As the SA Revenue Service (Sars) strike enters its second day, the tax collector and organised labour will meet at the Commission for Conciliation, Mediation and Arbitration (CCMA) on Friday.
The meeting is to engage in formal discussions in a bid to amend picketing rules.
Sars obtained a court interdict against unions to comply with the picketing rules on Thursday.
An interim labour court ordered that National Health Education and Allied Workers' Union (Nehawu) and Public Servants' Association of SA (PSA) members can picket only in places specified in the CCMA picketing rules issued in 2018.
"Sars' attempts have failed and resorted to an order adhering to picketing rules," PSA spokesperson Ivan Fredericks said.