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The Act increases the base standard deduction from the inflation adjusted levels that applied in 2017 to:

$12,000 for Single, Qualifying widower and Married filing separately taxpayers.

$24,000 for married taxpayers filing Joint returns,

$18,000 for taxpayers filing as Head of Household.

The additional standard deduction available to taxpayers who are age 65 or older and or blind remain unchanged.
For 2018 the additional amount is $1,300 for married taxpayers and $1,600 for unmarried taxpayers.

Effective for tax years 2018 through 2025, the deduction for moving expenses is suspended.

The deduction will still be available for active duty members of the Armed Forces who move pursuant to a military order and incident to a permanent change of station.

Gambling losses remain deductible as a miscellaneous itemized deduction (not subject to the 2% limitation) to the extent of gambling winnings.

The Act provides that all deductions for expenses incurred in carrying out wagering transactions, and not just gambling losses, are limited to the extent of gambling winnings.

Pursuant to the Act, for tax years beginning after December 31, 2017 and before January 1, 2026, a deduction will only be allowed for interest on a debt that qualifies as Acquisition Indebtedness. No deduction will be allowed for Home Equity debt.

In addition, the Act reduces the amount of eligible Acquisition Indebtedness borrowing to $750,000 for any debt incurred on or after December 15, 2017.

A taxpayer who entered into a binding contract before December 15, 2017 to close on the purchase of a residence before January 1, 2018, and who actually closes on the acquisition before April 1, 2018, shall be considered to have incurred the Acquisition Indebtedness before December 15, 2017.

ii. The old Acquisition Indebtedness limits continue to apply to taxpayers who refinance existing Acquisition Indebtedness as long as the indebtedness resulting from the refinancing does not exceed the amount of the original debt.

For 2017, the deduction for Qualified Residence Interest was limited to interest paid on up to $1,000,000 of borrowing that qualified as “Acquisition Indebtedness” and up to $100,000 of borrowing that qualifies as “Home Equity Indebtedness”.
Acquisition Indebtedness being defined as debt incurred to acquire, construct or substantially improve a principal residence or a second home, with no restriction on the use of Home Equity Indebtedness.

The combination of residential property taxes and Income or sales taxes is capped at $10,000.

Property taxes remain fully deductible for taxpayers in a business or for-profit activity, so taxes paid on rental realty can be taken in full on Schedule E.

For contributions made in tax years beginning after December 31, 2017 and before January 1, 2026 the 50% limitation is increased to 60%. Any amounts in excess of the new limit can be carried forward and deducted for up to five years (as was allowed under prior law).

For any contribution made in a tax year beginning after December 31, 2016, the requirement of a charity to provide contemporaneous written acknowledgement as substantiation for any contribution of $250 or more is repealed.

Beginning in 2018, no charitable deduction is allowed for any payment to an institution of higher learning in exchange for which the contributor is given a right to purchase seats at an athletic event.

Prior to the enactment of the new law, charitable contributions were deductible with certain ceilings based upon a percentage of AGI. A 50% of AGI limit applied to cash contributions to public charities and certain private foundations.

The rules relating to the exclusion of gain on the sale of a principal residence remained unchanged. $500,000 for married couples and $250,000 for the other filing status.

The $250 (as adjusted for inflation) deduction for eligible educators remains at that level.

For tax years beginning after December 31, 2017 and before January 1, 2026 all miscellaneous itemized deductions that were previously subject to a 2% AGI limitation are suspended.

Among the items included in this elimination are:
All unreimbursed employee business expenses;
Union dues
Brokerage fees
All expenses related to tax return preparation;
Appraisal fees for charitable contributions;
Investment expenses.

For any divorce or separation agreement executed after December 31, 2018, or executed before that date but modified after, alimony payments are not deductible by the payor spouse.

If a pre-existing agreement is modified after December 31, 2018, the new rules will only apply if the modification expressly provides that the new law should be applicable.

Correspondingly, the recipient spouse will not have to include the alimony payments received as income.