We will be charging you the interest you have accrued from your loan as is stated in this bill.
"We will be charging you"=「当社は請求致します」
"the interest you have accrued from your loan"=「あなたの貸付金の利息を」
("accrued"とは「(利子などから)生じる」という意味です)
("from your loan"の代わりに"from the loan you have taken out from us"(貴社が当社に対する貸付金)と書いてもいいと思います)
"as is stated in this bill"=「この請求書に記載されているように」