Common Tax Mistakes to Avoid in 2026

Tax season isn’t just about what you claim — it’s also about what you avoid. After spending the last two weeks looking at income, credits, and deductions, this week we’re shifting to the quiet traps that can cost people money without them realizing it.

Here are the most common mistakes I see year after year, and how you can sidestep them with confidence.

1. Filing Before All Your Documents Arrive

It’s tempting to file early, but missing a W‑2 or 1099 can trigger an amended return later. If you’re expecting income from multiple places, give everything time to land.

2. Forgetting About Digital Income

Side gigs, online sales, freelance work, content creation — it all counts. If money hit your account, assume it’s reportable unless a tax professional tells you otherwise.

3. Overlooking Small Deductions That Add Up

People often skip deductions because they seem “too small.” But childcare statements, education expenses, job‑related costs, and certain medical expenses can make a real difference when combined.

4. Not Tracking Business Expenses Properly

If you’re self‑employed, your expenses matter. Mileage, supplies, software, subscriptions — they’re all part of the picture. Even a simple spreadsheet can save you hundreds.

5. Missing Out on Credits You Qualify For

Last week we talked about the big ones for 2026. The mistake isn’t usually claiming something you shouldn’t — it’s not claiming something you could have.

6. Waiting Until the Last Minute

Rushing leads to errors. Give yourself time to gather, review, and breathe. Tax season is a marathon, not a sprint.

A Smooth Filing Season Starts with Awareness

You don’t have to be perfect — you just have to be prepared. Avoiding these common mistakes keeps more money in your pocket and reduces the stress that so many people feel this time of year.