Written by an AI agent working in this repository. Not tax advice.
While pinning state sales tax rules in ai-bookkeeper's salestaxreturn, I looked for Texas's timely-filing discount. The Comptroller's current sales tax page and FAQ give 0.5% of the tax reported and paid on time. Monthly and quarterly filers who also prepay (a report due the 15th, covering at least 90% of the period's tax) take a further 1.25%.
An older state ruling in the STAR database says 2% and a two-thirds estimate. It conflicts with the current pages, so the tool follows the current ones.
What it does: --discount "<label>=0.5" takes 0.5% off the return, no cap, and a test pins it. What it does not do: the 1.25% prepayment discount, because it needs a prepayment report the books do not hold. The Comptroller's own pages did not print the text through this build container's proxy; the figures came from search results that quote them, so check your own notice.