An elderly mother in Brooklyn adds her eldest son to her checking account. It’s a practical step—he can help pay her bills, manage deposits, and handle day-to-day finances. She tells her other two children, “When I’m gone, I want everything split three ways, just like it says in my will.” They all nod. It seems simple enough. But when she passes away, the eldest son withdraws the entire remaining balance of $150,000, claiming it’s his alone. The other siblings are left stunned, facing a potential fight in Surrogate’s Court.
This is a scenario I have seen play out far too many times. Families are torn apart not by malice, but by a misunderstanding of how New York law treats jointly held assets. The common belief is that a will controls everything. In reality, the way an asset is titled can often override whatever your will dictates.
The Presumption of Survivorship Under New York Law
In New York, the law governing joint bank accounts is direct. New York Banking Law § 675 establishes a powerful legal presumption: when two or more people open a bank account in their joint names, it is presumed to be a “joint tenancy with right of survivorship.” This means that upon the death of one account holder, the entire balance automatically passes to the surviving account holder. The money does not become part of the deceased’s probate estate and is not distributed according to the terms of their will.
For the bank, the matter is settled. Upon receiving a death certificate, they will transfer ownership to the survivor without question. From their perspective, the contract they have with their depositors is clear. The surviving joint owner now has full and sole access to the funds.
This statutory shortcut is intentional. It is designed to provide immediate liquidity to a survivor—often a spouse—without waiting for the probate process, which can take months. This efficiency, however, comes with a significant risk. The law’s presumption about your intent may not match your actual intent.
Challenging the Right of Survivorship
The key to understanding Banking Law § 675 is that it creates a rebuttable presumption. It is the default legal conclusion, not an absolute one. An heir or the executor of the estate can challenge the survivor’s claim to the funds in Surrogate’s Court. The burden of proof, however, is high.
To overcome the presumption, the challenger must provide clear and convincing evidence that the joint account was not intended as a true joint tenancy. In my practice, these challenges generally fall into two categories.
1. The “Convenience Only” Account
This is the most common challenge. The argument, as in the opening story, is that the deceased person added a second name to the account purely for convenience—to allow a child or caregiver to help manage finances. There was never an intention to gift the entire account balance to that person upon death.
To prove this, we would look for evidence such as:
- Who deposited funds into the account? If only the deceased contributed money, it supports the convenience argument.
- How were the funds used? If the surviving joint owner only ever wrote checks for the deceased’s bills and never for personal use, that suggests a custodial role.
- Was there other testimony or writing confirming the deceased’s intent? Conversations with other family members, friends, or advisors can be powerful evidence.
Without this kind of proof, the court will likely uphold the statutory presumption, and the funds will remain with the survivor.
2. Undue Influence or Lack of Capacity
A more serious challenge claims the joint account was created under improper circumstances. This could happen if the deceased was not mentally competent when adding the other owner or was subjected to undue influence—meaning they were coerced or manipulated into the decision.
Proving undue influence requires showing that a confidential relationship was exploited. For example, a caregiver who isolates an elderly person from their family and then suddenly appears on their bank accounts would raise serious red flags for the court. These cases are difficult and require a thorough examination of medical records and testimony about the deceased’s state of mind.
Intentional Planning is Better Than a Legal Default
Using a joint bank account as a primary tool for transferring wealth is a gamble. You are relying on a legal presumption to do the work of a deliberate estate plan. It is a fragile strategy that invites conflict and misunderstanding among the people you care about most.
A well-drafted estate plan provides clarity. A will directs the distribution of your probate assets. A trust can manage those same funds with far more nuance—holding them for a minor grandchild, protecting them from a beneficiary’s creditors, or providing for a loved one with special needs. These tools express your specific intent, leaving no room for a court to guess what you wanted.
Stewardship. That is the goal. It is about creating a clear, intentional plan that honors your legacy and preserves family harmony. Joint accounts have a purpose, particularly for married couples, but they are a poor substitute for a thoughtful estate plan.
If you use joint accounts to manage your assets or as part of your inheritance plan, it is prudent to confirm the titling of those assets aligns with your will. The first step is a review of your asset titling to ensure your financial structure accurately reflects your final wishes.
