A contract for sale of land associated with the purpose of delaying stamp duty payments is not rendered unenforceable where: the statutory scheme provides its own sanctions and does not expressly provide for unenforceability; the party seeking enforcement did not knowingly break the law; the illegal purpose was incidental to the bargain; the illegal purpose was not carried into effect (duty was paid with interest); unenforceability would be disproportionate; and it would confer a windfall on the party resisting enforcement. The unclean hands defence requires the impropriety to have an immediate and necessary relation to the equity sued for, and will not be made out where the impropriety was merely incidental or collateral to the contract and the impugned conduct has ceased.
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