I made this exact mistake on my Hill Country lease-to-own negotiation and it nearly wrecked my first year budget. Everyone told me the ag exemption was established on the land, so I'd inherit the lower tax valuation immediately. Wrong. In Texas, if ownership changes and you're a new operator without documented agricultural history on that specific parcel, the county appraisal district can strip the exemption and roll back taxes up to five years on the seller — which they then tried to pass to me through contract language I almost missed.
I had to prove my farming operation from scratch: livestock records, receipts, lease agreements, the works. It took 18 months before the exemption was fully reinstated. My tax burden tripled in the interim.
Nobody at closing — not the title company, not the realtor — flagged this. I had to learn it from a neighbor who'd been burned the same way a decade earlier.
Has anyone else run into appraisal districts interpreting exemption continuity differently county to county? I suspect this varies wildly and the conventional 'it transfers with the land' advice is genuinely dangerous.