• Mileage now uses the IRS rate for each trip's date: 72.5c/mile Jan-Jun 2026, 76c Jul-Dec 2026.
• Quarterly plan reworked: instalments are the statutory 25%, a missed quarter shows as overdue with the amount owed plus estimated penalty, and catch-up is listed separately.
• Retirement and self-employed health insurance now deduct above the line and flow into QBI.
• IRS.gov sources linked throughout. Not affiliated with the IRS.
• Updated for Android 16.