voluntary compliance
noun [ U ]
ukus LAW
the act of obeying a particular rule or law, or of acting according to an agreement without being forced to:
Voluntary compliance with safety recommendations is more effective than increased regulation.
TAX
in the US, the system of collecting taxes that trusts people to honestly report the income on which they owe tax:
The reduction in tax rate will also promote voluntary compliance on the part of taxpayers and reduce tax evasion.