In business and finance writing, YoY means “year-on-year” or “year-over-year.” It is used for comparisons with the same period in the prior year, so the time basis should be clear in surrounding text.
ReviewedEvidence1 sourceSectionWriting & Style
Quick answer
YoY means “year-on-year” or “year-over-year” and compares a value with the corresponding period a year earlier.
Key details
Core IssueYoY abbreviates year-on-year or year-over-year and compares a metric with the same period in the previous year.
Phrase Rolebusiness-comparison shorthand
Registerbusiness, finance, and analytical writing
Important caveats
Usage Boundary
Use YoY for a comparison with the corresponding period one year earlier, not simply any change that happened during a year.
Further guidance
Meaning
YoY expands to year-on-year or year-over-year.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
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