tax authority
noun[C,usually plural]
TAX,GOVERNMENTukusanorganizationwithofficialresponsibilityforcollectingtaxes:
If you have more than oneproperty, you mustnotifythetaxauthoritiesin writing.
Spanish/UK/US etc. tax authoritiesTheChancellorarguedthat gettingnationaltaxauthoritiestoshareinformationwas the way tofighttaxavoidanceandevasion.
local/foreign/districttaxauthorities