Estate and gift tax: Claude skills backed by tested code

Analysis only. No tool in this server places orders, modifies custodian records or files returns. This server holds no client data: every figure arrives in the call and nothing is stored. Results are estimates over those figures, not a return and not tax advice. The compressed fiduciary brackets and the unified credit are computed; what belongs in the gross estate, and what it is worth, are not.

What taxagent-estate computes

4 commands, every one callable over MCP. Every result carries the method it used, the rule pack it was pinned to, what is still missing and whether coverage was complete, for a licensed professional to review.

CommandWhat it returnsWhat it needs
calculate_estate_taxTaxable estate and lifetime gifts against the unified credit, with the section 2001(c) schedule.nothing required
calculate_gift_exclusionHow much of a gift the annual exclusion covers, with splitting and the separate figure for a non-citizen spouse.nothing required
calculate_fiduciary_taxThe compressed fiduciary brackets, which reach the top rate at $16,000.nothing required
get_estate_capabilitiesWhich calculators taxagent-estate exposes, what it will not compute, and the rule pack its figures are pinned to.nothing required

When to use it

Federal estate tax, gift exclusions and fiduciary income tax. It holds no client data: every figure arrives in the call and nothing is stored.

Requests it answers:

  • “How much federal estate tax would be due?”
  • “How much can I give before a gift return is due?”
  • “What tax does a trust pay on income it keeps?”
  • “What estate and gift tax does this server cover?”

Skills that route here, each with the moment it applies:

estate-review

Someone wants to know what federal estate tax an estate would owe, or how lifetime gifts and portability change it.

Estimate federal estate tax against the unified credit, including the effect of lifetime gifts and a deceased spouse's unused exclusion. Use when someone asks what an estate would owe. Never values property and never decides what is in the gross estate.

gift-planning

Someone wants to know how much they can give without using lifetime exclusion, or what part of a planned gift is taxable.

Work out how much of a gift the annual exclusion covers, including gift splitting between spouses and the separate figure for a non-citizen spouse. Use for annual gifting questions. Produces an exclusion calculation, not a recommendation to give.

What it does not do

Named here because leaving it out is how an agent ends up asserting something the code never computed. Each line is the registry's own wording, not a summary of it.

  • Whether property belongs in the gross estate, and what a closely held interest is worth. Both are facts, and both change the answer more than the rate schedule does.
  • Generation-skipping transfer tax, and valuation discounts.
  • State estate and inheritance taxes, which several states impose at far lower thresholds than the federal exclusion.
  • Whether a portability election was made: a deceased spouse's unused exclusion is taken as given.

Where the figures come from

6 rules in the pack this server reads, each carrying its authority and legal effective date. The engines read from the pack, and a constant reappearing in the calculation path fails the build.

RuleAuthority
annual_gift_exclusionIRC 2503(b); Rev. Proc. 2025-32 sec. 4.42(1)
basic_exclusion_amountIRC 2010(c)(3); OBBBA sec. 70106; Rev. Proc. 2025-32 sec. 3.41
estate_gift_rate_scheduleIRC 2001(c)
fiduciary_bracketsIRC 1(e), 1(j)(2)(E); Rev. Proc. 2025-32 Table 5
fiduciary_capital_gain_bracketsIRC 1(h), 1(j)(5); Rev. Proc. 2025-32 sec. 3.03
noncitizen_spouse_gift_exclusionIRC 2523(i)(2); Rev. Proc. 2025-32 sec. 4.42(2)

Scripted case coverage

7 of the 71 console cases call this server over JSON-RPC on every build, across 1 of the 15 client objectives the case inventory groups by: Transfer wealth.

CaseWhat it asksWhat it showsOutcome
estate-within-exclusionAn estate under the exclusionNo federal estate tax at $12m against a $15m exclusion. A return may still be due, and several states tax far lower estates.completed
estate-gifts-added-backLifetime gifts are added back, not subtracted$2m of prior gifts does not simply shrink the estate: it is added to it before the rate schedule, so it pushes the estate into higher brackets.completed
estate-portabilityA deceased spouse's unused exclusionDoubles the shelter to $30m. Taken as given: portability needs a timely return on the first death, which this server cannot check.completed
estate-gift-splittingTwo parents, three children$19,000 times three recipients times two donors shelters $114,000. Splitting needs both spouses to consent on a return.completed
estate-noncitizen-spouseA gift to a non-citizen spouseThe unlimited marital deduction does not apply, so a separate and much larger annual figure governs instead of the ordinary $19,000.completed
estate-splitting-refused-for-spouse-giftSplitting a gift to your own spouse is refusedThe non-citizen spouse figure applies to one donor and one spouse. Multiplying it would invent an exclusion that does not exist.VALIDATION_FAILED
estate-fiduciary-compressionA trust hits the top rate at $16,000The compression that drives most distribution planning: an individual reaches 37% in the hundreds of thousands, a trust at $16,000.completed

Questions it answers

How much federal estate tax would be due?

Taxable estate and lifetime gifts against the unified credit, with the section 2001(c) schedule. Nothing is required to start: every input has a declared default the result reports. Call calculate_estate_tax on taxagent-estate over MCP. Every result carries the method it used, the rule pack it was pinned to, what is still missing and whether coverage was complete, for a licensed professional to review.

How much can I give before a gift return is due?

How much of a gift the annual exclusion covers, with splitting and the separate figure for a non-citizen spouse. Nothing is required to start: every input has a declared default the result reports. Call calculate_gift_exclusion on taxagent-estate over MCP. Every result carries the method it used, the rule pack it was pinned to, what is still missing and whether coverage was complete, for a licensed professional to review.

What tax does a trust pay on income it keeps?

The compressed fiduciary brackets, which reach the top rate at $16,000. Nothing is required to start: every input has a declared default the result reports. Call calculate_fiduciary_tax on taxagent-estate over MCP. Every result carries the method it used, the rule pack it was pinned to, what is still missing and whether coverage was complete, for a licensed professional to review.

What estate and gift tax does this server cover?

Which calculators taxagent-estate exposes, what it will not compute, and the rule pack its figures are pinned to. Nothing is required to start: every input has a declared default the result reports. Call get_estate_capabilities on taxagent-estate over MCP. Every result carries the method it used, the rule pack it was pinned to, what is still missing and whether coverage was complete, for a licensed professional to review.

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