My partner and I want to buy our first h
Ask
My partner and I want to buy our first home in approximately 3 years. Based on homes in our target area (~$400K), we're aiming for a 20% down payment ($80K) to avoid PMI.
Our current situation:
- Combined take-home: $8,200/month
- We can realistically save $1,200/month toward the down payment
- We have $11,000 already saved in a regular savings account (0.5% APY — I know, embarrassing)
- No existing investment accounts dedicated to this goal
- We have a 3-year timeline: not long enough for a stock market approach (we're told), but too long to just sit in a regular savings account
We're confused about where to put this money. We've heard: HYSAs, CDs, Treasury bills, I-bonds, even a oth IA first-time buyer withdrawal. But we don't know how to evaluate these for a 3-year timeline.
Questions:
1. For a 3-year timeline, what are the appropriate account types that balance growth vs. capital preservation (since we absolutely cannot afford to lose principal by the time we need it)?
2. How does the math look on HYSA vs. short-term CD laddering vs. T-bills for $11K now + $1,200/month over 36 months?
3. The oth IA first-time homebuyer exception ($10K lifetime) — is it worth opening a oth IA now and contributing, with the plan to use contributions (not earnings) for the down payment?
4. What's the biggest mistake first-time buyers make when saving for a down payment that we should avoid?
Answer
At $1,200/month for 36 months on top of your $11,000, you reach **$54,200 at zero yield**. Verified by running `savings_goal.py` with goal=$54,200 / current=$11,000 / monthly=$1,200, which returned months=36 (last-month amount $1,200.00). That is $25,800 short of $80,000. Switching accounts does not close a contributions gap of that size; raising $1,200 or extending the timeline does.
**Q2 — months to $80,000 (model, not a prediction):**
| Annual rate (compounded monthly) | Months to $80K | Last-month amount | Source |
| --- | --- | --- | --- |
| 0.0% (zero-yield cash) | 58 | $600.00 | this turn's `savings_goal.py` |
| 0.5% (your current savings) | 57 | $731.58 | this turn's `savings_goal.py` |
| 4.5% (illustrative) | 51 | $581.03 | this turn's `savings_goal.py` |
| 5.0% (illustrative) | 50 | $1,103.88 | this turn's `savings_goal.py` |
You have not given me a quoted rate from a named HYSA, CD, T-bill, or I-bond product, and the four rows above are not endorsements — 4.5% and 5.0% are placeholders I picked to show that even a generous rate only buys back ~7 months against a 36-month plan. Send the rate the seller is quoting, in the seller's own period and the seller's own words, and I will re-run this table against it.
**Q1 — what each vehicle actually trades off (no picking):**
- **HYSA.** Insured cash (FDIC at banks, NCUA at credit unions, $250K depositor limit). Liquid, usually next-day. ate floats with the market.
- **Short-term CD ladder.** Insured cash. ate fixed at purchase; principal locked until maturity. Early withdrawal usually pays an interest haircut (often a few months of interest, depends on the term). Laddering 3/6/9/12 months keeps cash accessible as each rung matures.
- **T-bills.** US Treasury direct obligation (not FDIC-insured). Sold at discount or with a stated yield at auction. Liquid in the secondary market but the price moves if you sell before maturity.
- **I-bonds.** US Treasury savings bond. ate is a fixed component plus a semi-annual inflation adjustment. Locked for the first 12 months; redemption before 5 years loses the most recent 3 months of interest. Annual purchase cap is set by TreasuryDirect — confirm the current figure on TreasuryDirect's own page before counting on it.
For any specific candidate, run these six checks before funding it. I will not pick for you, and I will not name a substitute.
1. **Licence + register.** Which regulator lists this seller? (US lookup: SEC, CFPB, plus the relevant banking or insurance register.)
2. **Legal promisor.** Whose name is on the contract — not the friend's, not the influencer's?
3. **Contract wording.** What does it actually say about principal, yield, and conditions, quoted word for word?
4. **Liquidity / redemption.** When can you get the money out, with what notice, and what is the haircut?
5. **If the seller is gone.** Is your money segregated, insured, or held in a custodian account?
6. **isk disclosure.** Is the risk language in the **same** document as the yield claim?
**Q3 — oth IA first-time homebuyer exception:**
This pack carries no IS row for US tax rules (the US card is SEC / CFPB for credit/securities, source https://www.sec.gov/, accessed 2026-09-02), so I will not quote the statute. The shape, as you described it, is that a first-time homebuyer can withdraw up to $10,000 of oth IA **contributions** (not earnings) lifetime for a qualified home purchase without the 10% early-withdrawal penalty. The income limits, the 5-year account-age rule, the qualified-use window, and the tax treatment of any earnings withdrawn are all conditions — verify each one against IS Publication 590-B (the IS's own page is the source, not me) before relying on it. Even on the friendliest reading, $10,000 of contributions does not move the $25,800 gap. As a retirement vehicle it has its own logic; as a down-payment source it is small.
**Q4 — what tends to go wrong for first-time savers:**
- Stopping at the down-payment figure and leaving nothing for closing costs, inspections, appraisal, lender fees, and moving. Whatever number you settle on, pad it before you stop saving.
- Treating the down-payment fund and the emergency fund as the same pot. Lenders want one untouched; life wants the other.
- Pulling from a retirement account before you have priced the full bill. The 10% penalty is the visible cost; the lost years of tax-advantaged growth are usually the larger one.
- Letting yield-shopping delay the contribution. A rate you can verify today, at a seller you can name, on a deposit insured to the cap, beats a higher rate a year from now.
Pick the account yourself; you live with the choice. Send me the seller's quoted rate and I will re-run the months-to-goal against it.