Fortnox OSS Configuration Guide

Set up EU OSS (One Stop Shop) VAT in Fortnox so Shopify orders post to the correct VAT account per country.

Last updated: July 20, 2026

This guide walks you through setting up EU OSS (One Stop Shop) VAT in Fortnox for the Shopify–Fortnox integration. Once configured, Shopify orders will automatically post to the correct VAT account per country. Follow the steps in order.

Create VAT Codes

Path: Settings → Accounting → VAT Codes → Create NewCreate one VAT code for each EU country you sell to.

Fortnox names the VAT code automatically — you only set the VAT rate.
Create a separate VAT code per country, even if two countries share the same rate (e.g. Denmark and Croatia are both 25%, but need different codes).

Example reference:

VAT Code	VAT Rate	Country
`MP4_KUND`	25%	Denmark
`MP5_KUND`	25%	Croatia
`MP6_KUND`	19%	Germany
`MP7_KUND`	20%	France
`MP8_KUND`	27%	Hungary

Follow the reference images below to create the VAT codes correctly:

Fortnox settings — navigating to VAT Codes — Open VAT Codes under Settings → Accounting

Creating a new VAT code in Fortnox — Create a new VAT code

Setting the VAT rate — Set the VAT rate for the country

Create Sales Accounts

Path: Register → Chart of Accounts → Create AccountCreate a sales account for each country and link it to the VAT code from Step 1.

If you don’t need country-by-country sales tracking, skip this step and keep using the default account 3106 for all EU OSS sales.

Example reference:

Sales Account	Recommended Name	VAT Code
`3109`	Sales acc. to OSS (Denmark 25%)	`MP4_KUND`
`3110`	Sales acc. to OSS (Croatia 25%)	`MP5_KUND`
`3111`	Sales acc. to OSS (Germany 19%)	`MP6_KUND`
`3112`	Sales acc. to OSS (France 20%)	`MP7_KUND`
`3113`	Sales acc. to OSS (Hungary 27%)	`MP8_KUND`

Follow the reference images below to create the sales accounts correctly:

Navigating to the Chart of Accounts in Fortnox — Open the Chart of Accounts under Register

Creating a new sales account — Create a new account

Linking the sales account to the VAT code — Link the sales account to its VAT code

Create VAT Accounts

Create the accounts that will hold the VAT collected for each EU country.

Leave the VAT Code field blank.
Set Suggest Debit/Credit to Credit.

Example reference:

VAT Account	Recommended Name
`2661`	VAT acc. to OSS (Denmark 25%)
`2662`	VAT acc. to OSS (Croatia 25%)
`2663`	VAT acc. to OSS (Germany 19%)
`2664`	VAT acc. to OSS (France 20%)
`2665`	VAT acc. to OSS (Hungary 27%)

Navigate to the Create Account section by following the first two images in Step 2, then use the image below as a reference to create the VAT accounts.

Creating a VAT account in Fortnox — Creating a VAT account — VAT Code blank, Suggest Debit/Credit set to Credit

Link VAT Codes to VAT Accounts

Path: Settings → Accounting → Default AccountsUnder the VAT section, find each VAT code you created in Step 1 and enter its matching VAT account from Step 3 next to it.

This is what makes invoices post automatically to the right VAT account — without it, Steps 1–3 won’t connect to each other.

Example reference:

VAT Code	VAT Account
`MP4_KUND`	`2661`
`MP5_KUND`	`2662`
`MP6_KUND`	`2663`
`MP7_KUND`	`2664`
`MP8_KUND`	`2665`

Follow the reference images below to link the VAT codes to their VAT accounts:

Opening Default Accounts — Open Default Accounts

Locating the VAT section under Default Accounts — Locate the VAT section

Entering the VAT account for each VAT code — Enter the matching VAT account next to each VAT code

Setup complete. Shopify orders for each EU country will now post sales to the correct sales account and VAT to the matching OSS VAT account in Fortnox.

Need help getting started?
Our team is here to guide you through the setup process.Book a free consultation