Nominal vs. Real Returns

When a bank advertises an interest rate, they are stating the Nominal Rate. This is the raw percentage your money will grow. If you put $1,000 in a 5% account, you will have $1,050 next year.

But what if the cost of groceries, rent, and gas went up by 4% during that same year? It now costs $1,040 to buy what used to cost $1,000. Your $50 gain is mostly wiped out by increased costs.

The Real Return is the nominal return minus the inflation rate. In this example, your real return is roughly 1%.

The Impact of Taxes

Unfortunately, the math gets worse. The government taxes you on your nominal return, not your real return.

If you earn 5% interest in a non-registered account, and your marginal tax rate is 30%, you lose 1.5% to taxes. Your after-tax nominal return is now 3.5%. If inflation is 4%, your after-tax real return is -0.5%. You are literally losing purchasing power by keeping your money in the bank.

Calculate Your Real Return

How to Protect Your Cash

If holding cash often results in a negative real return, what should a FIRE practitioner do?

• Minimize Cash Holdings: Keep your cash emergency fund strictly limited to what you actually need (3-6 months), and invest the rest in appreciating assets like equities or real estate.
• Use Tax-Advantaged Accounts: Hold your cash or Money Market Funds inside a TFSA or Roth IRA to eliminate the tax drag, improving your real return.
• Lock in Peak Rates: When interest rates are high but inflation begins to drop, build a GIC Ladder to lock in the high nominal rates for the next 3-5 years.

For a complete breakdown of all your cash options, read our overarching guide: Cash Savings Compared.