Revaluation account is debited when there is an increase in the liabilities or a decrease in the assets. It is a loss for the firm. It is credited when there is an increase in the assets and decrease in the liabilities. An increase in the assets or decrease in the liabilities is a gain for the firm. If this amount is lower than the loss faced by the firm, then the loss on such revaluation is shown by crediting the revaluation account to balance both sides of the account.