Revenue Recognized But Not Collected
The cash method of accounting recognizes revenue and expenses when cash is exchanged.
Revenue recognized but not collected. Revenue is not recognized because the risks and rewards of ownership have not transferred to the buyer. As monies are collected. Just like revenues expenses are recognized and recorded when cash is paid. Revenues are recognized when earned not necessarily when received.
The revenue for that work should be recognized in 2018. For a seller using the cash method revenue on the sale is not recognized until payment is collected. In other words for each dollar collected greater than 10 000 goes towards your anticipated gross profit of 5 000.