If you are married filing jointly, you can make a full contribution to a Roth IRA if your income is less than $181,000 ($181,000 - $191,000 for a partial contribution) in 2014 and $183,000 ($183,000 - $193,000 for a partial contribution) in 2015.
https://www.fidelity.com/retirement-ira/ira-rules-faq
If you’re older, you can continue to contribute as long as you work. As long as you have earned compensation, whether it is a regular paycheck or 1099 income for contract work, you can contribute to a Roth IRA—no matter how old you are.
https://www.fidelity.com/viewpoints/retirement/nine-reasons-roth
1. You must be at least 18 to open an IRA at Fidelity. 2. Full deductibility of a contribution for 2015 is available to active participants whose 2015 Modified Adjusted Gross Income (MAGI) is $98,000 or less (joint) and $61,000 or less (single); partial deductibility for MAGI up to $118,000 (joint) and $71,000 (single).
https://www.fidelity.com/retirement-ira/ira-rules-faq
1. Money may grow tax free; withdrawals are tax free, too. You contribute money that has already been taxed (after-tax dollars) to a Roth IRA. There’s no tax deduction on the front end as there can be with a traditional IRA.
https://www.fidelity.com/viewpoints/retirement/nine-reasons-roth
7. Use your contributions at any time. A Roth IRA enables you to take out 100% of what you have contributed at any time and for any reason, with no taxes or penalties. Only earnings in the Roth IRA are subject to restrictions on withdrawals.
https://www.fidelity.com/viewpoints/retirement/nine-reasons-roth
15 Months to Contribute. One quirk in the IRA laws is that you have 15 months to make a contribution for the current tax year. In 2015, for instance, you can make a contribution any time from January 1, 2015 to April 15, 2016 (the tax filing deadline).
http://www.rothira.com/roth-ira-rules
There are income limits for Roth IRAs. As a single filer, you can make a full contribution to a Roth IRA if your income is less than $114,000 ($114,000 - $129,000 for a partial contribution) in 2014 and $116,000 ($116,000 - $131,000 for a partial contribution) in 2015.
https://www.fidelity.com/retirement-ira/ira-rules-faq
2015 Roth IRA Rules-Eligibility, Income, Contribution Limits, and More. Note: The article below refers to the 2015 tax year. Assuming your IRA was opened by Dec. 31, 2015, you have until the tax filing deadline–April 15, 2016–to make a 2015 contribution. The income/contribution limits may increase for the 2016 tax year. Click here for current contribution limits. When it comes to a Roth IRA, “rules” is a subjective term.
http://www.rothira.com/roth-ira-rules
Withdrawals from Roth IRAs are federal income tax free and penalty free if a five-year “aging” period has been met (if a withdrawal is made after a five-year period, beginning with the first taxable year after a contribution to any Roth IRA was made), and the account owner is age 59½ or older, disabled, or deceased.
https://www.fidelity.com/viewpoints/retirement/nine-reasons-roth
Many factors can affect your eligibility and contribution limits to either the Traditional IRA or Roth IRA — tax filing status, your current earned income level and whether or not you participate in a retirement plan at work.
https://www.calcxml.com/calculators/ira-calculator
how much money do i need to make to contribute to a roth ira
To a roth ira you need to contribute less than $114,000 or between $114,000  and $129,000 for a partial contribution in 2014 and $116,000 or between $116,000  and $131,000 for a partial contribution in 2015. You need to make less than $114,000 in 2014 and $116,000 in 2015 to contribute in a Roth Individual Retirement Account.