The tax implications of tenants in common versus joint tenants look identical while you own the property — each owner reports their share of income, expenses, and eventual sale gain — but they split apart dramatically when an owner dies. A tenancy in common gives a stepped-up basis only on the deceased owner’s fractional share. A joint tenancy between non-spouses can produce a step-up on anywhere from zero to 100 percent of the property, depending on who paid for it and what records survive. Married joint tenants get a flat 50 percent step-up, and married couples in community property states can get a full step-up on the entire property. The structure you pick at closing can cost or save heirs tens of thousands of dollars in capital gains tax decades later.
What Each Structure Actually Is
Tenancy in common lets two or more people own defined shares that don’t have to be equal. One owner might hold 70 percent and another 30. Each owner can sell, mortgage, or will away their share independently, and when an owner dies, the share passes through their estate rather than to the other owners.1Legal Information Institute. Tenancy in Common
Joint tenancy requires 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 passes automatically to the surviving joint tenants and skips probate.2Legal Information Institute. Joint Tenancy Deed your share to someone else and you break the equal-interest requirement, converting the whole thing into a tenancy in common.
Basis at Purchase
Your initial basis is the number you’ll use to calculate gain when you sell. For tenants in common, each owner’s basis tracks their actual ownership percentage. Own 60 percent of a $400,000 purchase, and your basis is $240,000.
Joint tenants always split basis equally, because the law requires equal shares. Two joint tenants each get half, three each get a third, regardless of who wrote which check at closing. That rule creates a quiet problem when contributions aren’t equal. 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. The mismatch matters later for both capital gains and gift tax.
Reporting Rental Income While You Own
If the property produces rental income, each owner reports a proportionate share on Schedule E of their own return.3Internal Revenue Service. About Schedule E (Form 1040) The IRS instructions are explicit: “If you own a part interest in a rental real estate property, report only your part of the income and expenses on Schedule E.”4Internal Revenue Service. 2025 Instructions for Schedule E (Form 1040) Mortgage interest, depreciation, and property tax deductions split the same way.
Married co-owners who both materially participate in a rental activity can elect qualified joint venture status, letting each spouse file on Schedule E instead of preparing a partnership return on Form 1065.4Internal Revenue Service. 2025 Instructions for Schedule E (Form 1040) The election is only available to spouses, and only when they operate the activity directly rather than through an LLC or similar entity.
Capital Gains at Sale
When the property sells, each owner calculates their own gain: their share of net proceeds minus their individual adjusted basis. Two tenants in common with different ownership percentages and different purchase prices can walk away with very different tax bills from the same closing.
Primary Residence Exclusion
If the property is your main home, you may exclude up to $250,000 of gain, or up to $500,000 on a joint return with your spouse.5Internal Revenue Service. Topic No. 701, Sale of Your Home You need to have owned and lived in the home for at least two of the five years before the sale.
Each unmarried co-owner who independently meets both tests qualifies for a separate $250,000 exclusion. Two unmarried joint tenants who both live in the property can collectively exclude up to $500,000, each claiming their share on their own return. A co-owner who doesn’t live there — a parent who co-signed to help a child buy, for instance — gets no exclusion on their share.
The Stepped-Up Basis at Death
This is where the two structures part ways. When someone dies owning property, the basis of what’s included in their estate generally resets to fair market value as of the date of death.6Office of the Law Revision Counsel. 26 US Code 1014 – Basis of Property Acquired From a Decedent That reset can erase decades of appreciation. How much of the property gets it depends entirely on the ownership structure.
Tenants in Common
Only the decedent’s fractional share is included in the estate and steps up. The surviving owner’s share keeps its original basis.
Take two people who buy a property as 50/50 tenants in common for $200,000, giving each a $100,000 basis. One dies when the property is worth $500,000. The deceased owner’s half gets a new basis of $250,000. The surviving owner still carries their original $100,000. Sell immediately for $500,000, and the estate’s half shows zero gain while the survivor owes tax on $150,000. Combined basis going forward: $350,000.
The appeal of TIC here is predictability. What’s included in the estate matches what’s on the deed, and there’s no argument about who contributed what.
Non-Spousal Joint Tenants
This is where families and business partners most often get hurt. Under federal law, the full value of jointly held property is included in the deceased joint tenant’s estate unless the survivor can prove they contributed their own money toward the purchase.7Office of the Law Revision Counsel. 26 US Code 2040 – Joint Interests The burden sits on the survivor.
Three outcomes are possible:
- If the survivor can’t document any contribution, 100 percent of the property’s value is included in the decedent’s estate and 100 percent of the property steps up. Best possible outcome for capital gains, worst for the size of the taxable estate.
- If the survivor can prove a specific contribution, only the decedent’s proportionate share is included and steps up. Prove you paid 40 percent, and 60 percent goes into the estate.
- If the survivor proves equal contribution, half goes in and half steps up, matching what a 50/50 tenancy in common would have produced.
Purchase documentation matters enormously. If you paid half from your own funds but can’t produce bank records, canceled checks, or wire confirmations years or decades after the fact, the IRS can include the entire value in the decedent’s estate. Full inclusion is the statutory default, not a 50/50 split.7Office of the Law Revision Counsel. 26 US Code 2040 – Joint Interests If you hold property as joint tenants with anyone other than a spouse, keep closing documents and proof of funds permanently.
Married Joint Tenants
Congress wrote a simpler rule 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 regardless of who paid.7Office of the Law Revision Counsel. 26 US Code 2040 – Joint Interests That half steps up; the surviving spouse’s half keeps its original basis. No contribution records required, and the unlimited marital deduction means the included half usually owes no estate tax.8Office of the Law Revision Counsel. 26 USC 2523 – Gift to Spouse
Same $200,000 purchase, same $500,000 value at death: the deceased spouse’s half gets a new $250,000 basis, the surviving spouse keeps the original $100,000, combined basis $350,000.
Community Property: The Double Step-Up
Married couples in the nine community property states — Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin — can do significantly better than either joint tenancy or TIC. When one spouse dies, the entire property steps up, not just the decedent’s half.6Office of the Law Revision Counsel. 26 US Code 1014 – Basis of Property Acquired From a Decedent
Federal tax law treats the surviving spouse’s half of community property as if it were also acquired from the decedent, giving both halves a new basis equal to fair market value at death. Apply that to the running example: a $200,000 purchase worth $500,000 at death takes a full $500,000 basis. Sell immediately and the gain is zero.
This only applies to property that qualifies as community property under state law. Living in a community property state doesn’t automatically make all your property community property; how you hold title and whether you commingle funds both matter. Alaska, South Dakota, and Tennessee, among others, allow couples to opt in to community property treatment for specific assets. If you own appreciated real estate in a community property state and hold it as joint tenants, converting to community property before death can save the survivor a large tax bill.
One boundary worth naming: these capital gains rules sit under a federal estate tax exemption of $15,000,000 per individual in 2026, or roughly $30,000,000 for a married couple.9Internal Revenue Service. Whats New – Estate and Gift Tax Most estates don’t reach that threshold, so maximizing the step-up carries no estate tax cost. For estates large enough to approach the exemption, the choice between full and partial inclusion becomes a planning question in its own right.
Gift Tax Traps When Buying or Converting
Changing from joint tenancy to tenancy in common, or the reverse, requires a new deed. The conversion itself isn’t a sale, so no capital gain is triggered as long as no money changes hands. The real risk is an unintended taxable gift.
If two non-spousal joint tenants each holding 50 percent convert to a TIC where one now holds 75 percent, the other has given away a 25 percent interest. That’s a taxable gift. Any gift above the annual exclusion — $19,000 per recipient in 2026 — requires filing Form 709, even if no tax is actually due.10Internal Revenue Service. Gifts and Inheritances Form 709 tracks use of your $15,000,000 lifetime exemption.9Internal Revenue Service. Whats New – Estate and Gift Tax A professional appraisal substantiates the fair market value of the transferred interest. Transfers between spouses generally avoid the issue because of the unlimited marital deduction for gifts.8Office of the Law Revision Counsel. 26 USC 2523 – Gift to Spouse
The same issue can arise at the front end. If two people buy a home as joint tenants but one pays the full purchase price, the contributor has arguably made a gift of half the property’s value. Between spouses, the marital deduction cancels the tax consequence. Between siblings, friends, or business partners, it can require careful planning and a Form 709.
Recording a new deed can also trigger state or local transfer taxes. Rates, exemptions, and treatment of transfers between co-owners or family members vary widely. Check with your county recorder before filing.
Partnership Recharacterization: A Risk Specific to TIC Owners
Tenants in common who co-own rental or investment property face a tax risk joint tenants generally don’t: the IRS may recharacterize the arrangement as a partnership. If that happens, each owner’s stake is treated as a partnership interest rather than a direct interest in real estate, which changes income reporting and disqualifies the interest from a Section 1031 like-kind exchange.11Office of the Law Revision Counsel. 26 USC 1031 – Exchange of Real Property Held for Productive Use or Investment
Revenue Procedure 2002-22 lays out safe harbor conditions for TIC arrangements seeking to avoid partnership treatment.12Internal Revenue Service. Revenue Procedure 2002-22 The main requirements:
- No more than 35 co-owners, with a married couple counted as one.
- No partnership-like behavior — no partnership return, no common business name, no holding out as a business entity.
- Revenue and costs shared in exact proportion to ownership. No preferred returns or disproportionate allocations.
- Each co-owner keeps the right to sell, transfer, or encumber their interest without needing the others’ approval.
- Major decisions — sale of the whole property, new leases, hiring a property manager — require unanimous co-owner approval.
Falling outside the safe harbor doesn’t automatically trigger reclassification, but it removes the protection. Structured TIC deals with tiered returns or sponsor-driven management are the most common trouble spot. If you’re using a TIC for 1031 exchange purposes, verify the structure genuinely complies.
Which Structure Fits Which Situation
Tenancy in common fits owners who contribute unequally, want to leave their share to someone other than the co-owner, or want predictable estate inclusion matching the deed. Joint tenancy fits people who want automatic survivorship and probate avoidance, though the contribution-tracking burden for non-spouses is real and frequently underestimated.
Married couples in community property states should seriously consider holding appreciated property as community property rather than joint tenancy; the double step-up is one of the most valuable benefits in the tax code and comes simply from choosing the right form of title. In common-law states, married joint tenants get a 50 percent step-up that still beats most non-spousal outcomes. Whichever structure you pick, document every owner’s financial contribution at closing and keep the records indefinitely. Years from now, those records are what decides how much of the property steps up.