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Invoice coding with context: how the workflow works
Short answer
AI invoice coding proposes an account and a cost centre only when it has a basis: an earlier entry for the same supplier and the same type of cost, or an order. An invoice without a basis goes to the accountant, who makes the decision. At Syntalith the automation costs from €3,000 net, and at 1,000 cost invoices a month of 3 minutes each it pays back in 2.3 months.
How we workDetails ↓
- 01Call30 minutes with an engineer, free
- 02PrototypeA working system on your process and data, free
- 03ImplementationTarget and fixed price in the contract; 50% at signing
- 04Acceptance50% once the agreed target is met
- net for the automation of one process, build paid once
- from €3,000
- from signing the contract to acceptance
- 2–6 weeks
- free prototype on your cases
- €0
We belong to the OpenAI and Anthropic partner programmes and learn through their official courses. What this means ↓
Author: Syntalith · 3 min read
Statistics
Invoices and AI: statistics 2026
2.3 mo.
payback of a €3,000 automation at 1,000 cost invoices a month: €1,745 of work today, €444 with checking and the model. Scenario.
72
According to a Syntalith demonstrator (2026), the archived run of 2 August 2026 covered 12 synthetic invoices and 72 fields, and the rebuilt accountant's workstation shows 976 synthetic invoices.
Source: Syntalith, cost invoice coding demonstrator (2026) ↗
18 bn
According to the European Commission (2023), around 18 billion invoices are issued in the EU every year.
Source: European Commission, proposal COM(2023) 533 on late payment (2023) ↗
−87%
According to Anthropic (2025), AI cuts the time of tasks on invoices, memos and other documents by an estimated 87%.
Source: Anthropic, Estimating AI productivity gains (2025) ↗
14–56%
According to Anthropic (2025), studies with a control group found smaller time savings, from 14% to 56%.
Source: Anthropic, Estimating AI productivity gains (2025) ↗
Figures checked: 22 October 2026
Same supplier, different expense: which account?
The invoice looks familiar, but it concerns another department. The supplier is the usual one, the amount and the tax ID are legible, and the cost is for training where it is usually for servicing. Reading the amount and the tax ID is not enough to assign an account and a cost centre. The accountant needs a basis: which earlier invoice the system judged similar, and why.
In our demonstrator, the model's answer follows a fixed schema that separates reading the document from proposing the entry. The amount and the number can be legible while there is no basis for choosing an account. Then the gap stays a gap and sends the document for review. In the rebuilt workstation, the accountant filters 976 synthetic invoices, opens a document, checks the basis of the proposal, changes the account and the cost centre and records the reason. The demonstrator does not post anything.
- 01Documentthe fields read, next to the invoice
- 02Proposalan account and a cost centre with the earlier entry or the order cited
- 03No basisthe document goes for review without a proposal
- 04Decisionthe accountant approves, changes and records the reason
- The archived run of 2 August 2026: 12 synthetic invoices and 72 fields
- Supplier and invoice data are synthetic
- No integration with KSeF, the Polish e-invoicing system, or with the general ledger
- Quality on real documents needs a separate trial
What AI invoice coding costs and when it pays back
- Today
- 1,000 cost invoices × 3 min = 50 h (€1,745)
- With the system, a person checks the output in 25% of the time
- €436
- Model, 1 call per case, Claude Sonnet 5.5
- €8.03
- Cost of one case
- €1.75 today, €0.44 with the system
- Saving
- €1,301 a month
Payback of €3,000
2.3 months
The volume, the time and the checking share are the scenario's assumptions. €34.90 an hour is the EU average hourly labour cost for 2025 according to Eurostat. Model: 3,000 input tokens and 300 output tokens per call at Anthropic's rates, converted at the ECB rate of 1.1205 USD per euro on 22 October 2026.
The count covers the work around a case: searching, reading, writing and passing things on. What stays is the time to check the result, 25% of today's work in this scenario. Before the quote we measure both times on 20 to 100 cases the team has already handled, in a free test that takes 5 working days.
In invoice coding, the most expensive item is a proposal approved without reading. That is why the trial counts separately the proposals with a basis that the accountant accepted, the corrected proposals and the invoices where the system rightly proposed nothing.
Before saving to the finance system
A result on twelve synthetic invoices shows the mechanism, but it does not forecast a company's monthly flow. Before integration, settle the version of the chart of accounts, who owns the rules and how a second arrival of the same document is handled. The conditions for an entry in the books under accounting law are described in the post on AI invoice coding from proposal to ledger.
Regular suppliers, one way of booking
coding rules in the system
configuration
Proposals for approval, with a basis
automation of entry proposals
from €3,000
Saving to the finance system without retyping
integration with workflow control
priced after the analysis
A first trial in the business
The first trial covers one category of costs: the accountant judges the proposals alongside the current workflow, before any integration is built. To prepare: the chart of accounts and cost centres, and approved earlier entries. We build this kind of system as part of our AI automations. For the free analysis, a description of one case from the last few weeks and the tools it went through is enough. You do not need to send confidential documents, and you get a written plan within 2 working days.
Worked example · Scenario
How we count the payback: cost invoices
We run the same count for your invoices in the free analysis.
€1,745
a month for coding 1,000 cost invoices by hand
Payback: 2 mo.
3 minutes per invoice and checking in 15% of the old time are our assumptions. €34.90 an hour is the EU average hourly labour cost for 2025 according to Eurostat, for companies with 10 or more employees. We measured the model cost of €0.004 per invoice in our invoice coding system, converted at the ECB rate of 1.1205 USD per euro on 22 October 2026.
See the full calculation →