Mia wrote: My husband and I are considering a buy to let property and I wondered if this rental income would affect incapacity benefit payments.
Can anyone help me with some advice. 
You need to get advice from an appropriate advisor at your local CAB or Welfare Rights office, as your question is beyond the remit of the Moderators to reply.
You should also seek seek advice with regard to when you are transferred to ESA, and any associated time limiting of benefits.
Gordon