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Compute the taxable portion of Social Security benefits and foreign pensions
Two kinds of retirement income arrive from outside any employer plan: monthly Social Security checks and pensions earned abroad. Social Security is taxed through a two-stage test: first ask whether any of it can be taxed, then compute how much, including the lump-sum election for retroactive payments and the netting of repayments. Foreign pensions start from worldwide taxation and narrow through each treaty's terms. This lesson teaches the base-amount test with its filing-status base amounts, the 50% and 85% computation layers with their return lines, and the treaty-first handling of foreign pensions.
The test asks one question: does this household's money rise above its filing-status base amount? Add one-half of benefits from box 5 of Form SSA-1099 and Form RRB-1099 to all other income, including tax-exempt interest. Do not reduce other income by exclusions for qualified U.S. savings bond interest, employer-provided adoption benefits, education-loan interest, foreign earned income or foreign housing, or income earned by bona fide residents of American Samoa or Puerto Rico. Only the social security equivalent benefit (SSEB) portion of tier 1 railroad benefits counts in this test. Figure benefits from net box-5 amounts: gross benefits are shown in box 3, repayments in box 4, and box 5 (box 3 minus box 4) controls the test. When that total stays at or below the base amount, none of the benefits are taxable for the year. Exceeding the base amount does not tax anything by itself; it routes the return to Worksheet 1 for the actual computation. Joint filers combine both spouses' incomes and benefits for the test.
| Filing status | Base amount |
|---|---|
| Single, head of household, qualifying surviving spouse | $25,000 |
| Married filing separately, lived apart from spouse all year | $25,000 |
| Married filing jointly | $32,000 |
| Married filing separately, lived together at any time | $0 |
If you are married filing separately and you lived apart from your spouse for all of 2025, check the box on line 6d of Form 1040.
Rita, single, holds $10,000 of benefits, a $20,000 pension, and $1,000 of tax-exempt interest. Her test total is \(10{,}000 \times 50\%\) plus $21,000 of other income, equal to $26,000. Her base amount as a single filer is $25,000, so $26,000 exceeds it: some of her benefits may be taxable and she completes Worksheet 1. Had her total been $25,000 or less, none of her benefits would be taxable and no worksheet would be needed.
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compare the base amount (explained later) for your filing status with the total of: 1. One-half of your benefits; plus 2. All your other income, including tax-exempt interest.View on the source
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If the amount on line E equals or is less than the base amount for your filing status, none of your benefits are taxable this year.View on the source
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Your base amount is: • $25,000 if you are single, head of household, or qualifying surviving spouse; • $25,000 if you are married filing separately and lived apart from your spouse for all of 2025; • $32,000 if you are married filing jointly; or • $0 if you are married filing separately and lived with your spouse at any time during 2025.View on the source
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If you are married and file a joint return for 2025, you and your spouse must combine your incomes and your benefits to figure whether any of your combined benefits are taxable.View on the source
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Equivalent tier 1 railroad retirement benefits are the part of tier 1 benefits that a railroad employee or beneficiary would have been entitled to receive under the social security system. They are commonly called the social security equivalent benefit (SSEB) portion of tier 1 benefits.View on the source
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When making this comparison, don’t reduce your other income by any exclusions for: • Interest from qualified U.S. savings bonds, • Employer-provided adoption benefits, • Interest on education loans, • Foreign earned income or foreign housing, or • Income earned by bona fide residents of American Samoa or Puerto Rico.View on the source
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If you are married filing separately and you lived apart from your spouse for all of 2025, check the box on line 6d.View on the source
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Your gross benefits are shown in box 3 of Form SSA-1099 or RRB-1099. Your repayments are shown in box 4. The amount in box 5 shows your net benefits for 2025 (box 3 minus box 4). Use the amount in box 5 to figure whether any of your benefits are taxable.View on the source
A single filer received 2025 net Social Security benefits of $10,000 in box 5 of Form SSA-1099, wages of $18,000, and $2,000 of tax-exempt municipal-bond interest. Which statement correctly applies the base-amount test?
Worksheet 1 converts the test total into taxable income through two layers. First take half of the smaller of (a) the excess over the base amount and (b) the $9,000 band between the two thresholds ($12,000 joint), but no more than half of benefits; this layer therefore never exceeds $4,500 ($6,000 joint). Then add 85% of any excess over the $34,000 second threshold ($44,000 joint) and cap the sum at 85% of benefits. Generally up to half the benefits can be taxable. The higher layer reaches up to 85% when the combined total passes $34,000 ($44,000 joint) or when a married-separately filer lived with the spouse during the year. The return keeps gross and taxable apart: net box-5 benefits on line 6a of Form 1040, the taxable share on line 6b.
| Situation | Maximum taxable share |
|---|---|
| Below the higher trigger | Up to 50% |
| Above $34,000 ($44,000 joint), or MFS living together | Up to 85% |
A lump-sum (retroactive) payment for an earlier year is included in 2025 income, with an optional election that can lower the taxable amount: refigure the earlier year's taxable benefits using that year's income, subtract what was previously reported, and add the remainder to 2025's taxable benefits figured without the earlier-year lump sum. The election routes through Worksheet 2 (lump sum for a year after 1993) or Worksheet 3 (for 1993 or an earlier year), then Worksheet 4, and is claimed by checking the box on line 6c; no amended return is filed for the earlier year.
When box 5 across all Forms SSA-1099 and RRB-1099 is a negative figure, none of the benefits are taxable and Worksheet 1 is not used. If that negative figure is more than $3,000, figure the 2025 tax two ways — the itemized-deduction route and the credit route under I.R.C. 1341 — and take the smaller tax; a figure of $3,000 or less is a miscellaneous itemized deduction that can no longer be deducted.
Jamie and Jessie file jointly with $10,000 of SSEB benefits in box 5 and $40,500 of other income. Half of benefits ($5,000) plus $40,500 is a $45,500 test total, which exceeds both the $32,000 joint base amount and the $44,000 second threshold. Worksheet 1 takes the 50% layer first: the $13,500 excess over $32,000 is limited to the $12,000 band, half of which is $6,000, but half of benefits is only $5,000, so the layer is $5,000. It then adds 85% of the $1,500 excess over $44,000 ($1,275), for $6,275 of taxable benefits, under the $8,500 cap (85% of benefits). They report $10,000 on line 6a and $6,275 on line 6b. Where the band binds instead: a single filer with $12,000 of benefits and a $38,000 test total has a $13,000 excess over $25,000, but only $9,000 counts, so the first layer is $4,500 (less than half of benefits, $6,000); 85% of the $4,000 above $34,000 adds $3,400, for $7,900 of taxable benefits, under the $10,200 cap.
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Generally, up to 50% of your benefits will be taxable. However, up to 85% of your benefits can be taxable if either of the following situations applies to you.View on the source
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However, up to 85% of your benefits can be taxable if either of the following situations applies to you. • The total of one-half of your benefits and all your other income is more than $34,000 ($44,000 if you are married filing jointly). • You are married filing separately and lived with your spouse at any time during 2025.View on the source
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Enter the smaller of line 2 or line 14View on the source
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Multiply line 12 by 85% (0.85). If line 12 is zero, enter -0-View on the source
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More than 50% of Jamie’s net benefits are taxable because the income on line 8 of the worksheet ($45,500) is more than $44,000.View on the source
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Report your net benefits (the total amount from box 5 of all your Forms SSA-1099 and RRB-1099) on line 6a and the taxable part on line 6b.View on the source
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You must include the taxable part of a lump-sum (retroactive) payment of benefits received in 2025 in your 2025 income, even if the payment includes benefits for an earlier year.View on the source
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Under the lump-sum election method, you refigure the taxable part of all your benefits for the earlier year (including the lump-sum payment) using that year’s income. Then, you subtract any taxable benefits for that year that you previously reported. The remainder is the taxable part of the lump-sum payment. Add it to the taxable part of your benefits for 2025 (figured without the lump-sum payment for the earlier year).View on the source
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You can elect this method if it lowers your taxable benefits.View on the source
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Use Worksheet 2 if your lump-sum payment was for a year after 1993. Use Worksheet 3 if it was for 1993 or an earlier year.View on the source
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Check the box on Form 1040 or 1040-SR, line 6c, if you elect to use the lump-sum election method for your benefits.View on the source
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Caution: Because the earlier year’s taxable benefits are included in your 2025 income, no adjustment is made to the earlier year’s return. Don’t file an amended return for the earlier year.View on the source
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If this occurred, your net benefits in box 5 will be a negative figure (a figure in parentheses) and none of your benefits will be taxable. Don’t use Worksheet 1 in this case.View on the source
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If the total amount shown in box 5 of all of your Forms SSA-1099 and RRB-1099 is a negative figure, you may be able to deduct part of this negative figure that represents benefits you included in gross income in an earlier year, if the figure is more than $3,000. If the figure is $3,000 or less, it is a miscellaneous itemized deduction and can no longer be deducted.View on the source
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Compare the tax figured in methods 1 and 2. Your tax for 2025 is the smaller of the two amounts. If method 1 results in less tax, take the itemized deduction on Schedule A (Form 1040), line 16.View on the source
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If method 2 results in less tax, claim a credit for the amount from step 2c above on Schedule 3 (Form 1040), line 13z. Enter “I.R.C. 1341” on the entry line.View on the source
A single filer has $10,000 of net benefits in box 5 and other income that puts one-half of benefits plus all other income at $38,000. What is the maximum taxable part of the benefits?
A foreign pension starts taxable because United States citizens and residents face United States tax on worldwide income, and narrows only through its specific treaty, tested per treaty rather than assumed. A treaty-based position that reduces United States tax is generally disclosed on Form 8833 attached to the return. Canadian or German social security benefits paid to United States residents are treated as if paid under United States legislation, with a place on line 1 of Worksheet 1. Government pensions follow the same treaty-first test: pensions paid by Germany for government services are exempt unless the recipient is both a resident and a national of the United States, and pensions paid by Japan for government services are exempt unless the recipient is a resident and a citizen of the United States, so a United States citizen living in the United States stays taxable on those pensions and counts them as other income. Without a treaty exemption, the private foreign pension stays in income; foreign income tax on that foreign-source income may be taken as a credit or an itemized deduction under the foreign tax credit rules taught in "Earning Abroad", rather than as an exclusion. On payment mechanics, United States payers of the listed deferred-compensation, retirement-plan, and annuity benefits generally withhold from payments delivered outside the United States; the recipient can choose exemption by giving the payer a United States or territory residence address.
Henrik, a United States resident, draws a private foreign pension with no treaty exemption. The pension stays in his income under worldwide taxation, and his foreign tax is a credit-or-deduction question under the "Earning Abroad" foreign tax credit rules, not an exclusion. Peggy, also resident, draws Canadian social security instead: her benefits go on line 1 of Worksheet 1 as if paid under United States legislation, with any treaty exemption tested rather than assumed.
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U.S. citizens and residents are subject to U.S. income tax on their worldwide income.View on the source
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If you take the position that any U.S. tax is overruled or otherwise reduced by a U.S. treaty (a treaty-based position), you must generally disclose that position on Form 8833 and attach it to your return.View on the source
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Under income tax treaties with Canada and Germany, social security benefits paid by those countries to U.S. residents are treated for U.S. income tax purposes as if they were paid under the social security legislation of the United States. If you receive social security benefits from Canada or Germany, include them on line 1 of Worksheet 1.View on the source
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Pensions paid by, or out of funds created by, Germany or its political subdivisions, local authorities, or instrumentalities for services performed for the paying governmental body are exempt from U.S. income tax unless the recipient is both a resident and a national of the United States.View on the source
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Pensions paid by, or out of funds to which contributions are made by, Japan or its political subdivisions or local authorities for services performed for Japan are exempt from U.S. income tax unless the recipient is a resident and a citizen of the United States.View on the source
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If you paid or accrued income taxes to a foreign country on foreign source income and are subject to U.S. tax on your foreign source income, you may be able to take either a credit or an itemized deduction for those taxes.View on the source
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U.S. payers of benefits from employer-deferred compensation plans, individual retirement plans, and commercial annuities must generally withhold income tax from payments delivered outside of the United States.View on the source
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You can choose exemption from withholding if you: • Provide the payer of the benefits with a residence address in the United States or a U.S. territory, orView on the source
A U.S. resident received social security benefits from Germany plus U.S. wages. Which treaty treatment is correct before figuring taxable benefits?
The course asks you questions like these as you learn, brings back the ones you miss, and ends with full-length practice exams.
See the course Or take the free 12-question checkGroundSkill is independently produced and is not affiliated with or endorsed by the IRS. Sources last checked 2026-09-14. Exam preparation, not tax advice.