This is the 13441st most frequent Russian word.
налоговикам
"To tax officers" or "for tax officers" (dative plural form of "налоговик," meaning "tax officer").
Here, "налоговикам" is used in the dative plural form, referring to tax officials who require documents, showing a recipient or beneficiary.
Налоговикам нужно предоставить все необходимые документы.
Tax officials need to be provided with all the necessary documents.
In this sentence, "налоговиками" is in the instrumental plural form, emphasizing interaction with the tax officials.
Мы обсудили текущую ситуацию с налоговиками.
We discussed the current situation with the tax officials.
"Налоговикам" is in the dative plural form again, signifying the indirect object (to whom the tasks were explained).