Fees for revoked MCC?

I am in Austin, Texas and got my MCC through the city housing authority when I bought my town home in 2007. It has really been a blessing. 2013 will be the last year I can claim the credit as I got married and our combined income will now exceed the credit limits. My husband and I are considering buying a new home in 2014 and keeping the current townhouse as a rental. The research I found says that if it is no longer my primary residence, then the MCC will be revoked. However, I cannot find any information about any fees associated with the revocation as there are with the recapture tax with the sale of a home. I am grateful for any guidance.