Details.
Registered mail owners who grow qualifying First-Class Mail or Marketing Mail volumes versus a defined threshold can receive a 30% postage credit for qualifying volume that exceeds the established threshold. The 2026 performance period is January through December 2026, the baseline period is January through December 2025, and registration is March through May 2026. Eligible mail includes qualifying First-Class Mail presort and automation letters, cards, and flats, plus specified USPS Marketing Mail letters, flats, carrier route, and parcels.