Comparing 12-month term deposit rates
Alex wants to invest $50,000 for 1 year. He uses the comparator and finds Bank A offers 5.10%, Bank B 4.75%, and Credit Union X 5.35% (at maturity; no fees).
By choosing the 5.35% rate, Alex earns $2,675 in gross interest vs $2,375 at 4.75%. After tax (30% marginal rate), the difference is $210 more per year. Over several years or larger deposits, this difference compounds further.