NSA Exception on Challenging Prior VAT Refund Extension Orders

The Polish Supreme Administrative Court (NSA) ruled that courts generally cannot review earlier VAT refund extension decisions if they were not challenged on time.
Exception: an earlier, unchallenged extension may still be examined when reviewing a later extension if the earlier decision had a serious defect, such as never being properly served.
In principle, only the challenged extension decision is reviewed; prior unchallenged extensions remain binding and cannot be reassessed for merits, proportionality, or reasoning.
The ruling matters because tax authorities can repeatedly extend VAT refund deadlines, delaying refunds for months or years.

Note that this post was (partially) written with the help of AI. It is always useful to review the original source material, and where needed to obtain (local) advice from a specialist.