Changelog & Statutory Updates
Statutory verification, tax code benchmarks, and calculation engine releases.
SoloTaxKit tracks statutory rule changes and updates its client-side calculation models to reflect IRS revenue procedures, annual inflation benchmarks, and safe harbor thresholds under the Internal Revenue Code.
October 2026 · Statutory Limits Verification
2026 & 2025 HSA Contribution & Proration Benchmarks
Verified Rev. Proc. 2024-25 inflation baselines: Self-only $4,300 (2025) / $4,400 (2026); Family $8,550 (2025) / $8,750 (2026); Catch-up $1,000 under IRC § 223(b)(3).
September 2026 · Logic Engine Review
IRC § 6654 Safe Harbor & § 6621 Interest Benchmarks
Validated 100% / 110% prior-year AGI safe harbor thresholds and underpayment penalty calculation vectors for 2026 estimated filings.