Can I 1031 into a property I will partly live in?

The unit you occupy is personal-use property, so only the rental share replaces what you sold

The like-kind rules apply only when both properties are held for investment or business use. Publication 544 states that both the real property you give up and the real property you receive must be held that way, and lists your home among the property that does not qualify.

A building with your own unit in it is therefore treated in two parts, the same way Reg. section 1.121-1(e) splits a property used partly as a home. Rev. Proc. 2005-14 handles an exchange that delivers both a residence and business property by treating the residence separately and giving it a basis equal to its fair market value.

In that IRS example, the residence received was paired with home-sale gain that was excluded. When everything you sold was investment property, nothing excludes the residential share, and section 1031(b) taxes other property received up to your gain.

The rental units have to clear the value, equity and debt targets on their own

Full deferral means buying replacement real estate worth at least your net sale price, reinvesting all net proceeds and replacing any debt paid off, as set out in reinvest the whole sale price or the gain. With a unit you occupy, those tests are run against the rental share, not the whole purchase price.

Allocate the price between units by relative value or square footage, and record it in the purchase documents and your files. Publication 527 already requires the same split for expenses on a duplex where you live in one half and rent the other.

Liabilities count as money under Reg. section 1.1031(d)-2, so debt you paid off on the property you sold must be matched by debt or added cash on the rental share.

Worked example: a $600,000 exchange into an $800,000 fourplex with one owner-occupied unit

Hypothetical, round figures. You sold a rental for $600,000 net with no debt and a $250,000 realized gain. You buy an $800,000 fourplex of four equal units and plan to live in one, so the rental share is $600,000 and your unit is $200,000.

If the $600,000 of exchange money is applied to the three rental units and your own $200,000, from savings or a loan, pays for your unit, the rental share equals your proceeds and the gain is deferred.

If instead the money is spread across all four units in proportion, a quarter of the exchange funds, $150,000, has paid for your home. That $150,000 would be boot and taxable, since it is less than the $250,000 gain. Run your own numbers with your CPA.

• Rental share at $600,000 matches the net proceeds.
• Your unit is paid for with outside money, not exchange funds.
• Worst case if the money is spread across all four units: $150,000 recognized.

How to set it up so the split holds up

Agree the per-unit allocation before closing and have the closing statement show exchange funds applied to the rental share. The regulations do not say how a single price paid with exchange money, a loan and your own cash is traced to particular units, so ask your CPA whether your documentation supports it, and plan for the worst case above.

Rent the other units at fair rent from the start and keep leases and deposits in order; heavy personal use of a rental unit can undercut investment intent. The dwelling-unit safe harbor in Rev. Proc. 2008-16 measures personal use per unit.

Expect a long hold. Section 121(d)(10) denies the home-sale exclusion for five years after you acquire property in an exchange, which matters if you later move into more of the building; see moving into a 1031 replacement.

Splitting the exchange is the alternative when the home part is large

If your unit would be a big share of the purchase, consider buying the home with your own money and placing the full exchange proceeds in investment property elsewhere. That keeps the exchange clean and the home fully personal.

A Delaware Statutory Trust interest, accepted as real property by Rev. Rul. 2004-86, can absorb all or part of the proceeds without any landlord work; see splitting an exchange between a DST and direct property. Trust interests are illiquid and carry sponsor fees and property risk.

For buying a small multifamily as a replacement, the lending line at four units and other features are in the duplex and fourplex guide.