OpenChainGraph Suite · ART-752 · Port of Apex #116 · AL-123
Freelance Quarterly Estimated Tax Calculator
Quarterly IRS estimated payments for self-employed income: net SE income, SE tax (Social Security + Medicare), federal income tax on the 2026 brackets, an elective state bucket, the 2026 due dates, and the safe-harbor amount. Enter your figures, run.
2026 IRS constants (rate, wage base, brackets, deduction)Q2 due date: official 1040-ES Jun 15, 2026state bucket: illustrative elective ratesZero PIIClient-side only
🔒 All inputs are processed locally in your browser. No data is transmitted. Do not enter real personal data; use synthetic or anonymised inputs only.
Scope & reliance
The node computes net SE income (gross minus business expenses), SE tax at 12.4% Social Security (capped at the 2026 wage base of $184,500) plus 2.9% Medicare on 92.35% of net earnings, federal income tax on the 2026 brackets after the employer-equivalent half of SE tax and the 2026 standard deduction ($16,100 single / $32,200 MFJ), an elective state bucket (none/low/mid/high = 0/3/5/9.3%, an illustrative assumption rather than a jurisdiction lookup), equal quarterly installments of the annual total, and the safe harbor (the lesser of 100% of prior-year federal tax or 90% of current-year federal tax). Ported from ApexLogics Apex #116 (AL-123) with the official 2026 IRS constants. One constant was corrected to the official source at porting: the Q2 2026 due date ships as June 15, 2026 per IRS Form 1040-ES, where the Apex page listed June 16 (payload DIFFERS.md D1). Three Apex omissions ride flagged rather than silently patched: the 0.9% Additional Medicare Tax, the 110% high-earner safe-harbor prong, and the $1,000 de minimis exemption (DIFFERS.md D2-D4, report items R2-R3); above those thresholds this calculator understates tax, exactly as the source page does.Income
Filing & state
Safe harbor & payments to date
Result
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Total annual tax
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Per quarter
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Safe harbor / qtr
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| Component | USD |
|---|
2026 quarterly due dates
| Quarter | Due | Amount (USD) |
|---|
Execution hash & kernel output
execution_hash: n/a
{}
Proof status
This node ships compute_proof_ready: deferred. No formal correctness proof has been produced for this kernel; the result above is a deterministic recompute, verified by a property-test floor, not a proven one.Ask your agent
Copy this paragraph into Claude, OpenClaw, or any MCP-aware agent to run this exact tool, with this sample, and verify the artifact.
Run the AINumbers MCP tool `estimate_quarterly_tax`. Task: Quarterly IRS estimated tax for self-employed income: net SE income, SE tax (SS + Medicare), federal income tax on the 2026 brackets, an elective state bucket, equal quarterly installments with the 2026 due dates, and the 90%/100% safe-harbor amount.
Call it with arguments: {"policy_parameters":{"gross_income":120000,"business_expenses":15000,"other_income":0,"filing_status":"single","state":"high","prior_year_tax":0,"ytd_paid":0}}
Verify before trusting: call `verify_execution_hash` on mcp.ainumbers.co (https://mcp.ainumbers.co/mcp) with the parameter `claimed_hash` set to the returned `execution_hash`, passing the full artifact the run returned (the object containing `policy_parameters` + `output_payload` + `execution_hash`; equivalently `policy_parameters` + `output_payload` with `claimed_hash`), not the bare hash string.
Return the ledger link https://ledger.ainumbers.co/ so a human can re-verify without contacting us.
PII rule: All inputs are processed locally in your browser. No data is transmitted. Do not enter real personal data — use synthetic or anonymised inputs only.
Over MCP, the run happens on the AINumbers worker. No AINumbers server stores your inputs.
Open the tool with the sample prefilled: https://ainumbers.co/chaingraph/art-752-freelance-quarterly-estimated-tax.html#p=v1.H4sIAAAAAAAA_wGKAHX_eyJncm9zc19pbmNvbWUiOjEyMDAwMCwiYnVzaW5lc3NfZXhwZW5zZXMiOjE1MDAwLCJvdGhlcl9pbmNvbWUiOjAsImZpbGluZ19zdGF0dXMiOiJzaW5nbGUiLCJzdGF0ZSI6ImhpZ2giLCJwcmlvcl95ZWFyX3RheCI6MCwieXRkX3BhaWQiOjB9m1dYyYoAAAA