How the Federal-to-State Math Works

On your federal return, Social Security benefits can be up to 85% taxable depending on your “combined income” (AGI plus nontaxable interest plus half your Social Security) per IRC Section 86. If you’re a single filer with combined income over $34,000 or a married couple over $44,000, the IRS taxes up to 85% of your benefits. That taxable amount shows up on Form 1040, line 6b.

New York takes that same line 6b number and subtracts it on IT-201 line 25. All of it. If the IRS said $17,000 of your $20,000 Social Security was taxable, New York subtracts that entire $17,000. Your state taxable income drops by $17,000. At a 6.85% rate, that’s $1,164.50 in state tax you don’t pay.

The beauty of this subtraction is its simplicity. You don’t need to recalculate anything. You don’t need to check income thresholds for New York. You just take the number from your federal return and put it on line 25. Done.

No Income Limits, No Phaseouts

This is what separates New York from states that only partially exempt Social Security. Some states — like Colorado, Connecticut, and Montana — offer a Social Security exemption but phase it out at higher income levels. If you make too much, you lose the benefit.

New York has no such restriction. You could have $500,000 in other income and still subtract every penny of your taxable Social Security. There’s no worksheet to determine eligibility. There’s no sliding scale. The exemption is absolute.

That’s actually a bigger deal than most people realize. High-income retirees who have 85% of their Social Security taxed federally get the full state-level exemption regardless. A couple receiving $60,000 combined in Social Security with 85% taxable federally subtracts $51,000 on line 25. At the 6.85% bracket, that’s $3,493.50 in annual state tax savings — available even if they have $200,000 in other income.

What Qualifies for Line 25

The subtraction covers:

• Social Security retirement benefits — The standard monthly benefit you collect from the SSA
• Social Security disability benefits (SSDI) — Same treatment as retirement benefits for tax purposes
• Social Security survivor benefits — Benefits paid to widows, widowers, and dependents
• Railroad Retirement Tier I benefits — Treated identically to Social Security for both federal and New York purposes

Railroad Retirement Tier I is worth highlighting. If you or your spouse worked for a railroad and receives Tier I benefits, those get the same full exemption on line 25. Tier II benefits, however, are treated differently — they’re more like a private pension and would fall under line 16 and the $20,000 pension exclusion on line 24.

How New York Compares to Other States

New York is one of roughly 40 states (including D.C.) that don’t tax Social Security at the state level. But the comparison gets more interesting when you look at the full retirement picture.

Some states with no income tax at all (Florida, Texas, Nevada) obviously don’t tax Social Security either — but they also don’t have the pension exclusion New York offers. And states like New Jersey exempt Social Security but have lower pension exclusion thresholds. Pennsylvania exempts all retirement income but taxes some types of investment income that New York treats more favorably.

The point: evaluating a state’s retirement tax friendliness requires looking at the whole package. New York’s combination of full Social Security exemption (line 25), $20,000 pension exclusion (line 24), and Treasury interest subtraction (line 23) adds up to a genuinely competitive retirement tax profile — despite the state’s high marginal rates on earned income.

The Combined Effect for Retirees

Stack line 25 with the other retirement subtractions and the numbers get interesting. Consider a married couple, both over 59½:

• Social Security (line 25) — $42,000 in benefits, 85% taxable federally = $35,700 subtracted
• Pension exclusion (line 24) — Husband’s $25,000 pension (capped at $20,000) + wife’s $15,000 IRA (full amount) = $35,000 subtracted
• Treasury interest (line 23) — $3,000 in T-bill interest = $3,000 subtracted

Total New York subtractions: $73,700. At a blended state rate of roughly 6.5%, that’s nearly $4,800 in state tax eliminated. If they’re in NYC, add another $2,800 or so in city tax savings. This couple just saved over $7,600 through three lines on the IT-201.

That’s the kind of math that should make retirees think twice before moving to a “no income tax” state where they’d face higher property taxes, sales taxes, or other costs.

Common Mistakes on Line 25

The most common error isn’t on line 25 itself — it’s forgetting to claim it at all. Some filers, especially those preparing returns manually, skip the subtraction modifications entirely and end up paying New York tax on their Social Security. Tax software generally handles this automatically, but it’s worth double-checking.

Another mistake: confusing the amount to subtract. Line 25 uses the taxable amount from federal line 6b, not the total benefits from line 6a. If you received $24,000 in total benefits but only $20,400 was taxable federally, you subtract $20,400 — not $24,000. The non-taxable portion was never in your income to begin with.

One more: Supplemental Security Income (SSI) doesn’t go here. SSI is a needs-based program, not Social Security. It’s not taxable at any level — federal or state — so there’s nothing to subtract. Only benefits reported on SSA-1099 belong on line 25.

Where This Fits on the IT-201

Line 25 is part of the subtraction modification section (lines 23-28) that adjusts your federal AGI downward to arrive at New York AGI. It works alongside line 23 (Treasury interest) and line 24 (pension exclusion). These three lines together represent the bulk of New York’s retirement income relief. After the subtractions, your New York AGI flows to line 37, where you’ll take either the standard deduction or itemized deductions to arrive at taxable income.

Sources & References

• NY Tax Law Section 612(c)(3) — Social Security Subtraction Modification
• NY IT-201 Instructions — NY Department of Taxation and Finance
• 26 U.S.C. Section 86 — Social Security and Tier 1 Railroad Retirement Benefits
• SSA — Taxes on Social Security Benefits
• IRS Publication 915 — Social Security and Equivalent Railroad Retirement Benefits