The largest component of OASDI is the payment of retirement benefits. Throughout a worker's career, the Social Security Administration keeps track of his or her earnings. The amount of the monthly benefit to which the worker is entitled depends upon that earnings record and upon the age at which the retiree chooses to begin receiving benefits. For the entire history of Social Security, benefits have been paid almost entirely by using revenue from payroll taxes. This is why Social Security is referred to as a pay-as-you-go system. In approximately a decade (2019), payroll tax revenue is projected to be insufficient to cover Social Security benefits and the system will begin to withdraw money from the Social Security Trust Fund. The existence and economic significance of the Social Security Trust Fund is a subject of considerable dispute because its assets are special Treasury bonds; i.e., the money in the trust fund have been loaned back to the federal government to pay for other expenses (hence it is said that the fund consists of nothing but "IOUs").

The Supreme Court decided, in Flemming v. Nestor (1960), that "entitlement to Social Security benefits is not a contractual right". In that case, Ephram Nestor, a Bulgarian immigrant to the United States who made contributions for covered wages for the statutorily required "quarters of coverage" was nonetheless denied benefits after being deported in 1956 for being a member of the Communist party. In simple terms, the decision means that Congress can cut benefits at any time.

Primary insurance amount

A worker's retirement income benefit is based on his PIA (primary insurance amount). The PIA is based on the average of the highest 35 years of the worker's covered earnings (before deduction for FICA). Covered earnings in any year are limited by that year's Social Security Wage Base, the maximum earnings that could be subject to the OASDI portion of FICA payroll tax ($102,000 in 2008 [20]). If the worker has fewer than 35 years of covered earnings, zeros are used to bring the total number of years of earnings up to 35. Years of covered work more than 2 years before the year the worker turns 62 are indexed upward to reflect the increase in the national wage via the average wage index (AWI) from the time at which the earnings were covered in the past to the value of the AWI two years before the worker turns 62 (which is the most recent year available at the date the worker turns 62). One-twelfth of this 35-year average is the average indexed monthly earnings (AIME). The PIA then is 90% of the AIME up to the first (low) bendpoint, and 32% of the excess of AIME over the first bendpoint but not in excess of the second (high) bendpoint, plus 15% of the AIME in excess of the second bendpoint. This PIA is then adjusted by automatic cost-of-living adjustments annually starting with the year the worker turns 62. Similar computations based on career average earnings determine disability and survivor benefits. These alternate computations average less years of earnings when the worker dies or is disabled before age 62 and use different base years for the inflation adjustments.

Normal retirement age

Main article: Retirement Insurance Benefits

The earliest age at which (reduced) benefits are payable is 62. Full retirement benefits depend on a retiree's year of birth.[21] Those born before 1938 have a normal retirement age of 65. Normal retirement age increases by two months for each ensuing year of birth until the 1943 year of birth, when it stays at age 66 years until the year of birth 1955. Thereafter the normal retirement age increases again by two months for each year ending in the 1960 year of birth, when normal retirement age stops at age 67 for all born thereafter.

A worker who starts benefits before normal retirement age has their benefit reduced based on the number of months before normal retirement age they start benefits. This reduction is 5/9 of 1% for each month up to 36 and then 5/12 of 1% for each additional month. This formula gives an 80% benefit at age 62 for a worker with a normal retirement age of 65, a 75% benefit at age 62 for a worker with a normal retirement age of 66, and a 70% benefit at age 62 for a worker with a normal retirement age of 67.

A worker who delays starting retirement benefits past normal retirement age earns delayed retirement credits that increase their benefit until they reach age 70. These credits are also applied to their widow(er)'s benefit. Children and spouse benefits are not affected by these credits.

The normal retirement age for widow(er) benefits shifts the year-of-birth schedule upward by two years, so that those widow(er)s born before 1940 have age 65 as their normal retirement age.

Spouse's benefit

Any current spouse is eligible, and divorced or former spouses are eligible generally if the marriage lasts for at least 10 years. (State marriages of same sex couples are not recognized by OASDI for spousal benefits because the federal DOMA law excluded them for federal recognition for federal rights.±) While it is arithmetically possible for one worker to generate spousal benefits for up to five of his/her spouses that he/she may have, each must be in succession after a proper divorce for each after a marriage of at least ten years. Because age 70 is the latest retirement age, and because no state recognizes marriage before teenage years, there are no more than 5 successive spousal benefits in ten-year intervals. This spousal retirement benefit is half the PIA of the worker; this is different from the spousal survivor benefit, which is the full PIA. The benefit is the product of the PIA, times one half, times the early-retirement factor if the spouse is younger than normal retirement age. There is no increase for starting spousal benefits after normal retirement age. This can occur if there is a married couple in which the younger person is the only worker and is more than 5 years younger. Only after the worker applies for retirement benefits may the non-working spouse apply for spousal retirement benefits.

Note that, since the passage of the Senior Citizens' Freedom to Work Act, in 2000, the spouse and children of a worker who has reached normal retirement age can receive benefits on the worker's record whether the worker is receiving benefits or not. Thus a worker can delay retirement without affecting spousal and children's benefits. The worker may have to begin receipt of benefits, to allow the spousal/children's benefits to begin, and then subsequently suspend his/her own benefits in order to continue the postponement of benefits in exchange for an increased benefit amount. [citation needed]

Widow's benefits

If a worker covered by Social Security dies, a surviving spouse can receive survivors' benefits. In some instances, survivors' benefits are available even to a divorced spouse. A father or mother with minor or disabled children in his or her care can receive benefits which are not actuarially reduced. The earliest age for a nondisabled widow(er)'s benefit is age 60. The benefit is equal to the worker's full retirement benefit for spouses who are at, or older than, normal retirement age. If the surviving spouse starts benefits before normal retirement age, there is an actuarial reduction. If the worker earned delayed retirement credits by waiting to start benefits after their normal retirement age, the surviving spouse will have those credits applied to their benefit. [22]

Children's benefits

Children of a retired, disabled or deceased worker may receive benefits as a "dependent" or "survivor" if they are under the age of 18, or between 18 and 19 and have not yet graduated from high school, or are over the age of 18 and were disabled before the age of 22.[22]

Disability

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A worker who has worked long enough and recently enough (based on "quarters of coverage" within the recent past) to be covered can receive disability benefits. These benefits start after five full calendar months of disability, regardless of his or her age. The eligibility formula requires a certain number of credits (based on earnings) to have been earned overall, and a certain number within the ten years immediately preceding the disability, but with more-lenient provisions for younger workers who become disabled before having had a chance to compile a long earnings history.

The worker must be unable to continue in his or her previous job and unable to adjust to other work, with age, education, and work experience taken into account; furthermore, the disability must be long-term, lasting 12 months, expected to last 12 months, resulting in death, or expected to result in death.[23] As with the retirement benefit, the amount of the disability benefit payable depends on the worker's age and record of covered earnings.

Supplemental Security Income (SSI) uses the same disability criteria as the insured social security disability program, but SSI is not based upon insurance coverage. Instead, a system of means-testing is used to determine whether the claimants' income and net worth fall below certain income and asset thresholds.

Severely disabled children may qualify for SSI. Standards for child disability are different from those for adults.

Disability determination at the Social Security Administration has created the largest system of administrative courts in the United States. Depending on the state of residence, a claimant whose initial application for benefits is denied can request reconsideration or a hearing before an Administrative Law Judge. Such hearings sometimes involve participation of a vocational expert (VE) or medical expert (ME), both independent, unbiased witnesses, as called upon by the ALJ.

Reconsideration involves a re-examination of the evidence, and the opportunity for a hearing before a (non-Attorney at law) disability hearing officer. The hearing officer then issues a decision in writing, providing justification for his/her finding. If the claimant is denied at the reconsideration stage, (s)he may request a hearing before an Administrative Law Judge. In some states, SSA has implemented a pilot program that eliminates the reconsideration step and allows claimants to appeal an initial denial directly to an Administrative Law Judge.

Because the number of applications for Social Security is very large (approximately 650,000 applications per year), the number of hearings requested by claimants often exceeds the capacity of Administrative Law Judges. The number of hearings requested and availability of Administrative Law Judges varies geographically across the United States. In some areas of the country, it is possible for a claimant to have a hearing with an Administrative Law Judge within 90 days of his/her request. In other areas, waiting times of 18 months are not uncommon.

After the hearing, the Administrative Law Judge (ALJ) issues a decision in writing. The decision can be Fully Favorable (the ALJ finds the claimant disabled as of the date that (s) he alleges in the application through the present), Partially Favorable (the ALJ finds the claimant disabled at some point, but not as of the date alleged in the application; OR the ALJ finds that the claimant was disabled but has improved), or Unfavorable (the ALJ finds that the claimant was not disabled at all). Claimants can appeal Partially Favorable and Unfavorable decisions to Social Security's Appeals Council, which is in Virginia. The Appeals Council does not hold hearings; it accepts written briefs. Response time from the Appeals Council can range from 12 weeks to more than 3 years.

If the claimant disagrees with the Appeals Council's decision, (s)he can appeal the case in the federal district court for his/her jurisdiction. As in most federal court cases, an unfavorable district court decision can be appealed to the appropriate appellate circuit court, and an unfavorable appellate court decision can be appealed to the United States Supreme Court.