할부가 · 할부를
installment plan, payment in installments
Example
노트북을 열두 달 할부로 샀어요.
I bought a laptop on a twelve-month installment plan.
Word parts
할 divide+부 pay out
Literally 'dividing up payments.'
Good to know
At Korean checkouts you'll hear 일시불로 하시겠어요, 할부로 하시겠어요? — 'one payment or installments?'