The benefit taxation thresholds, frozen since 1984

Almost every dollar figure in the Social Security system moves each year. These four do not. They were written into statute and never indexed, and the gap between them and a benefit that rises annually is the entire story of this page.

Single-filer provisional income threshold

$25,000

Set in 1984 and unchanged since. Above it, up to half the benefit becomes taxable.

Single, 50% tier: $25,000set 1984
Single, 85% tier: $34,000set 1993
Joint, 50% tier: $32,000set 1984
Joint, 85% tier: $44,000set 1993

What provisional income is

Provisional income is adjusted gross income plus tax-exempt interest plus half of the Social Security benefit. The thresholds have never been indexed: the 50% thresholds were set in 1984 and the 85% thresholds in 1993, so an ever-larger share of beneficiaries crosses them each year purely through the COLA.

The three components of provisional income
Component	Counted
Adjusted gross income	In full
Tax-exempt interest	In full — municipal bond interest is exempt from tax but not from this test
Social Security benefits	Half

The two tiers

Provisional income thresholds and the maximum taxable portion of the benefit
Filing status	Up to 50% taxable above	Up to 85% taxable above
Single, head of household, qualifying widow(er)	$25,000	$34,000
Married filing jointly	$32,000	$44,000
Married filing separately, lived with spouse	$0	$0

Fifty and eighty-five percent are portions, not rates

Crossing a threshold does not mean paying 50% or 85% tax on the benefit. It means up to that share of the benefit becomes includable in taxable income, where it is then taxed at the ordinary rate. The two get conflated constantly and the difference is large.

The freeze, and what the COLA does to it

The $25,000 and $32,000 thresholds date from 1984; the $34,000 and $44,000 thresholds from 1993. Neither pair has ever been indexed to prices, wages or anything else.

Meanwhile every benefit rises with each cost-of-living adjustment — 2.8% for 2026 — and half of the benefit counts toward provisional income. The threshold stands still while the thing measured against it moves, so each adjustment carries a further slice of beneficiaries across a line drawn decades ago. That is not a side effect of the adjustment; it is the arithmetic consequence of indexing one number and not the other.

For scale: at the published average retired-worker benefit of $2,071 a month, half the annual benefit is $12,426. A single filer with that benefit crosses the first threshold with just $12,574 of other income — a modest pension, or a part-time job, or interest on savings.

What is deliberately not on this page

The 2025 OBBBA temporary senior deduction is out of v1 pending verification against primary text and must not appear in any calculator (SPEC §4.6).

This site also does not compute anyone’s actual tax. The thresholds are published figures and the mechanism is a rule; how much tax a particular person owes depends on facts this site does not have and should not guess at. Check a return against the IRS publication, or with someone who prepares them.

Why there is no rate series for this

Every other rate topic on this site has a history table, because every other rate moves. These four numbers have one value each and have had it for decades. A year-by-year table would be the same row repeated, which is why this is the only page on the topic rather than one of a pair.

Common questions

What is provisional income?

Adjusted gross income, plus any tax-exempt interest, plus half of the Social Security benefit. It is not the same as taxable income and it is not the same as the benefit itself.

How much of the benefit is taxable?

Up to 50% of it once provisional income passes $25,000 for a single filer or $32,000 for a joint one, and up to 85% above $34,000 and $44,000. Those are caps on the taxable portion, not tax rates.

Do the thresholds rise with the COLA?

No. They have never been indexed to anything. The 50% thresholds were set in 1984 and the 85% thresholds in 1993, and the numbers have not changed since. Benefits have risen with every adjustment in the same period.

Does the COLA push people into taxation?

Mechanically, yes. Half the benefit counts toward provisional income, so a larger benefit raises provisional income against a threshold that does not move. Each adjustment brings a further slice of beneficiaries across a line drawn decades ago.

Sources and freshness

IRS Publication 915 — Social Security and equivalent railroad retirement benefits — verified 10 August 2026
SSA — 2026 COLA fact sheet — verified 10 August 2026

Confirmed against 2 primary sources. These thresholds are statutory and are not indexed.

Figures effective unchanged since 1993. Page figures last verified against the sources above on 10 August 2026. Corrections: the correction log · support@inventum.com.au