No. The deadline for 2012 contributions was April 15, 2013, regardless of filing extensions. However, you can make a 2013 contribution now; you don’t have to wait until the end of the year or even up to April 15, 2014, to do so. The sooner you make the contribution, the sooner you begin to accrue potentially tax-free income.
A sale of property that allows for tax deferment if at least one payment is received after the end of the tax year in which the sale occurs. The installment method does not apply to year-end sales of publicly traded securities. Dealers may not use the installment method. Investors with very large installment balances could face a special tax.