The science: why pre-service tipping backfires
Tipping fatigue is not irrational. A landmark 2025 study by Demi Shenrui Deng
(Auburn University), Lu Lu (Temple University), and Ruiying Cai (Washington State
University) — published in the International Journal of Hospitality Management —
ran two consumer experiments (N = 320 and N = 414) to measure how tipping requests
in “emerging tipping contexts” like coffee shops affect consumer emotions, perceived
tip deservingness, and decision satisfaction.
The findings were clear: requesting tips before service is delivered triggers
negative emotions — discomfort, uncertainty, and a feeling that the tip is
undeserved. The effect was significantly worse at the pre-service stage
(when you are paying at the register before your drink is made) compared to
post-service (after you have received your order).
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The problem isn't that people don't want to tip — it's that they are being asked to tip in situations where service hasn't yet occurred or where human interaction is minimal.
Lu Lu, Temple University, International Journal of Hospitality Management (2025)
This maps to a well-established principle in tipping research. Cornell University’s
Michael Lynn has studied tipping behavior for three decades. His meta-analysis found
that tips correlate weakly with service quality — a mean correlation of just
r = 0.11. Social pressure, not service evaluation, drives tipping
behavior. The iPad screen maximizes that pressure by making the decision public,
timed, and observed.
The Deng, Lu, and Cai study also identified a remedy: visible service
efforts. When customers could see employees actively making their drinks,
the negative emotional response to the tip prompt diminished significantly. The
problem is not the tip itself — it is the timing. Being asked to evaluate
and reward a service that has not happened yet violates our basic sense of
transactional fairness. This connects to the same payment
anxiety that makes the check moment uncomfortable at sit-down restaurants.
Sources: Deng, Lu & Cai, “Rethinking tipping request,”
International Journal of Hospitality Management (2025);
Lynn & Sturman, “Tipping and Service Quality,”
Journal of Hospitality & Tourism Research (2010)