The biggest tax difference between tenants in common and joint tenants shows up when an owner dies: a tenancy in common gives the heirs a stepped-up basis only on the deceased owner’s fractional share, while a joint tenancy between people who aren’t married can step up anywhere from zero to 100 percent of the property depending on who paid for it and what the survivor can prove. The two structures also differ in how you report basis at purchase, how you split rental income, and how gift tax and partnership rules can bite you. Here’s what changes with each choice, and where the choice matters most.
What Actually Distinguishes the Two
Tenancy in common lets two or more people own separate, defined shares of the same property. The shares don’t have to be equal, each owner can sell or give away their share independently, and when an owner dies, their share passes through their will.1Legal Information Institute. Tenancy in Common
Joint tenancy requires all owners to hold equal shares acquired at the same time, through the same deed. Its defining feature is the right of survivorship: when one joint tenant dies, their share automatically passes to the surviving joint tenants and bypasses probate.2Legal Information Institute. Joint Tenancy
Those structural rules drive every tax difference that follows.
Basis at Purchase
Your initial basis is what you subtract from your share of the sale price to figure your capital gain later. For tenants in common, each owner’s basis tracks their actual ownership percentage. If you own 60 percent of a $400,000 property, your basis is $240,000.
Joint tenants split basis equally, because the law requires equal shares. Two joint tenants each get half, three each get a third, regardless of who actually wrote the checks at closing. If you put up $300,000 of a $400,000 purchase and your sibling puts up $100,000, but you take title as joint tenants, your basis is still $200,000 each. That mismatch between money contributed and basis recorded creates gift tax and estate tax complications later.
Reporting Rental Income and Expenses
If the property is rented out, each owner reports their proportionate share of income and expenses on Schedule E of their individual return. The IRS instructions state it plainly: “If you own a part interest in a rental real estate property, report only your part of the income and expenses on Schedule E.”3Internal Revenue Service. 2025 Instructions for Schedule E (Form 1040) Mortgage interest, depreciation, and property taxes split the same way.
Married couples who co-own rental property and both materially participate can elect qualified joint venture status, letting each spouse report their share on Schedule E instead of filing a Form 1065 partnership return.3Internal Revenue Service. 2025 Instructions for Schedule E (Form 1040) The election is only available to spouses, and only when they operate the activity together without using a state-law entity like an LLC.
Capital Gains at Sale
When co-owners sell, each owner calculates gain separately: their share of the net proceeds minus their individual adjusted basis. Two tenants in common with different percentages and different acquisition dates can walk away from the same closing table with very different tax bills.
If the property is your main home, you may exclude up to $250,000 of gain, or $500,000 on a joint return with your spouse, provided you owned and lived in the home for at least two of the five years before the sale.4Internal Revenue Service. Topic No. 701, Sale of Your Home Each unmarried co-owner who independently meets the tests qualifies for their own $250,000 exclusion. Two unmarried joint tenants who both live in the property can collectively exclude up to $500,000, each claiming their own exclusion on their own return. A co-owner who doesn’t live in the property, such as a parent who helped a child buy it, gets no exclusion on their share.
For investment property, either structure supports a Section 1031 like-kind exchange on the individual fractional interest.5Office of the Law Revision Counsel. 26 USC 1031 – Exchange of Real Property Held for Productive Use or Investment One co-owner can exchange while the other takes cash, as long as each satisfies the 45-day identification and 180-day closing rules independently. Tenants in common face an extra hurdle here, discussed further below: the arrangement has to look like co-ownership rather than a partnership.
What Happens When an Owner Dies
This is where the choice matters most. When someone dies owning property, the tax basis of what’s included in their estate generally resets to fair market value on the date of death.6Office of the Law Revision Counsel. 26 US Code 1014 – Basis of Property Acquired From a Decedent This step-up can erase decades of unrealized appreciation. How much of the property gets the reset depends entirely on how title is held.
Tenants in Common
Only the decedent’s fractional share is included in the estate, and only that share gets stepped up. The survivor’s share keeps its original basis.
Two people buy a property as 50/50 tenants in common for $200,000, so each has a $100,000 basis. One dies when the property is worth $500,000. The deceased owner’s half gets a new $250,000 basis. The survivor still carries their original $100,000 basis. A sale for $500,000 immediately after death produces zero gain on the estate’s half and $150,000 of gain on the survivor’s half. Combined basis going forward: $350,000.
The virtue of a tenancy in common here is predictability. Estate inclusion matches the deed. No arguments about who paid for what.
Non-Spousal Joint Tenants
Joint tenancy between people who aren’t married follows a very different rule that catches families and business partners off guard constantly. Under federal law, the full value of the property is included in the deceased joint tenant’s estate unless the surviving tenant can prove they contributed their own money toward the purchase.7Office of the Law Revision Counsel. 26 US Code 2040 – Joint Interests The statute puts the burden squarely on the survivor.
Three possible outcomes:
- If the survivor can’t prove any contribution, 100 percent of the value is included in the decedent’s estate and the entire property is stepped up. Best possible result for capital gains, though it increases the taxable estate.
- If the survivor proves their exact contribution, only the decedent’s proportionate share is included and stepped up. Prove 40 percent, and 60 percent is included.
- If the survivor proves equal contribution, half is included and half is stepped up, matching a 50/50 tenancy in common.
The default when the survivor can’t produce evidence is full inclusion, not a 50/50 split. Bank records, canceled checks, and wire confirmations from years or decades earlier are what stand between an heir and a fully stepped-up basis on one side, or a taxable estate inflated by the full property value on the other. If you hold property as joint tenants with anyone other than your spouse, keep the closing documents and proof of funds permanently.
Married Joint Tenants
Congress simplified this for spouses. When a married couple holds property as joint tenants or tenants by the entirety, exactly 50 percent is included in the deceased spouse’s estate no matter who paid for it.7Office of the Law Revision Counsel. 26 US Code 2040 – Joint Interests That half is stepped up. The survivor’s half keeps its original basis. No contribution records needed, and the unlimited marital deduction usually means no estate tax on the included half.8Office of the Law Revision Counsel. 26 USC 2523 – Gift to Spouse
The Community Property Alternative
One boundary worth flagging: married couples in the nine community property states — Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin — have access to a better result than either joint tenancy or tenancy in common produces. When one spouse dies, the entire property receives a stepped-up basis, not just the decedent’s half.6Office of the Law Revision Counsel. 26 US Code 1014 – Basis of Property Acquired From a Decedent A $200,000 property worth $500,000 at death gets a full $500,000 basis. Sell immediately, and the gain is zero.
This applies only to property classified as community property under state law. Living in a community property state doesn’t automatically qualify all your holdings. If you own appreciated property in one of these states, converting joint tenancy to community property before death can save the survivor a substantial tax bill.
Gift Tax When Contributions Don’t Match Title
Taking title as joint tenants when only one person paid can itself be a taxable gift. If two people buy a home as joint tenants but one paid the whole price, the contributing owner has arguably given half the property’s value to the other owner. Between spouses, the unlimited marital deduction for gifts eliminates the tax consequence.8Office of the Law Revision Counsel. 26 USC 2523 – Gift to Spouse Between siblings, unmarried partners, or business associates, it can require filing Form 709 to report the gift and track lifetime exemption usage.9Internal Revenue Service. Gifts and Inheritances
The same issue arises when co-owners restructure. Converting a 50/50 joint tenancy into a tenancy in common where one owner now holds 75 percent means a 25 percent gift to the other direction of the transfer. A professional appraisal supports the reported value on Form 709.
Partnership Recharacterization Risk for TIC Owners
Tenants in common who co-own rental or investment property face a risk that joint tenants generally don’t: the IRS may recharacterize the arrangement as a partnership. If that happens, each owner’s interest becomes a partnership interest rather than a direct interest in real estate, and it no longer qualifies for a Section 1031 exchange.
Revenue Procedure 2002-22 sets out safe harbor conditions that co-owners can follow to stay on the co-ownership side of the line.10Internal Revenue Service. Revenue Procedure 2002-22 The safe harbor caps the arrangement at 35 co-owners, requires proportional sharing of revenue and costs, prohibits partnership-like behavior such as filing a partnership return or operating under a common business name, requires unanimous approval for major decisions like a sale of the whole property or hiring a manager, and preserves each owner’s right to sell or encumber their own interest without approval from the others. Structured TIC investment deals with preferred returns or tiered waterfalls are the common failure mode. If you’re entering a TIC deal for 1031 purposes, the structure needs to genuinely comply.
Choosing Between the Two
Tenancy in common fits owners who contribute unequally, want to leave their share to someone other than the co-owner, or want the estate-inclusion percentage to match the deed with no arguments about contribution proof. Joint tenancy fits people who want automatic survivorship and probate avoidance, and it works cleanly for spouses. For non-spouses, the contribution-tracking burden is real and routinely underestimated.
Married couples in community property states should think hard about holding appreciated property as community property rather than joint tenancy. The double step-up at death is one of the most valuable benefits in the code, and it comes simply from choosing the right form of title. In common-law states, spousal joint tenancy still delivers a clean 50 percent step-up without documentation battles. Whatever structure you land on, record every owner’s financial contribution at the time of purchase and keep those records indefinitely — that paper trail is what determines the tax outcome years or decades later.