High-Yield Savings: What the APY Actually Pays You
A 4.5% APY sounds great next to a 0.01% checking account. Here is what you actually keep after compounding and tax.
The headline rate is not what you keep
A high-yield savings account advertising 4.5% APY is quoting an annual percentage yield, which already assumes compounding. The number that arrives in your account is smaller, and three things eat into it.
How APY becomes cash
APY is the effective annual rate after compounding within the year. If a 10,000 balance earns 4.5% APY for a full year, the account credits about 450 in interest. That is the gross figure before tax.
Tax takes a slice
Interest from savings is taxed as ordinary income in most countries. If your marginal rate is 22%, that 450 becomes 351 after tax. At a 32% marginal rate it becomes 306. The higher your bracket, the more the headline rate shrinks.
The rate is not fixed
Savings APYs move with the central bank rate. A 4.5% account today can be 2% in a year if rates fall. Treat the current rate as temporary, not a contract for life.
Where it still wins
Even after tax, 4.5% on 10,000 leaves you hundreds ahead of a 0.01% checking account, which pays about 1 a year. The gap is real; the job is to not mistake the gross rate for the net one.
A simple check
Multiply your balance by the APY, then by (1 minus your marginal tax rate). That is roughly what you keep for a full year at that rate. Redo it whenever the rate changes.
ReservePath publishes general information only. Nothing here is personalised financial, tax or legal advice.
