Opening a joint investment account with your spouse is usually a sound move for couples who manage money together, but the ownership type you select at account opening quietly decides how your investments are taxed when one of you dies, whether a creditor of one spouse can reach the balance, and how smoothly the survivor gets access. Brokerages present the titling choice as a dropdown. It deserves more thought than that.
A joint brokerage account is a taxable investment account titled in both names. Either spouse can buy, sell, deposit, or withdraw without the other’s sign-off. That shared authority is the appeal, and it is also the risk if trust ever frays.
Pick the Ownership Structure Before You Fund the Account
Four titling options exist, and they are not interchangeable. The right one depends on your state, your estate plan, and how worried you are about creditors.
Joint Tenancy With Right of Survivorship
JTWROS is the default most brokerages suggest. Both spouses own an equal, undivided interest in the whole account, no matter who deposited the money. When one spouse dies, the survivor automatically becomes sole owner by producing a certified death certificate. No probate, no executor, no waiting. For couples whose main goal is a clean handoff, JTWROS is the simplest answer.
Tenancy in Common
Tenancy in Common lets each spouse own a defined percentage, and those percentages do not have to be equal. One spouse could hold 70% and the other 30%. There is no automatic survivorship: a deceased spouse’s share becomes part of their estate and passes under their will or state intestacy rules, which usually means probate. Couples who want their share to go somewhere other than the surviving spouse, such as children from a prior marriage, sometimes pick TIC for that control. Holding the TIC interest inside a revocable living trust is a common way to skip probate while keeping the uneven split.
Tenancy by the Entirety
Tenancy by the Entirety is available only to married couples and only in states that recognize it for personal property. Roughly 18 states and the District of Columbia allow TBE for brokerage accounts; others limit it to real estate or do not recognize it at all. It works like JTWROS at death, but it adds something JTWROS does not have: strong creditor protection. The law treats the couple as a single owner, so a creditor with a judgment against only one spouse generally cannot touch the account. If TBE is available where you live and asset protection matters to you, ask the brokerage whether they support it.
Community Property
Nine states follow community property rules: Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin.1Internal Revenue Service. Publication 555 (12/2024), Community Property In these states, most assets acquired during the marriage are considered equally owned by both spouses regardless of how the account is titled or who funded it. Community property status overrides titling for tax and property-division purposes, and it produces a very large advantage at death covered below.
How the Account Is Taxed While You Are Both Alive
A joint brokerage account is fully taxable. Dividends, interest, and realized capital gains generate a tax bill in the year they occur. The brokerage issues a consolidated Form 1099 tied to the primary account holder’s Social Security number, but that SSN does not decide who owes the tax.
Reporting Depends on How You File
On a joint return, the account’s income simply lands on your shared Form 1040 and you pay tax on the total. Filing separately is more involved: the spouse whose SSN is on the 1099 reports the full amount on Schedule B and then subtracts the other spouse’s share as a Nominee Distribution. The other spouse reports their share on their own return. Unlike nominee arrangements with non-spouses, you do not have to issue a separate 1099 to your spouse.2Internal Revenue Service. Publication 550 (2025), Investment Income and Expenses JTWROS splits 50/50 by default; TIC follows the ownership percentages.
Cost Basis and Capital Gains
When you sell, the taxable gain or loss is the difference between what you received and your adjusted basis, generally what you originally paid.3Internal Revenue Service. Publication 551 (12/2025), Basis of Assets Gains and losses go on Form 8949 and flow to Schedule D.2Internal Revenue Service. Publication 550 (2025), Investment Income and Expenses Assets held more than a year qualify for long-term capital gains rates; a year or less is ordinary income. Joint ownership changes none of that.
The Wash Sale Trap Across Spousal Accounts
Here is a rule that quietly catches couples. The wash sale rule applies across spouses. If you sell a stock at a loss in the joint account and your spouse buys the same stock within 30 days in their IRA or a personal brokerage account, the IRS disallows the loss. It also works in reverse. Brokerages will not track this across firms or across your separate accounts. You have to watch it yourselves.
Net Investment Income Tax
Higher-earning couples should plan for the 3.8% net investment income tax, which applies to investment income once modified adjusted gross income exceeds $250,000 for married couples filing jointly.4Internal Revenue Service. Topic No. 559, Net Investment Income Tax That threshold is set by statute and does not adjust for inflation, so a single large realized gain from the joint account can push you over the line even in a year your other income would not.
Non-Citizen Spouse Gift Limit
When one spouse funds the joint account alone, it technically creates a gift to the other. For most couples this is a non-event: the unlimited marital deduction lets U.S. citizen spouses transfer any amount to each other free of gift tax. The exception matters: the unlimited deduction does not apply if the receiving spouse is not a U.S. citizen.5Office of the Law Revision Counsel. 26 USC 2523 – Gift to Spouse A separate annual exclusion of $194,000 for 2026 applies instead, and transfers above that require Form 709 and start consuming the donor’s lifetime exemption.6Internal Revenue Service. Instructions for Form 709 (2025) If one of you is not a U.S. citizen and the funding spouse plans a large lump-sum deposit, map this out before you move the money.
What Happens When One Spouse Dies
The titling choice does two separate things at death: it decides whether you need probate, and it decides how much of the account’s embedded gain the IRS forgives.
Probate
JTWROS skips probate entirely. The survivor sends a certified death certificate to the brokerage, the firm retitles the account into their name alone, and access continues within days. TIC does not. The deceased spouse’s share becomes part of the probate estate, and distribution follows the will or intestacy law, with the delay and legal fees that implies.
The Stepped-Up Basis Difference
Inherited property generally receives a stepped-up basis equal to fair market value on the date of death. A higher basis means a smaller taxable gain whenever the survivor sells. The catch is how much of the account gets that reset.
In common law states, a JTWROS account receives only a half step-up. The deceased spouse’s 50% is marked to current value; the survivor’s 50% keeps its original purchase-price basis. In community property states, both halves step up: the survivor’s share is treated as acquired from the decedent, so 100% of the basis resets.7Office of the Law Revision Counsel. 26 U.S. Code 1014 – Basis of Property Acquired From a Decedent
The dollars are not small. On a $200,000 portfolio that grew to $1,000,000, a half step-up in a common law state leaves roughly $400,000 of embedded gains in the survivor’s share. A full step-up in a community property state eliminates all $800,000. The tax savings on a portfolio that size can easily top $100,000.
Planning for the Second Death
JTWROS handles the first death. It does not handle the second. A Transfer on Death registration lets you name primary and contingent beneficiaries who inherit after the surviving spouse dies, bypassing probate again. Most major brokerages support TOD on joint accounts. Without it, the account becomes part of the surviving spouse’s estate and runs through probate before reaching the next generation.
Creditor Exposure Is Real
Joint investment accounts are not shielded from creditors by default, and this is where many couples miscalculate.
In a common law state with a standard JTWROS account, a creditor holding a judgment against only one spouse can often reach the debtor-spouse’s interest. Some states let the creditor take up to half the balance; others limit garnishment to debts that benefited both spouses or the family.
Community property states expose the account more broadly. Because spouses typically share liability for debts incurred during the marriage, a judgment creditor of one spouse can usually garnish the joint account regardless of who incurred the debt. In some community property states, the creditor can even reach a spouse’s separate account for the other spouse’s obligation.
Tenancy by the Entirety offers the strongest protection. Because neither spouse owns a separable share, a creditor with a judgment against only one spouse generally cannot touch the account at all. Only a judgment against both spouses jointly reaches TBE assets. If creditor protection is a real concern and your state recognizes TBE for brokerage accounts, that is the titling to ask for.
Funds in any account that are traceable to Social Security, disability, or veterans’ benefits may be exempt from garnishment under federal law regardless of ownership type.
If the Marriage Ends
Joint investment accounts are marital property subject to division in a divorce. Equitable division, which most states follow, does not necessarily mean 50/50. Courts weigh contributions, length of the marriage, earning capacity, and other state-specific factors. Community property states usually start from equal division but can deviate.
In practice, the account is either liquidated and the cash split, or the brokerage divides it into two individual accounts. Watch which lots go to which spouse. Tax basis travels with the shares, so a spouse who receives low-basis stock inherits a larger future tax bill than the spouse who gets high-basis stock or cash, even when the current market values are identical.
Opening and Funding the Account
The brokerage will ask for government-issued ID and a Social Security number from both spouses. During the application, you choose the ownership structure. This is the moment for the conversation about JTWROS, TIC, or TBE. Changing titling later is possible but can carry its own tax and legal complications, so getting it right at the start is worth the extra time.
Most couples fund the account with an ACH transfer from a linked bank account. ACH is usually free but comes with daily limits often in the $25,000 to $100,000 range. A wire gives same-day availability for larger deposits but typically carries a bank fee. If you are consolidating existing investments from another brokerage, an ACATS transfer moves the securities themselves without selling them, preserving each position’s cost basis and holding period.8DTCC. Automated Customer Account Transfer Service (ACATS) Most ACATS transfers complete within about a week.9FINRA. Customer Account Transfers
SIPC Coverage
If the brokerage fails, SIPC protects customer assets up to $500,000 per account capacity, including a $250,000 limit for cash. A joint account is a separate capacity from either spouse’s individual accounts at the same firm.10SIPC. Investors with Multiple Accounts A couple can therefore have $500,000 of protection on the joint account and another $500,000 on each spouse’s individual account at the same brokerage. SIPC covers broker insolvency, not market losses.
Trading Authority, and What a Joint Account Is Not
Both spouses receive full, independent authority on the joint account. Either can trade, deposit, or withdraw without the other’s approval. The upside is speed. The downside is that there is no built-in safeguard if trust breaks down or one spouse trades recklessly. Setting transaction alerts so both of you get notified is a simple check.
One boundary worth stating. Joint access helps if one spouse is temporarily unreachable, but it is not a substitute for a durable power of attorney. A POA creates a legal fiduciary duty for the named agent. A joint account holder has none. For assets outside the joint structure, and for incapacity planning generally, a POA is the right tool.