Your bookkeeping is already a carbon report
Most of the data you need for your first carbon footprint is already in your books.
Many small businesses think measuring their carbon footprint means starting a new project from scratch. It usually doesn’t. For most office and service companies, the data is already in your accounting software: purchase invoices, travel expenses and energy bills.
Why does a small business need its carbon footprint?
Mandatory EU sustainability reporting now only covers the largest companies, those with more than 1,000 employees and over €450 million in turnover. We explain the change in more detail in our article EU simplified sustainability reporting. What does it mean for you?
But these companies still have to report emissions across their whole value chain, so they ask their partners for data. They usually want to know your emissions, energy use, business travel and reduction plans. Banks and insurers are asking for the same information more often, too.
These questionnaires often come with short deadlines, and the wording changes a little every time. If your data isn’t ready, one request can turn into days of checking invoices and building spreadsheets.
There’s some relief, too. Since 18 March 2026, large companies can’t ask partners with up to 1,000 employees for more than the EU’s voluntary reporting standard requires. You can say no to anything beyond it. We’ll walk you through that standard, VS, in December.
Where do your company’s emissions come from?
The GHG Protocol is the most widely used carbon accounting framework. It splits emissions into three groups:
- Direct emissions (Scope 1): from sources you own or control, such as company cars.
- Energy emissions (Scope 2): from the electricity, heating and cooling you buy.
- Value chain emissions (Scope 3): everything else, such as the goods and services you buy and business travel.
For office and service businesses, Scope 3 is usually by far the biggest. Here at Finago, Scope 3 makes up 99.5% of our emissions, because we have no production or vehicle fleet of our own. And most of your Scope 3 purchases already show up on your invoices.
How does accounting data become a carbon estimate?
The simplest approach is the spend-based method. You take what you spent in each purchase category and multiply it by that category’s average emission factor, measured in kilograms of CO₂ equivalent per euro (kg CO₂e/€). For example, you multiply what you spent on IT equipment by an average factor for electronics.
The result is an estimate, not an exact measurement. The GHG Protocol treats spend-based figures as a starting point that you replace with more precise data whenever you have it. Energy is the easiest place to start. Your bills already show kilowatt hours, and they give you a more accurate figure than euros.
Three steps to your first carbon footprint
- Tidy up your categories. Consistent purchase and expense categories make your calculation more accurate and your books clearer.
- Start with the big three. Goods and services you buy, energy and business travel usually explain most of your emissions.
- Measure once, use it everywhere. Once you’ve calculated your footprint, you can reuse the same figures for customer questionnaires, loan applications and your own cost reviews. No more rebuilding the numbers every time.
How Procountor helps
We’ve built Procountor’s carbon footprint calculation together with our partner Carbonlink. It estimates the footprint of the goods and services you buy from the financial data already in Procountor, so you don’t have to collect anything separately. You get a regular report that shows how your emissions change over time.
The more detailed your bookkeeping, the better your estimate. The Procountor mobile app suggests an expense type for every receipt, which keeps your categories consistent.
There’s a cost angle too. Energy and travel cost money, and what you measure, you can reduce.
Clean books and credible carbon data come from the same place.
Sources:
GHG Protocol Corporate Accounting and Reporting Standard (WRI/WBCSD): Scopes 1, 2 and 3.
GHG Protocol: Technical Guidance for Calculating Scope 3 Emissions, Category 1: spend-based method.
Omnibus I Directive (EU) 2026/470 amending the CSRD (published 26 February 2026, in force from 18 March 2026): value chain cap.
Finago Sustainability Highlights 2025.