Treasury Yields Are Climbing. Her Inflation-Protected Bonds Could Make Social Security Taxable Before She Collects the Cash
She chose inflation-protected Treasury bonds to keep her savings safe, but a quirk in the tax code means the IRS collects on income she cannot spend, and that invisible growth may be quietly pushing more of her Social Security into…
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Picture a retiree who felt she had made the safe choice. She is a hypothetical, but her setup is common. She collects Social Security, and years ago she put $200,000 into individual Treasury Inflation-Protected Securities (TIPS) in an ordinary taxable brokerage account. With Social Security’s 2027 cost-of-living adjustment (COLA) set at 3.6%, inflation is still front and center for retirees. Government bonds that keep up with prices seem like a sensible way to protect her savings.
The catch shows up at tax time. Those bonds create income she never uses. That income can also raise the share of her Social Security check that gets taxed. Many TIPS buyers seeking peace of mind don’t learn about this until a tax preparer points it out.
Her Bonds Grow on Paper, and the IRS Taxes the Growth Now
TIPS protect against inflation by raising their principal as consumer prices rise. Her interest, paid twice a year at a fixed rate, is figured on that larger amount. The extra principal stays inside the bond until it matures or she sells.
The tax code treats that increase as interest anyway. IRS Publication 550, the agency’s guide to investment income, says anyone holding inflation-indexed debt such as TIPS must report any increase in the inflation-adjusted principal as original issue discount. That is the IRS term for interest that builds up inside a bond instead of being paid out. IRS Publication 17, the agency’s general guide for individual filers, says this type of income generally counts as it accrues, whether or not you receive any payments.
So she owes tax on the inflation increase in the year it happens, long before the cash reaches her. Her regular interest payments are taxed separately on top of that. Her broker reports the inflation adjustment in box 8 of Form 1099-OID, which tracks interest that builds up before it’s paid. Regular interest usually appears in box 3 of Form 1099-INT, the tax statement for interest payments.
How $200,000 in TIPS Could Create $7,200 in Taxable Income She Hasn’t Received
Say inflation raises her principal by 3.6% in a year. This is an example. It isn’t a forecast, a guaranteed return or the Treasury’s exact index math. On $200,000 of TIPS, that adds about $7,200 of reportable income.
None of it lands in her checking account. It exists only on her tax return, next to her interest payments, any pension and any IRA withdrawals. It works like getting a raise that your employer deposits into a locked account you can’t open for years, while the IRS taxes it today.
Paper Income Can Make More of Her Social Security Taxable
This is where safe bonds start to cost her. To decide whether Social Security is taxable, the IRS adds one-half of the social security benefits to her other income. Under federal tax law that includes interest that is exempt from tax. Publication 17 goes through the same test.
IRS Publication 915, the agency’s guide to how benefits are taxed, sets the starting threshold for a single filer at $25,000. Once her combined total passes the thresholds, a growing piece of her benefits becomes taxable, up to 85% of them.
That 85% caps the portion of her benefit that is subject to tax. Her actual tax is her own ordinary rate applied to that taxable piece.
Paper TIPS income counts in the test dollar for dollar, the same as cash interest. If she sits just below the threshold, an extra $7,200 of paper income can push part of her benefits into taxable territory. If she is already above it, each added dollar of inflation adjustment can make more of her benefit taxable, so her tax bill grows faster than the adjustment alone would suggest. (This is one of nine IRS rules that quietly drain retirement accounts, all charted in our free tax trap map.)
Where She Holds TIPS Matters as Much as Owning Them
Inside a traditional IRA, the same bonds would play out differently. The annual inflation adjustment goes unreported. She pays tax only when she withdraws, and withdrawals still count in the Social Security test. The difference is control. She decides when to withdraw and how much, at least until required minimum distributions (RMDs) begin at age 73 or 75, depending on when she was born.
Each year, she should check box 8 of her Form 1099-OID before calculating her taxes. She should also keep three things separate in her head: the real yield the bond guaranteed, the inflation adjustment the IRS taxes every year, and the federal tax on her benefits that the adjustment can trigger. Mix them up, and those safe bonds may look cheaper to own than they really are.
If more TIPS still fit her plan, a tax-deferred account is often the cleaner place for new purchases. Taxable dollars can go toward investments whose income she can time. Her filing status, other income and state taxes all change where the threshold hits. The worksheet in IRS Publication 915, which explains how Social Security benefits are taxed, can help her see where she stands before investing more in TIPS.
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