Every year, Danish residents must review and file their tax return. The good news is that the process is largely digital and, for most people, mostly a matter of checking and confirming information that has already been gathered on their behalf. It runs through SKAT’s E-tax portal, known as TastSelv, but there are still key deadlines, boxes to check, and pitfalls to avoid. This guide walks you through the entire process, from logging in to correcting mistakes.
What is the Danish tax return?
Your Danish tax return — the selvangivelse — is an annual declaration of your income, deductions, and tax calculation. It sits alongside the årsopgørelse, the annual assessment, which is SKAT’s pre-filled summary of your financial year based on information received from employers, banks, pension providers, and other sources.
The årsopgørelse becomes available in E-tax each year, typically from March. You review the pre-filled information, make corrections where needed, and submit. SKAT then issues your final skatteansættelse, the tax assessment, which determines whether you owe additional tax or are due a refund.
Filing deadlines
It is worth knowing the deadlines well in advance, because they differ depending on your situation:
| Situation | Deadline |
|---|---|
| Most employees and pensioners | 1 May |
| Self-employed (sole proprietors) | 1 July |
| Extensions (if requested) | Varies — check SKAT |
If you miss the deadline, SKAT may issue a foreløbig ansættelse, a preliminary assessment, which is often unfavourable. Filing as soon as you can is the simplest way to avoid that.
How to access E-tax (TastSelv)
Accessing the system is straightforward. Go to skat.dk/tastselv and log in with MitID, your Danish national digital ID. Alternatively, you can use an E-tax password, the TastSelv-kode, which you can order from SKAT.
Once logged in, you will see your pre-filled tax return. Much of the work has already been done for you: SKAT pulls data automatically from your employer (income and withholding), your bank (interest income, share gains and losses), your pension provider (pension contributions and withdrawals), and the property authorities (property values).
The key boxes to check
The tax return is organised into numbered boxes, and most people only need to look closely at a handful. The ones below matter especially for investors and homeowners.
For share and investment income, Box 66 covers share gains and losses — check that all sales of shares are reported correctly — while Box 61 covers dividends from Danish companies, Box 62 dividends from foreign companies, and Box 68 other share income.
If you hold assets through foreign platforms or own shares listed on foreign exchanges, the foreign holdings section is critical. Box 454 records the value of foreign shares at year-end, Box 452 covers dividends from foreign shares, and Box 496 is where you claim tax paid abroad as a foreign tax credit, which must match your documentation. Incorrect entries here can lead to double taxation or penalties.
For pension contributions, Box 310 covers contributions eligible for tax deduction. If you contribute to a ratepension or another qualifying pension scheme, check the amount is correct, because this deduction can meaningfully reduce your taxable income.
And for mortgage interest, Box 497 covers the rentefradrag — the mortgage interest you can deduct. If you own property and pay mortgage interest, this is normally pre-filled from your bank, but it is worth verifying the figure against your mortgage statements.
Common mistakes
The most frequent errors SKAT sees tend to cluster around a few recurring themes. One is not checking share information: SKAT receives data from Nordic settlement systems, but the information can be incomplete or incorrect, so always verify Box 66 and Box 68 against your own records. Another is forgetting foreign holdings. If you invest through a foreign broker such as Nordnet, Interactive Brokers, or Saxo Bank, you must manually report dividends and gains, because SKAT does not always receive that data automatically. Incorrect rentefradrag is another, since banks sometimes report interest incorrectly, especially if you changed mortgage providers during the year. Many people also miss cryptocurrency: crypto is taxed as shares in Denmark, so if you traded crypto you must report your gains and losses. Finally, people often overlook foreign tax credits — if you paid withholding tax abroad, for example US 15% on dividends, entering the amount in Box 496 lets you claim a credit against Danish tax.
How to correct your tax return
If you spot an error, the good news is that you can amend your return online through TastSelv at any time. There is, however, a deadline for changes: you can amend until 1 May of the third year following the assessment year. For the 2026 tax year, that means you have until 1 May 2029. After this deadline, SKAT will generally not accept changes unless there are exceptional circumstances.
To amend, log in to TastSelv, navigate to the tax return for the relevant year, edit the relevant boxes, and submit the changes. SKAT will then issue a new assessment.
Appealing a tax assessment
If you disagree with SKAT’s final assessment, you can appeal within three months of the date of the assessment. Use the Indsigelse (objection) function in TastSelv, and be sure to explain why you believe the assessment is incorrect and to attach supporting documents. SKAT will review your objection and respond, and if you disagree with their response, you can escalate the matter to Landsskatteretten, the National Tax Tribunal.
Documents to keep
Good record-keeping makes filing, correcting, and surviving any audit far easier. Keep the following documents for at least three years, or six years if you are self-employed: purchase receipts for shares and other investments (to prove the acquisition cost), dividend statements from brokers and companies, mortgage statements showing interest paid, receipts for deductible expenses such as job-related costs and charitable donations, foreign tax certificates showing withholding tax paid abroad, and pension statements from pension providers. These documents are essential if SKAT audits your return or if you need to correct a previous filing.
Self-employed: special rules
If you are self-employed, running a sole proprietorship or enkeltmandsvirksomhed, your tax return is considerably more complex. You must submit as Erhverv (business) in TastSelv, your business accounts must be linked to your NemKonto, your primary bank account, and you report business income on a separate schedule. You may also need to file moms (VAT) returns separately. Self-employed individuals additionally pay AM-bidrag, the labour market contribution, at 8% on business income, which is calculated differently than it is for employees. Given the complexity and the higher penalty risk for errors, many people in this situation consider using a revisor, an accountant, to keep things on track.
Tips for a smooth filing
A little preparation goes a long way. Log in early — E-tax opens in March, and filing early gives you time to gather documents and avoid the May rush. Use SKAT’s guide boxes, since TastSelv has help text for every box; click the question mark icon for an explanation. Check your NemKonto so your refund goes to the right bank account. If you owe tax, you can pay in instalments by setting up automatic payments through Betalingsservice. And keep your records digitally — photograph receipts and store statements in a cloud folder, because SKAT can audit returns going back several years.
Conclusion
Filing your Danish tax return is straightforward if you stay organised. Review the pre-filled information carefully, check the key boxes — especially for share income and foreign holdings — and keep your documents somewhere safe. Most people can complete the process in well under 30 minutes through TastSelv. If your situation is complex, for example if you are self-employed or hold significant foreign investments, professional help from a Danish accountant is a sensible investment. The effort of checking a few boxes each spring is small compared with the cost of a mistake, but for the vast majority of residents the whole exercise is a quick confirmation rather than a burden.