Can I exchange part of a DST payout and cash out the rest?

The regulation taxes boot to the extent you receive it, so part cash and part exchange is a partial exchange rather than a failed one

The deferred exchange regulation draws the line at the full amount. Reg. section 1.1031(k)-1(f)(1) provides that gain or loss 'may be recognized if the taxpayer actually or constructively receives money or property which does not meet the requirements of section 1031(a)' before receiving like-kind property, and that only receipt 'in the full amount of the consideration' turns the transaction into a sale. Anything short of the full amount is a partial exchange: the money is boot, the balance is deferred.

Because Rev. Rul. 2004-86 treats you as owning an undivided fractional interest in the trust's real estate, the trust's sale is your sale of that interest, and the regulation applies to your share of the price exactly as it would to a building you sold yourself. What a partial exchange is and the tax on $150,000 of boot, layer by layer cover the general case; this page is about the DST mechanics.

Where the cash comes from decides whether it is boot or a broken exchange: at the trust's closing, yes; from the intermediary on day 60, no

The intermediary safe harbor in Reg. section 1.1031(k)-1(g)(6) requires the exchange agreement to provide that you have no right 'to receive, pledge, borrow, or otherwise obtain the benefits of money or other property' before the end of the exchange period. The regulation then lists the only openings: after day 45 if you have identified nothing; after you have received all the replacement property you are entitled to; or after a material and substantial contingency, provided for in writing and beyond your control, occurs after the identification period.

That rules out the instinctive plan of sending everything to the intermediary and asking for $100,000 back once you see how the market looks. The cash you want to keep has to be disbursed to you at the trust's closing, under instructions in the exchange agreement and to the sponsor's closing agent, with only the exchanged portion wired to the intermediary. How the trust's proceeds reach the intermediary covers the wiring sequence; the split is one more instruction in that sequence.

There is one legitimate later route. If you identify nothing by day 45, the agreement may let you take the whole balance from day 46. That is a full cash-out, not a partial exchange, and it is the fallback rather than the plan.

Debt repaid at the trust's closing is part of the payout too, and it counts against you unless you replace it

A leveraged trust repays its loan from the sale price before anything reaches investors. Your share of that loan is treated, in the Form 8824 instructions for line 15, as 'net liabilities assumed by the other party', reduced by any debt you take on with the replacement and by your exchange expenses. So a trust with 50% leverage hands you half the value in cash and relieves you of the other half in debt, and both halves are measured against the replacement.

If the exchanged part goes into an all-cash trust, the debt relief is boot on top of the cash you kept, unless you add money of your own. If it goes into a leveraged trust at a similar ratio, the replacement debt offsets it. The waterfall that produces your net share is in what happens to the money when a DST sells, and the three doors at full cycle are set out in your DST is going full cycle.

Hypothetical: a $400,000 share, $120,000 kept, and the order in which the kept part is taxed

Round, hypothetical figures. Your share of an all-cash trust's net sale proceeds is $400,000; your carried basis in the interest is $130,000 after $50,000 of depreciation taken since you bought it and the earlier exchanges before that. You keep $120,000 and send $280,000 to the intermediary for a new trust interest.

Realized gain is $270,000. Recognized gain is the lesser of that and the boot, so $120,000, less any exchange expenses you paid. The depreciation layer comes out of that $120,000 first: $50,000 of unrecaptured section 1250 gain taxed at up to 25% under section 1(h)(1)(E), then $70,000 at 15% or 20%, with the 3.8% tax under section 1411 on top where modified adjusted gross income exceeds $250,000 joint or $200,000 single. The ordering is the subject of is boot taxed as recapture or capital gain first.

Your basis in the new $280,000 interest is $130,000 less $120,000 plus $120,000, or $130,000, and the remaining $150,000 of gain is deferred inside it. State tax sits on top of every line. Have your CPA rebuild this on your actual Form 8824 history before you set the split.

Reporting the split, and the minimums that decide how small the exchanged half can be

One Form 8824 reports the whole event: line 15 carries the cash and net debt relief, line 20 the recognized gain, line 24 the deferred gain and line 25 the new basis, as walked through in how to fill out Form 8824. Line 21 is for ordinary recapture, which a straight-line building does not produce. The sponsor's final grantor statement supplies your share of the price, the loan payoff and the closing costs.

Practicality sets the floor. Trust interests on the shelf commonly carry minimums between $100,000 and $250,000, so the exchanged portion has to clear a minimum or go into a whole property or a direct title interest instead. The interest you buy is illiquid until that trust sells and can lose value, so the kept cash is sometimes better treated as your reserve against that than as spending money. The chain itself, trust to trust, is described in exchanging from one DST into another.