Glossary term
Credit Shelter Trust (CST)
A credit shelter trust is an estate planning trust designed to use a deceased spouse’s estate tax exemption while benefiting the surviving spouse or heirs.
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What Is a Credit Shelter Trust?
A credit shelter trust is an estate planning trust designed to use the estate tax exemption of the first spouse to die while still allowing the surviving spouse or other beneficiaries to benefit from the assets. It is also called a bypass trust or family trust.
The basic idea is to keep selected assets outside the surviving spouse's taxable estate. The trust can provide income or limited access to principal, but the assets are not owned outright by the surviving spouse if the trust is structured and administered properly.
Key Takeaways
- A credit shelter trust can preserve the first spouse's estate tax exemption.
- The surviving spouse may receive income or limited distributions without owning the assets outright.
- The trust can protect future appreciation from estate tax in the surviving spouse's estate.
- Portability reduced the need for some credit shelter trusts, but it did not eliminate their planning use.
How the Trust Is Funded
At the first spouse's death, the estate plan directs some assets into the trust instead of passing everything outright to the surviving spouse. The amount may be tied to the available exemption, a formula, or a specific dollar amount.
Planning Element | Practical Role |
|---|---|
Deceased spouse's exemption | Can shield assets placed in the trust from estate tax. |
Surviving spouse access | May include income or principal distributions under trust standards. |
Remainder beneficiaries | Often children, grandchildren, or other heirs who receive assets later. |
Trustee oversight | Controls distributions and keeps trust assets separate from outright ownership. |
Portability and Control
Federal portability allows a surviving spouse to use a deceased spouse's unused exclusion if a timely estate tax return election is made. That rule made some credit shelter trust planning less automatic for married couples.
Still, a credit shelter trust can do things portability does not. It can shelter future appreciation, provide asset management, control where assets go after the surviving spouse dies, and protect family-line planning in blended-family or remarriage situations.
Tradeoffs to Understand
A credit shelter trust adds administration. The trustee may need to file tax returns, keep separate records, manage distributions, and follow the trust terms. The income tax basis outcome may also differ from outright ownership, so tax coordination matters.
The trust should be reviewed when exemption amounts, family circumstances, state estate tax rules, or asset values change. A formula drafted years ago may not produce the result a family expects today.
The Bottom Line
A credit shelter trust is a tax and control tool for married-couple estate planning. It can preserve exemption and direct future ownership, but it needs careful drafting, funding, and administration to fit the family's actual goals.