A search for a heavy scalar boson $\mathrm{H}$ decaying into a pair of lighter standard-model-like 125 GeV Higgs bosons $\mathrm{h}$ and a search for a heavy pseudoscalar boson $\mathrm{A}$ decaying into a $\mathrm{Z}$ and an $\mathrm{h}$ boson are presented. The searches are performed on a dataset corresponding to an integrated luminosity of 19.7 fb$^{-1}$ of pp collision data at a centre-of-mass energy of 8 TeV, collected by CMS in 2012. A final state consisting of two $\tau$ leptons and two b jets is used to search for the $\mathrm{ H \to h h }$ decay. A final state consisting of two $\tau$ leptons from the $\mathrm{h}$ boson decay, and two additional leptons from the $\mathrm{Z}$ boson decay, is used to search for the decay $\mathrm{ A \to Z h }$. The results are interpreted in the context of both the minimal supersymmetric extension of the standard model and two-Higgs-doublet models. No excess is found above the standard model expectation and upper limits are set on the heavy boson production cross sections in the mass ranges 260 < $m_{\mathrm{H}}$ < 350 GeV and 220 < $m_{\mathrm{A} }$ < 350 GeV.

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