theo toi, can cu vao cac nguyen tac chung cua chuan muc ke toan, thi doanh nghiep do khong duoc phep danh gia lai cong cu dung cu va phai ghi nhan vao chi phi phan phan bo gia tri cong cu dung cu mua vao de hach toan vao chi phi, doanh nghiep do chi duoc phep xac dinh lai gia tri tai san khi co su chuyen doi ve hinh thuc so huu, gop von lien doanh hoac cham dut hoat dong (giai the, pha san0. Van de cua ban o day la doanh nghiep dang thieu chung tu hop ly hop le de hach toan vao chi phi khoan chi mua cong cu dung cu. Tuy nhien, nhung cong cu dung cu co gia tri nho thi khong can thiet phai co hoa don tai chinh, con nhung cong cu dung cu co gia tri lon hon 100.000 thi cung kho co the co hoa don tai chinh trong truong hop mua cua cac ca nhan khong co hoa don. De giai trinh voi co quan thue ve tinh hop ly hop le cua cac khoan chi mua cong cu dung cu nay thi ke toan co the lap bang ke mua hang ghi ro ten, tuoi, dia chi, chu ky xac nhan cua nguoi ban, hoac ke toan co the viet hoa don mua hang theo quy dinh tai thong tu 120/2003/BTC, va phai co chugn tu chi cua doanh nghiep(phieu chi, giay de nghi thanh toan) chung minh cho cac khoan chi mua cong cu dung cu nay la co that.