We actually A/B tested this for several months. Group A we communicated when due and various steps throughout the month with various types of communication, emails, texts, notices, calls etc. Group B we provided zero communication until they were 75 days past due.
Our findings were that by 30 days there was only a 1.8% difference in outcome. At 60 days that difference dropped to 0.9%.
We get a bit sucked in with the logical fallacy of confirmation bias thinking that because money comes in after our efforts then it was the direct results of our efforts. In reality the majority of that would have happened anyway and we just wasted a bunch of effort for very little gains.