Budget Impact Modelling for Health Technology Assessment R package htaBIM version 0.1.0 Implements a structured, reproducible framework for budget impact modelling (BIM) in health technology assessment (HTA), following the ISPOR Task Force guidelines (Sullivan et al. (2014) <doi:10.1016/j.jval.2013.08.2291> and Mauskopf et al. (2007) <doi:10.1111/j.1524-4733.2007.00187.x>). Provides functions for epidemiology-driven population estimation, market share modelling with flexible uptake dynamics, per-patient cost calculation across multiple cost categories, multi-year budget projections, payer perspective analysis, deterministic sensitivity analysis (DSA), and probabilistic sensitivity analysis (PSA) via Monte Carlo simulation. Produces submission-quality outputs including ISPOR-aligned summary tables, scenario comparison tables, per-patient cost breakdowns, tornado diagrams, PSA histograms, and text and HTML reports compatible with NICE, CADTH, and EU-HTA dossier formats. Ships with an interactive 'shiny' dashboard built on 'bslib' for point-and-click model building and exploration. Software Depends: R (>= 4.1.0) Imports: stats, utils, graphics, rlang (>= 1.1.0) Suggests: dplyr (>= 1.1.0), tidyr (>= 1.3.0), ggplot2 (>= 3.4.0), cli (>= 3.6.0), checkmate (>= 2.3.0), glue (>= 1.7.0), purrr (>= 1.0.0), tibble (>= 3.2.0), scales (>= 1.3.0), flextable (>= 0.9.0), officer (>= 0.6.0), shiny (>= 1.8.0), bslib (>= 0.7.0), bsicons (>= 0.1.2), DT (>= 0.31), openxlsx (>= 4.2.0), knitr, rmarkdown, testthat (>= 3.0.0), spelling, covr, pkgdown Shubhram Pandey <shubhram.pandey@heorlytics.com> Comprehensive R Archive Network (CRAN) Shubhram Pandey [aut, cre] (ORCID: <https://orcid.org/0009-0005-2303-1592>), Heorlytics Ltd [cph] MIT + file LICENSE (https://CRAN.R-project.org/package=htaBIM/LICENSE) 2026-04-21 application/tgz https://CRAN.R-project.org/package=htaBIM doi:10.32614/CRAN.package.htaBIM en-GB