ROSENBLATT, J.:

After a bank makes a statement of account available to its customer, the customer has one year to assert claims against the bank for negligently paying checks bearing alterations or forged signatures of the customer (see, UCC 4-406[4]). We are asked to determine when the one-year period begins to run where, owing to the actions of a single wrongdoer, a bank charges its customer's account for a series of checks paid over a span of several years. Does the first statement of account start the clock for all future claims arising from that wrongdoer's repeated actions or does each statement carry a one-year period of its own? We conclude that each statement carries its own one- year period.

Plaintiff, a physician, maintained a checking account with Fleet Bank. From 1988 through May 10, 1995, his bookkeeper purportedly embezzled money by forging plaintiff's name on his checks or altering the names of payees. During this period, the bank regularly furnished plaintiff with statements of account and canceled checks. Plaintiff reported the embezzlement to the bank on May 18, 1995, the day after he discovered it. He then sued the bank, alleging that it was negligent in paying the forged or altered checks.

In its defense, the bank asserted that UCC 4-406(4)'s one-year period had expired in 1989, thus barring all of plaintiff's claims. Supreme Court disagreed and held that each statement of account that the bank sent to plaintiff carried its own one-year period, thereby sustaining the claims arising within one year prior to May 18, 1995. Agreeing with the bank, the Appellate Division modified Supreme Court's order and dismissed all of plaintiff's claims. We granted plaintiff leave to appeal and now reverse and reinstate the order of Supreme Court.

This case is governed by Article 4 of the Uniform Commercial Code. In addressing the relationship between a payor bank and its customers, Part 4 of Article 4 imposes a series of duties and shifting burdens as to the risk of loss for forged or altered checks (see, UCC 4-401 to 4-408; see generally, 2 White & Summers, Uniform Commercial Code, §§ 19-6, 21-1 to 21-7 [Practitioner's 4th ed]).

The Uniform Commercial Code fastens strict liability on a bank that charges against its customer's account any "item" that is not "properly payable" (see, UCC 4-401; see also, Woods v MONY Legacy Life Ins. Co., , 84 NY2d 280, 283; Putnam Rolling Ladder Co. v Manufacturers Hanover Trust Co., , 74 NY2d 340, 345; Kosic v Marine Midland Bank, 76 AD2d 89, 91, affd , 55 NY2d 621). A check bearing a forgery of the customer's signature is an "item" not "properly payable" and therefore may not be charged against the customer's account (see, UCC 3-404[1], 4-104[g], 4- 401[1]; Putnam Rolling Ladder Co. v Manufacturers Hanover Trust Co., 74 NY2d, at 345, supra).

The Uniform Commercial Code goes on, however, to impose certain reciprocal duties on the customer, which limits the bank's strict liability exposure. Pursuant to UCC 4-406(1), a customer must (i) "exercise reasonable care and promptness to examine" statements of account and included items to discover his or her "unauthorized signature or any alteration on an item" and (ii) "notify the bank promptly after discovery thereof." A customer who fails to comply with these duties, with respect to an item appearing in a statement of account, is precluded from raising certain allegations against a bank (see, UCC 4-406[2]).

This preclusion, however, is not absolute. Even a customer failing in these duties may bring a claim against the bank if the customer can establish that the bank lacked ordinary care in paying the check (see, UCC 4-406[3]). In this context, UCC 4-406(4) provides that a customer whose claim is not precluded by UCC 4-406(2) has "one year from the time the statement and items are made available to the customer" for asserting claims against a bank for an unauthorized signature of the customer or an alteration to the face or back of a check (see, UCC 4-406[4]).

In the case before us, the items purportedly forged or altered by the bookkeeper appear in successive statements of account over a seven-year period. Although the Uniform Commercial Code sets the one-year statutory limit to run from the time "the statement" becomes available to the customer, UCC 4- 406(4) does not state when the one-year period begins to run in situations where forged or altered items by the same wrongdoer appear in successive statements of account.

Plaintiff argues that each successive statement of account carries its own one-year period. If so, plaintiff may still assert claims for forged or altered checks reported in statements made available to him between May 18, 1994 and May 18, 1995 -- assuming, of course, he can also establish that the bank failed to exercise ordinary care in paying the checks during that period (see, UCC 4-406[3]).

The bank, by contrast, argues that UCC 4-406(4)'s one- year period begins to run when a customer receives the first statement of account containing an unauthorized signature of the customer or an altered item. Under this interpretation plaintiff would be barred from asserting claims against the bank for any of his bookkeeper's forgeries or alterations, because plaintiff's statements of account reflected these forgeries or alterations as early as 1988.

The bank relies upon a portion of Official Comment 5 to UCC 4-406, which states that "there is little excuse for a customer not detecting an alteration of his own check or a forgery of his own signature." This phrase, however, must be read in its broader context, which is to explain the difference between the time limit for reporting altered checks or forgeries of a customer's own signature and the time limit for reporting unauthorized indorsements. The Comment emphasizes that it is far easier for customers to spot -- and therefore more promptly report -- alterations on their checks or forgeries of their own signatures, as opposed to unauthorized indorsements, which involve signatures of third parties. Accordingly, the period for reporting the former is one year, the latter, three (UCC 4- 406[4]).