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See link to Social Security website:https://www.ssa.gov/OACT/quickcalc/spouse.html
"When a worker files for retirement benefits, the worker's spouse may be eligible for a benefit based on the worker's earnings. Another requirement is that the spouse must be at least age 62 or have a qualifying child in her/his care. By a qualifying child, we mean a child who is under age 16 or who receives Social Security disability benefits.
The spousal benefit can be as much as half of the worker's "primary insurance amount," depending on the spouse's age at retirement. If the spouse begins receiving benefits before "normal (or full) retirement age," the spouse will receive a reduced benefit. However, if a spouse is caring for a qualifying child, the spousal benefit is not reduced.
If a spouse is eligible for a retirement benefit based on his or her own earnings, and if that benefit is higher than the spousal benefit, then we pay the retirement benefit. Otherwise we pay the spousal benefit."
Your spouse can qualify though IF you are receiving your spousal benefit and she is disabled. See link: https://www.ssa.gov/planners/retire/yourspouse.html
'Your husband or wife can also receive a spouse's benefit at any age if he or she is caring for your child who is younger than age 16 or disabled." So yes she can receive 50% of your benefit if she is disabled and you are receiving your benefit or disability benefits.
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