Increasing the share of the elderly population and prolonging life expectancy leads to the increased need of an increasing number of people who need help in old age. The trends of demographic aging result in various changes in political, economic and social life that pose a challenge in meeting the social needs of older people. Likewise, existing nursing and care systems for the elderly are no longer sustainable due to new challenges in care and changes in the family. An alternative to institutional accommodation is assistance to the elderly in their own home, which has proven to be sustainable and desirable for the elderly, as evidenced by the various incentives of the European Commission for deinstitutionalisation and social inclusion. The social care strategy is of unquestionable importance for the financial and systematic relief of the state. Responding to the needs of the market, the subject of this paper belongs to the area of development of the service activity of providing social care and care for the elderly in one's own home. On a given time base (monthly and quarterly), some of the key business parameters will be monitored and analyzed by numerical methods: number of employees, financial plan, marketing plan, and consumer plan. Objective indicators obtained by numerical methods will indicate the decisions that need to be made for successful business in the selected social care activity, which will serve to develop an optimal strategic plan. The paper will point out the innovation and usefulness of the application of interpolation polynomials in business monitoring and planning, a timely warning for a change in strategy.