The transfer-tax engine. When the trust is funded, the donor makes two transfers at once: a charitable interest, which qualifies for the gift tax charitable deduction under section 2522(c)(2)(B), and a remainder interest to the family, which does not. The remainder is a completed taxable gift measured at that moment, using the section 7520 valuation rules, so its value is whatever the trust is worth minus the present value of the charitable stream. Everything the assets earn after that point passes to the remainder beneficiaries without any further gift or estate tax, because the gift has already been made and valued. That is the whole idea: the donor fixes the transfer-tax cost of a future inheritance at today's number and gives the charity the intervening years.
The arithmetic is sensitive to the section 7520 rate, which is published monthly and which this page deliberately does not quote. The direction is what a reader needs: a lower rate makes the charitable stream worth more and therefore the taxable remainder worth less, so these trusts are discussed most when rates are low. A longer term and a larger annual payment do the same thing. None of that changes the tax treatment; it changes the size of the gift reported on the return.
The grantor fork, which is the decision that actually gets made. Revenue Procedure 2007-45's annotations say that an inter vivos charitable lead trust "may be established as either a grantor charitable lead trust or a nongrantor charitable lead trust." Its scope section names the same split and adds: "The income tax consequences are different for each."
A nongrantor trust is a separate taxpayer. It is allowed a deduction under section 642(c)(1) for gross income it pays out for charitable purposes, and the revenue procedure notes that deduction is available "without limitation," which is a real advantage over an individual's percentage-limited charitable deduction. The trade is stated in the same document: "Generally, the donor is not entitled to any income tax charitable deduction." The donor gets the transfer-tax benefit and no income tax deduction at all.
A grantor trust runs the other way. The donor takes an income tax charitable deduction in the year of funding for the present value of the charitable stream, and then is taxed personally on all of the trust's income for the whole term, including the income used to make the charitable payments the deduction was given for. Section 170(f)(2)(B) makes both halves conditional on each other: no deduction is allowed for a non-remainder interest transferred in trust "unless the interest is in the form of a guaranteed annuity or the trust instrument specifies that the interest is a fixed percentage distributed yearly of the fair market value of the trust property (to be determined yearly) and the grantor is treated as the owner of such interest for purposes of applying section 671." So the upfront deduction is only ever available where the donor accepts the income tax exposure.
The recapture clause, which is the part people forget. The same subsection provides that "if the donor ceases to be treated as the owner of such an interest ... the donor shall ... be considered as having received an amount of income equal to the amount of any deduction he received under this section for the contribution reduced by the discounted value of all amounts of income earned by the trust and taxable to him before the time at which he ceases to be treated as the owner of the interest." In plain terms, a donor who takes the upfront deduction and then stops being taxed on the trust's income, whether by releasing a power or by dying during the term, recognizes income to unwind the benefit they have not yet paid for. Section 170(f)(2)(C) closes the other route, denying any further deduction to the grantor or anyone else for the contributions the trust itself makes with respect to that interest, so the charitable payments cannot be deducted twice.
The estate-tax question, and the way it is usually stated backwards. The attraction of the structure is that the remainder is a completed gift at funding, so post-funding appreciation is outside the donor's transfer-tax base. That result depends on the donor keeping nothing. Revenue Procedure 2007-45's own annotations warn about the commonest way it is lost: if the donor serves as trustee with the power to select the charitable beneficiaries, the gift of the charitable interest is incomplete for gift tax purposes and the annotation notes it "may cause some or all of the trust property (depending on the date of the donor's death) to be included in the donor's gross estate," citing sections 2035(a), 2036(a)(2) and 2038(a)(1). It flags a second version: where the charitable beneficiary is a private foundation and the donor is an officer or director of it or holds certain decision-making authority there, some or all of the trust property "may be included in the donor's gross estate" under section 2036(a)(2). So the correct statement is not that a charitable lead trust is automatically out of the estate. It is that a completed gift with no retained powers is out, and retained control over who receives the charity's money is the specific thing that pulls it back.
What can go wrong on the investment side. A charitable lead annuity trust owes a fixed dollar amount each year whatever the assets do. In a bad stretch those payments come out of principal, and a trust that underperforms the section 7520 rate assumed at funding can hand the family very little, or nothing, after twenty years of payments the donor cannot get back. A unitrust form is gentler, because the payment falls with the assets, but it also transfers less when the assets do well. Neither version can be unwound.
