Oversubscription retention permitted: issuers may retain additional subscriptions subject to prospectus limits, authorization and credit rating. Retention of oversubscription permits an issuer to accept applications beyond the base issue size up to the full base issue size or a lower prospectus-specified limit, subject to corporate authorization, an appropriate credit rating and any other Board-specified conditions. Issuers filing a shelf prospectus may retain oversubscription up to the rated size in that shelf prospectus, while issuers of tax-free bonds without a shelf prospectus are limited to the amount authorised by the tax authority for the year or a lower offer-document limit, subject to the same authorization, rating and regulatory conditions.