Rental affordability has worsened in more than eight out of 10 electorates since the last election, but neither Labor nor the Coalition offer compelling policies to help renters, analysts say.

The Coalition holds the vast majority of electorates with the worst rental affordability, while Labor carries nearly half of all electorates where it has deteriorated in the past three years, according to exclusive analysis provided to The Australian Financial Review by data analytics firm Cotality.