Quarterly Estimated Tax Calculator
Stop answering 'how much do I owe?' emails.
Hand to clients to estimate Q1-Q4 federal estimated taxes. Reduces 'how much do I owe?' emails from self-employed clients during tax season.
Available on both platforms — pick whichever you prefer.
What's Included
- ✓Q1-Q4 estimated payment calculator
- ✓Self-employment tax (15.3% SE) handled correctly
- ✓Federal income tax bracket math (2026 rates)
- ✓Standard vs itemized deduction toggle
- ✓Safe harbor check (100% / 110% prior-year tax based on AGI)
- ✓PDF export with payment voucher info
Frequently Asked Questions
Does this handle state estimated taxes?
No. This is federal-only (Form 1040-ES). State estimated tax requirements vary widely - consult your state tax authority or a tax professional for state amounts.
Is the safe harbor rule applied automatically?
Yes. The calculator flags whether your estimates meet the IRS safe harbor: 100% of prior-year tax if your prior-year AGI was $150,000 or less, or 110% if AGI was over $150,000. Meeting safe harbor avoids underpayment penalties even if you owe more at filing.
Can I use this for myself, or only clients?
Both. Many tax prep professionals use it for their own quarterly planning AND give it to clients. License is personal/business use, not redistribution.
Built by a practitioner
ARJE Digital is built by Arnold Dizon — a PTIN-certified tax professional running a 90+ client practice. Every tool ships with practitioner-grade precision because Arnold uses them every day on real client work.
Questions? Email arnold@arjebookkeeping.com
Personal/business use only. Not for redistribution. Calculators are planning tools, not professional advice.