# Data quality – AddressValid

> Deduplication, returns, CRM hygiene and what bad addresses cost.

- [Address Correction Fee: What UPS Charges in 2026](https://address-valid.com/data-quality/address-correction-fee/): An address correction fee is what a carrier bills the shipper when a package carries a wrong or incomplete address and the carrier finds the right one. UPS charges 25.25 US dollars per package on US Ground and Air shipments in 2026, capped at 175.25 dollars per shipment. Validating addresses before printing labels avoids most of these charges.
- [National Change of Address (NCOA): How List Updates Work](https://address-valid.com/data-quality/national-change-of-address/): National Change of Address (NCOA) is the USPS file of permanent change-of-address requests, about 160 million records. Mailers do not get the file itself; they run their lists through licensed NCOALink providers, who return new addresses for people and businesses that moved within the last 18 or 48 months, depending on the licence.
- [Address Deduplication: Finding Duplicate Customer Records](https://address-valid.com/data-quality/address-deduplication/): Address deduplication finds records that describe the same delivery point or the same customer despite different spelling. Normalise first (case, abbreviations, punctuation, spacing), build a match key, compare candidates only within the same postcode, review borderline pairs, and merge with clear rules about which record's fields win.

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