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There are three potential reasons why a domain name may not have a year added after a transfer:
This does not make sense because it seems like your domain should get two years: one for the renewal and one more for the transfer. However, this is the operational procedure of the central registry. This is not our policy, we do not get reimbursed by the Registry and gain nothing from only giving you one year. In fact, we have to deal with all the customers upset with this counter-intuitive policy of the central registry.
Here is what ICANN has to say about this situation:
"Registrants who transfer names within the 45-day Auto-Renew Grace Period should check with the registrar from which they are transferring regarding a possible refund. Even though losing registrars receive refunds of auto-renewal fees they have paid to the registry in these circumstances, not all registrars make refunds to customers. The effect of failure of the losing registrar to refund is that the registrant pays registration fees to both the losing registrar (for the auto-renew) and to the gaining registrar (for the transfer), but only receives a one-year extension of term."
(Full text can be found here: http://www.icann.org/announcements/advisory-06jun02.htm)
To avoid this unpleasant situation completely, please start your domain transfers at least 2 weeks before the expiration date.