I do quite a few tax appeals and I always use a GP form. I do not (and legally can not)represent the clients,I can only explain my appraisal report and point out mistakes in the tax assessment.
Having worked as a tax assessor I have seen appraisers submit URAR's and even 704's in tax appeals. This is a mistake since lending forms were not designed for litigation purposes.
The best advice I can give an appraiser seeking to become involved in tax appeal work is to learn the rules in your jurisdiction.
Good advice!
I too have been on both sides of the fence. If you are a Licensed or Certified Appraiser be careful you only represent your appraisal ~ as others have said, in a hearing, you should not advocate for the owner to get a lower value, but only your appraisal and the methodology, and that can be a slippery slope.
When I was on the Assessment side of the fence, generally speaking, most of the lowered valuations were made only for homeowner's who could prove factual errors; e.g. too high square footage, wrong unfinished area, wrong bed/bath room count, over stated condition, obsolescences, recent arms length sales price, or current street or subdivision listings, etc. (Condition proof must be with pix, or square footage w/blueprints, or APEX type full sketch, etc). Whiners usually would get the boot...
IMHO, from a homeowner's perspective, most assessment reductions, however, usually did not justify the hiring of an attorney, tax rep, or even a full fee appraiser. Commercial yes; House, no.