Rolling Over Treasury Bills at Maturity

When a Treasury bill reaches its maturity date, the U.S. government repays your principal with interest. Rolling over means reinvesting that money into a new T-bill instead of letting the cash sit idle. At TreasuryDirect, automatic reinvestment is built-in and requires a single choice at purchase; at a brokerage, you manage the rollover actively or set standing instructions with your broker.

What Happens at T-Bill Maturity

When you own a Treasury bill—typically a 4-week, 13-week, or 26-week instrument—the U.S. Treasury repays you the bill’s face value (par) plus the discount you bought it at, which is your accrued interest.

Example: You buy a $10,000 face value 13-week T-bill at a discount of $24.50. You pay $9,975.50 today. In 13 weeks, the Treasury pays you $10,000, netting you a $24.50 gain (or roughly 0.98% annual return on your $9,975.50 invested capital).

The maturity date arrives on a specific weekday announced by the Treasury in advance. On that date, your principal lands in your account (at TreasuryDirect, your linked bank account; at a brokerage, your cash sweep). The bill has now expired and is no longer a security. You must decide: reinvest the proceeds into a new T-bill, move the money elsewhere, or let it sit as cash.

TreasuryDirect Automatic Reinvestment

TreasuryDirect is the Treasury’s direct-to-investor platform. When you purchase a T-bill there, you are offered two choices: have your money reinvested automatically at maturity, or receive a payout.

If you choose automatic reinvestment: At maturity, TreasuryDirect will automatically subscribe on your behalf to a new T-bill of the same term. If you own a 13-week bill that matures on a Thursday, your funds will be reinvested into the next-offered 13-week bill, which typically settles the following Monday (or the next business day after maturity).

The new bill will carry the market rate for that term on the purchase date. You do not get to choose the price or discount; TreasuryDirect executes the reinvestment at the publicly announced terms. If rates have risen, the discount will be larger, and you will receive more of the bill’s face value as interest income. If rates have fallen, the discount will be smaller.

Automatic reinvestment continues until you log into TreasuryDirect and change your election to “maturity payment” or cancel the reinvestment. Many investors set it once and leave it running for years, creating a rolling ladder of T-bills.

If you choose maturity payment: At maturity, the full $10,000 (in the example above) is wired to your linked bank account within one business day. You then decide independently what to do with the cash—buy another T-bill, buy something else, or keep it.

Rolling at a Brokerage

If you hold T-bills through a broker like Fidelity, Schwab, or Vanguard, the process is more hands-on.

When your T-bill matures, the principal is deposited into your cash account (the “sweep” or money-market settlement area). You are not automatically reinvested; you must actively buy a new T-bill. Some brokers offer a “sell instructions” or “rolling interest” feature that allows you to set standing instructions: at maturity, sell the maturing T-bill and automatically submit a buy order for a new one at a specified term.

Actively rolling: After maturity, you log into your brokerage, check the available T-bill offerings (typically in the market screens under “Treasury” or “Fixed Income”), and place a buy order for a new T-bill at your chosen maturity (4-week, 13-week, 26-week, or longer). The new T-bill settles on the next business day.

Broker standing instructions: Many brokers allow you to place a “roll” instruction on a maturing T-bill. You specify: “When this T-bill matures, reinvest the proceeds into a 13-week T-bill at the then-current market price.” The broker executes the trade on the maturity date, and you receive the new bill without manual action.

The advantage of a brokerage is flexibility—you can change maturity terms, hold the proceeds in cash temporarily, or pursue a different strategy. The disadvantage is that you must actively monitor maturities or set standing instructions correctly, or your cash will sit idle and earn little.

Timing and Settlement

When a T-bill matures on a given date, the following events unfold:

1. Treasury payment is processed; your principal + interest is credited.
2. At TreasuryDirect, if you chose automatic reinvestment, the system immediately subscribes to the next available T-bill of the same term.
3. The new T-bill settles typically the next business day (or the Monday after if maturity falls on a Friday).
4. Your new T-bill is issued and begins accruing interest toward the next maturity date.

There is typically no gap—you move from one T-bill to the next seamlessly if you choose automatic reinvestment. If you are managing the rollover manually at a brokerage, you might have a brief window (a day or two) where the cash is not earning T-bill returns; it sits in your sweep account at whatever rate your brokerage offers (typically near fed funds but sometimes lower).

Rate Environment and Rolling Returns

Rolling T-bills exposes you to interest-rate risk—not price risk (because you hold to maturity), but reinvestment risk.

If rates are rising, rolling into new T-bills will earn you higher yields with each successive roll. A ladder of 13-week T-bills purchased when rates are 4% will mature and reinvest at 4.25%, 4.5%, and so on, gradually capturing the higher rates.

If rates are falling, rolling T-bills will lock you into lower yields. A 13-week T-bill purchased at 4% will mature into a new bill at 3.75%, then 3.5%, and so on.

This is why the maturity term matters. A 4-week T-bill rolls every four weeks, exposing you to rate changes very frequently. A 26-week T-bill rolls every six months, buffering you from constant repricing but locking in a rate for a longer period. There is no “right” choice—it depends on your view of rates and your need for flexibility.

Tax Considerations

Interest earned on T-bills is federally taxable in the year it is received—specifically, the year the T-bill matures and the interest is paid to you. This is true whether you roll the proceeds or withdraw them.

T-bill interest is not subject to state or local income tax, which is a significant advantage over corporate bonds or money-market funds.

If you hold T-bills in an IRA or other tax-deferred account, the annual interest taxation does not apply; the entire account grows tax-deferred until you withdraw.

Laddering T-Bills

Many conservative investors roll T-bills into a “ladder” strategy: purchase multiple T-bills at staggered maturities (one matures every week or every month), so that you have predictable cash flow and are reinvesting at frequent intervals. This spreads your rate risk and ensures you are capturing some of the current rate at any given time.

For example: Buy five 13-week T-bills in weeks 1, 2, 3, 4, and 5. One matures every week. Each week, the matured bill’s proceeds are reinvested into a new 13-week bill, using the current market rate. You always own five active T-bills and have constant, predictable liquidity.

When Not to Roll

If rates are expected to fall and you want to lock in a higher yield, you might buy a longer-term Treasury note or bond instead of rolling a T-bill into another short-term bill. Or if you need the cash for spending, you simply choose maturity payment and let the proceeds stay in your account.

If you own T-bills in TreasuryDirect and want to stop automatic reinvestment, log in, navigate to the bill, and select “maturity payment” under your reinvestment election. The change takes effect at the next maturity.

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