An invoice checked against earlier entries
A supplier invoice arrives in a shared inbox. A tool reads the fields, and an agent flags a duplicate, a wrong amount or missing GST. He reads and approves. The anomaly setup took about 20 minutes. He does not let the model file BAS or pay.
Done with Valgfri agentModerate
This is a public report, not advice from Skatteetaten, NAV, Altinn or an accountant. Check figures, deadlines and decisions against the original.
What was done
On 21 April 2026 u/DowntownInspection writes in r/ukaccounting that he has tried a tool for invoice capture, a chat assistant for invoices and nexos.ai between them. A supplier invoice arrives in a shared inbox. The tool reads the details. An agent checks against earlier entries and flags a duplicate, a wrong amount or missing GST. If it looks right, he reads and approves. Recurring expenses are coded on their own. The monthly check flags unusual changes or a missing payment. A client invoice can be drafted from earlier invoices. n8n and Zapier were enough for simple things, such as saving an attachment or sending Slack when a payment is overdue. When he wanted a comparison with earlier months, he moved to nexos.ai, where he can describe the flow and switch among GPT, Claude, Gemini and other models. The anomaly agent took about 20 minutes to set up and sends a weekly summary. He will not let a model file BAS, file a tax return or approve a payment without him looking.
How it went
He approves the invoice himself when the agent does not flag it. A weekly anomaly summary is what he describes. The post does not say how many invoices have gone through.
Worth knowing
Time saved is not given as a number beyond the about 20 minutes of setup. No client is named. n8n is only the simple rules he left. Check the original. This is not advice on BAS, tax or payment.
How to do it
- Let the invoice be read from the inbox and shown against earlier entries.
- Look at duplicates, the amount and GST before you approve.
- Do not file BAS, do not file a tax return and do not pay before you have said yes.
Try it with Valgfri agent
Read the invoice in [inbox] and compare it with [earlier entries]. Flag a duplicate, a wrong amount or missing [tax]. Do not approve a payment and do not file anything until I say yes.
Replace text in brackets with your own.
Done when. You have seen the flag, and no payment has been approved and nothing has been filed without a yes.
Safety rule. The agent does not approve a payment and does not file BAS or a tax return. You say yes first.
Read the original
Read the original · u/DowntownInspection on Reddit ·