guess and move on.
4. Which of the 15 Scope 3 categories are covered, and by which method? The categories are defined in the GHG Protocol Scope 3 Standard. See also our category guide.
5. What does year one cost in total? License, onboarding, data connectors, support tier and any consultant hours.
6. What is in the price and what is an add-on? Extra users, entities, framework reports and supplier portals are the usual surprises.
7. What do we need to hand over, and in what format? A vendor that asks for an export you can produce this week is faster than one that needs an integration.
8. How long from signed order to a first inventory? Ask for the number from a comparable customer, not the best case.
9. Can the same data produce our SB 253, CDP or customer report? If a regulation is the trigger, see SB 253 reporting software for what the filing needs.
10. What does an auditor receive? Ask for a sample export of line-level evidence and the stored reasoning.
11. What happens to our data if we leave? You should be able to export the inventory and the mapping.
12. Who maintains the product and factors, and how do updates reach us? Factors change every year.

Red flags that should cost a vendor points

A price that appears only after a discovery call is not a red flag by itself, since enterprise vendors often price by scope. It becomes one when no ballpark is offered at all and the first number is six figures. Other warning signs are a demo that never leaves a sample company, an emissions total with no drill-down, references only from other industries, and an implementation plan that needs your IT team for weeks before any result. If the work needs a custom export from an old system and you have nobody to build it, plan for someone who can hire a contract developer for the export rather than letting the vendor's services quote set the scope.

How the usual shortlists compare on cost and effort

The differences between these routes are covered in carbon accounting services vs software, and a broader vendor list is on best carbon accounting software. Whichever you pick, run the same twelve questions against all of them.

How to run the evaluation in two weeks

Week one: send the one-page requirement and the question list, and give every vendor the same anonymized ledger export. Week two: hold demos on that data, score the table the same day, and ask your top two for a written first-year total. A short pilot on one entity beats a long reference check, because it tests intake, classification and the evidence trail in the only place that matters, your own books.

Frequently asked questions

How do I compare carbon accounting software vendors?

Score every vendor on the same weighted criteria using the same sample of your own data: evidence trail, data intake, emission factors, framework fit, first-year cost and repeatability. Weight evidence highest if anyone outside your company will check the figures.

How long does carbon accounting software implementation take?

It depends on the route. Enterprise platforms with connectors commonly take weeks to months. An export and classify tool can produce a first inventory from a ledger file in a day, with review of flagged lines after. Ask each vendor for a timeline from a comparable customer.

What does carbon accounting software cost in the first year?

Published prices run from $2,340 a year for a ledger-based tool to $55,000 a year and up for enterprise platforms, before services. Add onboarding, connectors, extra entities and consultants to get the real first-year total, and ask each vendor to write it down.

To see how your own export would be classified, see how it works or review the published plans.