Changelog & Statutory Updates
Annual inflation adjustments, IRS updates, and calculator improvements.
SoloTaxKit monitors IRS updates, annual inflation adjustments, and statutory guidance to keep every calculator accurate for the current and upcoming tax years.
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 · Estimated Tax Rules Update
Quarterly Safe Harbor & Underpayment Rules
Updated safe harbor thresholds (100% and 110% prior-year rules) and quarterly IRS interest penalty formulas for 2025 and 2026 estimated tax filings.