Each week in our Ask the Editor series, Joy Taylor, The Kiplinger Tax Letter editor, answers questions on topics submitted by readers. This week, she's looking at four questions on available tax breaks for retirees with a side hustle. ( Get a free issue of The Kiplinger Tax Letter or subscribe .) 1. Medicare premiums Question: I am 72 years old, and I pay monthly Medicare premiums . I retired from my full-time job four years ago. I am now a part-time consultant and file Schedule C , reporting my income and deductions from my part-time gig, with my federal tax return. My financial advisor said I can deduct my Medicare premiums that I pay, even though I don't itemize on Schedule A . Is that true? Joy Taylor: Yes. As a general rule, medical expenses , including premiums paid for medical insurance and Medicare premiums, are deductible only by itemizers on Schedule A, and only to the extent that total medical expenses exceed 7.5% of adjusted gross income .…