Got it. Looks like this works. Thank you! That is, I followed your earlier example showing a completed sale. As you suggested, I added both a "gain on sale of asset" and "deferred gain on sale of asset" account. So now for monthly payments I record the payment in the proper amounts (under "interest income" and "promissory note receivable") and then make a journal entry transferring the principal amount paid that month from the "deferred gain on sale of asset" to the "gain on sale of asset" accounts.