Are Treasury bills better than a high-yield savings account?

It depends on your state. T-bill interest is exempt from state and local taxes, which gives them a meaningful edge in high-tax states. A 5.00% T-bill in California (13.3% state tax) is equivalent to about 5.77% on a HYSA. In no-tax states like Texas or Florida, compare on rate alone — HYSAs are often more convenient.

Are Treasury bills safer than a savings account?

Both are extremely safe. Treasury bills are backed by the full faith and credit of the US government with no dollar limit. FDIC-insured savings accounts are protected up to $250,000 per depositor per bank, also backed by the US government. For under $250,000, safety is effectively identical.

Can I lose money on Treasury bills?

If you hold T-bills to maturity, you cannot lose money — you receive the full face value. If you sell before maturity on the secondary market, the price may be slightly above or below what you paid depending on current rates. HYSAs never lose value regardless of when you withdraw.

HYSA vs Treasury Bills: Which Is Better for Your Cash? (2026)

High-yield savings accounts are the easiest place to earn 4%+ on cash. Treasury bills can earn even more after state taxes. The right choice depends on where you live, how much you have, and how much effort you’re willing to invest.

HYSA vs Treasury Bills: Quick Comparison

Feature	High-Yield Savings (HYSA)	Treasury Bills (T-Bills)
Best rates (2026)	4.50-4.75% APY	4.75-5.25%
State/local tax	Taxable	Exempt
Federal tax	Taxable	Taxable
Safety	FDIC insured ($250,000)	Full faith & credit of US govt (no limit)
Liquidity	Withdraw anytime	Sell early on secondary market (price may vary)
Minimum	$0-$1	$100
Terms	None (open-ended)	4, 8, 13, 17, 26, 52 weeks
How to buy	Open account at bank	TreasuryDirect.gov or brokerage
Compounding	Daily, paid monthly	None (sold at discount to face value)
Automatic deposits	✅	❌ (must buy new bills each time)
FDIC insured	Yes	No (backed directly by US govt)
Complexity	Very simple	Moderate

Rate Comparison (March 2026)

HYSA vs T-Bill Nominal Rates

Term/Product	HYSA (Best)	T-Bill Rate	Difference
On-demand / 4-week	4.50-4.75%	4.75%	T-bill +0.00-0.25%
— / 8-week	4.50-4.75%	4.85%	T-bill +0.10-0.35%
— / 13-week (3-month)	4.50-4.75%	5.00%	T-bill +0.25-0.50%
— / 26-week (6-month)	4.50-4.75%	5.10%	T-bill +0.35-0.60%
— / 52-week (1-year)	4.50-4.75%	5.00%	T-bill +0.25-0.50%

T-bills generally pay slightly higher nominal rates — but the real advantage is the state tax exemption.

The State Tax Advantage

T-bill interest is exempt from state and local income taxes. HYSA interest is fully taxable. This makes T-bills worth significantly more in high-tax states.

Tax-Equivalent Yield: What a 5.00% T-Bill Is Really Worth

State	State Tax Rate	T-Bill Tax-Equivalent HYSA Rate
Texas, Florida, Nevada, Wyoming, etc.	0%	5.00% (no advantage)
Arizona	2.50%	5.13%
Colorado	4.40%	5.23%
Michigan	4.25%	5.22%
Illinois	4.95%	5.26%
Virginia	5.75%	5.31%
Massachusetts	5.00%	5.26%
New Jersey	6.37-10.75%	5.34-5.60%
New York	6.85-10.90%	5.37-5.61%
Minnesota	7.85-9.85%	5.43-5.55%
Oregon	8.75-9.90%	5.48-5.55%
California	9.30-13.30%	5.51-5.77%

Tax-equivalent yield = T-bill yield ÷ (1 − state tax rate)

A 5.00% T-bill in California (top bracket) is equivalent to a 5.77% HYSA. That’s a substantial advantage no savings account can match.

After-Tax Earnings on $50,000 (One Year)

Location	HYSA (4.50% − state tax)	T-Bill (5.00% − no state tax)	T-Bill Advantage
Texas (0% state)	$2,250	$2,500	$250
Colorado (4.40%)	$2,151	$2,500	$349
Illinois (4.95%)	$2,139	$2,500	$361
New York (6.85%)	$2,096	$2,500	$404
New Jersey (8.97%)	$2,048	$2,500	$452
California (9.30%)	$2,041	$2,500	$459
California (13.30%)	$1,951	$2,500	$549

Federal tax applies equally to both and is excluded from this comparison.

How Treasury Bills Work

T-bills are short-term government debt sold at a discount to face value:

Step	What Happens
1. Purchase	Buy a $10,000 T-bill for ~$9,750 (example)
2. Wait	Hold for 4-52 weeks depending on the term
3. Maturity	Receive full $10,000 face value
4. Your profit	$250 (the discount is your interest)

Where to Buy T-Bills

Platform	Fees	Auto-Reinvest	Ease of Use	Minimum
TreasuryDirect.gov	$0	✅ (up to 2 years)	Basic	$100
Fidelity	$0	✅	Excellent	$1,000
Schwab	$0	✅	Excellent	$1,000
Vanguard	$0	✅	Good	$1,000
*ETrade**	$0	✅	Good	$1,000

Buying at Auction vs Secondary Market

Method	How It Works	Best For
Auction (non-competitive bid)	Accept whatever rate the auction sets	Most individual investors
Auction (competitive bid)	Specify the rate you want (may not fill)	Experienced investors
Secondary market	Buy from other investors at current price	Immediate purchase (no waiting for auction)

For most people: Use non-competitive bids at auction. You’ll get the market rate with guaranteed fill.

T-Bill Ladder Strategy

Since T-bills mature on a set schedule, you can build a “ladder” for regular access:

Sample $50,000 T-Bill Ladder

Purchase	Amount	Term	Matures
T-Bill 1	$10,000	4-week	Every 4 weeks
T-Bill 2	$10,000	8-week	Every 8 weeks
T-Bill 3	$10,000	13-week	Every 13 weeks
T-Bill 4	$10,000	26-week	Every 26 weeks
T-Bill 5	$10,000	52-week	Every 52 weeks

Set each to auto-reinvest. At any point, you can stop reinvesting and receive cash at maturity.

T-Bill Ladder vs HYSA

Factor	T-Bill Ladder	HYSA
Yield (nominal)	Higher	Lower
After-tax yield (high-tax state)	Significantly higher	Lower
Access to cash	Every 4 weeks (if rolling)	Instantly
Effort to maintain	Moderate (set auto-reinvest)	None
Additional deposits	Must buy new bills	Deposit anytime
Partial withdrawals	Must wait for maturity	Withdraw any amount

Liquidity Comparison

Factor	HYSA	T-Bills
Access time	Same day or next business day	At maturity (4-52 weeks)
Sell early	N/A (withdraw freely)	Sell on secondary market (price varies slightly)
Early access cost	$0	Small bid-ask spread (typically <0.1%)
Partial withdrawal	Any amount	Must sell full bill (at maturity) or on market
Weekend/holiday access	Yes (app transfers)	No (market must be open to sell)
Emergency access	Immediate	1-3 days via secondary market

Winner: HYSA — instant access with no price risk. T-bills are liquid through the secondary market, but not as convenient.

Safety Comparison

Factor	HYSA	T-Bills
Backing	FDIC (US govt guarantee)	Direct US govt obligation
Coverage limit	$250,000 per depositor/bank	None (full amount backed)
Government backing	Treasury-backed insurance fund	Backed directly by taxing power
Credit risk	None (below $250K)	None
Interest rate risk	None (variable rate adjusts)	Minimal (short terms)
Inflation risk	Rate may lag inflation	Rate may lag inflation

For amounts under $250,000: effectively identical safety.
For amounts over $250,000: T-bills are safer (no insurance cap). You can also spread HYSA deposits across multiple banks for additional FDIC coverage.

Winner: T-bills for large amounts. Tie for under $250,000.

Complexity Comparison

Task	HYSA	T-Bills
Opening account	5-10 minutes	15-30 minutes (TreasuryDirect)
Making a deposit	Instant transfer	Buy at auction (weekly schedule) or secondary
Tracking earnings	Login to bank	Track discount, maturity dates
Tax filing	1099-INT (simple)	1099-INT (simple)
Reinvesting	Automatic	Auto-reinvest or manually rebuy
Adjusting strategy	Change nothing	Modify ladder, change terms
Time investment	~0 minutes/month	5-15 minutes/month

Winner: HYSA — significantly simpler to open, use, and maintain.

Best Uses for Each

Use a HYSA For:

Purpose	Why
Emergency fund	Instant access, no price risk
Sinking funds	Save for irregular expenses monthly
Short-term goals	Variable deposits, flexible withdrawals
Small balances	Under $5,000 — T-bill hassle not worth it
Frequent deposits	Adding money regularly from paychecks
Zero-tax states	No tax advantage from T-bills

Use T-Bills For:

Purpose	Why
Large cash reserves	Over $10,000+ makes the effort worthwhile
High-tax state residents	State tax exemption adds 0.25-0.75%+
Over $250,000	No FDIC cap — unlimited government backing
Known time horizon	Match T-bill term to when you need the money
Preservation of capital	Zero credit risk, US government backing
Part of bond allocation	Short-term fixed income in a portfolio

Who Should Choose a HYSA?

✅ You live in a no-income-tax state (Texas, Florida, Nevada, etc.)
✅ Your cash savings are under $10,000 — simplicity beats the small rate difference
✅ You need instant access to your money
✅ You make regular deposits from each paycheck
✅ You want zero effort — set it and forget it
✅ You’re saving for an emergency fund

Who Should Choose T-Bills?

✅ You live in a high-tax state (California, New York, New Jersey, Oregon)
✅ You have $10,000+ in cash reserves — worth the extra effort
✅ You have more than $250,000 — T-bills have no cap on government backing
✅ You’re comfortable with TreasuryDirect or a brokerage account
✅ You don’t need instant daily access to this money
✅ You want the highest possible after-tax yield on cash

Best Strategy: Use Both

Money	Where	Why
Emergency fund (3-6 months)	HYSA	Instant access, no complications
Short-term irregular savings	HYSA	Flexible deposits and withdrawals
Large cash reserves ($10K+)	T-Bill ladder	Higher after-tax yield
Over $250,000	T-Bills	No coverage limit
Down payment fund (known date)	T-Bill matching maturity	Highest after-tax guaranteed return

Sample Split: $75,000 Cash

Account	Amount	Product	After-Tax Yield (CA 9.3%)
Emergency fund	$25,000	HYSA (4.50%)	~4.08% after state tax
Working cash buffer	$5,000	HYSA	~4.08%
Short-term reserve	$20,000	13-week T-bills (auto-rolling)	5.00% (no state tax)
Medium-term reserve	$25,000	26-week T-bills (auto-rolling)	5.10% (no state tax)

Bottom Line

Category	Winner
Nominal rate	T-bills (slightly higher)
After-tax yield (high-tax states)	T-bills (significantly higher)
After-tax yield (no-tax states)	Depends on current rates
Liquidity	HYSA (instant access)
Safety (under $250K)	Tie
Safety (over $250K)	T-bills (no cap)
Simplicity	HYSA (much simpler)
Automatic savings	HYSA (auto-transfers, deposits)
Tax efficiency	T-bills (state tax exempt)
Best for most people	Depends on your state

If you live in a high-tax state (California, New York, New Jersey, Oregon, Minnesota), Treasury bills can earn you meaningfully more after taxes — a 5.00% T-bill is worth 5.50-5.77% compared to a HYSA in the highest-tax states. If you live in a no-income-tax state (Texas, Florida, Nevada, etc.), the decision comes down to rate and convenience — HYSAs are simpler and nearly as rewarding. Most people benefit from keeping their emergency fund in a HYSA for instant access and moving larger reserves into a T-bill ladder for higher after-tax income.