Fortnox + AIFortnox AI: ask your books
in Claude or ChatGPT
Fortnox has its own AI features for invoices and booking suggestions. Nordsynk does something different: it lets your AI assistant read your Fortnox companies and prepare changes for you.
199 SEK per Fortnox company and user per month, bought in Fortnox.
Which customer invoices are unpaid after 30 days?
› Reading customer invoices in Fortnox
- Björk & Co41 days8 400 kr
- Björk & Co36 days3 200 kr
- Strand AB33 days15 000 kr
What Fortnox does with AI itself
This is how Fortnox describes its own features on fortnox.se, read on 12 October 2026. Prices are on Fortnox's pages and are not repeated here.
Invoice interpretation (Fakturatolkning)
Reads supplier invoices that arrive in Fortnox and gives automatic suggestions for accounts. You check the booking suggestion and approve it. Requires a Fortnox Bokföring licence.
AI-generated suggestions
In its text about the bookkeeping software, Fortnox calls the suggestions for supplier invoices AI-generated. If you are unsure about a suggestion, you can send the invoice on to your accounting firm.
AI assistant
Fortnox writes that a new AI assistant is being rolled out gradually during 2026. It is meant to answer bookkeeping questions and help create invoices and add customers and articles. Ask Fortnox whether it is active for your company.
Sources at Fortnox, read on 12 October 2026:
Your AI assistant, working directly on Fortnox
Nordsynk is an MCP server that connects an AI assistant, such as Claude, ChatGPT or Copilot, to your Fortnox company. The assistant can read invoices, vouchers and reports and answer questions in plain language.
Nordsynk connects to Fortnox with your own Fortnox account, so your Fortnox permissions apply throughout. You choose which companies the assistant may reach, and one connection can cover several companies.
AI assistant
ChatGPT or Claude
You ask in plain language
MCP server
Nordsynk
Company choice · access policy
Bookkeeping
Fortnox
Your company, your permissions
Changes
A preview opens in your browser that you approve or decline.
Fortnox AI or Nordsynk?
| Feature | Fortnox's own AI features | Nordsynk |
|---|---|---|
| Where you work | In Fortnox's own views. | In Claude, ChatGPT, Copilot or another AI assistant that supports MCP. |
| Incoming supplier invoices | Invoice interpretation reads the invoice and suggests accounts when it arrives in Fortnox. | The assistant finds and reads invoices and can prepare drafts when you ask. Automatic coding with a stated reason is part of Nordsynk Supplier Invoices, a separate service. |
| Questions about the books | A new AI assistant is being rolled out gradually during 2026, according to Fortnox. We have not been able to test it. | Questions and comparisons across your Fortnox companies, for example unpaid customer invoices by customer. |
| Changes | You check the booking suggestion and approve it. | Every change appears as a browser preview that you approve or decline. |
| Price | See Fortnox's package page. Invoice interpretation requires a Fortnox Bokföring licence. | 199 SEK per Fortnox company and user per month, bought in Fortnox. |
Where Fortnox's own tools fit better
If you mainly need to read and book incoming invoices and want to stay inside Fortnox, invoice interpretation goes a long way. It is built in, needs no extra integration and sits in the same flow as the bookkeeping. Nordsynk does not replace it.
Nordsynk fits when you already use an AI assistant and want it to work on your Fortnox companies. We have not been able to test Fortnox's own AI assistant, so we do not compare it point by point. Fortnox sets its own prices and terms.
Ask in plain language, get answers from Fortnox
Questions that only read are answered straight away. The answer is fetched from Fortnox when you ask, and Nordsynk needs no approval for it.
- Show all unpaid customer invoices over 30 days and group them by customer.
- Compare this month with last month for customer invoices and supplier invoices.
- Which supplier invoices fall due this week?
Example · sample invoices
| No. | Days | Customer | Amount |
|---|---|---|---|
| 2014 | 41 | Björk & Co | 8 400 |
| 2019 | 36 | Björk & Co | 3 200 |
| 2027 | 33 | Strand AB | 15 000 |
Changes need your approval
Nothing changes in Fortnox until you approve it.
When the assistant wants to create or change something, Nordsynk opens a preview in your browser. It shows field by field what would be written. You approve or decline it. Your Fortnox permissions and the company's access policy always apply.
Responsibility for the books stays with you and the company under the Swedish Accounting Act. An AI can be wrong, so read the preview before you approve.
Example · sample supplier invoice
Preview · Fortnox
Create supplier invoice draft, 12 500 kr
Requested via Claude · Acme AB
| Field | In Fortnox now | After approval |
|---|---|---|
| Supplier | In Fortnox now— | After approvalKvarnen AB |
| Amount | In Fortnox now— | After approval12 500.00 kr |
| Cost center | In Fortnox now— | After approvalMarketing |
| Project | In Fortnox now— | After approvalLaunch |
Nothing is written to Fortnox until you approve.
Video guide · 2:39
Create customer invoices in Fortnox with AI
Narrated in Swedish with English subtitles. The video plays from YouTube when you click.
Three steps from Fortnox to your AI assistant
- 01
Activate Nordsynk in Fortnox
An administrator buys Nordsynk for the company in Fortnox and assigns seats to the users who will use it.
- 02
Add Nordsynk to your AI assistant
Add the MCP server in Claude, ChatGPT or Copilot and sign in to Nordsynk with your email. You choose which companies the assistant may reach.
- 03
Ask your first question
Start with a read, such as unpaid customer invoices. When you ask for a change, a preview opens for you to approve.
Guides by AI assistant
199 SEK per Fortnox company per user per month
Nordsynk is bought in Fortnox and costs 199 SEK per Fortnox company per user per month. A seat covers one company and one user. If you work in three companies you need three seats, and one seat never covers all companies.
Fortnox sets the prices for its own AI features. See Fortnox's package page for what your package includes.
If you work at an accounting firm, a Nordsynk agreement with a different pricing model for client companies is available.
Example · sample user and companies
- Anna Lind · Acme AB199 kr
- Anna Lind · Björk & Co199 kr
- Anna Lind · Strand AB199 kr
per month
Fortnox AI: frequently asked questions
Does Fortnox have its own AI?
Yes. According to Fortnox (fortnox.se, read on 12 October 2026), invoice interpretation reads supplier invoices and suggests accounts, and a new AI assistant is being rolled out gradually during 2026. Check with Fortnox what applies to your company and package.
What is the difference between Fortnox AI and Nordsynk?
Fortnox AI is a set of features inside Fortnox. Nordsynk is an MCP server that lets an AI assistant outside Fortnox, such as Claude, ChatGPT or Copilot, read your Fortnox companies and prepare changes. You can use both.
Can I use ChatGPT or Claude with Fortnox?
Yes, with Nordsynk. You add the MCP server to your AI assistant, sign in to Nordsynk with your email and choose which companies it may reach. There are guides for Claude, ChatGPT and Copilot.
Can AI suggest accounts in Fortnox?
Yes. Invoice interpretation in Fortnox gives booking suggestions on supplier invoices that you check and approve. With Nordsynk your AI assistant can also look at earlier vouchers and suggest an account in the chat. You always decide what is booked.
Can AI do my bookkeeping in Fortnox?
AI can prepare a voucher or an invoice draft, but Nordsynk shows every change as a preview that you approve or decline. Responsibility for the books stays with you and the company. A company can turn on auto-approval.
What does Nordsynk cost?
199 SEK per Fortnox company and user per month, bought in Fortnox. Fortnox sets the prices for its own AI features, so see their package page for what your package includes.
Do I need a seat in every company?
Yes. A seat covers one Fortnox company and one user. If you work in three companies you need three seats, and one seat never covers all companies.
What does the AI assistant see of my books?
Only what Nordsynk fetches when you ask, and only for the companies you have approved. Your Fortnox permissions and the company's access policy apply, so the assistant reaches no more than you do.
Does Nordsynk work for accounting firms?
Yes. Firms can use a Nordsynk agreement with its own pricing model for client companies instead of seats per company. Read more on the page about Nordsynk for accounting firms.
Ask your Fortnox books in the AI assistant you already use
Activate Nordsynk for the company in Fortnox and connect Claude, ChatGPT or Copilot.