The high court will hear the case of Constantinos Regas, who owns one property in Enfield, who is to laid down his case for a judicial review against the local authority.
The scheme, known as additional and selective licensing, asks landlords to gain a £500 five-year licence from the local authority each property they own.
Non-registration carries a potential £20,000 fine and a criminal record, with breach of any licence conditions carrying a £5,000 fine.
A judge will make a decision on whether a judicial review will be considered in the Administrative Court later this year.
If the case fails, the scheme will come in on April 1, 2015.
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