IRA's are individual for each spouse.
If you are covered by a retirement plan at work (usually indicated by a check mark in box 13 on your W-2), then your MAGI might be high enough to limit or eliminate any IRA deduction. See the IRS link below for charts and deduction limits for various filing status and MAGI.
The maximum IRA contributions for 2019 is $6,000, or $7,000 if you’re age 50 or older by the end of the year; or your taxable compensation for the year which ever is less.
(Taxable compensation is generally wages that you worked for - W-2 or net self-employed income minus the deductible part of the SE tax, but can include commissions, certain alimony and separate maintenance, and nontaxable combat pay ).
See IRS Pub 590A "What is compensation" for details:
https://www.irs.gov/publications/p590a#en_US_2018_publink1000230355
See this IRS link for Traditional IRA deduction limits when covered by a retirement plan at work.
https://www.irs.gov/Retirement-Plans/IRA-Deduction-Limits
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
