2018 IRA Contribution and Deduction Limits –

Effect of Modified AGI on Deductible Contributions If You ARE Covered by a Retirement Plan at Work.

https://www.irs.gov/retirement-plans/plan-participant-employee/2018-ira-contribution-and-deduction-limits-effect-of-modified-agi-on-deductible-contributions-if-you-are-covered-by-a-retirement-plan-at-work

Effect of Modified AGI on Deductible Contributions if You are NOT Covered by a Retirement Plan at Work

https://www.irs.gov/retirement-plans/plan-participant-employee/2018-ira-contribution-and-deduction-limits-effect-of-modified-agi-on-deductible-contributions-if-you-are-not-covered-by-a-retirement-plan-at-work

Note 

The best way to reduce your AGI is making max contributions to employer-based retirement plans and contributing the max to HSA account.

 For a married couple who can reduce your  AGI  below 101,000 can contribute 5500+5500 /year to save more tax and to reduce tax bracket.

Best book to read before you start investing.

The Simple Path to Wealth: Your roadmap to financial independence and a rich, free life

I like audiobook versions of this book

Try Audible and Get Two Free Audiobooks