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Yes, Social Security benefits can be subject to federal income tax, but having $1.2 million saved does not by itself determine how much of a couple’s benefits is taxable. The IRS calculation depends on their filing status, benefits, and income—including interest, dividends, gains, pensions, and some retirement-account withdrawals. The ages and savings total alone are not enough to work out their tax bill.
Why can Social Security benefits be taxable?
The IRS compares a measure called combined income with a base amount for the taxpayer’s filing status. In general, combined income is one-half of Social Security benefits plus other income, including tax-exempt interest. The IRS explains the test in Publication 915.
For tax year 2025, the base amount is $32,000 for married people filing jointly and $25,000 for single filers and certain other filing statuses. Above the applicable base amount, some benefits may be taxable. When combined income exceeds $44,000 for joint filers or $34,000 for single filers, up to 85% of benefits may be included in taxable income.
That 85% is not an 85% tax rate. It is the maximum share of benefits that may be included in taxable income; the taxable amount is then handled under the taxpayer’s regular income-tax calculation. These are federal rules for 2025, not a statement about how any state treats Social Security.
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Does $1.2 million in savings make benefits taxable?
No. The principal balance of savings is not itself an input in the Social Security benefits calculation. What matters is income and distributions associated with the couple’s assets. Taxable interest, dividends, capital gains, pensions, and taxable withdrawals from tax-deferred accounts can affect combined income. Tax-exempt municipal-bond interest also counts in this calculation.
That means two couples with the same savings balance could have different taxable-benefit results if their investments, income, withdrawals, or Social Security benefits differ. The couple’s $1.2 million total does not reveal those details.
How much of a couple’s Social Security is taxable?
For a joint return, spouses combine their income and Social Security benefits for this calculation, even if only one spouse receives benefits, according to the IRS Social Security Income FAQ. The exact taxable portion depends on the couple’s figures and may require the worksheet in the applicable tax-year instructions.
The IRS quick check is to add one-half of Social Security benefits to other income, including tax-exempt interest, then compare the result with the applicable base amount. The calculation is not simply a tax on the savings balance or on benefits considered in isolation.
Do ages 68 and 66 explain the tax bill?
No. Age alone does not determine whether Social Security benefits are taxable. Nor do these ages establish that either spouse must take required minimum distributions. The IRS says the general RMD starting age is 73 for many retirement accounts, subject to account-specific rules and exceptions. Taxable withdrawals can still matter if the couple chooses to take them before then, and other income sources can affect the calculation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to check the couple’s own situation
- Identify the tax year and filing status. The thresholds above apply to tax year 2025. Use the rules and forms for the year being filed, and determine whether the return is joint or uses another filing status.
- Gather both spouses’ records. Collect each Form SSA-1099, along with records of taxable income, tax-exempt interest, pensions, and IRA or retirement-plan distributions. The SSA-1099 reports benefit information.
- Use the IRS calculation. Consult Publication 915 and the Social Security Benefits Worksheet in the Form 1040 instructions. The IRS Interactive Tax Assistant can also help determine whether benefits may be taxable. Certain circumstances, including some IRA contributions and exclusions, may require a different worksheet.
- Check how the result appears on the return. On Form 1040, total Social Security benefits go on line 6a and the taxable portion on line 6b, as described in the IRS FAQ.
Tax software or a tax professional may be useful if the return includes multiple accounts, unusual exclusions, or state filings. The right choice depends on the return’s complexity; neither the savings total nor the surprise about taxation is enough to identify a particular product or service as necessary.
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