I'm a calendar-year cash-basis taxpayer.
In February 2017, I bought tax-preparation software for my 2016 return. Other deductions have already pushed me above the 2% threshold for 2016.
Do I deduct the cost of 2016 tax-prep software on the 2016 Schedule A, or do I wait and deduct it on the 2017 Schedule A, if I meet the threshold again next year? The Schedule A instructions don't address this point.