How to tell if you overpaid taxes last year

Overpaying rarely feels like a mistake in the moment

You filed. The refund arrived (or the balance due cleared). Life moved on. The overpayment is quiet: an R&D credit never claimed, owner draws booked as salary when they should not have been, home-office rules ignored, or entity structure that made sense two years ago and costs you now.

Bench-style services sell peace of mind with humans on the books. The same principle applies to tax: someone has to look. Software alone will not tell you what you left on the table last year.

Five signs last year’s return left money behind

• You used DIY software and guessed on gray areas — TurboTax and similar tools are great at forms, weak at strategy.
• Books and the return do not match — if P&L categories are messy, deductions get missed or misclassified.
• No quarterly review — tax planning done only in April is damage control, not design.
• Entity or payroll changed mid-year — S-corp elections, contractor-to-W2 shifts, and multi-state work create easy misses.
• You never saw a “could have saved” estimate — if nobody modeled alternatives against your actual return, you are flying blind.

A 10-minute checklist before you assume last year is closed

1. Pull last year’s return and the final P&L. Do major expense buckets look familiar — or mysterious?
2. List one-time events: equipment buys, a home office, travel, R&D, hiring, or a state expansion.
3. Ask whether anyone reviewed entity type, retirement contributions, and estimated payments against actual income.
4. Separate bookkeeping quality from tax strategy. Clean books make strategy possible; dirty books hide it.
5. Run a confidential overpayment pass before you wait another year.

Use TaxBooks free assessment to see what you may have overpaid

TaxBooks starts with a free, private assessment: upload last year’s return, get a “could have saved” report, no card required. Experts and CPA path come later — Silver keeps the books; Gold adds CPA consultation with legal savings guaranteed or you pay $0.

Start here: moneychoice.us/taxbooks#plans → Free → See my overpayment.