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The uncertainties involved in the calculation of bottom quark (b-quark) crosssections in deep-inelastic scattering at HERA are studied in different phase space regions. Besides the inclusive b-quark cross-section, definitions closer to the detector acceptance requiring at least one high energetic muon from the semi-leptonic b-quark decay or a jet with high transverse energy are investigated. For each case the uncertainties due to the choice of the renormalisation and factorisation scales as well as the b-quark mass are estimated in the perturbative NLO QCD calculation and furthermore uncertainties in the fragmenation of the b-quark to a B-meson and in its semi-leptonic decay are discussed.

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