How to say "billing" in Japanese

• 請求せいきゅうJLPT N3approx.Common
  noun, suru verb, transitive verbCovers billing for a service: demanding or requesting payment for work done. The word is broader than billing, also meaning a claim or demand, so context makes the billing sense clear.
  スミス氏しは損害賠償そんがいばいしょうを請求せいきゅうして彼かれらを告訴こくそした。↗

  Mr Smith sued them for damages.
• 課金かきん
  noun, suru verb, intransitive verbBilling in the sense of charging a fee: the charge levied rather than the bill issued. A less common word; for billing a client for services rendered, 請求 is the usual choice.

For billing as demanding payment for a service, use 請求; for billing as the charging or levying of a fee, 課金 fits, though it is the less common of the two.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 請求せいきゅうclaim
• 課金かきんcharging (a fee)