Tools · Banking Yield

Banking yield
calculator.

See exactly how much interest you're giving up by keeping savings at a big bank instead of a high-yield savings account. Three inputs, 30 seconds, the math that settles it.

Full setup guide: Where to Bank and How to Structure Your Accounts

This page covers US-specific accounts and tax law. Outside the US? The priority order is the same, the account names differ (ISA in the UK, TFSA/RRSP in Canada, Super in Australia, etc.).
$15,000
4.5%

APY assumes monthly compounding. Tax on interest not included. Compares ongoing interest only, not promotional teasers. Current HYSA rates: verify before opening.

What this tool assumes
  • Big-bank savings APY ~0.01%; HYSA APY approximately 3 to 4% as of April 2026 (varies, tracks the federal funds rate).
  • Compounding shown monthly at the quoted APY.

Not financial advice. APYs change. Verify rates before opening accounts.

Related

→ Banking, the full account setup guide this tool is built on → Emergency Fund, the primary target for your HYSA → Paycheck Allocator, map the HYSA transfer into your full plan
HOW THIS IS CALCULATED

This tool runs entirely in your browser — no data is sent to any server. All formulas use standard financial math. Verify the methodology or inspect the source code in your browser's dev tools.