For a seller, the question is whether an appeal helps your sale. If your assessed value is below market value, which is common for homes with unpermitted renovations, an appeal will not help your sale price and may actually raise your property taxes. If your assessed value is above market value, an appeal can reduce your holding costs while you sell, but it will not directly increase your sale price.
The key insight is that assessed value and market value are different numbers. Assessed value is for tax purposes. Market value is what a buyer pays. A high assessment does not mean your home is worth more on the market, and a low assessment does not mean it is worth less.
If you are planning to sell, focus on market value, not assessed value. Joel Dyck's valuation process gives you the real market number, which is what matters for pricing your sale. Saskatchewan sets the residential percentage of value at 80 percent, so the taxable assessment is always lower than the assessed value printed on your notice.