We track our spending using Mint so I have a good idea of what our actual spending is. Sometimes things don't seem to get fully/correctly accounted for in Mint though and, of course, there is cash. Is there an easy way to double-check your spending by backing into the number? I was thinking of taking our salaries as the starting point (we don't have rental income and dividends are reinvested) and then subtracting out savings/investments, federal/state tax, FICA, etc. to get to the number. Is there an easier way to arrive at that number by looking at my last year's tax form? I was thinking one of the lines might represent that number.

Thanks in advance!