AI for bookkeepingAutomate bookkeeping in Fortnox
without losing control.
Claude or ChatGPT does the groundwork in Fortnox: reads invoices, suggests coding, reviews the month and answers questions about the numbers. You decide what gets booked.
199 SEK per Fortnox company and user per month, through Fortnox.
Go through September and tell me what needs attention.
Review of Acme Bygg AB, 2026-09-01 to 2026-09-30. I only read, nothing is changed.
- To do2 customer invoices are created but not booked
- Overdue1 supplier invoice of 4,800.00 SEK is overdue
- OK14 paid invoices have a matching payment voucher
- Not doneBank reconciliation: no bank statement provided
2 changes are waiting for your approval
Book customer invoices 2031 and 2032
Six recurring jobs Nordsynk takes on
This is work Nordsynk does in Fortnox today. You ask for it in plain language in your AI assistant, and the answer is based on your own data in Fortnox.
Supplier invoices
Nordsynk Supplier Invoices (Leverantörsfakturor) receives the invoice at the company's own email address, checks it, suggests coding and sends it for authorization. 4 SEK per registered invoice, excl. VAT. It is a separate service and is not included in the 199 SEK licence.
› Show supplier invoices waiting for authorization, older than 30 days
Customer invoices
Describe the invoice with customer, rows and price. Nordsynk suggests accounts and VAT and prepares the invoice, so you see it before it is booked and sent.
› Create an invoice to Acme AB: 3 hours of consulting at 1,200 SEK
Vouchers with documents
Ask for a voucher and attach the document. The receipt or PDF from your computer is uploaded to the Fortnox archive and linked to the voucher.
› Book fuel 850 SEK on 5611 against 1930 and attach the receipt
Month review
Give the period and Nordsynk goes through customer and supplier invoices, the tax account and the general ledger, and lists what stands out. The review changes nothing.
› Go through September and tell me what needs attention
Bank reconciliation
Give Claude a bank statement as CSV or Excel for one account and one period. Nordsynk compares the rows with the general ledger and suggests which vouchers they belong to. You make the final link in Fortnox.
› Reconcile account 1930 for September against this bank statement
Reports and SIE
Profit and loss, account balances, VAT and unpaid invoices are read from Fortnox when you ask. The SIE file for a financial year can be exported right in the chat.
› Compare the result so far this year with last year
Let AI review the month before you do
The month-end is mostly checking: what is unbooked, what is overdue, what looks odd. That is the work Nordsynk takes over. You give the company and period, and Nordsynk reads invoices, the tax account and the general ledger in Fortnox.
The review runs when you ask for it, for the period you choose. It does not run in the background, and a check that could not be done is reported as not done instead of as clean.
What needs fixing becomes proposals that you approve. The review itself only reads.
Example · invented numbers
Month review · Acme Bygg AB
2026-09-01 to 2026-09-30 · read-only
| Check | Result | Next step |
|---|---|---|
| Customer invoices | Result2 created but not booked | Next stepBook after approval |
| Supplier invoices | Result1 overdue, 4,800.00 SEK | Next stepPay or contact the supplier |
| Paid invoices | Result14, all with a payment voucher | Next stepNone |
| Tax account | ResultInterest on 8423, 112.00 SEK | Next stepReview the entry |
| Duplicates | Result1 suspected double posting, A 412 | Next stepReview the voucher |
| Bank reconciliation | ResultNot done | Next stepGive Claude the bank statement |
You approve before anything changes
Nothing changes in Fortnox until you approve it.
Every proposal is shown as a preview with account, amount and counterparty. You approve or decline exactly what it says.
Decisions are logged. Fortnox's own permissions decide what each user can do, and on top of them Nordsynk's access policy per company decides which Fortnox areas the AI assistant may reach.
AI assistant
Proposes the change
You ask for it in plain language
Preview
You review
Account, amount and counterparty in plain words
Fortnox
Changes
Exactly what you approved
Rejected
A proposal can't be edited. If something is wrong, you reject it and ask for a new one.
Example · invented voucher
Preview · Fortnox
Book fuel, 850 SEK
Requested via Claude · Acme Bygg AB
| Account | In Fortnox now | After approval |
|---|---|---|
| 5611 Fuel for passenger cars | In Fortnox now— | After approval850.00 debit |
| 1930 Business account | In Fortnox now— | After approval850.00 credit |
Applies only to this exact change. If anything changes, Nordsynk asks again.
What should you not automate?
Under the Swedish Bookkeeping Act, the company, not an AI assistant, is responsible for the books being correct, complete and kept. Automate the groundwork and keep the decisions.
- 01
Judgements that affect the result
Accruals, depreciation and deductibility require a judgement. AI can gather the documents and suggest an entry, but you or your accountant make the decision.
- 02
Changed payment details
If a supplier suddenly has a new bankgiro, confirm it with the supplier on a number you already have, not with the details on the invoice.
- 03
Unusual and large entries
Read the first proposals carefully before you trust the pattern. Entries that differ from how the company usually books should always be reviewed by you.
- 04
Responsibility for the books
You can delegate the work but not the responsibility. If something is wrong, it is the company's books that are wrong, whoever or whatever suggested the entry.
How to get started in a few minutes
No code and no API keys. You need a Fortnox company and an AI assistant that supports MCP, such as Claude or ChatGPT.
- 01
Activate in Fortnox
Activate Nordsynk as an app in the Fortnox portal and sign in with your usual Fortnox account. It takes under a minute.
› Go to Administrera integrationer in Fortnox
- 02
Connect your AI assistant
Add the Nordsynk MCP server in Claude, ChatGPT or Cursor and sign in. You choose which companies may be used.
› Server URL: https://mcp.nordsynk.se/mcp
- 03
Ask for what you need done
Write as you would to a colleague. The assistant fetches what it needs from Fortnox and shows a preview when something is to be changed.
› Show unpaid supplier invoices from March
Pay per company and user
The licence is billed through Fortnox Marketplace together with your other Fortnox fees. There is no start-up fee and no separate payment.
Nordsynk
199 SEK
per Fortnox company and user per month
Nordsynk Supplier Invoices is a separate service at 4 SEK per registered invoice, excl. VAT. It is not included in the licence.
Example · invented team
Licences via Fortnox Marketplace
Nordsynk · one month
| Company | Users | Price | Total |
|---|---|---|---|
| Acme Bygg AB | Users2 | Price199 SEK | Total398 SEK |
| Acme Fastigheter AB | Users2 | Price199 SEK | Total398 SEK |
| Acme Holding AB | Users1 | Price199 SEK | Total199 SEK |
Questions about automating bookkeeping
Can bookkeeping be fully automated?
Not in a way you should rely on. The groundwork can be automated: reading invoices, suggesting accounts, reviewing a period and producing reports. The decision and the responsibility stay with you under the Swedish Bookkeeping Act. That is why Nordsynk shows every change as a preview before Fortnox is changed.
What is the difference between automatic bookkeeping and AI bookkeeping?
Automatic bookkeeping follows fixed rules, for example a bank event that is always booked to the same account. AI bookkeeping can also interpret an invoice, compare it with how the same supplier was booked before and explain why an account is suggested. Nordsynk uses AI for the proposals and your approvals for the decisions.
Which parts of bookkeeping can I automate in Fortnox?
Supplier invoices, customer invoices, vouchers with documents, month reviews, bank reconciliation and reports. Payroll, year-end closing and tax returns stay with you and your accountant, but Nordsynk can help you read and prepare the documents.
Do I have to approve every change?
By default, yes. A company can choose auto-approval in its settings, and changes from the connected AI assistant are then executed directly. Fortnox permissions, Nordsynk's access policy, validation and logging still apply. Choose it only for companies and users where you are comfortable with changes happening without an extra click.
Is it safe to let AI do the bookkeeping?
The AI assistant can only do what your Fortnox user is allowed to do and only reach the areas the company's access policy permits, and Nordsynk shows every change with account, amount and counterparty before approval. An approval applies to exactly that change. Proposals can't be edited, so what you approved is what was booked.
Does Nordsynk run anything in the background?
No. Nordsynk works when you ask your AI assistant for something, such as a month review for a period. There is no scheduled run that books without you involved. Supplier invoices through Nordsynk Supplier Invoices are the exception: they are received at the company's email address and sent for authorization.
What does it cost to automate bookkeeping?
199 SEK per Fortnox company and user per month, billed through Fortnox Marketplace. One user in three companies needs three licences. Nordsynk Supplier Invoices costs 4 SEK per registered invoice, excl. VAT, and is billed separately.
Do I need to know APIs or programming?
No. You write what you want done in plain language in Claude, ChatGPT or Cursor. You handle no API keys, and Nordsynk takes care of the connection to Fortnox.
Automate the groundwork. Keep the decision.
Activate Nordsynk in the Fortnox portal. It takes under a minute.