Tax investigators are door-knocking speculators - including those seeking to avoid the brightline law - as they work to reclaim $80 million in unpaid property taxes.

New Inland Revenue (IRD) data shows as many as one in four transactions where the brightline rule applies could be non-compliant, including an increased number of deliberate dodges.

Last year alone, unpaid tax from speculators or "traders", including the brightline, was $23 million. Another $57 million went unpaid in property-related GST, rental income and taxes due from builders and developers.

IRD said some of those traders were actively trying to hide their property transactions

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