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High-Interest Savings Calculator

↻ Updated 2026

See how a high-interest savings account (HISA) grows with regular deposits — and exactly how much interest you leave on the table by keeping cash in a low-rate big-bank account.

Educational calculators — always consult a licensed professional before making financial decisions.

Your inputs

Initial deposit

Monthly deposit

Interest rate

Years

Ending balance

$51,629

after 10 years

Interest earned

$10,629

at 4%

You deposited

$41,000

$300/mo + start

Balance growth4% · 10 yr

todayyear 10

Where the money comes from

Deposits$41,000

Interest$10,629

High-interest vs. a 0.05% big bank

High-interest account (4%)$51,629

Big-bank account (0.05%)$41,114

Interest at the big bank$114

You'd give up by staying$10,515

ASSUMPTIONS — Assumes a constant 4% rate compounded monthly with month-end deposits; the comparison account earns 0.05%. Advertised high-interest savings account (HISA) rates are variable and can change at any time. Interest is taxable in a non-registered account; holding a HISA inside a TFSA shelters it. Eligible deposits at a CDIC-member institution are protected up to applicable limits.

Runs entirely in your browser — nothing you enter is sent to us.How this works

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Sources & rate references

·Standard amortization / compound-interest formulas

Rates, brackets and limits here are checked against primary sources. If a number still looks off, email support@realmoneyiq.com and we'll review and fix it.

RealMoneyIQ provides free educational calculators, not financial, tax, investment or legal advice. Results are estimates based on the assumptions you enter and publicly published rates; your actual outcome will differ. Always confirm decisions with a licensed professional who knows your full situation.