Treasury Bills for Business Cash Reserves (2026)

Treasury bills for business cash reserves are a low-risk way to earn market interest on money you will not need for a few weeks to a year, such as an emergency fund, quarterly tax money or cash raised for a planned purchase. T-bills are short-term US government debt sold at a discount in $100 increments, maturing in 4 to 52 weeks. In late October 2026, Treasury's daily rates showed yields of roughly 4% to 4.4% depending on term, the interest is exempt from state and local income tax, and there is no $250,000 FDIC limit to manage.

This guide explains how T-bills work, how a business can buy them, how they compare with savings and money market options, how to ladder maturities to match your cash needs, and the mistakes to avoid. It is general information, not investment or tax advice.

How Treasury bills work

According to TreasuryDirect's Treasury bills page, bills are sold at a discount or at face value, with the rate set at auction, and mature in 4, 6, 8, 13, 17, 26 or 52 weeks. You pay less than face value and receive the full face value at maturity; the difference is your interest. The minimum purchase is $100, in $100 increments, and a noncompetitive bid can buy up to $10 million of a bill per auction. Interest is subject to federal income tax but not state or local income tax.

Current Treasury bill yields

Rates move every day. The figures below are the coupon-equivalent rates published in Treasury's daily Treasury bill rates for October 30, 2026:

Term	Coupon-equivalent yield (Oct 30, 2026)	Good for
4 weeks	3.98%	Next month's tax payment or payroll buffer
8 weeks	4.08%	Upcoming quarterly estimated tax
13 weeks	4.08%	Quarterly ladder rung
26 weeks	4.25%	Emergency fund core
52 weeks	4.36%	Planned purchase a year out

Check the latest rates before buying; future auctions can price higher or lower.

How a business can buy Treasury bills

Method	Pros	Cons
TreasuryDirect entity account	No fees; buy directly at auction; auto-reinvest option	Dated interface; selling before maturity requires transferring out; setup paperwork for entities
Business brokerage account	Buy at auction or on secondary market; sell anytime; cash sweeps	Some brokers charge fees or have minimums
Fintech treasury product	Inside your business banking app	Often a fund rather than direct bills; advisory fees; not FDIC insured
Treasury money market fund or T-bill ETF	Daily liquidity, no maturities to manage	Fund expense ratio; value can fluctuate slightly

TreasuryDirect permits entity accounts for corporations, partnerships, trusts and estates, with securities registered in the entity's name, as its user guide describes. Whichever route you pick, open the account in the business's legal name with its EIN, not your personal Social Security number, so interest and records stay with the business.

Treasury bills for business vs other places to park cash

Option	Yield	Liquidity	Protection	State tax on interest
Business checking	Usually low or none	Instant	FDIC up to $250,000 per category	Taxable
High-yield business savings	Variable	1 to 2 days	FDIC	Taxable
Certificate of deposit	Fixed	Penalty to withdraw early	FDIC	Taxable
Treasury bills	Market rate	At maturity, or sell via broker	US government backing	Exempt
Treasury money market fund	Close to bill rates, minus fees	Daily	Not FDIC; holds government securities	Often largely exempt; check fund

The state tax exemption matters most in high-tax states. A 4.1% T-bill can beat a slightly higher-yielding savings account once state tax is counted.

Laddering T-bills to match your cash needs (step by step)

1. Keep operating cash in checking. Hold at least one to two months of expenses in your bank account; bills are for reserves only.
2. List known outflows: quarterly estimated taxes, annual insurance, equipment purchases, year-end bonuses.
3. Size your emergency reserve; our guide to a business emergency fund suggests how many months to target.
4. Match maturities to dates. Buy a bill that matures a few days before each known payment.
5. Split the emergency reserve into rungs, for example one-third each in 4-, 13- and 26-week bills.
6. Reinvest or redirect at maturity, based on your updated cash flow forecast.
7. Record each purchase and maturity in your books so interest is reported correctly.

Worked example: a consultancy's reserves

Illustrative figures using the October 30, 2026 rates. A consulting firm has $120,000 in the bank. Monthly expenses are $25,000; it keeps $50,000 in checking and invests $70,000.

Purpose	Amount	Bill term	Approx. yield	Approx. interest to maturity
Q4 estimated tax (due January 15)	$20,000	8 weeks	4.08%	About $125
Emergency rung 1	$15,000	13 weeks	4.08%	About $150
Emergency rung 2	$15,000	26 weeks	4.25%	About $315
Equipment purchase next fall	$20,000	52 weeks	4.36%	About $870

The interest is modest, but over a year this structure can earn a few thousand dollars on money that would otherwise sit idle, without state income tax on it. Compare that to the cost of a missed tax payment or an emergency loan, and the planning pays for itself.

Risks and common mistakes

• Investing operating cash. If clients pay late, you may need to sell early or borrow. Keep a buffer for slow-paying invoices.
• Mismatched maturities. A bill maturing the day after a tax deadline does not help.
• Forgetting settlement timing. Auction purchases settle on the issue date, and TreasuryDirect proceeds take time to reach your bank.
• Using a personal account for business cash, which blurs records and tax reporting.
• Chasing small yield differences while ignoring fees in fintech or fund products.
• Treating funds as FDIC deposits. Treasury funds and investment sweeps are not bank deposits.

What to do if you need the cash early

If the bills are in a brokerage account, you can sell them on the secondary market, usually within a day; the price will reflect current rates, so you might receive slightly more or less than your purchase price plus accrued interest. Bills held in TreasuryDirect cannot be sold there directly; they must be transferred to a broker first, which takes time. That is why many businesses keep near-term needs in savings or a business savings account and use TreasuryDirect only for money with fixed future dates. For short-term gaps, a business line of credit can be cheaper than selling at a bad moment.

Buying your first Treasury bill: step by step

1. Choose the account. A business brokerage account is simplest if you might need to sell early; TreasuryDirect suits money you will hold to maturity.
2. Open it in the business name with the EIN, an authorized signer and a linked business bank account.
3. Fund the account by ACH from your business checking.
4. Pick the term that matures just before you need the money.
5. Place a noncompetitive bid at the next auction, or buy an existing bill on the secondary market through a broker.
6. Decide on reinvestment. Auto-roll if the money is a long-term reserve; let it mature to cash if it is earmarked for a payment.
7. Save the confirmation showing purchase price, face value, issue and maturity dates.

Recording Treasury bills in your books

A simple approach for a small business: when you buy, move the purchase price from cash to a short-term investments account. At maturity, record cash received at face value, reduce short-term investments by the purchase price, and record the difference as interest income. For example, a $10,000 26-week bill bought for $9,795 produces $205 of interest income at maturity. Your accountant may prefer to accrue interest month by month for larger holdings; our guide to journal entries covers the basics.

How much of your cash should go into T-bills?

There is no single right number, but a practical rule is to keep enough in checking to cover one to two months of expenses plus any invoices that clients often pay late, keep a smaller instant-access buffer in savings, and use T-bills only for money with a known future date or for the core of your emergency reserve. If your cash flow swings widely from month to month, keep more in instant-access accounts and fewer, shorter bills.

Who should not use Treasury bills

If your business has less than a month or two of expenses in the bank, T-bills are not the priority; build a basic cash buffer in an insured savings account first. Businesses with very small balances may also find the setup and record-keeping not worth a few dollars of extra interest. T-bills make the most sense once you have a stable cash cushion and identifiable sums you will not touch for at least several weeks.

If you are unsure, start with one small bill timed to your next quarterly tax payment and see how the process fits your routine before committing more of your reserves.

How reserves connect to invoicing

Reserves exist because income is uneven. The more predictable your invoicing and collections, the more of your cash you can safely put to work. Send invoices promptly, use clear payment terms, and track what is outstanding so your working capital stays healthy. You can create and download professional invoices as PDFs with our free invoice generator, with no sign-up required, so cash arrives on time and your reserves can keep earning.