Can I buy my replacement property together with a partner or family member?

Two names on one deed is fine; two members in one new LLC is the mistake

The default classification rule does the damage before anyone reads §1031. A domestic entity with two or more members that makes no election is a partnership under Reg. §301.7701-3(b)(1)(ii), which means the thing you acquired with exchange funds is a partnership interest rather than real estate.

Tenancy in common avoids that because nothing is created. Mere co-ownership of property that is maintained, repaired and rented is not a separate entity for federal tax purposes, and Rev. Proc. 2002-22 §6.01 asks only that every owner appear on the deed in that character under state law, with a disregarded entity permitted to stand in for its owner.

That last clause is useful in practice. You can still put your slice inside a single-member LLC for liability reasons, and the deed will then show your LLC and your co-investor as tenants in common.

Worked example: a 60% slice of a $1,500,000 building balances a $900,000 sale

Set the numbers out before you sign, because the percentage on the deed is what has to match your sale. Take a hypothetical purchase at $1,500,000 with a $600,000 blanket loan, leaving $900,000 of equity to fund at the closing.

You take 60%: $900,000 of price, $360,000 of debt and $540,000 of cash from the intermediary. Your relinquished property sold for $900,000, its loan of $360,000 was paid off at that closing, and $540,000 came across, so every line matches and no boot appears.

Your co-investor funds the other 40% from their own resources: $600,000 of price, $240,000 of debt and $360,000 of cash. Nothing in that column touches your exchange account, and the wider arithmetic behind these lines sits in balancing value, equity and debt.

• Purchase price $1,500,000, blanket loan $600,000, cash to close $900,000.
• Your 60%: price $900,000, debt $360,000, exchange cash $540,000.
• Their 40%: price $600,000, debt $240,000, their own cash $360,000.
• Round hypothetical figures; closing costs and prorations will move the real numbers.

The co-investor's money must never run through your exchange account

Keep two funding sources visibly separate on the settlement statement. Your intermediary wires against your percentage only, and the co-investor wires their own funds directly to the closing agent.

The same separation applies to borrowing. Where a single lien covers the whole parcel, §6.09 requires each owner's exposure to track their percentage exactly, and §6.14 rules out a lender who is related to an owner, to the sponsor or to the manager.

If instead your co-investor borrows against their own interest alone, that loan sits outside the proportionate-sharing condition and outside your exchange arithmetic entirely. Expect most institutional lenders to prefer one loan and every owner's signature.

What the co-ownership agreement can say without turning you into partners

A written agreement is not a risk; a partnership-flavoured one is. Section 6.03 of the revenue procedure is the line that matters: the co-owners may not file a partnership return, conduct business under a common name, sign anything identifying them as partners or members, or otherwise hold themselves out as a business entity.

Inside that line there is room. Section 6.04 lets the agreement run with the land and require an interest to be offered to the other co-owners at fair market value before partition, §6.05 requires unanimity for a sale, a lease, a manager hire or a blanket-lien change while allowing majority rule elsewhere, and §6.06 preserves each owner's right to transfer, partition and encumber.

Management is where amateur drafting fails. Section 6.12 requires management and brokerage agreements to be renewable at least annually, requires the manager to disburse each owner's share of net revenue within three months of receipt, and forbids fees that depend on the income or profits from the property.

Rolling the co-ownership into an LLC later is a swap-and-drop, with its own risk

Many co-investors plan to contribute their interests to an LLC once the dust settles. Section 1031 requires that the replacement be held for productive use in a trade or business or for investment, and a contribution weeks after closing invites the argument that it was acquired to be contributed instead.

There is no statutory number of months, which is precisely why the question is fact-driven; the practical framing is in how long must I hold the replacement and drop-and-swap and swap-and-drop strategies.

The reverse order carries a marker too. Under §6.03 the Service will usually decline to rule when the fractional owners came out of an entity shortly beforehand, which is why dividing an existing LLC at the last minute draws attention.

If the partner exists only to close a funding gap, there is a quieter option

A co-investor brought in for the last few hundred thousand dollars buys you a purchase and a relationship with unanimous-consent votes attached for as long as you both own the building. That trade is worth making deliberately rather than by deadline pressure.

The alternative is to buy what you can carry alone and place the remainder in a professionally managed trust interest, which is how a split purchase usually gets done; see splitting an exchange between a DST and a direct purchase and traditional DST. Take either route to your own CPA or attorney while you still have identification choices.

Breakwater Exchange is a 1031 exchange broker with more than twenty years of experience and over a billion dollars in DST transactions, licensed in all 50 states inside a regulated broker-dealer framework. Send us the purchase price and what your sale will net, and we will show you what the gap actually costs either way.

• Agree the percentages in the purchase contract, not at the settlement table.
• Get the lender's consent to two borrowers on one lien in writing before day 45.
• Have counsel draft the co-ownership agreement against the §6 conditions, including the fee and voting terms.
• Decide in advance how a future sale, refinance or exit will be triggered, since §6.05 gives each owner a veto.