Does additional page credit expire at the end of the month/year?
No, additional page credit never expires. Expiration only applies to unused pages that are included in your chosen TrustFax plan. In this way, additional page credit can be used as a ‘buffer zone’ to ensure faxing continuity should you have a particularly busy faxing period but do not wish to upgrade to a higher plan. It is also a good idea to keep additional page credit topped up to facilitate international faxing as needed.