Because of the way it is used in databases, Null has some unique characteristics: 1  Expressions involving Null always result in Null. Thus, Null is said to propagate through expressions; if any part of the expression evaluates to Null, the entire expression evaluates to Null.
If the total amount of itemized deductions is more than the standard deduction, a taxpayer can choose to benefit by itemizing. Standard Deduction. Standard deduction, on the other hand, is a particular amount that is deducted to decrease the amount of income chargeable to tax. The deductible amount depends entirely on the filing status of a taxpayer, and increases every year to incorporate the effect of inflation.
Other than above-the-line deductions covered above, the rest are tax breaks you can only take if you itemize. In effect, by itemizing you're foregoing the standard deduction (you canât get both), and opting to take the specific deductions you list on your tax return. Some of the more common itemized deductions include: 1  Mortgage expense â This can include mortgage interest and mortgage insurance premiums. 2  Other taxes â You may be able to deduct the amount youâve paid previously for personal property taxes, state and local taxes and real estate taxes.