Joint bank accounts can be subject to inheritance tax, but for most people the answer at the federal level is no. The 2026 federal estate tax exemption is $15 million per person, so a joint account will only generate federal tax if the deceased owner’s total estate exceeds that threshold.1Internal Revenue Service. What’s New – Estate and Gift Tax The real risk for most surviving co-owners is state inheritance tax, which five states still impose and which is charged to the person receiving the money, not the estate.
Why the Federal Rule Rarely Bites
Federal law starts from a strict presumption. When one owner of a joint account with right of survivorship dies, the IRS treats the entire balance as belonging to the deceased person’s estate. The surviving owner has to prove otherwise by documenting how much they personally contributed.2Office of the Law Revision Counsel. 26 USC 2040 – Joint Interests If you can show you deposited 40% of the funds from your own earnings, that 40% is excluded from the estate. The remaining 60% stays in.3eCFR. 26 CFR 20.2040-1 – Joint Interests
There is a catch worth knowing about. Money the surviving owner received as a gift from the deceased person doesn’t count as the survivor’s own contribution. If a parent deposited $200,000, then gifted $50,000 of it to their adult child co-owner, and the child put that money back into the same account, the IRS still treats the parent as having funded the full balance.2Office of the Law Revision Counsel. 26 USC 2040 – Joint Interests Only money traceable to the survivor’s independent income or wealth qualifies.
None of this matters if the total estate is below $15 million. The full balance can be included on paper and still produce zero federal tax. The contribution test only becomes urgent for estates large enough to owe.
Spouses Get a Different Rule
When spouses are the only two owners of a joint account, the IRS automatically includes exactly 50% of the balance in the estate of the first spouse to die, regardless of who put the money in.2Office of the Law Revision Counsel. 26 USC 2040 – Joint Interests That 50% almost never generates actual tax, because the unlimited marital deduction lets any amount pass tax-free to a surviving spouse who is a U.S. citizen.4Office of the Law Revision Counsel. 26 USC 2056 – Bequests to Surviving Spouse
If the surviving spouse is not a U.S. citizen, the marital deduction is disallowed and the automatic 50/50 split no longer applies. The full contribution test kicks in, and the non-citizen spouse has to prove their own share to exclude any portion.4Office of the Law Revision Counsel. 26 USC 2056 – Bequests to Surviving Spouse This is one of the more overlooked pitfalls in mixed-citizenship marriages.
Parent-Child and “Convenience” Accounts
Adult children added to a parent’s account so they can help pay bills are a common setup and a common source of surprise. If the parent funded the entire account and the child was added only for access, 100% of the balance is included in the parent’s gross estate at death.3eCFR. 26 CFR 20.2040-1 – Joint Interests The child’s name on the account doesn’t change the analysis. Tax authorities look past the legal title to see who actually put the money in.
The account still transfers to the child automatically through survivorship rights. But if the estate ends up owing tax and doesn’t have enough other assets to cover it, the executor can seek contribution from the child. Receiving the money outside probate is not the same as receiving it outside the tax system.
Payable-on-death designations produce the same result. A POD account skips probate, but the full balance is still included in the deceased owner’s estate for tax purposes because the owner controlled the funds until death. Probate and taxation are separate questions.
The Five States That Charge Inheritance Tax
Federal estate tax is only half the picture, and for most families it’s the smaller half. Five states impose a separate inheritance tax. Unlike estate tax, inheritance tax is paid by the person receiving the assets, and the rate depends almost entirely on how closely that person was related to the deceased owner.
In these states, a surviving spouse who receives a joint account through survivorship typically pays nothing. Children and other direct descendants generally face low rates, often in the range of 0% to about 4.5%. Transfers to siblings tend to land in the 10% to 12% range. A joint account passing to an unrelated person or distant relative can be taxed at rates reaching 15% or 16%, depending on the state.
State inheritance tax ignores the federal contribution test. The state doesn’t care who deposited the money. It cares who received it and how closely related they were to the person who died. A parent who adds an unrelated caregiver to a joint account may leave that caregiver facing the highest inheritance tax bracket in the state, even though nothing about the federal calculation would be a problem.
The state where the deceased person lived at death controls whether any inheritance tax applies. And the surviving account holder, not the estate, is personally responsible for paying it.
A Note on Gift Tax During the Owner’s Lifetime
Adding someone to your account does not itself trigger gift tax, because the depositing owner can still withdraw all the funds without permission. The taxable event happens later, when the co-owner takes money out for their own benefit.5GovInfo. 26 CFR 25.2511-1 – Transfers in General If the co-owner pulls out more than $19,000 in a single year (the 2026 annual gift tax exclusion), the depositing owner must file a gift tax return on Form 709.1Internal Revenue Service. What’s New – Estate and Gift Tax
Filing the return doesn’t necessarily mean owing tax, since the excess applies against the lifetime gift and estate tax exemption. But it does mean the IRS is tracking the transfer.6Internal Revenue Service. Instructions for Form 709 Between lifetime withdrawals treated as gifts and death-time transfers pulled into the estate, one part of the system or the other will usually see the money.
Tenancy in Common Works Differently
Everything above assumes a joint account with right of survivorship. If two people hold an account as tenants in common instead, each owns a distinct fractional share, and the deceased owner’s share passes through their will rather than automatically to the co-owner. The IRS includes only the decedent’s fractional share in the estate, regardless of who contributed what.7Office of the Law Revision Counsel. 26 USC 2033 – Property in Which the Decedent Had an Interest Legal ownership percentage controls, which is the opposite of the survivorship rule.
What the Surviving Owner Should Do
Get a certified copy of the death certificate and take it to the bank. The bank handles the survivorship transfer of the title. That is an administrative step, not a tax filing.
Find out where the deceased person was legally resident at death. If it’s one of the five inheritance tax states, you may owe state tax based on your relationship to the person who died, and the bill is yours to pay.
Pull together whatever records you can find showing who deposited money into the account and when. If the total estate might approach the $15 million federal exemption, or if the state uses its own contribution test for estate tax purposes, the executor will need that paper trail. Without deposit slips, bank statements, and transfer records, the default assumption is that the deceased person funded everything.