The bulk of the savings would come from two changes in mail delivery.
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Darrell Issa has been waging an under-the-radar campaign to save the Postal Service for years now. The most recent iteration of his plan, the Postal Reform Act, would save $17 billion over the next ten years for the USPS. The major changes would be giving the USPS the ability to eliminate Saturday delivery and encouraging curbside rather than doorstep drop-offs.
Additionally, it would eliminate what the postal workers’ union has claimed is the major deficit on the USPS budget: a requirement that the USPS pre-fund retirement benefits to the tune of over $6 billion per year.