SKAT VAT audit — how to prepare

SKAT conducts VAT audits for two primary reasons: to detect fraud and to detect errors. Most audits actually address the latter — honest mistakes, not deliberate evasion. SKAT selects businesses for audit partly through random sampling and partly through risk profiling. Typical triggers for risk profiling include: large VAT refunds, especially first-time requests from a given business; discrepancies between moms-return rubrics and the EU sales list (VIES mismatches); unusual patterns in rubric distribution compared to the industry norm; sector-wide audits where SKAT systematically investigates a particular industry; and tips from informants or cross-matches with other data sources. It's important to understand that being selected for audit is not in itself a sign that SKAT suspects you of anything. Many audits conclude without findings. In fact, the most common 'errors' in moms audits are minor matters: a single invoice missing a correct CVR, an EU transaction misclassified, a missing document for a small purchase. Most end in small regulations, not penalties.

In a moms audit, SKAT typically focuses on six areas: (1) Supporting documents for every moms deduction — every incoming invoice that led to a deduction must be present, legible and contain the statutory particulars: seller's CVR, invoice number, date, amount and VAT specified. (2) Correct moms codes per transaction — are sales classified at the right VAT rate (25% standard, 0% zero-rated, reverse charge, exempt)? Is entertainment deducted at the correct 25% (Momsloven §42)? (3) EU sales list matches the moms return — the sum of Rubric B on the moms return must agree with the submitted EU sales list. Here SKAT often finds small discrepancies. (4) Reverse charge correctly registered — both on the sales side (EU B2B sales without VAT, with buyer's CVR on the invoice) and on the purchase side (EU purchases where you've reported acquisition VAT as both output and input VAT). (5) Private-use adjustments documented — if the business has company cars, phones or other mixed private/business items, the split must be documented and consistent. (6) Elafgift/vandafgift only for eligible industries — SKAT specifically checks that liberal professions haven't fully deducted elafgift and that service industries haven't deducted vandafgift.

The best preparation for a potential moms audit isn't something you do when the audit arrives — it's something you do continuously. Per Bogføringsloven §10, all supporting documents must be kept for 5 years from the end of the accounting year they relate to. Digital storage is fully permitted as long as documents are legible, immutable and can be retrieved within reasonable time (typically 1-2 business days). What does 'continuous preparation' mean in practice? Three things: first, use consistent moms codes. If you switch between different classification systems throughout the year, your moms return becomes messy and SKAT gets suspicious. Use one logic and stick to it. Second, document the reasoning for unusual transactions. If you one day record a moms deduction that falls outside your normal pattern — a large one-off purchase, a new type of supplier, an international transaction — write a short note in the bookkeeping explaining why it was classified that way. Six months later you'll have forgotten the reasoning; the note saves you. Third, conduct an annual internal review. Once a year, ideally in January or February after the accounting year closes, you (or your accountant) review all bookkeeping entries for the past year and identify anomalies. It's the same exercise SKAT would do — but if you do it first, you can fix the errors before they become problems.

When you receive an audit letter from SKAT, the first thing stated is typically a date by which you must submit the requested material. The response window is normally 14-30 days depending on the audit's scope. First advice: don't panic. An audit is not a verdict. Next: read the letter carefully and note exactly which material SKAT is asking for. Typically it's one of three types: either the entire moms return for a specific period (with underlying documents), or a specific transaction or transaction group, or a single rubric on the moms return. Focus only on what they ask for. Submitting extra material they didn't request can open the door to additional questions. Third advice: be honest about mistakes. If you discover an error of your own during preparation, disclose it proactively to SKAT in your response. Voluntary disclosure (frivillig berigtigelse) reduces penalties significantly — often to zero. Concealing an error and hoping SKAT won't find it is a poor strategy; if they find it, the penalty multiplies. Fourth advice: contact your accountant. Even if the audit seems simple, an accountant review gives you confidence that your response is complete and legally sound. Fifth and most important advice: NEVER submit partial or inaccurate documentation just to get started. If you're missing a document, state that honestly and explain what happened. An honest 'I cannot locate the original invoice, but here is the bank statement and supplier confirmation' is always better than an incorrect or manufactured substitute.

MomsGate is designed with VAT audits as an explicit use case. Every moms return generated through the system has a complete audit trail: who filed the return, when it happened, what values were on each rubric, and which underlying transactions made up the numbers. Everything is available with a single click, so when SKAT asks 'why exactly DKK 127,453 in Rubric A?', the answer is immediate: a list of exactly the 23 transactions that make up that amount, with date, supplier, amount and invoice number for each. The system runs 139 validation rules on every moms return before filing. The rules catch errors like: wrong VAT rate for a given customer type, missing CVR on an EU transaction, inconsistency between the EU sales list and Rubric B, forgotten acquisition VAT, misclassified entertainment, exceeded reasonableness limits for private expenses and much more. Each error is shown with an explanation and a suggested fix, so you can correct before filing rather than being caught by SKAT afterwards. Period locking prevents retroactive changes. When a moms return is filed, the underlying bookkeeping entries for that period are locked — not because they can't be changed (you can always make a self-correction), but because any change requires an explicit regulation with a note about the reasoning. This creates a consistent history. Supporting documents are automatically matched against the bookkeeping: every purchase invoice from e-conomic is linked to the relevant moms-deduction entry, so missing documentation is caught at month-end closing. And SAF-T export is ready in seconds — the standard format SKAT often requests in larger audits is generated directly from MomsGate without manual data assembly.