Glossary
Anniversary increase
An increase that happens on the anniversary of the contract, not necessarily on January 1.
The anniversary is the date the agreement says, most often the commencement date. A contract that started March 1 increases on March 1. A billing calendar organized around January will miss it every year.
On a route business such as pest control, every account can have a different anniversary. A single January increase across the book is the wrong operation unless every contract actually says January.
Count completed anniversaries before you compound. The increase that happens on the anniversary date applies to invoices from that date forward, not to the months that came before it, unless the clause expressly allows a true-up.
Put the anniversary, the notice deadline that precedes it, and the first invoice the new rate may appear on, in one line on the worksheet. If those three dates are not written down, the increase will be late.
Related terms
See it used in a worked example · CPI calculator · Request an audit
Sources and limits
Index levels from the U.S. Bureau of Labor Statistics Consumer Price Index, not seasonally adjusted, retrieved through the BLS Public Data API on November 1, 2026. Values are index points, not the headline 12-month percent.
Statewide rates reflect U.S. Department of Labor state minimum-wage postings as updated January 1, 2026, the U.S. Department of State Diplomatic Note on 2026 increases, and, for the prior-year comparison and named local rates, the National Employment Law Project compilation published in November 2025. Confirm the rate that applies to the workplace before using it in a bill.
The contracts in these worksheets are fictional. The prices are chosen so the arithmetic is easy to check. They are not a price survey and they are not client results.
RateClause is not a law firm. Nothing on this page is legal advice. Your clause controls, including whether a past period can be rebilled at all.
Primary postings: BLS Consumer Price Index, U.S. Department of Labor, state minimum wages, U.S. Department of State notice of 2026 minimum-wage increases.