Docs: Amazon generated ~$3.9B in revenue and $1.6B in profit for USPS during FY2019; USPS delivered 1.54B packages for Amazon, or 30% of Amazon's 2019 volume
Context & Ripple Effects
The FY2019 documents put hard numbers on an argument analysts had been making since at least 2018, when reporting showed Amazon's parcels helping offset the Postal Service's first-class mail decline despite White House attacks on the relationship (analysts argued Amazon was mitigating USPS decline). The disclosure — ~$3.9B in revenue, ~$1.6B in profit, 1.54B packages or roughly 30% of Amazon's 2019 volume — quantifies how much of the agency's parcel business hangs on one customer.
The same year, Rakuten data showed Amazon already self-delivering around 48% of its own US packages, up from 15% two years prior when USPS carried 60%+ — meaning the profit stream disclosed here was already structurally shrinking. That trajectory ran to its logical end: by late 2025 Amazon, then providing $6B+ annually, weighed exiting entirely, and the 2026 renegotiation settled on a 20% package reduction rather than the proposed two-thirds cut.
First-order effects
- USPS' books are confirmed dependent on a single customer for a $1.6B annual profit contribution at exactly the moment Amazon is shifting volume to its own network.
Second-order effects
- Amazon's in-house buildout — which had it shipping 5.2B US packages in 2022, past both FedEx and UPS — converts USPS from indispensable partner to negotiable overflow capacity, gutting its bargaining power in contract renewals like the 2026 one.
Third-order effects
- If the pattern holds, universal-carrier economics invert: the postal network becomes a subsidized last-mile utility whose most valuable commercial customer is also its cheapest exit risk, forcing either rate restructuring or deeper reliance on other shippers to backfill lost density.
The trend: US parcel logistics is consolidating around shipper-owned networks, turning legacy carriers' biggest customers into their biggest competitive threats.