As soon as the tax office has determined the assessed property value, the one-month appeal period begins upon receipt of the notice – an appeal should be filed as a precaution at least within this period.
The actual appraisal report can still be submitted after the appeal has been filed, provided the tax office agrees to an extension of the deadline or the proceedings are suspended accordingly.
If the appeal deadline is missed, the notice becomes final and binding, and a subsequent correction via an appraisal report is practically excluded – acting early is therefore crucial.
A tax notice becomes final and binding if it is not challenged by way of an appeal within the deadline; a later correction is then only possible in narrow exceptional cases, for example via a simple amendment pursuant to § 172 AO (German Fiscal Code).
Since preparing a well-founded appraisal report can take several weeks, it is advisable to take action promptly after receiving the assessment notice rather than waiting until shortly before the deadline expires.
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