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Trust & Estate

Trust and Estate Tax CPA: Form 1041, Form 706, Prop 19, and Step-Up in Basis for Bay Area Families

Updated May 2026 · 12 min read

A Bay Area homeowner who dies with a $4 million house, a $2 million stock portfolio, and a family trust that was set up in 1998 leaves behind not one tax problem but several. The estate needs a Form 706 evaluation (does it exceed the federal exemption?), the trust becomes irrevocable and needs Form 1041 fiduciary income tax returns going forward, the step-up in basis on each asset needs to be established and documented, the Proposition 19 implications for any real property being transferred to adult children need to be analyzed, and if the will leaves assets to grandchildren, the generation-skipping transfer tax exposure needs to be evaluated. The executor who tries to navigate this without a CPA who handles trust and estate tax regularly will make expensive mistakes that cannot always be corrected after the fact.

Silicon Valley Tax prepares trust and estate tax returns for Bay Area families from our office at 2051 Junction Ave, San Jose CA 95131. We work alongside estate planning attorneys, trust administrators, and trustees to cover the tax preparation and planning side of the picture. To schedule a free consultation, call (408) 383-9870 or use the online booking form.

Types of Trusts and How They Are Taxed

Not all trusts are taxed the same way. The tax treatment depends on whether the trust is revocable or irrevocable, whether the grantor retains certain powers, who the beneficiaries are, and how income is distributed.

Revocable Living Trusts (Grantor Trusts)

A revocable living trust is the most common estate planning tool in California. The grantor (the person who creates the trust) retains the right to revoke, amend, or change the trust during their lifetime. Because of this retained control, a revocable trust is a grantor trust for income tax purposes under IRC Sections 671-679. All income, deductions, and credits flow directly to the grantor's individual Form 1040. The trust itself does not file a separate income tax return while the grantor is alive.

The revocable trust avoids probate, which in California can be lengthy and expensive for estates above the $184,500 threshold. It does not, however, reduce estate taxes: all assets in a revocable trust are included in the grantor's taxable estate at death.

Irrevocable Trusts

When the grantor dies, a revocable trust becomes irrevocable. At that point, the trust is a separate taxpayer and must file Form 1041 for any year in which it has gross income of $600 or more. The trust's income is taxed at the trust's own tax rate schedule, which compresses rapidly: the 37% federal bracket applies to trust income above $15,650 in 2026, compared to $609,350 for a single individual. This compression creates strong pressure to distribute income to beneficiaries, who are taxed at their individual rates, often lower than the trust's rate.

Income distributed to beneficiaries is reported on Schedule K-1 (Form 1041) and included in the beneficiary's individual return. The trust deducts the distribution against its own income. Income retained in the trust is taxed at the trust's compressed rates. Determining the optimal distribution each year is a planning exercise that depends on the beneficiaries' marginal rates, the trust's income type (ordinary vs. capital gains), and any accumulated income from prior years.

Intentionally Defective Grantor Trusts (IDGTs)

An IDGT is an irrevocable trust that is structured to be a grantor trust for income tax purposes (the grantor pays the income tax) but outside the grantor's estate for estate tax purposes. The "defect" is that the trust contains a power under IRC Section 675 or another grantor trust power that makes the grantor the income tax owner. Because the grantor pays the trust's income tax without that payment being treated as a gift to the trust, the trust's assets can grow without being eroded by income tax, and the estate effectively makes a tax-free gift each year equal to the income taxes paid on the trust's behalf.

IDGTs are commonly paired with a sale of appreciating assets (closely held business interests, concentrated stock, real estate) to the trust in exchange for a promissory note. The sale to an IDGT is not a recognition event for income tax (grantor trust rules treat the grantor and trust as the same taxpayer), but it removes the asset from the taxable estate at the time of sale, with only the note remaining on the estate's balance sheet.

Charitable Remainder Trusts (CRTs)

A CRT (IRC Section 664) allows a donor to transfer appreciated property to an irrevocable charitable trust, receive an immediate partial charitable deduction, receive an income stream (annuity or unitrust payment) for a term or life, and have the remainder pass to charity at the end of the trust term. The CRT sells the appreciated property without paying capital gains tax at the time of sale (the trust is tax-exempt), and the income stream is distributed to the grantor and taxed under a four-tier ordering rule: ordinary income first, then capital gain, then tax-exempt income, then return of basis.

For Bay Area families holding highly appreciated stock or real estate who need liquidity without an immediate full capital gains hit, a CRT can provide a partial solution.

Form 1041: Fiduciary Income Tax Return

Form 1041 is the federal income tax return for estates and trusts. California's companion return is Form 541. The returns are due on April 15 for calendar-year entities (extension to September 30 for trusts, September 15 for estates). Trusts may elect a fiscal year, which provides planning flexibility around the timing of income recognition in the first year.

What Goes on Form 1041

Form 1041 reports the trust or estate's gross income from all sources: interest, dividends, capital gains, rents, royalties, and business income if the trust carries on a trade or business. Deductions include investment advisory fees, trustee fees, attorney and CPA fees related to the trust administration, state income taxes, and the distribution deduction for amounts properly distributable to beneficiaries.

Capital gains in trusts are tricky: they are generally taxable to the trust (not to the beneficiaries) unless the trust instrument specifically authorizes inclusion in distributable net income (DNI), or unless the trustee exercises discretion to include capital gains in DNI. Planning the allocation of capital gains between the trust and the beneficiaries requires reading the trust document carefully and potentially amending the distribution plan to optimize tax outcomes.

The Net Investment Income Tax

The 3.8% net investment income tax (NIIT) under IRC Section 1411 applies to trusts above the trust income threshold ($15,650 in 2026), which is the same amount as the top income tax bracket threshold for trusts. Most trust investment income is subject to NIIT because the compressed bracket means the threshold is reached almost immediately. Distributing investment income to beneficiaries whose MAGI is below $200,000 (single) or $250,000 (married) removes the income from NIIT exposure at the trust level and may eliminate it at the beneficiary level.

Form 706: Federal Estate Tax Return

Form 706 (United States Estate Tax Return) is required when the gross estate (the total value of all property owned or controlled at death, including life insurance, retirement accounts, and property held in trust) exceeds the applicable exclusion amount. For 2026, the exclusion is $13.99 million per person.

Form 706 is due nine months after the date of death, with an automatic six-month extension available (Form 4768). An extension of time to file is not an extension of time to pay; interest on any tax owed accrues from the nine-month due date.

Portability Election

The portability election under IRC Section 2010(c) allows a surviving spouse to inherit the deceased spouse's unused exclusion amount (DSUE). If a decedent used only $6 million of the $13.99 million exemption, the surviving spouse can add the remaining $7.99 million to their own exemption, for a combined effective exemption of $21.98 million on the second death. The portability election is made on a timely filed Form 706, even if no estate tax is owed. A surviving spouse in a Bay Area family should almost always make the portability election regardless of whether the first estate is taxable, because the election costs little and preserves significant flexibility.

Estate Valuation for Bay Area Estates

Bay Area estates commonly include real property, closely held business interests, and concentrated equity positions that require formal valuation. Real property is appraised by a qualified real estate appraiser as of the date of death. Closely held business interests require a business valuation expert applying income, market, and asset approaches. Minority interest discounts and lack of marketability discounts can reduce the estate tax value of closely held interests by 15-35% compared to pro-rata net asset value, which is significant on high-value Bay Area businesses.

Form 709: Gift Tax Return

Form 709 reports taxable gifts made during the calendar year. The annual exclusion for 2026 is $19,000 per recipient. Gifts to any single recipient above $19,000 are taxable gifts, which must be reported on Form 709 and reduce the lifetime exemption dollar for dollar. Form 709 is due April 15 of the year following the gift, with an automatic extension available.

Common gifting strategies for Bay Area high-net-worth families:

Annual exclusion gifts: $19,000 per year per recipient, $38,000 for married couples splitting gifts. A family with four adult children and their spouses can gift $304,000 per year entirely free of gift tax and exclusion usage.
Direct payment of tuition and medical expenses: payments made directly to the educational institution or medical provider are excluded from gift tax entirely, with no annual limit. Grandparents paying private school tuition or college tuition directly can transfer large amounts without gift tax implications.
Front-loading 529 accounts: the five-year election under IRC Section 529(c)(2) allows a lump-sum contribution of up to five times the annual exclusion ($95,000 per beneficiary, $190,000 for married couples) to a 529 college savings account, treated as if made over five years for annual exclusion purposes.
Gifts of LLC interests with discounts: transferring minority interests in a family-owned LLC or limited partnership to heirs, with minority interest and lack of marketability discounts reducing the taxable gift value by 20-40%. This strategy requires a qualified appraisal and careful documentation to withstand IRS scrutiny.

California Proposition 19: What Changed for Inherited Property

Proposition 19, which took effect February 16, 2021, was the most significant change to California property tax rules for inheritors in decades. Before Proposition 19, Proposition 58 (1986) allowed children to inherit their parents' primary residence and up to $1 million of other property without reassessment to current market value. This created enormous inherited property tax savings for Bay Area families, given the gap between assessed values (locked at Proposition 13 rates) and current market values.

Proposition 19 replaced the Proposition 58 exclusion with a much narrower rule:

The parent-child exclusion only applies to a primary residence transfer
The child must use the home as their primary residence within one year of acquisition
The exclusion is limited: only up to $1 million of assessed value difference is excluded from reassessment
Investment property, vacation homes, and commercial property receive no exclusion

Practical impact: a Bay Area family that owns a rental triplex assessed at $600,000 (Proposition 13 base) with a current market value of $4 million faces reassessment to $4 million when the property passes to children, raising property taxes by approximately $40,000 per year immediately. Under pre-Proposition 19 law, the children could have inherited the triplex at the $600,000 assessed value and continued paying based on that base.

Planning options that remain available: inter-vivos transfers during the parent's lifetime (with gift tax analysis), trust structures that delay the change-of-ownership trigger, or sale of the property to the children at a discounted price using an installment sale. Each option has different income, gift, and estate tax consequences, and we model all three before recommending a strategy.

Step-Up in Basis: The Most Powerful Estate Tax Tool

The step-up in basis under IRC Section 1014 is the cornerstone of estate planning for Bay Area families with appreciated assets. When a decedent dies holding appreciated property, the property's tax basis is reset to fair market value at the date of death. All pre-death appreciation is permanently excluded from income tax.

What Qualifies for Step-Up

Property included in the decedent's gross estate for federal estate tax purposes generally receives a step-up in basis. This includes:

Individually owned assets (real estate, stock, personal property)
Community property (in California, both halves of community property receive a step-up at the death of the first spouse)
Assets in a revocable trust (the trust assets are included in the estate)
Jointly held property (50% step-up for non-spousal joint tenants, 100% step-up for spousal community property)

California Community Property Advantage

California is a community property state, and community property receives a particularly favorable step-up rule. When the first spouse dies, both halves of community property receive a step-up to current fair market value, not just the decedent's half. This is dramatically better than common-law states where only the decedent's half gets the step-up. For a Bay Area couple who purchased Apple stock in 1990 as community property, both halves receive the step-up when the first spouse dies, completely eliminating the capital gains tax on decades of appreciation before the surviving spouse sells.

Planning to Maximize Step-Up

The step-up creates planning opportunities around which assets to hold until death versus which to sell during life. Assets with large unrealized gains (appreciated real estate, concentrated tech stock, private company equity) are candidates for retention until death to capture the step-up. Assets with large unrealized losses should generally be sold during life to recognize the loss deduction. This "asset location" strategy can shift millions of dollars of capital gains tax liability entirely.

Generation-Skipping Transfer Tax

The generation-skipping transfer tax (GST) under IRC Chapter 13 applies to transfers that skip a generation, either directly to grandchildren or in trust for their benefit. The GST exemption is the same as the estate and gift tax exemption ($13.99 million in 2026). Transfers in excess of the exemption are taxed at 40%.

Dynasty trusts, which are designed to pass wealth across multiple generations while minimizing estate tax at each generation, rely heavily on allocation of GST exemption at the time of funding. California law limits the duration of trusts, but careful drafting can extend the tax-beneficial period significantly. We prepare GST tax returns and advise on exemption allocation strategies for Bay Area families establishing multi-generational trusts.

Our Trust and Estate Tax Services at a Glance

Form 1041 fiduciary income tax returns for trusts and estates
California Form 541 preparation coordinated with federal
Form 706 federal estate tax return preparation and filing
Form 709 gift tax return preparation
Portability election filing on Form 706
Step-up in basis documentation and estate asset inventory
California Proposition 19 analysis for real property transfers
Trust accounting and Schedule K-1 preparation for beneficiaries
Generation-skipping transfer tax returns and exemption allocation
Charitable remainder trust annual excise tax returns (Form 5227)
Trust administration support: distributable net income calculations, distribution planning, tax projections
Coordination with estate planning attorneys on trust structure and funding

Frequently Asked Questions

When does a trust need to file its own tax return (Form 1041)?

A trust must file Form 1041 when it has gross income of $600 or more, has any taxable income, or has a nonresident alien beneficiary. Revocable living trusts generally do not file their own return while the grantor is alive; all income is reported on the grantor's Form 1040. After the grantor's death, the trust becomes irrevocable and files its own Form 1041 for any year with income above the threshold. The filing deadline is April 15 for calendar-year trusts with an extension to September 30.

What is the estate tax exemption and does California have its own estate tax?

The federal estate tax exemption for 2026 is $13.99 million per individual. A married couple can shelter up to $27.98 million using the portability election. California does not have a separate state estate tax or inheritance tax. For Bay Area families, the federal exemption is the only estate tax threshold that matters. Planning should account for the potential future reduction in the exemption if the current levels are not extended by Congress.

How does step-up in basis work and why does it matter for Bay Area estates?

Under IRC Section 1014, assets inherited from a decedent receive a stepped-up basis equal to fair market value at the date of death. This eliminates all built-in capital gain. For a Bay Area homeowner who bought a house in 1985 for $300,000 and died in 2026 with the home worth $3.5M, heirs inherit a $3.5M basis. If they sell immediately, no capital gains tax is owed on the $3.2M of appreciation. California community property provides an additional advantage: both halves receive the step-up at the first spouse's death.

What are the California Proposition 19 rules for inheriting a parent's home?

Proposition 19, effective February 2021, narrowed the parent-child exclusion from reassessment. The exclusion now applies only to a primary residence, only if the child uses it as their primary residence within one year, and only up to $1 million of assessed value difference. Investment and rental property receive no exclusion. A Bay Area family inheriting a rental property with a $600,000 assessed value and $4M market value faces reassessment and $40,000 more in annual property taxes.

Do I need to file Form 709 for gifts to family members, and what is the annual exclusion?

Form 709 is required when taxable gifts exceed the annual exclusion. The annual exclusion for 2026 is $19,000 per recipient ($38,000 for gift-splitting spouses). Gifts above this amount reduce the lifetime exemption ($13.99 million in 2026). Payments made directly to educational institutions or medical providers are excluded from gift tax entirely with no annual limit. We prepare Form 709 and advise on gifting strategies that maximize transfer efficiency within the exclusion framework.

Why Bay Area Families Choose Silicon Valley Tax for Trust and Estate Tax

Trust and estate returns are not filed every April. They arise when a family member dies, when a trust receives significant income for the first time, or when an estate planning attorney tells a new trustee to find a CPA. These events do not follow the tax season calendar, and we are available year-round to handle them.

Our office is at 2051 Junction Ave, San Jose CA 95131. We work with Bay Area estate planning attorneys and trust administration attorneys as a coordinated team, covering the tax preparation and tax planning side of the picture while the attorneys handle the legal administration. If you are serving as a trustee or executor for the first time and are not sure where to start, we are glad to take a free consultation call. Call (408) 383-9870 or book at contact.html#book.