The basic rule: you report your share of the interest

A joint savings account earns interest, and that interest is taxable income. The bank reports it to the IRS on a Form 1099-INT, and you and the other account owner split the tax responsibility based on who actually owns what portion of the money.

The simplest case: you and another person each own half the account. The bank will report half the interest to you and half to the other person. You report your half on your tax return; they report theirs on theirs. Each of you pays income tax on only the interest you're responsible for.

The more complex case: one person put in all the money, but the account is registered as joint. The IRS still expects the person who actually owns the money to report all the interest, even though the account is in both names. This is where joint accounts can create confusion at tax time.

Key Takeaways

  • Interest earned in a joint account is reported to the IRS on a Form 1099-INT, and you report only the portion that corresponds to your ownership share.
  • The bank typically splits the reported interest 50/50 between account owners unless you provide written instructions showing a different split.
  • If one person owns all the money but the account is joint, that person is responsible for reporting all the interest, not the co-owner.
  • The person whose Social Security number appears first on the account usually receives the full 1099-INT, so you may need to file an amended return or provide documentation to correct the split.

How the bank reports interest to the IRS

When your joint account earns interest, the bank generates a Form 1099-INT showing the total amount. The bank must send this form to the IRS and to at least one of the account owners—usually the person listed first on the account.

If the account is registered as 50/50 joint ownership with no other instructions, the bank will typically report half the interest under one owner's Social Security number and half under the other's. But this doesn't always happen automatically. Some banks report the full amount to the first-listed owner and nothing to the second, leaving it to you to sort out on your tax return.

You can ask your bank in writing to split the reported interest a specific way. Provide a letter stating the percentage each owner should receive, sign it, and keep a copy. The bank may ask for this before the year ends so they can report it correctly to the IRS. If you don't do this and the bank reports it all to one person, that person will need to file an amended return or attach a statement to their return explaining the actual split.

When one person owns all the money

A joint account doesn't change who actually owns the money inside it. If you opened the account with your own funds and added a family member's name for convenience—so they can help manage it or access it if something happens to you—you are still the owner for tax purposes.

The person who owns the money reports all the interest, regardless of whose name is on the account. This is true even if the co-owner is the one who withdrew money or managed the account. The IRS looks at who put the money in, not whose name appears on the paperwork.

This matters because if the bank reports the interest to the wrong person, that person will receive a 1099-INT they shouldn't have. They'll need to report it, and the actual owner will need to correct their own return. It's easier to prevent this by telling the bank in advance who the real owner is and asking them to report accordingly.

What happens if the 1099-INT is wrong

If the bank reported interest to the wrong person, or split it incorrectly, you have options. The person who received the incorrect 1099-INT should file an amended return (Form 1040-X) to remove the interest they shouldn't have reported. The actual owner should file an amended return to add the interest they should have reported.

You don't need the bank to issue a corrected 1099-INT before you file. You can file your return showing the correct amount and attach a statement explaining why it differs from the 1099-INT. Write a straightforward note: "Interest reported on 1099-INT issued by [bank name] on [date] was split incorrectly. My actual ownership share is [amount]." Include documentation if you have it—a letter from the bank, a copy of your written instructions, or a statement of account showing the source of the funds.

If you discover the error after filing, file Form 1040-X as soon as you can. The IRS processes amended returns, though it takes longer than original returns. If you owe additional tax, you'll owe interest on the unpaid amount from the original due date.

Interest on joint accounts with minors

If the joint account owner is a minor, the interest is still taxable income to that child. A parent or guardian doesn't report the child's interest on their own return; the child reports it on theirs (or the parent files on their behalf if the child is too young to file).

There's a tax rule called the "kiddie tax" that affects children under a certain age whose unearned income (like interest) exceeds a threshold. The details vary by year and depend on the child's age and other income. If you have a joint account with a minor, ask a tax professional or check the IRS website for the current year's rules, because the tax treatment may be different from a regular joint account between adults.

Reporting interest on your tax return

You report interest income on Schedule B (Interest and Ordinary Dividends) if your total interest for the year is more than $1,500. If it's $1,500 or less, you can report it directly on Form 1040, line 2b. Either way, the interest from your joint account goes in the same place as interest from any other source.

Write down the name and account number of the bank, the amount of interest, and your ownership share. If the 1099-INT shows a different amount than what you're reporting, attach a statement explaining why. Keep copies of any written instructions you gave the bank, letters from the bank confirming the split, or other documentation that shows your actual ownership percentage.

State income tax on joint account interest

Most states tax interest income the same way the federal government does: you report your share. Some states have different rules for joint accounts or different tax rates, so the amount you owe in state tax may not match your federal tax.

If you live in a state with income tax and have a joint account, check your state's tax instructions or ask a tax professional about how to report it. A few states have no income tax at all, so if you live in one of those, you only worry about federal tax.

Frequently Asked Questions

Do I have to report interest if the account earned less than $10?

Yes. The bank may not send a 1099-INT if interest is very small, but you still owe tax on it. Report it on your return even if you don't receive a form. The IRS expects all interest income to be reported.

What if my co-owner and I disagree about who owns what percentage?

The IRS looks at who actually owns the money, not what the account title says. If you can show with bank statements or other documents that you contributed all the funds, you report all the interest. If you genuinely contributed different amounts, you can split the interest based on your actual contributions. Keep records of deposits and withdrawals to prove ownership if the IRS questions it.

Can I avoid taxes by putting money in a joint account?

No. Interest is taxable income no matter whose name is on the account. The only way to reduce the tax is to earn less interest, which means keeping less money in the account or moving it to an account that earns less (or no) interest.

Do I need to file a separate tax return for the joint account?

No. You report the interest on your regular personal tax return, the same one you use for all your other income. A joint account doesn't require its own return or its own tax filing.

What if the bank won't split the 1099-INT the way I asked?

Some banks have policies about how they report interest on joint accounts and may not honor a request to split it differently. If the bank won't cooperate, you can still file your return correctly and attach a statement explaining the discrepancy. You may need to file an amended return if the bank reports it wrong, but you can correct it on your end.