Estate Tax Planning Tools: Compare AI Guidance, Document Review, and Scenarios

Updated September 26, 2026.

Choose estate tax planning software by the work it performs: organizing financial context, interpreting documents, modeling transfers, or researching tax rules. Mezzi supports the financial conversation. FP Alpha provides professional document analysis and estate scenarios. RightCapital connects estate analysis with an adviser-led financial plan. Hive Tax AI supports professional tax research and planning.

High income alone does not determine estate tax exposure. Ownership, asset values, prior taxable gifts, applicable law, and family circumstances matter. A software subscription cannot replace the legal and tax work required to implement a strategy.

Method: Mezzi publishes this guide. We reviewed official product information, public pricing, and current IRS guidance on September 26, 2026. We did not implement matched estate plans or measure tax savings. This guide focuses on planning before a transfer or death; our estate tax compliance guide addresses records, research, and filing responsibilities.

Compare four distinct planning roles

The professional software license is not the price of the advice a family receives. Ask the adviser to describe their services, fee, and responsibility separately from the software they use.

Start with the right tax baseline

The IRS's July 2026 Form 706 instructions list a $15 million basic exclusion amount for 2026. For U.S. citizens and residents, the filing test considers the gross estate together with adjusted taxable gifts and the specified historical exemption item. It is not simply a comparison between a dashboard's net-worth number and $15 million.

The same instructions list $13.99 million for 2025 and $13.61 million for 2024. Use the applicable year rather than carrying an old threshold into a new plan. State estate-tax rules and nonresident situations require separate analysis.

Portability can permit a surviving spouse to use a deceased spouse's unused exclusion, but it requires the relevant election and filing process. Do not treat two individual exclusion amounts as automatically available to every married couple. Prior gifts, citizenship, documents, and other facts can change the analysis.

Begin a review with ownership records, prior gift-tax returns, relevant trust documents, beneficiary information, and dated valuations. An adviser needs those facts to evaluate the legal and tax position; a total balance alone is insufficient.

1. Mezzi: prepare the financial questions

Mezzi can organize investments, banking, other assets such as real estate, and liabilities. AI Personalization lets you describe goals and rules around cash flow, investing, and other priorities. This is useful when an estate-planning idea also affects the person's ongoing financial life.

For example, a proposed gift might reduce available cash or require selling investments. Before implementation, you can discuss which resources are available, what reserve you want to preserve, and which assumptions need verification. The financial question is whether the action fits your priorities; the legal and tax questions still require their own analysis.

The account-category overview explains the broader financial view. Available balances and tax lots depend on the connection. An account label, connected balance, or manually maintained property value does not establish legal ownership, estate inclusion, or an appraisal for tax purposes.

Exposure analysis and X-Ray can help inspect relevant investment concentration and overlap where the holdings data supports it. That may inform a conversation about which assets to retain or discuss with an adviser. It does not determine which transfer strategy is legally effective or calculate every estate-tax consequence.

Mezzi pricing includes free access, Advisory at $399 annually, and Concierge at $999 annually. The privacy policy describes data handling and collaborator access; review that scope before sharing family financial information.

Best fit: Someone who wants clearer financial context before a planning discussion. Use professional help for: The taxable-estate determination, document drafting, valuations, filing elections, and implementation. Mezzi should be part of the preparation process rather than presented as an estate-tax compliance engine.

2. FP Alpha: connect documents to an adviser-led review

FP Alpha's Estate Snapshot uses uploaded legal documents to summarize and visualize important elements of an estate plan. Its Estate Planning Lab models alternative arrangements and their projected state and federal estate-tax effects. This is substantive planning functionality beyond an account dashboard.

Current pricing lists the All-in-One offering at $1,995 annually, including 35 tax, ten estate, and ten insurance snapshots. Standalone modules and larger bundles are available. Confirm the selected package, usage definitions, and any additional credits rather than assuming unlimited household reviews.

For a family working with an adviser, the useful demonstration is a traceable comparison: what do the existing documents say, which fact was extracted, and what is being proposed? The review should clearly distinguish an existing arrangement from a hypothetical strategy.

FP Alpha's Estate Lab training specifically encourages separating planning proposals from existing documents and applying professional judgment to the available modeling flexibility. A scenario that the software permits is not proof that the legal action is appropriate or effective.

Ask the adviser to show how a changed beneficiary, ownership interest, or valuation affects the model. If a document has ambiguous language or a later amendment, identify who resolves the issue and which version controls. A summary is useful when the source document remains available for review.

Best fit: An adviser who needs document-driven estate review and scenario conversations alongside the existing planning process. Check closely: Document completeness, source traceability, existing-versus-proposed status, applicable tax assumptions, and the attorney handoff. The software does not execute a trust or transfer an asset merely because the proposed flowchart looks favorable.

3. RightCapital: evaluate estate choices within the financial plan

RightCapital's Estate Analysis models the flow of assets to a surviving spouse and heirs. Its analysis includes federal and state estate-tax projections and permits changes to relevant assumptions and proposed trust strategies. The documented inputs include prior gifts and deceased spousal unused exclusion.

Its planning-module overview also describes estate-document checklists and beneficiary records. These functions can help structure the review, provided they are reconciled to the actual executed documents and institution records.

Pricing is $149.95 per adviser per month for Basic, $209.95 for Premium, and $254.95 for Platinum, with an annual commitment for the first year. Premium adds account aggregation and the Iris AI planning agent among other features. Enterprise terms are available separately; listed assistant access carries an additional fee.

A meaningful evaluation is a comparison in which only one assumption changes. Ask the adviser to show the existing plan, a proposed gift or trust strategy, the projected effect on heirs, and the effect on the client's own financial resources. Verify that changes made in one module affect other relevant parts of the plan as intended.

Planning horizons are assumptions, not predictions of when someone will die. Inflation and future asset growth also influence the projection. The right question is how robust the decision appears under alternative assumptions, not whether the most favorable displayed outcome can be achieved with certainty.

Best fit: An adviser integrating estate analysis with broader retirement, tax, and financial planning. Check closely: Ownership inputs, prior gifts, applicable state rules, planning horizons, and how the software treats beneficiary and probate assumptions. A model should expose those assumptions so the professional can confirm whether they match the household.

4. Hive Tax AI: research and planning ideas for professional review

Hive Tax AI offers separate tax research and planning assistants. Research focuses on tax questions and supporting authority; planning analyzes client circumstances and potential strategies. It is useful to distinguish those tasks from legal-document drafting or filing a completed estate-tax return.

The pricing page lists research for sole practitioners at $799 annually or $79 monthly. Planning is $699 annually for 50 plans, $1,199 for 100, and $3,299 for unlimited plans. Multi-user research arrangements use sales terms. These prices describe software access, not an individual family's complete estate-planning engagement.

For a professional evaluating a proposed estate strategy, test the research with a specific question containing the relevant year, jurisdiction, ownership facts, and prior transfers. Inspect cited authority and ask what facts would change the answer. A broad prompt about “saving estate taxes” is too vague to establish that a particular household qualifies for anything.

The vendor's documentation distinguishes its research-data updates from updates to curated planning strategies. Regardless of update frequency, confirm the controlling rule and effective date for the actual action. Neither a current-looking answer nor a long list of strategies guarantees applicability.

Use the output to prepare a review memo: proposed action, conditions, unresolved facts, source authority, implementation steps, and responsible professional. If estimated savings appear, identify the comparison baseline and include costs, restrictions, and other tax consequences that could affect the decision.

Best fit: A tax professional seeking research support and structured planning ideas. Check closely: Source authority, year and jurisdiction, required facts, privacy terms, and the scope of human review. Do not treat a generated recommendation or vendor case study as an assured result for another client.

Compare a strategy without hiding the trade-offs

A useful estate-planning comparison should explain what changes and what remains under the client's control. The tax result is one part of the decision, alongside liquidity, access, administration, and family intentions.

Consider a simplified liquidity example. A person has $500,000 of available cash, wants to retain $200,000, and expects $100,000 of near-term obligations. That leaves $200,000 before other uncertainties, not $500,000, for the next cash decision. This is not an estate-tax calculation or a recommendation to make a gift; it illustrates why financial context should accompany the tax model.

Keep income-tax and estate-tax effects separate. A strategy described as reducing an estate may create other consequences or reduce flexibility. Ask for the complete comparison and the legal steps needed to make the scenario real.

Frequently asked questions

What is the best AI tool for estate tax planning?

Choose by task. Mezzi supports financial preparation, FP Alpha supports professional document analysis and estate scenarios, RightCapital integrates estate analysis with adviser-led planning, and Hive Tax AI supports tax research and planning ideas. Implementation still requires the appropriate legal and tax work.

What is the federal estate-tax exclusion in 2026?

The IRS lists a $15 million basic exclusion amount for 2026. Filing and tax calculations depend on more than a current net-worth total, including relevant prior gifts and other facts. State rules and nonresident situations require separate review.

Can a married couple automatically use twice the individual exclusion?

Do not assume that. Portability of a deceased spouse's unused exclusion involves an election and filing requirements, and other facts may affect the result. Review the actual household circumstances with the responsible professional.

Does a favorable software scenario mean the estate plan is implemented?

No. Proposed documents, transfers, titles, beneficiary changes, valuations, and filings must be completed through the appropriate process. Keep the modeled proposal separate from the legally effective arrangement.