Type Ia supernova rates determined from the SVISS SNe (black star). The grey star is displaced by + 0.01 in z and show the rate without extinction correction. Also shown is a collection of published rates from the literature. We plot SN Ia rates resulting from assumptions on the delay time distribution combined with the star formation history. Error bars are statistical with total errors (statistical and systematic added in quadrature) as a transparent/faded extra error bar for all surveys. Redshift bin sizes are not shown, but are given in Table 3. The rate from Cappellaro et al. (1999) has been rescaled from SNu to a volumetric rate by assuming a local B-band luminosity density 2.0 × 10⁸ h₇₀ L_⊙ Mpc^-3 at redshift ~0.