It is important to know that taking control of cash or other proceeds before the exchange is complete may disqualify the entire transaction from like-kind exchange treatment and make ALL gain immediately taxable.
If cash or other proceeds that are not like-kind property are received at the conclusion of the exchange, the transaction will still qualify as a like-kind exchange. Gain may be taxable, but only to the extent of the proceeds that are not like-kind property.
One way to avoid premature receipt of cash or other proceeds is to use a qualified intermediary or other exchange facilitator to hold those proceeds until the exchange is complete.
You cannot act as your own facilitator. In addition, your agent (including your real estate agent or broker, investment banker or broker, accountant, attorney, employee or anyone who has worked for you in those capacities within the previous two years) cannot act as your facilitator.
Be careful in your selection of a qualified intermediary as there have been recent incidents of intermediaries declaring bankruptcy or otherwise being unable to meet their contractual obligations to the taxpayer. These situations have resulted in taxpayers not meeting the strict timelines set for a deferred or reverse 1031 exchange, thereby disqualifying the transaction from Section 1031 deferral of gain. The gain may be taxable in the current year while any losses the taxpayer suffered would be considered under separate code sections.