Going over how to fill out your residential homestead tax exemption application for Collin County. The typical deadline for filing a Collin County homestead exemption application is between January 1 and April 30.Today we're actually applying and doing the homestead filing so you know how it gets done. Org or call 469-742-9200. Homestead Exemption Applications. 776. 4,750. 73. 4,722. "It's probably climate change affecting everything," said shop owner Debbie Collins. "I'm sure it's added to it, made this happen. 88 votes, 83 comments. Collin County is drastically increasing tons of appraisals.