A Form 1099 for a joint account lists only one owner’s Social Security number, but the IRS expects each owner to pay tax on their own share of the income. The person named on the form reports the full amount on their return, then subtracts the co-owner’s portion as a “nominee distribution” and issues that co-owner a matching 1099. Married couples filing jointly skip the whole process because their income lands on one return anyway.
Why Only One Name Appears on the 1099
Banks and brokerages can put only one Social Security number on an information return. Whoever opened the account or is listed first usually gets it. The 1099-INT reports interest of $10 or more from savings, CDs, and similar deposits.1Internal Revenue Service. About Form 1099-INT, Interest Income The 1099-DIV reports dividends and distributions from stocks and mutual funds.2Internal Revenue Service. About Form 1099-DIV, Dividends and Distributions The 1099-B reports proceeds from sales of securities.3Internal Revenue Service. About Form 1099-B Whichever form the account generates, it arrives showing the full year’s income under one person’s number.
From the IRS’s perspective, that person earned all of it until the return says otherwise. That is the problem nominee reporting solves.
Spouses filing jointly are the exception. Because both incomes go on a single return, there is no need to issue a nominee 1099 between them.4Internal Revenue Service. Instructions for Schedule B (Form 1040) – Section: Nominees Everyone else sharing an account — unmarried partners, a parent and adult child, siblings, business associates, spouses filing separately — has to go through the nominee steps.
How to Split the Income: Nominee Reporting
Say a joint savings account earned $1,000 in interest last year. The bank put your Social Security number on the 1099-INT, and your co-owner funded half the account. Here is the sequence.
Enter the entire $1,000 on Schedule B of your Form 1040, exactly as the 1099-INT shows.4Internal Revenue Service. Instructions for Schedule B (Form 1040) – Section: Nominees On a separate line of Schedule B, enter $500 and label it “Nominee Distribution.” Your taxable interest drops to $500.
Prepare a 1099-INT (or 1099-DIV, depending on the income type) showing $500 payable to the co-owner, using their name and Social Security number. That form is due to the co-owner by January 31 of the year after the income was earned. File copies with the IRS along with a transmittal Form 1096.5Internal Revenue Service. General Instructions for Certain Information Returns
The co-owner then reports their $500 on their own return. The IRS now has matching records for both of you, which is the point.
Split the Income the Way You Actually Own It
The nominee amount should reflect real ownership of the funds, not an easy 50/50 guess. If you put in 70 percent of the money in the account, you report 70 percent of the income and pass 30 percent to the co-owner. If contributions were genuinely equal, an even split is correct. For a longer-running account where contributions varied, use the ratio that best reflects how the balance was built.
Keep your workings. Bank statements, deposit records, and any written agreement between owners are what you fall back on if a return is later questioned.
What Happens If You Skip Nominee Reporting
Two things go wrong. The first is a direct penalty for the missing information return. For returns due in 2026, the IRS charges $60 per form if you file up to 30 days late, $130 per form from 31 days late through August 1, and $340 per form after August 1 or if you never file. Intentional disregard is $680 per form with no cap.6Internal Revenue Service. Information Return Penalties
The second problem is the IRS matching program. If you report only your share of the interest on your own return but never file the nominee 1099 for the co-owner’s share, the IRS sees a mismatch between what the bank reported under your Social Security number and what you put on your 1040. That mismatch triggers a CP2000 notice proposing additional tax on income you already gave to your co-owner. Untangling it after the fact takes far longer than filing the nominee form on time.
When a Child Is on the Account
Parents sometimes add a child to a savings or investment account. The nominee rules work the same way, but a second issue surfaces. A child’s unearned income above $2,700 (for 2026) is taxed at the parent’s marginal rate rather than the child’s typically lower rate. Below that threshold, part is shielded by the child’s standard deduction and part is taxed at the child’s own rate. This kiddie tax applies to children under 19 and to full-time students under 24. You can report the income on the child’s return, or elect to include it on the parent’s return using Form 8814.
Wrong or Missing Forms
If a 1099-INT or 1099-DIV shows the wrong dollar amount or a wrong Social Security number, ask the financial institution for a corrected form. The corrected version has a box checked showing it supersedes the original.
When a corrected form does not arrive before your filing deadline, report the income from your own records: bank statements, year-end summaries, deposit confirmations. Do not reach for Form 4852. It is a substitute only for Form W-2 and Form 1099-R, not for investment 1099s.7Internal Revenue Service. About Form 4852, Substitute for Form W-2, Wage and Tax Statement, or Form 1099-R Report the number your records support and keep the documentation.
If a payer refuses to issue or correct a form, you can call the IRS, which will contact the payer on your behalf. Document every call and letter.
How the Split Can Change Your Social Security Tax
Getting the nominee split right matters more once Social Security enters the picture. Interest and dividends from a joint account that belong to you flow into your adjusted gross income, and AGI is the main component of the “combined income” figure the IRS uses to decide how much of your Social Security is taxable. Combined income equals AGI, plus any tax-exempt interest such as municipal bond income, plus one-half of your Social Security benefits.8Social Security Administration. Must I Pay Taxes on Social Security Benefits
The single-filer thresholds are $25,000 and $34,000; for joint filers, $32,000 and $44,000. Below the lower number, no benefits are taxable. Between the two, up to 50 percent are taxable. Above the upper number, up to 85 percent are taxable.9Internal Revenue Service. IRS Reminds Taxpayers Their Social Security Benefits May Be Taxable These thresholds are set in statute and are not indexed for inflation.10Office of the Law Revision Counsel. 26 USC 86 – Social Security and Tier 1 Railroad Retirement Benefits
Because the thresholds sit that low, a few hundred dollars of extra interest can be enough to push combined income across a line and make thousands of dollars in benefits taxable for the first time. Reporting too much investment income (skipping the nominee subtraction when you should have taken it) inflates combined income and can raise your Social Security tax. Reporting too little and letting the IRS catch it produces back taxes on the investment income and on the additional benefits that become taxable as a result. The nominee amount is worth getting right for that reason alone.
Social Security itself is reported on Form SSA-1099, a separate document mailed each January by the Social Security Administration.11Social Security Administration. Get Your Social Security Benefit Statement (SSA-1099) Even if benefits are direct-deposited into a joint bank account, the income belongs only to the person whose Social Security number is on the SSA-1099. There is no nominee split for benefits themselves; the split question applies only to the interest, dividends, or sale proceeds the joint account generates.