Sentence:  If you elect to use the <WSD>Standard</WSD> Deduction or the Tax Table , and later find you should have itemized your deductions , you may do so by filing an amended return within the time prescribed for filing a claim for refund . 
Meaning of the word marked with <WSD> tags:  conforming to or constituting a standard of measurement or value; or of the usual or regularized or accepted kind