Distance modulus bias at 20 Mpc as a function of host reddening for Cepheids observed using the optical-NIR Wesenheit function (left) and the TRGB calibrated in the F814W filter (right). Symbols show stars of different temperature, for Cepheids corresponding to pulsation periods of 5, 10, and 60 d (cyan, yellow, and magenta circles, respectively) and for TRGB stars for fiducial T_eff of 4100, 4200, and 4300 K (magenta, yellow, and cyan downward triangles). The solid horizontal line for Cepheids indicates the K correction alone for host reddening corresponding to E(B − V) = 0.20 mag. The dashed horizontal lines illustrate the preferred corrections; for Cepheids, this includes corrections for RLB and the redshifted reddening law, for TRGB stars a halo extinction of E(B − V) = 0.01 mag. The solid black circle in the right panel illustrates the amount of host reddening at which Cepheid and TRGB-based H₀ measurements would become consistent to within their joint 1σ uncertainty. The ordinate of this point is the sum of the 0.012 mag correction applicable to Cepheids and the current 0.065 mag shift required to render both (uncorrected) H₀ measurements consistent with each other to within 1σ.