If you set aside $20,000 across the year for federal and state quarterly taxes, leaving that cash in a traditional brick-and-mortar checking account earning 0.01% is leaving hundreds of dollars on the table. A dedicated High-Yield Savings Account (HYSA) puts that idle cash to work.

Why Compound Interest on Tax Reserves Matters

Holding an average balance of $15,000 in a high-yield account yielding 4.50% APY generates over $675 in annual passive interest — easily covering the cost of your accounting software and domain renewals.

Top Features to Look For

  • Sub-Accounts or "Buckets": Platforms like Ally, Live Oak Bank, and Relay allow you to segment savings into visual envelopes: "Q1 Taxes", "Q2 Taxes", "Emergency Reserve", and "Equipment Replacement".
  • Fast ACH Transfers: 1-to-2 day transfer speeds back to your primary operating checking account so you can pay IRS quarterly deadlines on time.
  • FDIC Insurance: Ensure standard $250,000 (or sweep-network multi-million dollar) FDIC insurance coverage.