Preparing Dutch annual accounts from MUIS Software (iMUIS)

The short answer

iMUIS and iMUIS Online have no longer been supported since 31 March 2026; in the cloud, access has lapsed. Supplier Bjorn Lunden refers to KING Finance and KING Accountancy, which are built on the database of iMUIS Online. For the 2025 annual accounts you work with the migrated administration, or with the audit file you exported before that date.

Updated 30 October 2026

Key facts

What happened to iMUIS

Anyone who goes to muis.nl now ends up at Bjorn Lunden, the supplier behind the KING products. The support site states the decision: ‘Support for iMUIS and iMUIS Online stops on 31 March 2026.’ The supplier shifts its attention to KING Finance for entrepreneurs and KING Accountancy for firms.

What the successor to iMUIS offers for the annual accounts

KING Finance and KING Accountancy are accounting packages. We did not find a module on Bjorn Lunden's pages that prepares or files annual accounts under Title 9 Book 2 DCC. KING Accountancy mentions links with annual accounts software and reporting tools. The annual accounts are therefore, as before with iMUIS, produced at your firm or in separate software.

According to Bjorn Lunden both packages are ‘built on the database of iMUIS Online’ and the way of working and the functions are ‘virtually the same’. An administration moves across one to one, ‘including all historical years’.

Your 2025 figures: three situations

For KING Finance, Bjorn Lunden writes that reports and data are ‘easy to export’ to Excel and PDF. We did not find a public article with the exact menu path to the trial balance or the audit file; menus in the known articles follow the pattern menu – Financial – Ledger. Go by the content of the file and go through the checks on the trial balance.

RGS in iMUIS and KING

Whether your old iMUIS administration had RGS codes can no longer be looked up with the supplier. You can see it in the audit file itself: open the file in a text editor and look at a ledger account for a code starting with B or W. For KING Accountancy, Bjorn Lunden mentions support for the RGS bridge schedule. Without codes you link the accounts to the statutory line items as described in RGS mapping.

Checks on an audit file from iMUIS

• Whole financial year? Check the start and end date in the header of the file: 1 January to 31 December 2025.
• Date of export. Anything your bookkeeper posted after that is not in it.
• Opening balance. The opening positions must equal the closing balance sheet in the adopted 2024 annual accounts.
• Retention. The records must be kept for seven years art. 2:10(3) DCC. Transferring them to another data carrier is allowed, provided the data remain correct and complete art. 2:10(4) DCC.

Worked example: corrections after the last export

A BV exported the 2025 audit file on 20 March 2026. The profit in that file is € 58.300. In April the bookkeeper proposes two more items: € 6.900 depreciation and € 9.800 corporate income tax. These can no longer be posted in iMUIS Online. The annual accounts must nevertheless come to € 41.600. So record the two corrections as separate entries as at 31 December 2025, in the new package or in the annual accounts file, with an explanation of why they are not in the audit file.

If you did switch, it is simpler: in KING Finance the closing balance sheet automatically becomes the opening balance of the new year, and corrections in the old year carry along until you really close the year.

From iMUIS figures to annual accounts: mind the deadline

The stop of iMUIS changes nothing about the statutory deadline. If your financial year equals the calendar year, the 2025 annual accounts must be filed no later than 31 December 2026 art. 2:394(3) DCC. Micro and small entities file with SBR software or in the KVK portal Zelf Deponeren; for medium-sized and large entities the audit by an accountant is added art. 2:393(1) DCC.

iMUIS files and Jaarrekening.io

For the annual accounts, Jaarrekening.io reads an XAF audit file in version 3.1 or 3.2, or a trial balance in Excel or CSV. The app checks the period of the file against the financial year and warns if it finds no opening balance. If after iMUIS you are also looking for a new accounting package: the bookkeeping module has a Switch function that reads an audit file XAF 3.2 or 4.0 and prepares the entries as a draft; posting only happens after you have confirmed the check. Direct links with other packages are in preparation and not yet released; see linking to your accounting package.

When your firm can better compile the 2025 annual accounts

If you had a firm keep your administration and that firm migrated it to KING Accountancy, the old years are there too and the firm can simply compile the 2025 annual accounts. If you only have an audit file and closing entries are missing, help from a bookkeeper is wise: someone must assess which corrections are still needed and substantiate them.

Sources

• Bjorn Lunden support: iMUIS and iMUIS Online are stopping — dates, cloud and on-premise, successors, migration
• Bjorn Lunden support: The year tie-in in KING Finance (iMUIS Online) — closing balance becomes opening balance, corrections in the old year
• Bjorn Lunden: KING Finance — export of reports to Excel and PDF
• Bjorn Lunden: KING Accountancy — links with annual accounts software, RGS bridge schedule
• Art. 2:10 DCC (wetten.overheid.nl) — duty to keep records and retention for seven years
• Art. 2:394 DCC (wetten.overheid.nl) — filing within eight days after adoption, at the latest twelve months after the financial year
• KVK: Filing your annual accounts yourself — who can use the portal and how to log in

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