The aim of the study was to evaluate socioeconomic equity in access to surgical services in Finland and to explore the contribution of private sector procedures to any inequities. Data on nine common surgical procedures performed on patients aged 25 and over were obtained from the 1987-88 Finnish Hospital Discharge Register. Socioeconomic indicators were linked to the procedure data by personal identity numbers from the 1987 population census, which was also used to derive the data on population at risk. The study revealed marked differences in rates across socioeconomic categories for several procedures. Some of these disparities are probably explained by variations in need for surgery across socioeconomic groups. However, for cataract operations and hip replacements due to arthrosis or deformity, the surgery rates favoured the better-off, despite low social status being considered a risk factor for these disorders. The correlation or disposable family income with hysterectomy and prostatectomy rates, and the low surgery rates for many procedures in the lowest income quintile also suggested socioeconomic disparities in access to services. The specific effect of private sector seems to have contributed to the socioeconomic differences in rates for, at least, hysterectomy, prostatectomy, and cataract operations. Although the Finnish health care system operates universal coverage without formal barriers to equal access, systematic socioeconomic inequity in the use of individual surgical treatments prevail. Part of these inequities is evidently due to private sector services.