For individual taxes in Denmark: - Your current-year preliminary info becomes available online in November, and is updated continuously as the tax authority ge

For individual taxes in Denmark: - Your current-year preliminary info becomes available online in November, and is updated continuously as the tax authority gets new information. You can log in at any time and correct things, declare unreported income, declare eligibility for commute subsidy, etc. The "regular" period for making such additions/corrections is through the end of February of the following year. - In the first week of March of the following calendar year, you get a PDF sent to you with the "final" tax computation based on what is in the system as of that date. The tax computation is fairly simple for most people; for me, this is a 3-page PDF, of which the actual computation takes up 1.5 pages. - If the form you get in March is correct and you're owed a refund, you don't need to do anything; the refund will be direct-deposited one month later (i.e. first week of April). If there are errors or omissions and/or you owe money, you have until May 1 to correct and/or settle it.