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CP2000 for Social Security benefits (SSA-1099)

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CP2000 for Social Security benefits (SSA-1099)

By Tax Letter Desk Updated November 4, 2026

Short answer

Part of your Social Security may be taxable, depending on your other income.

A CP2000 compares forms like your SSA-1099 with your return.

Check box 5 and the taxable part before you agree.

Checked November 4, 2026 against IRS Topic 423 (Oct 7, 2026) , IRS Pub 915 (2025) , IRS Topic 652 (Oct 16, 2026) .

In this article

When are benefits taxable?

How much can be taxable?

What should I check on the notice?

How do I reply?

Questions

When are benefits taxable?

Add half your benefits to all your other income, including tax-exempt interest.

Compare that total with the base amount for your filing status.

How much can be taxable?

Generally up to 50% of your benefits. Up to 85% can be taxable in some cases.

Agree with every change: $49. See first if that fits, free.

What should I check on the notice?

The benefits amount, against box 5 of your SSA-1099.

Your spouse’s income, if you file jointly.

Lump-sum payments for prior years, which have a special election.

How do I reply?

If the change is right, sign the Response form and return it. Both spouses sign a joint return.

If not, mark the disagree box and explain, with your worksheet and documents.

Sources

Topic no. 423, Social Security and equivalent Railroad Retirement benefits IRS, updated October 7, 2026

Publication 915, Social Security and equivalent railroad retirement benefits (PDF) IRS, 2025 edition

Topic no. 652, Notice of underreported income, CP2000 IRS, updated October 16, 2026

Questions

Box 5 of Form SSA-1099.

No. It’s $25,000, $32,000 or $0, depending on filing status.

Pub 915 describes a special election that may reduce the taxable amount.

Related guides

How to respond to a CP2000 notice Pillar guide

CP2000 for a 1099-R or rollover Article

Agree with a CP2000: what to send and pay Article

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Tax Letter Desk is a private service, not affiliated with the IRS or any government agency.

You can respond to the IRS yourself, for free. Not a substitute for the advice of an attorney.