See mortgage interest relief at source. Dresdner Kleinwort Wasserstein financial glossary
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MIRAS MIRAS [ˈmaɪræs] also Miras noun [uncountable]
TAX mortgage interest tax relief at source; a system in the UK where people with a mortgage (= loan to buy property) were able to get money back from the tax system. MIRAS stopped from April 2000
Financial and business terms. 2012.