Community Property Basis Adjustment at a Spouse’s Death

When a spouse dies owning qualifying community property, federal law generally adjusts the basis of the entire community property to its fair market value at death, including the surviving spouse’s half. At least half of the community interest must be includible in the decedent’s gross estate. This can differ sharply from jointly owned property in a common-law state, where the survivor’s original half generally retains its basis.

Identify community property before applying basis rules

Community property status depends on state law and the couple’s domicile, when and how the asset was acquired, and whether the property is separate or community. In general, earnings and assets acquired during marriage while domiciled in a community property state may be community property, while premarital property, inheritances, and gifts received separately may remain separate. Commingling and title alone do not always settle classification. State law and records determine which half belongs to each spouse.

Community property states include Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin, with rules that vary. Some states recognize community property trusts or other elective arrangements. A couple that moved between states may need to trace where assets were acquired and what law applied. Keep deeds, account registrations, gift and inheritance documents, tax returns, and records showing the source of funds.

The basis adjustment at death

If qualifying community property is included in the decedent’s gross estate to the required extent, the basis of the entire community asset generally becomes its fair market value at the decedent’s death. That means both the decedent’s half and the survivor’s half may receive an adjustment. If the asset has appreciated, this can eliminate built-in gain on the pre-death appreciation for income tax purposes. If the asset has declined, basis may step down to fair market value instead.

Example: spouses own community property with an adjusted basis of $80,000 and fair market value of $100,000 when one spouse dies. If the rule applies, each half generally receives a $50,000 basis. The survivor’s basis changes from $40,000 to $50,000, and the heirs’ half also has a $50,000 basis. If the entire property is later sold for $110,000, the general gain computation starts with the combined $100,000 adjusted basis, subject to selling costs and later adjustments.

Compare with joint tenancy and tenancy by the entirety

For qualified joint interests held by married individuals, federal estate tax law generally includes one-half of the value in the decedent’s gross estate, regardless of contribution amounts. The survivor’s basis is generally the cost of their own half plus the basis of the half inherited from the decedent, with appropriate adjustments. That often produces a one-half basis adjustment rather than the community-property treatment that can adjust the entire community asset.

Do not assume that joint title creates community property or that a community property asset receives a full adjustment just because spouses co-own it. The couple’s domicile, source of funds, state property characterization, and estate inclusion matter. A transfer into a revocable trust may not change beneficial ownership for these purposes, but the trust and title records should be checked. The tax basis answer and probate title answer can be different questions.

Apply the gross-estate inclusion condition

At least half the value of the community property interest must generally be includible in the deceased spouse’s gross estate for the special basis rule to apply. This does not mean the estate must owe estate tax or even file a Form 706; gross-estate inclusion and estate-tax liability are separate. The property’s fair market value, ownership status, and applicable valuation date need documentation. Special rules can apply to property subject to a trust, debt, or prior transfer.

The executor or survivor should establish fair market value as of the date of death, using statements, appraisals, comparable sales, and asset-specific records. Publicly traded securities can often be valued from market data, while closely held businesses and real estate may require appraisal. The date-of-death value is not always the amount eventually realized in a later sale. Keep the valuation records with the basis schedule for the survivor and beneficiaries.

Track adjusted basis after the date of death

A basis adjustment does not freeze basis forever. Subsequent capital improvements can increase basis, depreciation can decrease it, and distributions or casualty events may also affect the amount. For investment accounts, track the date-of-death value security by security where needed. For real estate, separate land and improvements for depreciation if held for rental or business use. Beneficiaries need the correct basis information when inherited property is later sold.

If the property is sold soon after death, the difference between fair market value and sale proceeds may be small, but transaction costs and market movement still matter. If a survivor sells only part of an asset, allocate basis consistently. A charitable gift, exchange, or later transfer may invoke its own basis rule. The death-related adjustment should be entered into a durable basis record, not left only in an executor’s working file.

Planning consequences and limitations

The possibility of adjusting the survivor’s half can influence decisions about titling appreciated assets in a community property arrangement. However, changing title solely for income-tax basis can affect creditor rights, control, estate administration, divorce property rights, and eligibility for other benefits. A basis advantage should be weighed against the family’s ownership goals and state law. Community-property systems also affect income reporting while both spouses are alive.

A step-up is not a universal federal rule that applies to every asset at death. Retirement accounts generally do not receive a basis adjustment like capital assets, and income in respect of a decedent has separate rules. Life insurance proceeds, jointly owned property, trust assets, and gifts made shortly before death all require their own analysis. Identify the asset tax character before assuming that its value reset will eliminate future tax.

Common errors and exam method

Common errors include treating community property like ordinary joint tenancy, assuming every spouse-owned account gets a full adjustment, overlooking separate-property tracing, and confusing gross-estate inclusion with estate tax due. Another error is using the estate’s total value as basis rather than valuing each asset and tracking subsequent changes.

For an exam problem, identify the state-property classification, determine whether the asset is community or separate, test whether at least half is included in the gross estate, value the asset at death, and adjust the basis of the appropriate ownership interests. Then consider later depreciation, improvements, sale costs, and any asset-specific exception.

Practical planning checkpoint

The rule can change the economics of an asset sale shortly after death. Suppose a surviving spouse keeps appreciated community real estate instead of selling it immediately; a documented adjustment may reduce gain when it is eventually sold, but later depreciation and capital improvements must be tracked separately. If the asset was the decedent’s separate property or was only partly community property, only the properly characterized interests receive the corresponding basis treatment. Have counsel reconcile title, marital-property agreements, and tracing records.