From a quick google:

Income Tax Rate Income Levels for Those Filing As:
Current Tax Act Single Married-Joint
10 - 15% 12% $0-$44,999 $0 - $89,999
25 - 28% 25% $45,000 - $199,999 $90,000 - $259,999
28 - 39.6% 35% $200,000 - $499,999 $260,000 - $999,999
39.6% 39.6% $500,000+ $1M+

The tax plan eliminates itemized deductions except for those on charitable contributions, mortgage interest, property taxes, and retirement savings. But it only allows the mortgage deduction for new mortgages of $500,000 or less.

Hopefully that works out about the same for us, but a significant change in deductions could really screw us.