Trustworthiness becomes visible through consistency across inconvenient circumstances.

Anyone can be honest when it is free. What actually tells people who you are is what happens when honesty is expensive, when the truth costs you a sale, an advantage, or an easier evening. Consistency across those situations is what makes the word mean anything, because that is where most people quietly make exceptions. The inconvenient case is the only real test.

Notice your own exceptions, the situations where you round things off differently. Pick one and hold the line there this month even though it costs you. That is where the reputation is actually made.