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We demonstrate the importance of correctly implementing RG-running andchoosing the RG-scale when calculating quantum corrections to inflatondynamics. We show that such corrections are negligible for single-fieldinflation, in the sense of not altering the viable region in the $n_s-r$ plane,when imposing Planck constraints on $A_s$. Surprisingly, this also applies, ina nontrivial way, for an inflaton coupled to additional spectator degrees offreedom. The result relies on choosing the renormalisation scale(pseudo-)optimally, thereby avoiding unphysical large logarithmic correctionsto the Friedmann equations and large running of the couplings. We find that theviable range of parameters of the potential is altered relative to theclassical limit, and we find an upper limit of $g\simeq 10^{-4}$ on the valueof the inflaton-spectator portal coupling still allowing for inflation. And anupper limit of $g\simeq 10^{-5}$ for inflation to correctly reproduce thescalar amplitude of fluctuations $A_s$.

Quantum corrections to inflation: the importance of RG-running and choosing the optimal RG-scale