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The report found the wider impact of tax and benefit reforms since 2010 had reduced incomes for the poorest 40 and richest 10 of households.
The Chancellor said a new 'Family Home Tax Guarantee' would prevent the next government fiddling with council tax bands or imposing other new property charges.
The party will also pledge to build 1.5 million homes and overhaul the planning system to deliver more action on housing. But the Conservatives say Labour's "tax raid" will "punish first-time buyers".
Threshold would apply to households rather than individuals under plan that party says would cost £1.3bn a year
The party says it would increase the salary threshold at which a household starts to lose its child benefits.