COLA Ledger

An independent reference — not affiliated with the Social Security Administration. Every figure traced to the government publication that produced it.

The 1990 Social Security COLA — 4.7%

Cost-of-living adjustment, 1990

4.7%

This adjustment was determined in 1989, took effect with benefits payable for December 1989, and first reached checks in January 1990.

Determined in
1989December-effective
First in a check
January 1990
Comparison quarter
Q3 1989CPI-W 123.3
Base quarter
Q3 1988CPI-W 117.8

SSA’s own table lists this adjustment under 1989, the year it was determined. The public name it by the year it reaches a check, which is one later. This site uses the name people search for. Why the two labels disagree.

The CPI-W values behind the 4.7%

Every adjustment is an average of three monthly index readings against an average of three others. These are the six values, as the Bureau of Labor Statistics published them for series CWUR0000SA0 — all items, U.S. city average, not seasonally adjusted.

CPI-W monthly index values and quarterly averages behind the 1990 adjustment
QuarterMonthCPI-W index
Base — Q3 1988July 1988117.200
August 1988117.700
September 1988118.500
Base quarter average117.8
Comparison — Q3 1989July 1989123.200
August 1989123.200
September 1989123.600
Comparison quarter average123.3

The quarterly averages are rounded to the nearest tenth — the precision the determination-1989 notice specifies — and the percentage increase between them is then rounded to the nearest tenth of a percentage point. That gives 4.7%.

Reproduced from the raw index

Recomputing this adjustment from the committed CPI-W series returns 4.7%, matching SSA’s published figure. That check runs on all 51 determinations as a blocking build gate, so no page here can ship a figure the arithmetic does not support.

What 4.7% did to a benefit

Monthly benefit amounts are floored to the whole dollar after the adjustment is applied, which is why these figures are not simply the percentage multiplied out.

Effect of the 1990 adjustment on two benchmark monthly benefits
Monthly benefit beforeAfter the adjustmentMonthly increaseOver a year
$1,000$1,047+$47+$564
$2,000$2,094+$94+$1,128

The 1990 figures this adjustment set

Most Social Security parameters move with the adjustment or with the national average wage index. These are the committed values for 1990, each traced to the government table it came from.

Committed Social Security and Medicare parameters for 1990
Parameter1990
Maximum earnings subject to Social Security tax$51,300
SSI federal payment rate — individual$386
SSI federal payment rate — couple$579
Earnings needed for one Social Security credit$520
Retirement earnings test — under full retirement age$6,840
Retirement earnings test — year of full retirement age$9,360
Substantial gainful activity — non-blind$500
Substantial gainful activity — blind$780
Trial work period — a service month$200
First PIA bend point (eligibility at 62 this year)$356
Second PIA bend point (eligibility at 62 this year)$2,145

Where to go next

Sources and freshness

Figures effective December 1989. Page figures last verified against the sources above on 10 August 2026. BLS data retrieved 10 August 2026. BLS.gov cannot vouch for data or analyses derived from these data after retrieval. Corrections: the correction log · support@inventum.com.au