Import SIE into Fortnox

Fortnox is Sweden's most widely used cloud-based accounting system. This guide walks you (or your accountant) through importing a SIE file from Vendion into Fortnox. The whole process normally takes 3–5 minutes.

Who is this for?

This article is written both for restaurant owners handling their own books and for accountants receiving SIE files from their Vendion client. The steps are identical – you just need a Fortnox login with permissions to the relevant company.

Prerequisites

• Active Fortnox subscription (Fortnox Bokföring, Smart or Pro all work)
• Login to the correct company (if you have several – verify by org number)
• SIE file exported from Vendion (see the article "Export SIE from Vendion – step by step")
• The file must be SIE Type 4 – Vendion always exports Type 4

Step by step in Fortnox

1. Log in to Fortnox

Go to fortnox.se and log in. Pick the correct company in the customer list if you have more than one.

2. Navigate to SIE import

Click Register → Imports and exports → SIE import in the main menu.

Alternative route: Type "SIE" in Fortnox's global search box (the magnifying glass).

3. Choose the SIE file

Click "Select file" and pick up vendion_bokforing_RestaurantName_2026-03.se from your computer.

Fortnox verifies:

• That the file is SIE Type 4
• That the organization number in the file matches the company you're logged in to
• That the fiscal year aligns

If the org number doesn't match you'll get a warning. Double-check you're logged in to the right Fortnox company.

4. Review the preview

Fortnox shows a preview with:

• Number of vouchers to be imported
• Total sum (debit = credit)
• Which accounts are used
• Date range

Reconcile here: The total should match the sum of your Z-reports for the period. If you exported March 2026 the sum should equal all March Z-reports combined. Cross-check against /admin/reports → "Z-reports" in Vendion.

5. Pick import settings

Fortnox asks:

• Chart of accounts: Choose "Update chart from file" if you want new accounts from Vendion added automatically. Choose "Use existing chart" if you've customized your Fortnox chart.
• Voucher series: Pick which series the vouchers should land in. The default is "A" for automatic. Use e.g. "Z" for Z-reports if you want to separate them from manual vouchers.
• Duplicate check: Leave "Skip duplicated vouchers" ticked. That way you can import the same file multiple times without getting duplicates.

6. Run the import

Click "Import". Fortnox processes the file:

1. Reads the chart of accounts
2. Verifies every voucher is balanced
3. Creates vouchers in the general ledger
4. Logs any warnings

The import takes 5–30 seconds depending on file size.

7. Verify the result

After import you see a summary:

• Number of imported vouchers
• Number of warnings (if any)
• Number skipped (duplicates)

Click "General ledger" to see the vouchers. They appear with series + number (e.g. "Z-42 2026-03-15") and the description from Vendion.

Reconciliation against Z-reports

After every month you should reconcile:

1. Total sales: Fortnox "Income statement" for the period should show the same sales as Vendion /admin/reports → "Period report"
2. VAT: Account 2610 (25%) + 2620 (12%) + 2630 (6%) in Fortnox should match Vendion's VAT report
3. Cash/card: Account 1910 (cash) + 1580 (card receivables) should match your physical cash count + card settlements from Swedbank Pay/Nets

If you find a discrepancy, see the article "Cash discrepancy and reconciliation" in the accounting module.

Common errors and fixes

"Account XXXX does not exist in the chart"

Cause: Fortnox's chart of accounts lacks an account Vendion uses (e.g. 2421 Gift card liability).

Fix: In step 5 above, choose "Update chart from file". Fortnox then adds missing accounts automatically. Alternatively: Manually add the account in Fortnox Register → Chart of accounts → New account.

"Organization number doesn't match"

Cause: You're logged in to the wrong company in Fortnox, or the org number is missing in Vendion.

Fix: Verify you're logged in to the right Fortnox company. If the org number is missing in Vendion – fill it in under /admin/settings → "Company details" and export SIE again.

"Voucher #N is unbalanced"

Cause: Should never happen, but can occur from a Vendion system error.

Fix: Contact Vendion support. We rebalance the voucher for you and you re-export SIE.

"The file contains unreadable characters"

Cause: The Latin-1 encoding is corrupt (e.g. if the file was opened in the wrong editor and re-saved as UTF-8).

Fix: Export the SIE file again from Vendion. Never open the SIE file in Notepad and re-save – always use the original file.

"Fiscal year doesn't match"

Cause: Fortnox has fiscal year July 1 – June 30, but Vendion exported Jan 1 – Dec 31.

Fix: Adjust the fiscal year in Vendion under /admin/settings → "Accounting" so it matches Fortnox.

Fortnox + Vendion in the future

Manual SIE import works fine today. But Vendion is launching a direct API integration with Fortnox (planned for ~May 2026) that automates this – vouchers flow to Fortnox in real time when a Z-report runs, no SIE file required. See the article "Direct Fortnox integration (planned)".

Help from Vendion

Stuck on an import? Contact support@vendion.com – we'll help you through the first import for free. Include:

• Screenshot of the error message in Fortnox
• The period you tried to import
• Your Vendion restaurant ID