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The IF campaign says developing countries lose some US$160 billion of tax revenues a year from multinationals shifting profits offshore before they can taxed.
Christians are being encouraged to do no business with tax-dodging corporations such as Amazon and Starbucks for the duration of Lent.
Christian Aid says that chancellor George Osborne has spoken out against tax evasion and aggressive tax avoidance, but has failed to act accordingly.
Ministers should urgently rethink plans for a deal with Switzerland which would see UK tax evaders let off lightly while harming poor countries.