How to Build a CD Ladder for Your Down Payment

High-yield savings accounts are flexible, but their rates can drop whenever the Federal Reserve cuts. Certificates of deposit lock in a rate, but tie your money up. A CD ladder combines the two: you split your savings across several CDs that mature at different times, so part of your money becomes available on a regular schedule while the rest keeps earning a fixed rate.

For a down payment fund with a rough target date, a ladder can be a useful middle ground. This guide shows how to build one and how to avoid the common mistakes.

How CDs work

A certificate of deposit is a deposit account with a fixed term and, usually, a fixed rate. You agree to leave the money in place until the CD matures. If you withdraw early, you'll typically pay a penalty, often a set number of months of interest. Bank CDs are covered by FDIC insurance and credit union certificates by NCUA insurance, up to $250,000 per depositor, per institution, per ownership category. The SEC's Investor.gov explains CD basics and the questions to ask.

Why a ladder instead of one CD?

Putting your whole fund in a single two-year CD might get a good rate, but you'd pay a penalty if you found a home sooner. A ladder spreads the money so that:

• Some cash becomes available regularly, without penalties.
• You lock in rates on part of your money, protecting you if savings rates fall.
• You can adapt as your timeline gets clearer, by rolling a maturing CD into a new one or moving it to savings.

Building a ladder step by step

Step 1: Decide what stays liquid

Keep money you might need on short notice, like earnest money and a few months of expenses, in a high-yield savings account. Only ladder what you're confident you won't need before each CD's maturity. See our guide to how to find a good HYSA.

Step 2: Match the rungs to your timeline

If you expect to buy in about 18 months, you might create rungs maturing at 6, 12 and 18 months. If your timeline is two to three years, use 6-month spacing out to 24 or 30 months.

Step 3: Split the money

Divide the ladder portion roughly equally across the rungs, or put more in the later rungs if you're sure about your date.

Step 4: Decide what to do at each maturity

When a CD matures:

• If you're still a ways from buying, roll it into a new CD that matures before your target date.
• If you're close to buying or actively house hunting, move it to your HYSA so it's ready.

Most banks give you a short grace period after maturity to withdraw or change terms before the CD automatically renews. Set calendar reminders so a CD doesn't automatically roll into a longer term than you want.

Worked example

Suppose your goal is 10% down on a home at the national median price of $410,700 (Q2 2026), or $41,070, and you've saved $24,642 so far. You plan to buy in about 18 months and keep saving monthly.

New monthly savings go into the HYSA. At month 6, if you're not house hunting yet, roll that CD to mature around month 18. By the time you're shopping seriously, most of the fund is either liquid or about to be.

Weighing the early withdrawal penalty

If you find the perfect home early, you can still break a CD; you'll just pay the penalty. Compare it to the interest you've earned. For example, a 6-month penalty on a 12-month CD at 4% APY costs roughly half a year of interest, or about 2% of the balance. That's not catastrophic, but it's worth avoiding, which is why the liquid portion matters.

Some banks offer no-penalty CDs, which allow withdrawal after a short initial period. Their rates are usually lower than standard CDs but can be competitive with savings accounts.

CDs vs. Treasury bills

Treasury bills can do the same job as CDs, with terms from 4 to 52 weeks. The main difference is taxes: T-bill interest is exempt from state and local income tax, while CD interest is fully taxable. In high-tax states, T-bills can come out ahead even at a slightly lower stated yield. Our T-bill guide explains how to compare them.

Where rates come from

CD rates generally reflect expectations for short-term interest rates. The effective federal funds rate averaged 3.75% in September 2026. If the Fed is expected to cut, longer CDs may offer lower rates than shorter ones. The FDIC publishes national average CD rates on its national rates page, a useful benchmark for spotting a good offer.

Common questions

What if I find a house before a CD matures? You can usually break the CD and pay the early withdrawal penalty, or use your liquid savings for the earnest money and close after the next rung matures if timing allows. Ask lenders whether funds in a CD count toward your verified assets.

Are brokered CDs different? Brokered CDs are bought through a brokerage. They can be FDIC-insured, but instead of an early withdrawal penalty you may have to sell on the secondary market, where the price can be lower than what you paid.

How many rungs should I have? Three or four is usually enough for a house fund. More rungs add complexity without much benefit over a short horizon.

Extra reading on CDs and ladders

Bank and credit-union product pages change often. A practical certificates of deposit or personal finance book can walk through early-withdrawal penalties, brokered CDs and ladder mechanics with more examples than a single article.

certificates of deposit investing books on Amazon (Affiliate link. We may earn a commission.)

Practical takeaways

• A CD ladder locks in rates on part of your fund while keeping money available on a schedule.
• Keep earnest money and an emergency cushion in a high-yield savings account, outside the ladder.
• Time rungs so they mature before your target purchase date, and set reminders before each maturity.
• Compare CDs with T-bills, especially if you live in a high-tax state.
• Track every CD and its maturity date in our savings tracker, and see what your fund buys in the calculators.

Sources

• Investor.gov: Certificates of deposit
• FDIC: National rates and rate caps
• FDIC: Understanding deposit insurance
• NCUA: Share insurance coverage
• TreasuryDirect: Treasury bills

Rates and prices are as of the dates noted and will change. This article is for education only and is not financial advice.