If it is a large debt, the company cannot unilaterally write it off from the accounts.
The company must file a civil lawsuit to claim the outstanding amount from the debtor and proceed with enforcement. If the company is unable to enforce the judgment, then the company will have the right to write off the debt from its accounts.
Otherwise, the Revenue Department will not accept it as an uncollectible debt, which will cause issues concerning corporate income tax.
Rujira Bunnag
