I ignored the difference between APR and APY for years. They looked like the same alphabet soup to me, honestly. Then one afternoon I actually did the math on my savings account next to my credit card, and it hit me why banks quote one number on what you borrow and a totally different one on what you save. Spoiler: it's not a coincidence.
The short version
APR is the yearly cost of borrowing, and it leaves out compounding. APY is the yearly return on savings, and it includes compounding. Same underlying rate — but that little gap between the two numbers? That's compounding doing its thing.
Why banks show you each one
Here's the slightly cynical bit. Banks tend to advertise whichever number flatters them.
On a loan or credit card, they quote the APR — no compounding baked in, so the cost looks smaller.
On a savings account or CD, they quote the APY — compounding included, so the return looks bigger.
Once you notice this, you stop comparing apples to oranges without realizing it.
A quick example
Take a 12% rate compounded monthly. As an APR, it's just 12%. But as an APY, that monthly compounding nudges it up to about 12.68%. When you're borrowing, that gap works against you. When you're saving, it works for you. Same math, opposite feelings.
What I actually do now
Compare like with like — APR to APR when shopping loans, APY to APY when shopping savings. And on a credit card, remember the APR only bites if you carry a balance past the due date. Pay in full and the grace period usually means you owe nothing in interest at all.
Small distinction, real money.
I originally wrote a fuller version of this over on Coinscribed: https://www.coinscribed.com/news/apr-vs-apy
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