The inputs that control the result
Required input: Use low, typical and high balances
Downside case: Subtract expected fees
Decision threshold: Check tiers, caps and qualification rules
Calculate net annual value
Estimate interest using the balance you realistically maintain, then subtract expected monthly fees and unavoidable service costs. Do not assume you will meet a waiver condition unless it matches your normal behavior.
Worked example
At a $2,000 average balance, a 4% APY produces roughly $80 before compounding details. One $10 monthly fee would cost $120 per year, turning the headline yield into a negative net result.
Check the boundaries
- Is the APY promotional, tiered or capped?
- Which transactions qualify for the advertised yield?
- How quickly can the bank change terms?
- Are transfer, ATM or overdraft fees relevant to your actual use?
Primary source: FDIC: financial products that are insured.
Compare a realistic balance range
Run the calculation at a low, typical and high monthly balance. This matters when APY tiers, caps or monthly fees change at a threshold. A product that wins only at the highest balance may be a poor fit for most of the year.
Value access without pretending it is interest
Branch access, fast transfers and responsive support can be useful, but keep that value separate from the APY calculation. This makes the tradeoff explicit. Before moving a large balance, review deposit insurance ownership categories and verify the institution that legally holds the funds.
Use net annual dollars as the common measure
APY reflects compounding, while the quick worksheet uses a stable balance for a planning estimate. Convert each account to approximate annual interest, subtract fees and show the result in dollars. This makes a modest rate difference comparable with a fixed monthly charge.
Illustrative fee threshold
At a $4,000 balance, an extra 0.50 percentage point is worth roughly $20 over a year before balance changes. A $5 monthly fee costs $60. The higher headline yield loses unless the fee is reliably waived.
Model the balance that actually remains
Transaction accounts rise and fall through the month. Savings may be drawn down for its intended purpose. Run low, typical and high balances rather than using today's peak. If a promotional or tiered APY applies only to part of the balance, calculate each portion separately.
Audit qualification effort
Record direct-deposit, debit-transaction, login or balance requirements and what happens when one is missed. Do not value an account as fee-free unless the waiver fits normal behavior. Keep access benefits - Branches, fast transfers or service - Visible as a separate judgment rather than hiding them inside an interest calculation.
Additional source: CFPB: compare checking interest with fees and terms.
Recheck after the promotional window
Set a reminder for the first statement after any introductory rate or fee waiver ends. Recalculate using the new APY, actual balance and posted fees. If the account no longer wins, include transfer time, closure steps and any accrued-interest timing before moving the money.
Reuse the verified inputs: Keep the same amounts, dates and downside assumptions when you open the connected guides. Use the same normal balance and transaction pattern when comparing money-market and savings tradeoffs with checking and savings account roles; headline yield or convenience is meaningful only after fees, access and deposit protection are checked. See the bank account fees and yield guides for the complete sequence.
Fee-adjusted APY worksheet
Estimate one year of simple interest at a stable balance, then subtract expected monthly fees.
Keep the calculation reproducible
Write down the inputs, source dates and threshold so the result can be checked later.
Use the result as a threshold
Compare bank accounts using interest at your realistic balance minus expected fees. A higher APY wins only when qualification rules are sustainable and the added interest exceeds monthly, transaction and access costs.
Build your bank account comparison brief →This guide provides general education. Examples are illustrative, not market quotes. Verify current product terms and obtain individualized advice when needed.