If you are 50 or older, you can put $6,500 into your Roth IRA: that includes a “catch up” contribution of $1,000. Typical Roth IRA contributions are still limited to $5,500 a year. There are income limits, which you’ll need to be careful about.
One good thing about the new tax law: it raised income limits to qualify for the maximum contribution to a Roth IRA. However, the maximum contribution to a Roth IRA in 2018 is the same as 2017.
Kiplinger’s recent article on this topic asks “How Much Can You Contribute to a Roth IRA for 2018?” In its answer, the article explains that the maximum amount you can contribute to a Roth IRA for 2018 is $5,500, if you're younger than 50. Those age 50 and older can add an extra $1,000 per year in "catch-up" contributions. That is $6,500, which is the maximum contribution amount and the same as 2017.