Kautilya's Arthashastra 2.8.29

2.8.29

kṛtapratighātāvasthaḥ sūcako niṣpannārthaḥ ṣaṣṭham aṃśaṃ labheta, dvādaśam aṃśaṃ bhṛtakaḥ //

Any informant (súchaka) who supplies information about embezzlement just under perpetration shall, if he succeeds in proving it, get as reward one-sixth of the amount in question; if he happens to be a government servant (bhritaka), he shall get for the same act one-twelfth of the amount.