Many parents open starter checking or savings accounts with their children to simplify money transfers or monitor spending. That’s understandable while a child is under 18. But after that, a joint setup can create serious financial issues.

Joint accounts make every listed person an equal owner. If one person is sued, faces garnishment, or owes taxes, creditors can access the account - even if the funds belong to the other person (remember, the government doesn't really know who's funds are who's inside of these accounts).

If a parent runs into legal or financial trouble, their adult child’s savings could be frozen. The reverse is also true: if a young adult makes an error or is flagged for fraud, a parent’s banking record could be damaged.

And finally, in old age, parents can ruin estate planning by adding children as joint owners versus using other tools.

What Happens When A Child Turns 18

Turning 18 changes the legal and financial relationship between parent and child. At that age, the child can open and control their own bank account. Keeping a joint account removes privacy, can cause FAFSA issues, and ties each person’s banking history to the other’s.

Creating a separate account gives young adults full control over their finances and helps build a banking and credit history in their own name. Parents can still send money instantly using tools like CashApp, Zelle, Venmo, or automatic transfers—without remaining an account co-owner.

For parents, this separation also prevents unintended fallout from a child’s actions. If an adult child overdraws or triggers a fraud review (as seen in the infamous Chase glitch) both names on the account could be flagged in systems like ChexSystems, making it difficult to open future bank accounts.

How Shared And Joint Accounts Can Negatively Impact FAFSA And Financial Aid

The FAFSA distinguishes between student assets and parent assets, and that distinction has real financial consequences.

Student-owned assets are assessed at a higher rate (up to 20%) while parent assets are assessed at around 5.64%. When a joint account includes the student’s name, the FAFSA may treat the full balance as the student’s unless documentation clearly shows that the money belongs to the parent.

For example, if a joint account holds $10,000, FAFSA could count it as a $2,000 reduction in aid eligibility, compared with roughly $564 if it were considered a parent asset.

Even if the account was meant for convenience, shared ownership can complicate verification and slow down financial aid processing. In some cases, financial aid officers require extra paperwork or may reduce the student’s award based on the account’s total balance.

Estate Planning Mistakes That Backfire

Parents sometimes add adult children to bank accounts, investment accounts, or home titles to make estate planning easier or to allow help with bills. Unfortunately, this move often causes more harm than good.

FAFSA Impact

Adding a person to an account or property changes ownership in a way that can make the asset appear as the student’s. That inflated balance can lower eligibility for need-based financial aid, even if the child never contributed to the account.

For example, if your parents add you to their home, this second home would be considered an asset for FAFSA - which could significantly impact your Student Aid Index.

Tax Consequences

Joint ownership can also erase the step-up in cost basis that heirs normally receive when an asset is inherited. Under the step-up rule, the cost basis resets to the asset’s fair market value at the time of the parent’s death, minimizing capital gains taxes. But if a child is added to the title during the parent’s lifetime, they inherit the original cost basis, potentially leading to a much larger tax bill when the asset is sold.

Exposure to Creditors

Joint ownership makes assets vulnerable to the child’s financial problems. If the child faces a lawsuit, divorce, or debt collection, their share of the jointly held property can be targeted.

Better Alternatives

Parents looking to simplify inheritance can instead use transfer-on-death (TOD) or payable-on-death (POD) designations on accounts, or establish a revocable living trust. These options avoid probate, maintain tax advantages, and keep assets separate for FAFSA purposes.

The Right Way For Adult Children To Help Manage Finances

Parents often reach a point where they want their adult children to help manage bills or handle banking if health declines. The solution is not to add the child as a co-owner. The correct and legally sound approach is to use a Power of Attorney (POA).

A financial power of attorney allows the parent to authorize their child to access and manage accounts on their behalf—without giving up ownership. The parent retains full control and all tax and estate benefits, while the adult child can pay bills, move funds, or make transactions if needed.

Most banks accept durable or limited POAs, and some offer their own internal authorization forms for account access. This arrangement prevents the child’s creditors or FAFSA from treating the funds as the child’s, while still ensuring the parent gets the help they need.

This setup also preserves the step-up in basis and avoids unintended legal exposure, while still keeping the family’s finances manageable as parents age.

How To Make The Transition

Just like other planning that you need to do as your child graduates high school, transitioning banking is simply another item to accomplish.

1. Open separate accounts when the child turns 18.
2. Transfer funds and close any remaining joint accounts.
3. Update direct deposits and payments to the correct account.
4. Use transfer tools like CashApp or Venmo instead of shared access.
5. Document account ownership for FAFSA.
6. For aging parents: Grant financial power of attorney rather than adding children as co-owners.
7. Consider estate designations such as TOD or POD accounts to simplify inheritance.

Bottom Line

Keeping joint accounts after a child turns 18 (or adding adult children to assets later in life) can create legal, financial aid, and tax problems that families don’t anticipate. Separation of accounts protects both generations, preserves aid eligibility, and avoids costly estate planning errors.

If parents need help managing finances, a power of attorney offers the same access and support—without the risks of shared ownership.

Don't Miss These Other Stories: