<P> Some basic equations for understanding the fund balance include: </P> <Ul> <Li> Fund ending balance for a given year = Fund starting balance + program revenues + interest - program payouts </Li> <Li> Program annual surplus (or deficit if negative) = program revenues + interest - program expenses </Li> <Li> Program annual cash surplus (or deficit if negative) = program revenues - program expenses </Li> </Ul> <Li> Fund ending balance for a given year = Fund starting balance + program revenues + interest - program payouts </Li> <Li> Program annual surplus (or deficit if negative) = program revenues + interest - program expenses </Li>

When was social security trust fund first raided