How to Transfer Stock From an Individual to a Joint Account

To transfer stock from an individual brokerage account to a joint account, decide on the joint ownership structure first, then have the brokerage retitle the shares “in kind” so nothing is sold in the process. If both accounts sit at the same firm, one application and a transfer authorization form usually finish the job. If they’re at different firms, the receiving brokerage pulls the shares over through the Automated Customer Account Transfer Service. The paperwork is the easy part. The consequences of adding a co-owner — gift tax, cost basis, creditor exposure, and control — are what deserve your attention before you sign anything.

Pick the Joint Ownership Structure Before Anything Else

How the joint account is titled determines who controls the assets, what happens at death, and how much of the stock a creditor can reach. Four structures cover almost every case.

Joint Tenants With Right of Survivorship

JTWROS is the default at most brokerages. Both owners hold an equal, undivided interest in every share. When one owner dies, the survivor automatically absorbs the account without probate. That automatic transfer is the main appeal, but it also means the deceased owner’s will has no say over these assets. If you want the stock to go to someone other than your co-owner at death, JTWROS is the wrong structure.

Tenants in Common

Tenants in common lets each owner hold a different percentage — 70/30, 60/40, whatever you agree on. When one owner dies, that share doesn’t pass to the surviving co-owner. It flows through the decedent’s estate under their will or state intestacy rules. Each owner keeps more control over where their share ends up, but the survivor may find themselves sharing the account with an heir they didn’t choose.

Community Property

Community property is available only to married couples in the nine states that recognize it. Assets acquired during the marriage are treated as equally owned. The tax payoff comes at death: the surviving spouse can receive a full step-up in cost basis on the entire asset, not just the deceased spouse’s half. On highly appreciated stock, that difference can save tens of thousands in capital gains taxes.

Tenancy by the Entirety

Tenancy by the entirety is a married-couples-only structure recognized in roughly half the states. It works like JTWROS with one critical difference: neither spouse can sell, transfer, or encumber the property without the other’s consent. The practical benefit is creditor protection. If only one spouse owes a debt, creditors generally can’t reach assets held this way. The protection ends at divorce or death. Not every brokerage offers this titling for investment accounts, so ask specifically.

Adding a Co-Owner Is a Gift for Tax Purposes

The IRS treats putting someone else’s name on your brokerage account as a gift to that person. In a standard JTWROS arrangement, the gift equals half the fair market value of the stock on the date of the transfer, even though no money changed hands and no shares were sold.

Annual Exclusion and Lifetime Exemption

For 2026, you can give up to $19,000 to any individual without triggering a gift tax filing requirement.¹ So if the total stock going into a JTWROS account is worth $38,000 or less, the gifted half falls inside the annual exclusion and you don’t have to do anything further.

When the gifted portion exceeds $19,000, the excess starts eating into your lifetime unified gift and estate tax exemption, which is $15,000,000 per individual for 2026.¹ Most people won’t exhaust it, but every dollar used now reduces what’s available to shelter your estate later.

Form 709

Any gift above the $19,000 annual exclusion requires you to file IRS Form 709, even if the lifetime exemption absorbs the excess and you owe no actual tax.² The form is how the IRS tracks your use of the lifetime credit. Skipping it when it’s required can lead to penalties and interest later.

Form 709 is due by April 15 of the year after the transfer.² Move $80,000 in stock into a JTWROS account in 2026, and the gifted half is $40,000. You’d file Form 709 by April 15, 2027, reporting the $21,000 excess over the annual exclusion. That $21,000 reduces your remaining lifetime exemption from $15,000,000 to $14,979,000.

If Your Co-Owner Is Your Spouse

Transfers between spouses who are both U.S. citizens are shielded by the unlimited marital deduction. No gift tax applies and no Form 709 is required, regardless of amount.

The rules change sharply if your spouse is not a U.S. citizen. The annual exclusion for gifts to a non-citizen spouse is $194,000 for 2026, not $19,000.³ Gifts above that threshold require a Form 709 filing and use up lifetime exemption. This detail routinely trips up couples who assume the marital deduction applies automatically.

How the Transfer Actually Works

The goal is an in-kind transfer: the actual shares move to the new joint account without being sold. Selling first would trigger capital gains taxes for no reason.

Same Brokerage

If you’re opening the joint account at the same firm that holds your individual account, the brokerage handles everything with its own internal paperwork. You’ll typically complete a joint account application and a transfer authorization form. The firm retitles the shares under the new ownership structure, often within a few business days.

Different Brokerages

Moving shares between firms uses the Automated Customer Account Transfer Service (ACATS), an electronic system operated by the National Securities Clearing Corporation.⁴ Submit a Transfer Initiation Form to the receiving firm, and it initiates the request electronically. An ACATS transfer without complications should complete within six business days.⁵ Manual transfers, used when one institution doesn’t participate in ACATS, have no set timeline and can take considerably longer.

Medallion Signature Guarantee

If your transfer involves physical stock certificates, you’ll need a Medallion Signature Guarantee, a specialized authentication stamp from a participating financial institution that protects against forged transfer requests.⁶ Some firms also require one for high-value electronic transfers. Not every bank branch offers Medallion guarantees, so call ahead.

Check Cost Basis After Settlement

The receiving brokerage has to record the original cost basis of every transferred share. Firms use the DTCC’s Cost Basis Reporting Service to pass this information between institutions.⁷ Errors still happen. Once the transfer settles, compare the cost basis on your new account statement to your own records. A wrong number can lead to overpaying or underpaying taxes when you eventually sell.

What the Transfer Does to Cost Basis

This is where many people lose money without realizing it. Gifting stock during your lifetime and passing it at death produce completely different tax outcomes.

Carryover Basis on Gifted Shares

When you transfer stock into a joint account, the new co-owner takes a carryover basis on their half. They inherit your original purchase price, not the current market value.⁸

Say you bought 200 shares at $20 each — total basis $4,000. After transferring the stock into a JTWROS account, you and your co-owner each effectively own half. Your basis for your 100 shares is $2,000, and the co-owner’s basis for their 100 shares is also $2,000, no matter what the shares are worth today. When your co-owner sells, they owe capital gains on the difference between $2,000 and the sale price of their half.

Underwater Stock Loses Its Loss

Transferring stock that has dropped below what you paid creates a quirk. If your original basis is higher than the fair market value on the date of the gift, the recipient uses two different numbers. For calculating a gain, they use your original (higher) basis. For calculating a loss, they use the lower fair market value on the date of the gift.⁸ Sell between those two numbers, and there’s no gain or loss at all. The practical result: transferring underwater stock into a joint account can permanently destroy a tax loss you could have taken yourself by selling first.

Compare This to Inherited Stock

Property acquired from a decedent receives a step-up in basis to fair market value at the date of death.⁹ All unrealized gains built up during the decedent’s lifetime are wiped out. The contrast with a lifetime gift is stark, and worth thinking about before you move stock now that a family member could instead inherit later.

For JTWROS accounts, only the portion included in the deceased owner’s gross estate steps up. Between spouses, that’s typically half. The surviving spouse’s half keeps its original carryover basis, leaving a blended cost basis on the combined holding. Community property avoids this: the surviving spouse’s half also qualifies for the step-up, so the entire asset resets to fair market value at the first spouse’s death.⁹

Risks to Weigh Before You Sign

Adding someone to your brokerage account gives them real ownership rights. You can’t easily take those rights back.

Your Co-Owner Can Empty the Account

In most joint accounts, either owner can sell securities and withdraw the entire balance without the other’s permission.¹⁰ You may have legal recourse afterward, but the brokerage itself generally won’t stop a co-owner from acting alone. This is the single biggest practical risk of a JTWROS account, especially with a non-spouse co-owner. Tenancy by the entirety, where available, sidesteps this by requiring both spouses to act together.

Your Co-Owner’s Creditors

Once your co-owner has a legal interest in the account, their personal creditors may be able to reach it. A lawsuit, bankruptcy, or judgment against them can put their share — and in some states more than their share — at risk. This exposure exists even though you funded the whole account. Tenancy by the entirety shields against the individual debts of one spouse, but only for married couples in states that recognize it, and only until divorce.

Treat the Transfer as Permanent

Moving the stock back out later is a second transfer with its own tax consequences. Your co-owner would be making a gift back to you, potentially triggering their own Form 709 obligation. If the relationship deteriorates through divorce, family conflict, or a business dispute, unwinding the joint account gets messy and expensive. Assume the paperwork you sign is one-way.

A Warning If Medicaid Might Be in the Picture

If you or the person you’re adding might apply for Medicaid long-term care benefits within five years, the transfer can create serious eligibility problems. Medicaid uses a 60-month look-back period on nursing home applications, reviewing every asset transfer during that window for anything given away below fair market value.¹¹ A transfer that runs afoul of the look-back triggers a penalty period during which Medicaid won’t pay for long-term care.

How the joint account is set up matters. Adding a co-owner with an “and” designation, where both people must sign off on transactions, is generally treated as giving away resources and violates the look-back rules. An “or” designation, where either person can act independently, typically does not trigger a penalty. For married couples, Medicaid counts jointly owned assets regardless of titling, though the non-applicant spouse can keep a limited amount while the applicant spouse’s countable assets must fall below a much lower threshold. If Medicaid may be in your future within five years, talk to an elder law attorney before making the transfer.

1
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
2
Internal Revenue Service. Instructions for Form 709 (2025)
3
Internal Revenue Service. Frequently Asked Questions on Gift Taxes for Nonresidents Not Citizens of the United States
4
FINRA. Customer Account Transfers
5
U.S. Securities and Exchange Commission. Transferring Your Brokerage Account: Tips on Avoiding Delays
6
U.S. Securities and Exchange Commission. Medallion Signature Guarantees: Preventing the Unauthorized Transfer of Securities
7
DTCC. Cost Basis Reporting Service (CBRS)
8
Office of the Law Revision Counsel. 26 U.S. Code 1015 – Basis of Property Acquired by Gifts and Transfers in Trust
9
Office of the Law Revision Counsel. 26 U.S. Code 1014 – Basis of Property Acquired From a Decedent
10
Consumer Financial Protection Bureau. A Joint Checking Account Owner Took All the Money Out and Then Closed the Account Without My Agreement. Can They Do That?
11
CMS. Transfer of Assets in the Medicaid Program – Important Facts for State Policymakers