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Macro Note 35

Why reopened TIPS can come with accrued interest before the next coupon date

TreasuryDirect says reopened 5-year, 10-year, and 30-year TIPS are generally issued on the last business day of the month but continue to have mid-month maturity dates, and therefore auction buyers must pay interest accrued between the 15th of the month and the issue date. A reopened TIPS keeps the old security's coupon calendar instead of restarting from zero.

By Hynexly Research DeskPublished Feb 8, 2026Updated Feb 8, 20263 min read2 sources

Why this note matters

Investors can assume every new Treasury purchase starts a fresh interest clock on issue date. Treasury's auction timing page shows why reopened TIPS are different: they are tied back to an existing security's schedule.

Key takeaways

  • TreasuryDirect says reopened 5-year, 10-year, and 30-year TIPS are issued near month-end but continue to have mid-month maturity dates.
  • TreasuryDirect says buyers of those reopened TIPS must pay interest accrued between the 15th of the month and the issue date.
  • TreasuryDirect says TIPS pay a fixed rate every six months until maturity, but the payment amount varies because interest is paid on adjusted principal.

A reopened TIPS keeps the old security's schedule

TreasuryDirect's general auction timing page says reopened 5-year, 10-year, and 30-year TIPS are generally issued on the last business day of the month but continue to have a mid-month maturity date. That means the reopened security does not restart its timing conventions from the new issue date.

Instead, the reopening is slotted back into the schedule of the existing TIPS line that is being reopened.

That inherited schedule is why accrued interest can appear immediately

TreasuryDirect says that because these reopened TIPS continue to have a mid-month maturity date, investors who purchase them at auction must pay interest accrued between the 15th of the month and the issue date. Its TIPS page also explains that TIPS pay a fixed rate every six months until maturity, with the payment amount varying because it is based on adjusted principal.

So the accrued-interest step is not a strange extra fee. It follows from buying into a security that is already partway through an established coupon period.

  • Reopened TIPS inherit the existing security's calendar.
  • Month-end issue does not mean the coupon clock started at month-end.
  • Accrued interest reflects entry into an already running interest period.

Why Hynexly readers should care

Auction settlement details can look surprising when the investor assumes every purchase starts a fresh interest cycle. TreasuryDirect's own timing guidance shows why reopened TIPS do not always behave that way.

For Hynexly readers, the practical rule is simple: when a TIPS is a reopening, check the inherited security calendar before treating settlement cash flows as if they belonged to a brand-new issue.

Source evidence snapshot

General Auction Timing

TreasuryDirect explains that reopened TIPS keep mid-month maturity dates and therefore require accrued interest to be paid between the 15th and the issue date.

Open source

Treasury Inflation-Protected Securities (TIPS)

TreasuryDirect explains that TIPS pay a fixed rate of interest every six months and that the payment amount varies because it is based on adjusted principal.

Open source

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