What the result means
The result estimates the portion of expected Social Security and equivalent Tier 1 railroad retirement benefits included in 2026 income under the general annual worksheet. It reports the estimated taxable amount, the remaining nontaxable amount, and the worksheet values that caused benefits to enter income.
The result is not the tax owed on Social Security. Taxable benefits are combined with other applicable income and deductions before federal income tax is calculated. A person with $10,000 of taxable benefits does not owe $10,000 of tax and does not automatically owe 85% of that amount.
Use the benefits amount—not the bank deposit
The IRS states that net Social Security benefits are generally shown in box 5 of Form SSA-1099 and reported on Form 1040 or 1040-SR line 6a. Medicare premiums withheld from a benefit can make the deposited cash lower than the benefit amount used for tax reporting. For a projection, use the expected amount comparable to box 5 rather than adding monthly bank deposits.
On a joint return, combine both spouses’ expected Social Security and equivalent Tier 1 benefits. The same joint-return treatment applies to the other income, tax-exempt interest, exclusions, and adjustments entered in the worksheet.
Supplemental Security Income is different
Supplemental Security Income, commonly called SSI, is not Social Security retirement, survivor, or disability insurance. The IRS explains that SSI payments are not taxable and should not be entered as Social Security benefits in this calculation.
Railroad retirement reporting also needs care. Only the equivalent Tier 1 amount treated like Social Security belongs in this worksheet. Other railroad retirement benefits can follow pension rules instead.
The first comparison uses half of benefits
Publication 505 Worksheet 2-2 starts with expected benefits and calculates one-half. It then adds other expected total income, expected nontaxable interest, and specified exclusions or deductions. Applicable adjustments to income—excluding student-loan interest for this worksheet—are subtracted.
The resulting worksheet amount is often described informally as combined income or provisional income. It is a comparison figure, not necessarily the adjusted gross income that will appear on the return.
Filing status sets the first base amount
The first base amount is $25,000 for single, head-of-household, and qualifying-surviving-spouse filers. It is also $25,000 for married filing separately when the spouses lived apart for the entire year. The joint base amount is $32,000.
For married filing separately when the spouses lived together at any time during the year, the worksheet base is $0. This path can cause benefits to enter the 85% calculation much earlier. The living-arrangement question therefore cannot be inferred from the filing-status label alone.
The worksheet then applies a 50% zone
For the $25,000 filing group, the worksheet’s next range is $9,000. For married filing jointly, it is $12,000. This corresponds to the familiar $34,000 and $44,000 comparison points, but the official worksheet uses the base amount and range as separate lines.
Up to one-half of the amount in this first zone can enter the taxable-benefit calculation, limited by one-half of total benefits. Amounts above the zone move into the 85% portion of the formula.
The final taxable amount is capped at 85% of benefits
The worksheet adds the limited 50% component to 85% of the amount above the second comparison point. It then compares that result with 85% of total benefits and uses the smaller amount.
This 85% limit means no more than 85% of covered benefits is included in income under the general worksheet. It does not mean the benefits are taxed at an 85% federal rate. The applicable tax rate depends on the complete return.
Other income must exclude the items listed separately
The other-income field follows Publication 505 line 3. Do not include Social Security or equivalent Tier 1 benefits again. Do not include nontaxable interest because it has its own field. Do not include nontaxable IRA or pension distributions.
Taxable wages, pension income, IRA distributions, interest, dividends, capital gains, business income, rental income, unemployment compensation, and other return items can be part of the broader total-income projection when applicable. Use the expected joint totals for a joint return.
Tax-exempt interest still affects this worksheet
Municipal-bond interest may be excluded from ordinary federal taxable income while still increasing the Social Security benefit comparison. That is why the form asks for nontaxable interest separately instead of assuming tax-exempt means irrelevant.
Do not add tax-exempt interest to both the other-income and nontaxable-interest fields. Duplicate entry would overstate the worksheet amount and potentially the estimated taxable benefits.
Some exclusions are added back
Worksheet 2-2 adds specified exclusions and deductions as positive amounts. The list includes qualifying U.S. savings-bond interest used for higher education, employer-provided adoption benefits, foreign earned income or housing amounts, and specified income for bona fide residents of American Samoa or Puerto Rico.
Most users will choose no listed exclusions. The input remains hidden until it is relevant so a rare rule does not distract from the ordinary path.
Adjustments can reduce the comparison amount
The worksheet subtracts expected adjustments to income but instructs users not to include a student-loan-interest deduction on that line. Determine the correct adjustment total from the current projected return rather than subtracting every deduction or the standard deduction.
Itemized deductions and the standard deduction do not belong in this adjustment field. They generally affect taxable income later, after adjusted gross income is determined.
Special cases require another worksheet
Do not use the general result as a filing number when a lump-sum election for prior-year benefits may apply, repayments exceed gross benefits, nonresident rules apply, or a Traditional IRA deduction creates a circular interaction covered by Publication 590-A. The final 2026 Form 1040 instructions and Publication 915 can also identify exceptions not represented in an annual estimated-tax worksheet.
Benefit repayments, attorney fees, workers’ compensation offsets, railroad reporting, and prior-year lump sums can require source documents and case-specific instructions. Choose the special path when the correct benefit amount or worksheet is uncertain.
Carry the result into the broader tax projection
The estimated taxable amount can be included in projected adjusted gross income for the 2026 Federal Income Tax Bracket Calculator only after all other income and adjustments have been assembled. Qualified dividends and long-term capital gains may require the separate preferential-rate worksheet.
If the resulting total-tax projection shows insufficient withholding, the 2026 Quarterly Estimated Tax Calculator can compare the general safe-harbor targets and payment checkpoints. Do not treat taxable benefits alone as the quarterly payment.
Voluntary withholding is a separate decision
Federal income tax can be voluntarily withheld from Social Security benefits using the applicable current process, including Form W-4V where appropriate. Withholding reduces cash received and counts as a payment toward tax; it does not change how much of the benefit is included in income under this worksheet.
Compare projected total tax with withholding from all sources before changing an election. Confirm later statements because a requested percentage and the actual annual amount can differ when benefits change during the year.
Taxable benefits and Medicare IRMAA are not the same test
Social Security benefit inclusion uses the worksheet described on this page. Medicare IRMAA uses modified adjusted gross income from a specified prior-year tax return and filing-status brackets. The two calculations have different years, inputs, thresholds, and consequences.
Use the 2026 Medicare IRMAA Calculator only with the tax year and notice facts it requests. Do not substitute the combined-income amount from this Social Security worksheet for IRMAA MAGI.
Verify the filing-year instructions
This calculator follows IRS Publication 505 (2026), Worksheet 2-2, which is intended for 2026 withholding and estimated-tax projections. When preparing the 2026 return, use the final 2026 Form 1040 instructions and Publication 915 available for that filing season.
The IRS Social Security income FAQ explains the benefit types, SSA-1099 reporting, filing-status base amounts, joint-return combination, and general taxability question. Notice 703 provides a quick screening worksheet but does not replace the full taxable-benefit calculation.
This calculator provides educational 2026 federal general-worksheet arithmetic, not tax preparation, tax, legal, Social Security, railroad retirement, Medicare, benefits, investment, or financial advice. It does not determine benefit type, filing status, income classification, adjustments, exclusions, IRA deductions, lump-sum elections, repayment treatment, withholding, estimated payments, state tax, a refund, or the final return entry. Verify all amounts with current SSA, RRB, and IRS statements, forms, instructions, software, and qualified guidance. Official sources were accessed July 27, 2026.