How Much Interest Will $250K Earn in a HYSA?
TL;DR
At 4.25% APY, $250,000 in a top HYSA earns approximately $10,840 in year one (monthly compounding). Over 3 years, it earns ~$33,260 if the rate holds, ~$27,000-$30,000 if the Fed cuts. A 3-year MYGA at 5.30% locks ~$41,900 over the same window plus tax deferral. The $250K threshold also matters because it's the FDIC limit per bank per depositor.
Quick answer
$250,000 in a HYSA earning a top-of-market 4.25% APY produces roughly $10,840 of interest in year one, assuming monthly compounding and the rate holding for 12 months. That figure scales linearly from the $100K math. The HYSA does not pay a "jumbo" premium at higher balances.
$250,000 is also the FDIC insurance limit per depositor per insured bank per ownership category. If you have $250K in a HYSA, you are at the cap; any additional dollar above $250K is uninsured at that bank.
Year-one and multi-year math
| HYSA APY | Year-1 interest | 3-year interest (rate held) | 5-year interest (rate held) |
|---|---|---|---|
| 3.50% | $8,893 | $27,165 | $46,898 |
| 3.75% | $9,537 | $29,180 | $50,410 |
| 4.00% | $10,184 | $31,215 | $53,961 |
| 4.10% | $10,444 | $32,033 | $55,392 |
| 4.25% | $10,835 | $33,260 | $57,547 |
| 4.50% | $11,488 | $35,318 | $61,147 |
| 5.00% | $12,791 | $39,464 | $68,486 |
Numbers assume monthly compounding on a stable $250,000 balance with no deposits or withdrawals over the period.
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The variable-rate reality on $250K
The frozen-rate columns are misleading for anything past 12 months. HYSAs are variable. Three realistic 3-year paths from today's 4.25% starting point:
| Path | 3-yr blended APY | Approx. interest on $250K |
|---|---|---|
| Rates hold flat at 4.25% (no Fed action) | 4.25% | ~$33,260 |
| Fed cuts 100 bps over Year 1, then pauses | ~3.85% | ~$30,000 |
| Fed cuts 200 bps over Year 1, then pauses | ~3.45% | ~$26,800 |
| Fed cuts 100 bps then hikes 50 bps | ~3.95% | ~$30,775 |
Realistic 3-year HYSA interest on $250K lands in the $26,800-$33,260 band. The midpoint is roughly $30,000, or 12% of principal pre-tax.
The table leaves out rising rates, which is what happened next: the Fed made no cuts in 2026 and raised its target range 0.25 point to 3.75-4.00% on September 16, 2026 (FOMC statement). All paths are hypothetical, not forecasts.
Compare: 3-year CD and 3-year MYGA on $250K
| Product | Indicative APY (June 2026) | 3-yr interest | Tax treatment |
|---|---|---|---|
| HYSA (variable, midcase) | ~3.85% | ~$30,000 | Annual 1099-INT |
| 3-year bank CD (locked) | 4.30% | ~$33,675 | Annual 1099-INT |
| 3-year MYGA (A-rated, locked) | 5.30% | ~$41,875 | Deferred to withdrawal |
The CD beats the HYSA midcase by ~$3,675 over 3 years. The MYGA beats the HYSA midcase by ~$11,875 before tax-deferral compounding. In a 24% bracket, the MYGA's deferral edge over the annually-taxed HYSA adds another ~$1,800-$2,500 of after-tax value.
The FDIC ceiling problem
$250,000 sits exactly at the FDIC coverage cap per depositor per insured bank per ownership category. If you let your HYSA grow past $250K through interest accumulation, the excess is uninsured at that bank. Real options:
- Move excess to a second insured bank. Open a second HYSA at a different institution. Each $250K bucket has its own coverage. Mechanically simple, but adds tax-statement management.
- Use a sweep network. Wealthfront Cash, Betterment Cash Reserve, and IntraFi-network banks sweep your deposit across 10-30 partner banks, providing FDIC coverage up to $2-8 million on a single account. Yield is typically 10-30 bps below a top single-bank HYSA.
- Add a joint owner. A joint account at the same bank gets a separate $250K coverage tier, raising your single-bank cap to $500K.
- Move the excess into a MYGA. State guaranty association limits run $250K-$300K per owner per carrier in most states, paralleling the FDIC math. A MYGA at a different carrier than your HYSA bank gives you a fresh coverage tier.
After-tax math on $250K
$10,840 of HYSA interest in a 24% federal + 9.3% CA marginal bracket loses $3,613 to taxes. Take-home: $7,227. Effective after-tax yield: 2.89% on $250,000.
A non-qualified MYGA defers all that tax. At end of 3 years, you would owe ordinary income tax on the accumulated interest, but you have had 36 months of pre-tax compounding. The deferral compounding edge is roughly $1,800-$2,500 in a 24% bracket over a 3-year window on $250K.
When the answer changes
- The HYSA bank is paying a teaser rate. Some online banks promote 5.0-5.5% APY for the first 6 months, then drop to 3.5% or lower. Read the rate sheet carefully.
- You are in a 0 or 12% bracket. The MYGA's tax-deferral edge shrinks meaningfully. The yield gap still favors MYGA, but by less.
- You need liquidity above the MYGA's 10% annual penalty-free withdrawal. If you anticipate needing $100K+ unexpectedly, the HYSA's instant liquidity is worth the yield gap.
- The Fed is hiking. Variable HYSA wins during hike cycles. See should I move from HYSA to CD when rates rise.
Common mistakes
- Sitting on $250K in a 0.5% APY brick-and-mortar savings account. Costs you ~$10,000 per year in foregone interest vs a top HYSA. The single biggest savings-side mistake people make.
- Letting the HYSA grow past $250K without FDIC planning. The excess is uninsured. If the bank fails, you might wait months for the receiver to dispose of uninsured deposits.
- Holding $250K in HYSA for 5+ years when you don't need it. The opportunity cost vs a 5-year MYGA is $15K-$25K of lost interest plus tax deferral.
- Assuming the HYSA rate will hold. The 2022-2025 cycle saw HYSA APYs go from 0.50% to 5.00% to 4.10%. Variable means variable.
- Ignoring state tax on HYSA interest. In CA, NY, OR, MN, MA, NJ, MD, IL, the state tax on $10K+ of HYSA interest is $300-$1,300. Treasury bills are exempt from state tax.
What to do next
If your $250K is in a HYSA earning under 4.0% APY, switch to a top-tier HYSA. Top online HYSAs paid 3.00-4.00% APY on September 24, 2026 (bank sites: Marcus 3.50%, Capital One 360 3.10%, Ally 3.00%).
If your $250K is already in a top HYSA and you have a 3+ year horizon, run the MYGA comparison. The locked 5.30% rate plus tax deferral typically wins by $11,000-$14,000 on $250K over 3 years if the Fed cuts during that window. For larger balances, the savings get larger. See HYSA vs MYGA for 3-year money and CD vs MYGA ladder.
Frequently asked follow-up questions
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Disclosure
This article reflects publicly available HYSA, CD, and annuity rate information approximate to the date above. High-yield savings rates are variable and change frequently, often weekly. Always confirm current rates directly with the institution before opening or transferring. This is general educational content, not a personalized recommendation, solicitation, or offer of any specific product. Hans Goldstein is an independent licensed insurance producer (NPN 20602398) appointed with multiple A-rated carriers in the fixed-annuity market; Goldstein & Co. LLC is not a bank, broker-dealer, or registered investment adviser. HYSAs and CDs are deposit products of FDIC-insured banks or NCUA-insured credit unions; MYGAs and other annuities are insurance contracts backed by the issuing carrier and state guaranty associations. FDIC and NCUA insurance limits are typically $250,000 per depositor per institution per ownership category. Tax discussion reflects federal law as of 2026 and is subject to change; consult a tax professional for your situation.