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Account receivables are one of the problems faced by companies that provide postpaid or payment at the end of the period. PT PLN (Persero) Pasuruan Customer Service Managing Unit (UP3) is one of the sixteen units that have quite high arrears in the East Java Distribution Main Unit (UID). With a composition of 53% postpaid subscribers from over 900,000 registered customers, accounts receivable that issued every month reach 293 billion Rupiah. Of that value, more than 4.5 billion Rupiah is receivable arrears. Several improvements have been made by PT PLN (Persero) to increase the accounts receivable turnover ratio, such as socialization, cooperation with local governments, installation of banners and others. However, these efforts have not yet gotten optimal results. One other effort that gets pretty good results is by collaborating with third parties through billing officers. From the data obtained, several customer service units have gotten quite good results, but five of the nine customer service units in UP3 Pasuruan have not had satisfactory results. This is because the officers bear too heavy workloads. The research uses the NASA-Task Load Index (TLX) and Rating Scale Mental Effort (RSME) method to measure the mental workload of an officer. Objective research methods are also conducted through Stopwatch Time Study to measure the needs of standard time and calculate Full Time Equivalent (FTE), so that the optimal number of officers can be determined. The results found that the billing personnel had a considerable workload, so the required transfer and the addition of the number of billing officers in some service units.