Fidamen

Estate Tax Calculator

This tool provides scenario-based estimates of estate tax exposure. It is intended to help you understand order-of-magnitude outcomes after subtracting debts, administration costs, and allowable deductions, then applying an exemption and assumed tax rates.

Estimates are not a substitute for professional tax or estate planning advice. Laws and exemption amounts change; enter current exemption values and, when relevant, consult counsel for valuation, basis adjustments, and state-specific rules.

Updated Nov 13, 2025QA PASS — golden 25 / edge 120Run golden-edge-2026-01-23

Governance

Record 6cab11bb9c94 • Reviewed by Fidamen Standards Committee

Quick calculation: subtract liabilities and deductions, apply exemption, then apply an assumed federal marginal rate to compute an estimated federal tax liability.

Inputs

Results

Updates as you type

Net estate (assets minus debts & deductions)

$2,000,000.00

Estimated taxable estate

$0.00

Estimated federal estate tax

$0.00

OutputValueUnit
Net estate (assets minus debts & deductions)$2,000,000.00USD
Estimated taxable estate$0.00USD
Estimated federal estate tax$0.00USD
Primary result$2,000,000.00

Visualization

Methodology

Calculations follow standard accounting order: determine gross estate, subtract allowable liabilities and deductions to compute the net estate, reduce by applicable exemptions and reported lifetime taxable gifts to produce a taxable estate, and apply an assumed effective tax rate to estimate liability.

Security, privacy, and development practices for this tool align with published standards for trustworthy systems and risk management. See NIST Special Publications and ISO risk-management guidance cited below for controls and system development practices.

Worked examples

Example 1 — Quick estimate: Gross estate $2,000,000; debts & deductions $200,000; federal exemption $12,900,000; taxable estate becomes zero, estimated federal tax $0.

Example 2 — State-adjusted: Gross estate $15,000,000; debts & deductions $500,000; federal exemption $13,000,000; taxable estate $1,500,000. With assumed federal rate 0.40 and assumed state rate 0.05, estimated federal tax $600,000 and state tax $75,000; total $675,000.

F.A.Q.

Is this an official tax calculation?

No. This is an estimate tool for planning and scenario comparison only. It does not replace filings, formal valuations, or professional advice. Use current statutory exemption numbers and consult a tax attorney or CPA for filing and compliance.

How should I choose the assumed federal rate?

The assumed federal rate is a user-entered effective marginal estimate that approximates the progressive tax schedule. For conservative planning, use the top marginal rates applicable to the portion of the estate above the exemption; a tax professional can produce an exact bracketed computation.

Does this include state estate or inheritance taxes?

This tool can include a user-specified state rate when a jurisdiction imposes an estate tax, but it does not encode every state’s brackets, exemptions, or credits. Confirm state-specific rules with state tax authorities or counsel.

How accurate are the results?

Accuracy depends on the correctness of your inputs (asset values, debts, deduction amounts, exemption chosen, and assumed rates). This tool provides estimates only. See the Accuracy & Compliance note in citations for recommended verification standards.

Sources & citations

Further resources

Versioning & Change Control

Audit record (versions, QA runs, reviewer sign-off, and evidence).

Record ID: 6cab11bb9c94

What changed (latest)

v1.0.0 • 2025-11-13 • MINOR

Initial publication and governance baseline.

Why: Published with reviewed formulas, unit definitions, and UX controls.

Public QA status

PASS — golden 25 + edge 120

Last run: 2026-01-23 • Run: golden-edge-2026-01-23

Engine

v1.0.0

Data

Baseline (no external datasets)

Content

v1.0.0

UI

v1.0.0

Governance

Last updated: Nov 13, 2025

Reviewed by: Fidamen Standards Committee (Review board)

Credentials: Internal QA

Risk level: low

Reviewer profile (entity)

Fidamen Standards Committee

Review board

Internal QA

Entity ID: https://fidamen.com/reviewers/fidamen-standards-committee#person

Semantic versioning

  • MAJOR: Calculation outputs can change for the same inputs (formula, rounding policy, assumptions).
  • MINOR: New features or fields that do not change existing outputs for the same inputs.
  • PATCH: Bug fixes, copy edits, or accessibility changes that do not change intended outputs except for previously incorrect cases.

Review protocol

  • Verify formulas and unit definitions against primary standards or datasets.
  • Run golden-case regression suite and edge-case suite.
  • Record reviewer sign-off with credentials and scope.
  • Document assumptions, limitations, and jurisdiction applicability.

Assumptions & limitations

  • Uses exact unit definitions from the Fidamen conversion library.
  • Internal calculations use double precision; display rounding follows the unit's configured decimal places.
  • Not a substitute for calibrated instruments in regulated contexts.
  • Jurisdiction-specific rules may require official guidance.

Change log

v1.0.0 • 2025-11-13 • MINOR

Initial publication and governance baseline.

Why: Published with reviewed formulas, unit definitions, and UX controls.

Areas: engine, content, ui • Reviewer: Fidamen Standards Committee • Entry ID: 88e27ffbf0a2