23 January 2026
The Best Carbon Accounting Software for Mid-Sized and Large Corporates
Looking for carbon accounting software your finance team trusts, your auditors won't tear apart, and your board feels confident signing off on? Here's what to look for.
Carbon Accounting Has Changed
Carbon accounting used to sit on the edges of the business. A spreadsheet. A consultant once a year. With ASRS S2, IFRS S2, and increasing audit scrutiny, carbon data is now treated much more like financial data.
Built by an Ex-PwC Auditor
Sumday was built by an ex-PwC auditor who had seen firsthand how carbon reporting breaks down under real audit conditions. Everything in the platform is designed with one question in mind: Could this stand up in an audit?
Why Mid-Sized and Large Businesses Choose Sumday
It starts with your financial data. Sumday imports your actual financial transactions, and emissions are calculated from real spend and activity data. Every emissions number can be traced back to the source transaction, the methodology used, and the emission factor applied.