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incorrect printed information on check stock
Even where national law might allow such a practice, the law in an individual province or state (either for issuing or receiving bank) might not; or if that does then the receiving bank may have its own regulations or compliance practice which may not permit them to accept an altered cheque.  In any case, printed numbers are usually machine-readable, and a corrected cheque would not be.  The question needs a specific answer which addresses the specific circumstances involved (which are not stated, at the time of writing this), but for the general question “Should I alter a printed cheque?” the answer must be no. Cheque numbers are used for identification of the cheque. In many cases, there is no verification of uniqueness and it would be perfectly acceptable simply to use cheques with duplicate numbers: a cheque is merely an order to the bank to make a payment. But you would not be able to identify a particular payment on your statement, and neither would the issuing bank if you wanted one stopped. Where the number is verified as unique, then clearing the payment may be refused or at best delayed in order to be queried. Making an obvious amendment to a cheque’s details is likely to raise a red flag. The receiving bank would not be able to tell if you did it, or the payee; they would not know why. They may suspect that it was done in order to render the cheque unidentifiable [even though the opposite is in fact the case] and refuse to accept it. They may refuse to accept it because it could not be read automatically. Any refusal would sour your relationship with your payees. Presumably your printing house (or your bank, if they printed them) has made the error: raise it with them and have them reprint the batch. Ask your bank what to do with the incorrect cheques: they may want them returned to the bank, or they may be happy for you to keep (and even use) them. If the latter, I suggest you shred them.