Ask a CPA

The 3.8% Net investment income tax that applies to high earners stays the same, with identical thresholds.

If you have net investment income (NII), some or all of it will be subject to a 3.8% tax if you have modified adjusted gross income (MAGI) exceeding the applicable threshold.

The same $250,000, $200,000 or $125,000 thresholds for the tax also applies to the tax on NII except for qualifying widows/widowers, who are treated as married persons filing jointly for purposes of the 3.8% tax.

If MAGI exceeds the threshold, the 3.8% tax applies to the lesser of your NII or the MAGI exceeding the threshold.

For tax years beginning January 1, 2019, medical expenses, for all taxpayers, are deductible to the extent that they exceed 10% of youir AGI. It was 7.5% of AGI in 2018.

In addition, the AMT preference related to medical expenses is eliminated.

For 2018, the tax rate on the employee portion of Social Security is 6.2% on wages up to $128,400, so Social Security tax withholdings should not exceed $7,960.80. Medicare tax of 1.45% is withheld from all wages regardless of amount.

On Schedule SE for 2018, self-employment tax of 15.3% applies to earnings of up to $128,400 after the earnings are reduced by 7.65%. The 15.3% rate equals 12.4% for Social Security (6.2% employee share and 6.2% employer share) plus 2.9% for Medicare.

If net earnings exceed $128,400, the 2.9% Medicare rate applies to the entire amount. One half of the self-employment tax may be claimed as an above-the-line deduction on Schedule 1 of Form 1040.

For 2019, the tax bracket amounts have been indexed for inflation.

For tax years beginning after December 31, 2017 and before January 1, 2026, seven brackets will apply to individuals: 10%, 12%, 22%, 24%, 32%, 35% and 37%.

No change has been made to the filing statuses that apply to individuals.

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.

Personal casualty losses occurring in a tax year beginning after December 31, 2017 but before January 1, 2026 are not deductible, unless the loss is incurred as a result of a federally-declared disaster.

The IRS standard business mileage rate for 2018 is 54.5 cents a mile
.
The rate for medical expense and moving expense for certain military personnel deductions is 18 cents a mile.

For charitable volunteers the mileage rate is unchanged at 14 cents a mile.

Pursuant to the Act, the child tax credit is increased to $2,000 per eligible child for 2018 through 2025.

The income level at which the credit phase-out begins is increased to $400,000 for taxpayers filing married filing jointly and $200,000 for all others. The credit continues to phase out at a rate of $50 for every $1,000 that AGI exceeds the threshold amounts.

The refundability of the credit was also modified so that the earned income threshold is reduced to $2,500.

For 2018, the maximum credit amount is $3,461 for one qualifying child, $5,716 for two qualifying children, $6,431 for three or more qualifying children, and $519 for taxpayers who have no qualifying child. The phaseout ranges for the credit have been adjusted for inflation

The PATH Act permanently extended the enhanced $500,000 maximum amount of expensing available (along with the $2,000,000 phase-out threshold) under §179.

Under the new law, for property placed into service in tax years beginning after December 31, 2017, the maximum amount of expensing is increased to $1,000,000, and the phase-out threshold amount is increased to $2,500,000.

For tax years after 2018 these amounts will be indexed for inflation.