To cite package ‘Fiscal’ in publications use:

  Eisler M (2026). _Fiscal: Income Tax Calculations (UK)_. R package
  version 1.0.2, <https://github.com/mark-eis/fiscal>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {Fiscal: Income Tax Calculations (UK)},
    author = {Mark Eisler},
    year = {2026},
    note = {R package version 1.0.2},
    url = {https://github.com/mark-eis/fiscal},
  }