Every year around April 16, I take the same vow.  Next year, I will become as obsessed with record-keeping as I am with turning off the stove. 
I will enter expenses as I go – into some sort of spreadsheet that calculates it all in neat little deductible categories. I will record every non-reimbursed prescription and every non-cash donation I’ve hauled to Goodwill, assign it a reasonable value, and record the address of the donation center, complete with zip code.