How to Claim Your First Time Homebuyer Tax Credit using form 5405 (Extended Deadline) – This is a place for the community to provide tips and advice on How to Claim Your First Time Homebuyer Tax Credit using form 5405 (Extended Deadline). This topic was created by ruthiej and the tips are provided by the community. The tips you add here can be your own or referred from another site. The best tips are then ranked at the top when up-voted by members of the community.