Fortnox + ChatGPTAsk Fortnox
right inside ChatGPT.
Nordsynk connects ChatGPT to your Fortnox company. You ask in plain language and get answers from your own invoices, vouchers and reports.
A Fortnox administrator activates Nordsynk. After that you connect from ChatGPT yourself.
Example · sample figures
Compare revenue for Q1 against Q1 last year.
Tool call · Nordsynk · Fortnox income statement
Revenue · first quarter
What you can ask ChatGPT about your Fortnox data
Write the way you talk. ChatGPT fetches the right records from Fortnox through Nordsynk. A question that only reads data is answered straight away.
› Show receivables over 30 days, grouped by customer
Read› How many invoices did we send last month?
Read› Which supplier invoices fall due this week?
Read› Compare revenue for Q1 against Q1 last year
Read› Create a customer invoice for Nordvik AB, 12 hours at 950 SEK
Change · needs approval› Create a voucher for a receipt of 480 SEK, office supplies
Change · needs approval
Answers are based on what your Fortnox permissions give you access to. ChatGPT can be wrong, so check any figure you are going to act on.
From question to change in Fortnox
Ask ChatGPT to create a customer invoice or a voucher. Nordsynk prepares the change and opens a preview in your browser, where you see every field before anything is saved.
Nothing changes in Fortnox until you approve it.
ChatGPT also asks permission the first time it uses Nordsynk: choose Allow once or Always allow. Approval in Nordsynk is a separate step, whatever you choose there.
Example · sample customer invoice
Preview · Fortnox
Create customer invoice, 14,250.00 SEK
Requested via ChatGPT · Acme AB
| Field | In Fortnox now | After approval |
|---|---|---|
| Customer | In Fortnox now— | After approvalNordvik AB |
| Line | In Fortnox now— | After approvalConsulting hours, 12 h × 950.00 SEK |
| Total excl. VAT | In Fortnox now— | After approval11,400.00 SEK |
| VAT 25% | In Fortnox now— | After approval2,850.00 SEK |
| Amount due | In Fortnox now— | After approval14,250.00 SEK |
Applies only to exactly this change. If anything changes, Nordsynk asks again.
How to connect Fortnox to ChatGPT
An administrator activates Nordsynk once. After that, each user connects from their own ChatGPT settings.
- 01
Activate Nordsynk in Fortnox
An administrator opens the Fortnox integration marketplace, activates Nordsynk and assigns a Nordsynk seat to your Fortnox user. It takes under a minute.
- 02
Add Nordsynk as a custom MCP server
In ChatGPT, open Customize → Plugins, choose Add and then Create custom MCP server. Enter the address as Server URL, keep OAuth as the authentication, confirm the risk notice and choose Create as a plugin.
- 03
Sign in to Nordsynk
ChatGPT opens the Nordsynk sign-in. Sign in with your email and approve all or a selection of your connected companies. Then ask your question in the chat.
Can't find Create custom MCP server? ChatGPT's menus differ between plans and workspaces. Read the setup guide or contact support.
Values to enter in ChatGPT
Create custom MCP server
Name
Fortnox via Nordsynk
Connection
Server URLTunnelhttps://mcp.nordsynk.se/mcp
Authentication
OAuth
Custom MCP servers introduce risk.
I understand and want to continue
Video guide · 3:29
Connect ChatGPT to Fortnox – step by step
Narrated in Swedish with English subtitles. The video plays from YouTube when you click.
Ask Nordsynk or build an automation?
Zapier and Make are built for flows that should run the same way every time. Nordsynk is for questions and changes you phrase when you need them.
Nordsynk in ChatGPT
Automation such as Zapier or Make
Starts when
Starts when
Nordsynk in ChatGPT
You ask a question
Automation such as Zapier or Make
An event happens, such as a new invoice
Fits
Fits
Nordsynk in ChatGPT
New questions, analysis and one-off changes
Automation such as Zapier or Make
Recurring flows that should run on their own
Changes in Fortnox
Changes in Fortnox
Nordsynk in ChatGPT
You review and approve each change
Automation such as Zapier or Make
You set the rules in advance
The description of Zapier and Make is a general characterisation, not a feature comparison. If you need a flow that runs without anyone asking, an automation is the right tool.
You control what ChatGPT can reach
The same permissions as in Fortnox
Nordsynk connects to Fortnox with your own Fortnox account. ChatGPT can only reach what you have permission to in Fortnox and the areas the company's access policy allows.
You choose the companies
When you sign in, you approve all or a selection of your connected companies. ChatGPT can only use the companies you have approved.
Your data
ChatGPT receives the records needed to answer the question. Read the privacy notice about what Nordsynk stores, and OpenAI's privacy policy on how ChatGPT handles conversations.
Price per Fortnox company and user
Nordsynk costs 199 SEK per Fortnox company per user per month through the Fortnox integration marketplace.
You need your own seat in each Fortnox company where you use Nordsynk. One licence never covers several companies. The cost of your ChatGPT plan is extra and is paid to OpenAI.
Example · sample companies
Per month via Fortnox
Frequently asked questions about Fortnox and ChatGPT
Can you connect ChatGPT to Fortnox?
Yes. With Nordsynk you add a custom MCP server in ChatGPT and sign in to Nordsynk with your email. Then you choose companies and can ask questions right in the chat. An administrator first activates Nordsynk in the Fortnox integration marketplace.
Can you chat with Fortnox?
With Nordsynk you can use ChatGPT, Claude or Cursor as a chat interface to your Fortnox data. You ask in plain language and Nordsynk fetches the records from Fortnox for you.
Can ChatGPT do bookkeeping in Fortnox?
ChatGPT can prepare a voucher or an invoice through Nordsynk, but nothing is saved in Fortnox until you approve the change in the preview. You are still responsible for the bookkeeping, so check accounts and amounts before you approve.
Can ChatGPT change records in Fortnox?
Yes, when the change is within your Fortnox permissions. By default a preview opens in your browser for every change. A company can turn on auto-approval so changes run directly; Fortnox permissions and Nordsynk's access policy still apply.
Which ChatGPT plan do I need?
You need a ChatGPT plan that supports custom MCP servers. Open Customize → Plugins in ChatGPT: if the Add menu has Create custom MCP server, Nordsynk works with your account.
What happens to my Fortnox data in ChatGPT?
Your AI assistant receives the Fortnox data needed to answer the question. Nordsynk also stores data for some workflows: protected SIE and ledger snapshots are used for reports and DataLinks, change details are needed for review and execution, and files sent through Dropzone are held temporarily. Read the privacy notice for purposes and retention. Review OpenAI's privacy policy for how ChatGPT handles conversation data.
What does it cost to connect ChatGPT to Fortnox?
The price is 199 SEK per Fortnox company per user per month through Fortnox. A user in three companies needs three seats. The cost of your ChatGPT plan is extra and is paid to OpenAI.
Does Nordsynk work with AI assistants other than ChatGPT?
Yes. The same server works with Claude, Cursor and other clients that support remote MCP with OAuth, and with Microsoft Copilot Studio. You set up the connection separately in each assistant.
Ready to ask your books?
Activate Nordsynk in Fortnox. Then connect ChatGPT in a few minutes.