noun
money on hand; ready cash
Refers to the money one currently has available, often used in contexts of spending or losing all of it.
有り金を全部使ってしまった。
I spent all the money I had on hand.
彼は有り金をはたいてその車を買った。
He used up all his ready cash to buy that car.
所持金 is a more formal term for money one is carrying, while 有り金 is colloquial and emphasizes the total available cash.
Compound of 有り (ari, 'existing') + 金 (kane, 'money'), with rendaku voicing of kane to gane.