Catalyzes the NAD(+)-dependent oxidation of formate to carbon dioxide. Formate oxidation is the final step in the methanol oxidation pathway in methylotrophic microorganisms. Has a role in the detoxification of exogenous formate in non-methylotrophic organisms. formate + NAD(+) = CO2 + NADH Homodimer. Induced by formate. Belongs to the D-isomer specific 2-hydroxyacid dehydrogenase family. FDH subfamily.