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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 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 2018, the contribution limit for traditional IRAs and Roth IRAs is unchanged at $5,500, or $6,500 for those age 50 or older.

The deduction limit for 2018 contributions to a traditional IRA is phased out for active plan participants with modified AGI (MAGI) between $63,000 and $73,000 for a single person or head of household, or between $101,000 and $121,000 for married persons filing jointly and qualifying widows/widowers.

The phaseout range is MAGI between $189,000 and $199,000 for a spouse who is not an active plan participant and who files jointly with a spouse who is an active plan participant.

The 2018 Roth IRA contribution limit is phased out for a single person or head of household with MAGI between $120,000 and $135,000, and for married persons filing jointly and qualifying widows/widowers with MAGI between $189,000 and $199,000.

If you converted your traditional IRA to a Roth IRA in 2018, you cannot undo it; the conversion is permanent.

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 2018, all taxpayers must use Form 1040.
Forms 1040A and 1040EZ have been eliminated.
Form 1040 has been reformatted and redesigned and is supplemented by new Schedules 1 through 6.

The IRS has taken Form 1040, which was a 2 page form, and cut it into 6 pieces,
If you do not have amounts for pieces 2 through 6, then those schedules will not print.

Section 280F limits the §179 expensing and depreciation deductions (including bonus depreciation) with respect to certain passenger automobiles.

For passenger automobiles placed into service after December 31, 2017 the maximum amount of allowable depreciation is increased to $10,000 for the first year;
$16,000 for the second year; $9,600 for the third year; and $5,760 for the fourth and later years. Each of these amounts will be indexed for inflation in years after 2018.

The maximum first-year bonus depreciation (which was scheduled to reduce to $6,400 in 2018 and $4,800 in 2019) will remain at $8,000.

For property placed into service after December 31, 2017, qualified leasehold improvement, qualified restaurant and qualified retail improvement property will be subject to a 15-year recovery period and straight-line depreciation.

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.

The alternative minimum tax (AMT) exemption amounts are adjusted for inflation. Here’s what those numbers look like for 2019:

Individual = $71,700
Married Filing Jointly = $111,700
Married Filg Separately = $55,850
Estates and Trusts = $25000

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.

Salary reduction deferrals $19,000 for 401(k) or 403(b) and most 457 plans. Catch-up Contributions $6,000

IRA Contributions $6,000 - IRA Catch-up Contributions remains at $1,000.