There are many tax problems and calculations that I can solve, for everything else there is Lacerte.

2023 tax software survey - Journal of Accountancy

"More single-preparer firms (nearly 30%) reported using Drake Tax than any other product. Adding to those Drake users others in firms of two to five preparers who also used Drake Tax equaled 47% of respondents in those combined size ranges. That was the highest percentage in the combined range of up to five preparers, although UltraTax CS's 32% in the two- to five-preparer range contributed to placing that product not far behind when adding in the single preparers who used it, for a combined 44%."