This Practice Note looks at the remedies of retention and rescission for breach of contract under Scots law. In doing so, it considers various key principles in relation to rescission and retention including their being ‘self-help’ remedies, the mutuality principle in retention, whether retention and/or rescission can only operate where there has been material breach (or whether a de minimis breach is sufficient for these purposes), the effect of rescinding a contract, the ultimatum principle in the context of rescission and, finally, offers practical guidance on how to rescind a contract.