NextGen Coding Company published the Legacy Modernization Benchmark 2026, which finds that overrun in enterprise modernization programs concentrates in the integration surface — undocumented downstream consumers discovered mid-program — rather than in the scope of the replacement system itself. This release is free to republish in full, including commercially, with a link back to Legacy Modernization Benchmark 2026.
NEW YORK, February 10, 2026 — NextGen Coding Company today published the Legacy Modernization Benchmark 2026, a study of enterprise modernization programs that locates where schedule and budget actually slip.
The pattern is consistent: teams scope the rewrite carefully and then discover the integration surface. Reports, batch jobs, partner feeds, and internal tools that read the legacy system were never inventoried at kickoff, and each one has to be found, understood, and either migrated or maintained in parallel.
The benchmark quantifies that discovery cost by program size and system age, and sets out the inventory step that separates programs that land near their estimate from programs that double.
The full benchmark, including tables by program size, sequencing patterns, and the methodology, is published free to read and free to cite at nextgencodingcompany.com/legacy-modernization-benchmark-2026.
Key findings
Integration surface drives overrun
Slip concentrates in undocumented downstream consumers of the legacy system, not in the scope of the replacement build.
Discovery happens mid-program
Consumers are typically found after the replacement is under construction, when parallel-run cost is highest.
Inventory-first programs land closer to estimate
Programs that complete a consumer inventory before committing to a cutover date show materially tighter schedule variance.
“The rewrite is the part everyone can see, so it is the part everyone estimates. The programs that go sideways go sideways on the twenty things quietly reading that database at 2am that nobody put on the plan.”
Methodology
Drawn from our own modernization engagements and delivery telemetry, with schedule variance measured against the baseline plan agreed at kickoff. Each table states its sample basis on the report page. Sample composition skews to enterprise and mid-market systems in financial services, insurance, and public sector IT.
Full tables, definitions, and the dated changelog are on the report page: Legacy Modernization Benchmark 2026. Related services: Legacy system modernization.
Reuse and attribution
Data and tables are licensed CC BY 4.0. Attribution line: NextGen Coding Company, Legacy Modernization Benchmark 2026, 2026, https://www.nextgencodingcompany.com/legacy-modernization-benchmark-2026. Syndicating partners may republish this release verbatim or edited for length.
NextGen Coding Company is a US-based software engineering firm that builds and modernizes production systems for enterprises — custom software development, AI development, legacy modernization, and embedded engineering teams. The firm publishes original benchmark research on engineering cost, delivery models, and enterprise AI adoption, free to cite under Creative Commons Attribution 4.0.
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