Is Moving Your Retirement Cash Worth a Higher Interest Rate?
You notice a higher interest rate than the one your retirement cash earns today. Moving the money could help pay for something you value. It could also add an account to watch, a transfer to arrange, or a delay before money reaches checking.
Neither the higher rate nor the extra work settles the decision. A familiar arrangement can be worth keeping, and a better-paying one can be worth the effort. First ask how much more you would earn before you need the money, then consider what would change when you use it.
How much more would you actually earn?
For two deposit accounts, begin with the annual percentage yield, or APY, which reflects compounding. Check the balance needed to earn it, whether the rate can change, and any fees. The account disclosures should explain those terms.[1] A high advertised rate may be less useful if it applies only briefly or to part of your balance.
Translate the difference into dollars over your expected holding period. As a simple estimate, multiply the balance by the annual rate advantage and the fraction of a year you expect to keep it there. Use the likely average balance if you will spend some along the way.
Same rate advantage. Different time to earn it.
An extra 0.50 percentage point per year on $60,000
Needed in 3 months
About $75
Extra interest before taxes and fees
Not needed for 12 months
About $300
Extra interest before taxes and fees
The same rate advantage produces different dollar benefits when the spending date changes.
Hypothetical simple estimates: constant balance and rate difference; no compounding. These are not current rate quotes.
Then compare what you could keep after taxes and fees. For money held outside retirement accounts, interest on bank deposits is generally taxable. Treasury interest is subject to federal income tax but exempt from state and local income taxes.[2] Ask your tax professional to account for differences that matter to your comparison. The highest quoted rate may not produce the highest spendable benefit.
What would the move change in your routine?
Picture the next bill, trip or home expense this cash must cover. Would you pay from the new account, or transfer money elsewhere first? Confirm when transferred funds become available, any transaction limits, and what happens if you need help. Savings-account withdrawal rules and minimum-balance fees vary by institution.[3]
Include the work after opening day: monitoring the balance, keeping account details up to date, and learning how to get help. If someone shares these responsibilities, consider whether the new arrangement works for that person too. You do not need to assign an hourly wage to every task. You do need to decide whether the expected benefit is worth the added work.
A straightforward transfer that produces meaningful extra income can be worthwhile. A small, short-lived gain that requires repeated moves may be less appealing. The calculation gives you a benefit to weigh; your priorities determine its value.
Are you comparing the same kinds of accounts and investments?
A savings account, bank money market account, money market fund and Treasury security can serve different purposes. A money market fund is an investment, not a federally insured bank deposit.[3] The stated interest rate on a Treasury note or bond does not, by itself, show what you will earn at the price you pay. Its price can change, and selling before the date it repays principal can change your return.[4]
If you consider a certificate of deposit, include its term and possible early-withdrawal penalty.[3] For a brokerage holding, confirm how selling and transferring would get money to the account you spend from. SIPC provides protection for qualifying assets when a member brokerage fails; it does not protect against market losses or guarantee promised investment performance.[5]
These differences do not automatically rule out a move. They tell you what else you are changing besides the rate. Compare the actual terms over the same spending period before treating two percentages as equivalent.
Dovetail Principle: Information Should Show What Changes for You
A useful comparison shows what changes in dollars and in daily life. Consider how much more you could earn, when you can use the money and what you must do to manage it. A percentage alone cannot show whether the move improves the arrangement for you.
What would make the move worthwhile for you?
Start with what the cash needs to pay for. Your choices depend on how and when you need to use the money, how long you can leave it in place and the taxes involved.[6] Money for a near-term payment has less time to earn an advantage than money you can leave untouched. Do not extend its holding period merely to make the comparison look better.
You can keep the present arrangement, move a defined portion, or reconsider when a holding matures or a planned expense passes. Keeping bill-paying cash in place while moving money needed later may preserve convenience, but an extra account still needs to justify its costs and upkeep.
Decide what would make the benefit meaningful for you, using realistic earnings and acceptable access terms. Move when that benefit is worth the change. Stay when the current arrangement serves you better, and decide what would prompt you to reconsider. A higher rate deserves consideration; the better choice is the one whose additional earnings and practical demands fit the retirement you want to live.
For the separate question of how much cash belongs in the reserve, read How Much Cash Should You Keep for the First Years of Retirement?.
