{"data":{"id":"us/5-cfr-591.209","jurisdiction":"us","citation":"5 CFR 591.209","heading":"What is a price index?","body":"(a) The price index is the COLA area price divided by the DC area price and multiplied by 100.\n(b) Example:\nCOLA Area Average Price for Item A = $1.233\nDC Area Average Price for Item A = $1.164\nComputation:\n$1.233/$1.164 = 1.0592783\n1.0592783 × 100 = 105.92783.\n(c) In the case of the final index, OPM rounds the index to two decimal places.","path":["Title 5—Administrative Personnel","CHAPTER I—OFFICE OF PERSONNEL MANAGEMENT","SUBCHAPTER B—CIVIL SERVICE REGULATIONS","PART 591—ALLOWANCES AND DIFFERENTIALS","Subpart B—Cost-of-Living Allowance and Post Differential—Nonforeign Areas"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-5.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:23:53Z","sha256":"20f3b1501f023b303820ea8cb8bf0c134f528c5a637eba845f3cb48de1722eee","source_id":"us-cfr","stale":true,"prev":"us/5-cfr-591.208","next":"us/5-cfr-591.210"},"notice":"GroundRules: Original legal text. Not legal advice."}