Social Security plays a major role in retirement planning for millions of Americans, but many workers do not realize that one hidden rule can quietly reduce their monthly benefit.
The 35-year rule is one of the most important parts of the Social Security benefit formula, especially for people with shorter work histories.
To calculate retirement benefits, the Social Security Administration reviews a worker’s earnings history and uses the highest 35 years of covered earnings.
These earnings are adjusted for wage growth and then averaged to calculate what is known as Average Indexed Monthly Earnings.
If a person worked fewer than 35 years, Social Security does not simply ignore the missing years. Instead, it counts those years as zero-income years, which can lower the average and reduce the monthly retirement check.
Why Fewer Than 35 Years Can Lower Benefits
Workers must earn at least 40 work credits to qualify for Social Security retirement benefits. In most cases, this means working for at least 10 years. In 2026, one work credit equals $1,890 in covered earnings, and workers can earn up to four credits per year.
However, qualifying for benefits and receiving a strong monthly benefit are two different things. A person may qualify after 10 years of work, but if they have fewer than 35 years of earnings, the missing years are added as zeros in the calculation.
This can especially affect people who left the workforce to raise children, care for family members, deal with health issues, or switch careers.
Over a long retirement, even a small monthly reduction can add up to thousands of dollars in lost income.
Working Longer May Increase Your Social Security Check
One way to reduce the impact of the 35-year rule is to continue working until you have at least 35 years of covered earnings. Once you reach that point, there are no zero-income years in the formula.
Working beyond 35 years can still help. If your current earnings are higher than your earlier earnings, Social Security may replace one of your lower-income years with a higher-income year. This can raise your average earnings and possibly increase your monthly benefit.
For workers approaching retirement, this means even a few extra years of work could improve their future Social Security income, especially if they are earning more now than they did early in their career.
Spousal Benefits May Help Married Workers
Married workers with shorter work histories may have another option: spousal benefits. Social Security allows eligible spouses to receive up to 50% of their partner’s full retirement age benefit if that amount is higher than their own benefit.
This can be especially helpful for spouses who spent years outside the paid workforce because of caregiving or family responsibilities. However, there are important rules.
A spouse generally cannot claim spousal benefits until the other partner has filed for their own retirement benefit.
Couples should review both earnings records before filing, because the timing of one spouse’s claim can affect the other spouse’s benefit options.
Divorced Workers May Also Qualify
Divorced individuals may also qualify for benefits based on a former spouse’s record if the marriage lasted at least 10 years and the person has not remarried. This benefit does not reduce the former spouse’s monthly payment.
For people with limited work histories, ex-spousal benefits can provide important retirement support.
Check Your Social Security Earnings Record
Workers should regularly review their earnings history through a My Social Security account at SSA.gov. Missing or incorrect earnings records can lower future benefits.
Errors are usually easier to fix sooner, when tax records and employment documents are still available.
Social Security’s 35-year rule can significantly reduce retirement benefits for workers with shorter earnings histories. Zero-income years lower the benefit average and can affect income for the rest of retirement.
Working longer, correcting earnings records, and reviewing spousal or ex-spousal benefits can help retirees protect their future income.
Anyone nearing retirement should check their Social Security record before filing to avoid losing benefits they may be eligible to receive.