ठगायस्थानेभ्यः

Operational rule vidhi

After a word denoting sources of revenue there is the affix ठक् in the sense of 'come thence'.

Word by word (padaccheda)

Substitute / term prathamā · ekavacanaLeft context आयस्थानेभ्यः pañcamī · bahuvacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.

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Full reading

ठक् आयस्थानेभ्यः

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

After a word denoting sources of revenue there is the affix ठक् in the sense of 'come thence'.
The word आय means what is the share appropriated by the lord. The source of आय is called आयस्थान ॥

This debars अण् and छ ॥ Thus शौल्कशालिकः 'what is derived from custom house'. आकरिकम् 'revenue derived from mines'.

The plural in the sutra prevents Svarupavidhi 1.1.68.

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.