I am deducting the medical fees I paid for my mother, who is 78 and living in her own home, with my itemized medical expenses (I qualify to do this). I’m 55 years old. For 2013, do I apply the 10%- or 7.5%-of-adjusted-gross-income threshold?

Private letter ruling

A written determination issued to a taxpayer by the IRS that interprets and applies the tax laws to the taxpayer’s specific set of facts. A letter ruling advises the taxpayer regarding the tax treatment that can be expected from the IRS in the circumstances specified by the ruling. It may not be used or cited as precedent by another taxpayer.