SGOV vs HYSA for Down Payment Savings: Which Earns More After Taxes?

You've got $30,000 saved for a house. It's sitting in your checking account earning effectively nothing. You know you should move it somewhere smarter, but the options are confusing: high-yield savings accounts, Treasury bills, SGOV, I Bonds, CDs. What's actually the best place to keep down payment savings — especially when you're 12-36 months from buying?

The short answer depends heavily on your state. In a high-tax state, SGOV (or direct T-bills) can earn meaningfully more than an HYSA on an after-tax basis, thanks to an exemption most people don't know exists.

The Core Principle: Safety First

Before comparing any of these options, accept one rule as non-negotiable: money needed within 36 months belongs in capital-preserving, principal-protected vehicles only.

This rules out stock market investments entirely. A 20-25% market correction in the year you're ready to buy doesn't just hurt your feelings — it delays homeownership by years. The risk of loss is categorically worse than the opportunity cost of not capturing equity market gains.

Down payment savings are not investment money. They're capital waiting to be deployed. The goal is yield with zero principal risk.

High-Yield Savings Accounts (HYSAs)

HYSAs offer immediate liquidity, FDIC insurance up to $250,000, and competitive APYs from digital banks. As of mid-2026, leading HYSA rates include:

• SoFi: up to 4.50% APY (requires qualifying direct deposits)
• Marcus by Goldman Sachs: 3.50% APY, no minimum balance
• American Express National Bank: 3.10% APY

Advantages:

• Money accessible within 1-3 business days
• No penalties for withdrawal
• No minimum holding period
• Rate stays competitive as long as the Fed holds rates elevated

Disadvantages:

• Variable rate — if the Fed cuts rates, yields drop
• Interest is fully taxable at federal and state level
• No state tax exemption

For buyers who might need to pull cash quickly — earnest money, inspection fees, sudden acceleration of their timeline — the HYSA wins on pure liquidity.

SGOV and Direct Treasury Bills

SGOV is an ETF from iShares that holds 0-3 month US Treasury bills. Similar funds include USFR (floating rate Treasuries) and VUSXX (Vanguard money market fund).

As of mid-2026, SGOV yields approximately 3.70-4.00% annualized, with monthly dividend distributions.

The key advantage that almost no consumer-facing article explains clearly: interest earned on direct obligations of the US government is exempt from state and local income taxes.

This is not a loophole. It's explicit in the IRS code and replicated at the state level in virtually every US state. Treasury interest is fully taxable federally but completely free from state and local tax.

Why This Matters in High-Tax States

If you live in a state with a high income tax rate, the after-tax yield comparison shifts significantly:

Example: $50,000 in down payment savings, 1-year horizon

• HYSA at 3.50% APY = $1,750 gross interest
• SGOV at 3.70% APY = $1,850 gross interest

Federal tax (assuming 22% bracket):

• HYSA after federal: $1,365
• SGOV after federal: $1,443

Now add state taxes. Assume you're in California (state income tax ~9.3%):

• HYSA state tax: $1,750 × 9.3% = $163 additional tax → After-tax yield: $1,202
• SGOV state tax: $0 (treasury interest is state-exempt) → After-tax yield: $1,443

The SGOV beats the HYSA by $241 annually on $50,000 saved — just from the state tax exemption.

In New York (top state rate ~10.9%), Connecticut (6.99%), Minnesota (9.85%), or Oregon (9.9%), the advantage is similar or larger.

In states with no income tax — Florida, Texas, Washington, Nevada, Wyoming — both options yield approximately the same after-tax return, and HYSA liquidity becomes the tiebreaker.

The Critical Tax Catch: Your Brokerage Won't Do This for You

Here's what catches most people out. When SGOV pays monthly dividends, your brokerage reports the total distributions on your 1099-DIV. They don't automatically separate the Treasury income from any non-Treasury income and they don't flag it as state-tax exempt on your form.

The burden is entirely on you (or your CPA) to:

1. Obtain the fund's annual report showing what percentage of distributions came from US government obligations
2. Manually calculate the state-exempt portion
3. Report the adjustment correctly on your state tax return

Most people skip this step and overpay state taxes. If you earned $1,850 from SGOV and failed to claim the exemption in California, you overpaid by $172.

This is the single tax optimization detail that pays for a structured financial planning tool more than any other.

Series I Savings Bonds

I Bonds are Treasury-issued instruments explicitly designed to protect against inflation. The interest rate adjusts every six months based on the CPI.

Current rate (May 2026 - October 2026): 4.26% composite rate (0.90% fixed + 3.34% inflation adjustment).

Advantages:

• State and local tax exempt (same as SGOV)
• Inflation-indexed protection
• FDIC/government backed

Disadvantages:

• Hard lock-up for the first 12 months — zero access, no exceptions
• Penalty of 3 months' interest if redeemed within 5 years
• Limited to $10,000 per person per year via TreasuryDirect
• Illiquid, not suitable for emergency portions of savings

For buyers 24-36 months from purchase: I Bonds make excellent sense for a portion of savings, particularly the tranche you're confident won't be needed for at least 12 months. The 3-month interest penalty on early redemption after 12 months is modest given the yield advantage.

For buyers 12-18 months from purchase: the 12-month lock-up creates too much risk of being unable to access funds when needed.

Treasury Bills Directly via TreasuryDirect

Individual T-bills (4-week, 8-week, 13-week, 26-week maturities) purchased directly at TreasuryDirect.gov provide the same state-tax exemption as SGOV without management fees.

Current T-bill yields (mid-2026): 3.60%-3.77% depending on maturity.

The disadvantage vs. SGOV is practical: TreasuryDirect has a clunky interface, requires manual purchase and rollover of maturing bills, and funds take several business days to become available after a bill matures. SGOV delivers the same state-tax exemption in a daily-traded ETF format that's more accessible.

CD Laddering: Lock in Rates with Rolling Liquidity

Certificates of Deposit offer fixed rates for defined terms — typically higher than HYSAs in exchange for agreeing not to withdraw early.

A CD ladder involves splitting savings across multiple CDs maturing at staggered intervals:

• $10,000 in a 3-month CD
• $10,000 in a 6-month CD
• $10,000 in a 9-month CD
• $10,000 in a 12-month CD

As each matures, either roll it forward or transfer to liquid savings if you're entering active house-hunting mode. This ensures you always have cash becoming available regularly while capturing the yield premium of longer terms.

Disadvantage: Early withdrawal penalties (typically 90-180 days of interest) if you need funds before maturity.

The Practical Allocation for Down Payment Savers

Based on timeline:

12 months or less from buying:

• 100% in HYSA or equivalent money market. Liquidity is everything. Don't lock anything up.

12-24 months from buying:

• Primary savings in HYSA or SGOV (choose based on your state's tax rate)
• Consider a CD ladder for funds you're confident won't be needed early
• Avoid I Bonds (the 12-month lock-up is too risky)

24-36+ months from buying:

• Up to $10,000 (per person) in I Bonds for the inflation hedge
• Remaining in SGOV/T-bills or CD ladder
• Avoid equity markets regardless of timeline

Keep your down payment, closing costs, and maintenance reserves in separate accounts or labeled sub-accounts. Commingling creates accounting confusion and psychological errors about how much you actually have available.

The Down Payment Savings Plan & Strategy Guide includes a yield optimization matrix that maps your exact time horizon to the right account structure — including the specific steps to claim the state tax exemption on Treasury income at filing time.