noun
advance payment on behalf of a third party (with expectation of reimbursement)
Used in business or formal contexts when one party pays expenses for another and later seeks reimbursement. Often appears in accounting or expense-related documents.
出張旅費は会社が立替払いしてくれます。
The company will make an advance payment for business trip expenses on my behalf.
立替払いの精算は月末に行います。
Reimbursement of advance payments will be processed at the end of the month.
Compound of 立替 (たてかえ, 'advance payment') + 払い (はらい, 'payment'). The reading たてかえばらい is a straightforward combination of the two components.