The Warning Signs to Catch Before Filing Season, Not During It
By the end of this lesson, you'll understand:
An unexpected tax bill is one of the most stressful financial surprises, largely because it's avoidable with a mid-year check-in. Most large, surprise balances trace back to a handful of predictable causes, a life change, additional untaxed income, or outdated withholding, each of which can be caught well before the deadline.
A new job with insufficient withholding, a second job or side income without adjusted withholding, self-employment or freelance income without estimated payments, the loss of a dependent or credit you previously claimed, a large capital gain, or a life change (marriage, divorce) that shifted your filing status are all common triggers for an unexpectedly large bill.
What to check: If any of these applied to you this year, treat it as a signal to run a mid-year tax check rather than waiting until filing season to find out.
The IRS generally doesn't penalize you for owing a balance at filing time, as long as you've paid enough throughout the year to meet a safe harbor: typically at least 90% of your current year's tax liability, or 100% of your prior year's tax liability (110% if your prior-year AGI was above $150,000), whichever is smaller.
What to check: Confirm the current year's exact safe harbor thresholds at IRS.gov, since they're the baseline for whether you'll face an underpayment penalty in addition to simply owing a balance.
Around mid-year, compare your total withholding and estimated payments so far against a rough estimate of your full-year tax liability, especially if your income situation has changed. This gives you time to adjust your W-4 or increase estimated payments before the gap becomes a large, unavoidable balance.
What to check: Use the IRS Tax Withholding Estimator with a mid-year pay stub, factoring in any known additional income for the rest of the year, to catch a shortfall while there's still time to correct it.
If you're already aware you'll owe a significant balance, you can increase withholding for the rest of the year (via an updated W-4), make an additional estimated tax payment, or simply plan and budget for the balance due by the deadline rather than being caught off guard.
What to check: If you can't pay the full balance by the deadline, the IRS offers payment plans, filing on time and paying what you can is generally better than not filing at all, since separate penalties apply to late filing versus late payment.
Ben took on a substantial freelance project mid-year alongside his full-time job, earning an additional $12,000 with no tax withheld. In August, he runs a mid-year check using the IRS Tax Withholding Estimator, factoring in the freelance income, and discovers he's on track to owe about $2,800 more than his current withholding covers.
With several months of the year still ahead, he increases his W-4 withholding at his main job for the remainder of the year, closing most of the gap before it becomes a single large balance due the following spring, instead of discovering the shortfall for the first time at filing season.
Owing any amount when I file means I did something wrong.
Owing a reasonable, expected balance is a normal outcome, especially for anyone with variable or additional income during the year. The safe harbor rules exist specifically to distinguish a normal balance from an underpayment penalty situation.
If I can't pay my full tax bill by the deadline, I shouldn't file at all.
Filing on time (or filing an extension) and paying what you can is significantly better than not filing, the failure-to-file penalty is generally steeper than the failure-to-pay penalty, and payment plans are available for balances you can't pay in full immediately.
Generally, if you owe less than $1,000 after subtracting withholding and payments, or if you meet the safe harbor percentages described above, you typically won't face an underpayment penalty, confirm the specific current-year thresholds, since they're the deciding factor.
The failure-to-file penalty applies when you don't file a return or extension by the deadline and is generally more costly per month than the failure-to-pay penalty, which applies when you file on time but don't pay the full balance owed.
Yes, the IRS offers short-term and long-term payment plan options for eligible taxpayers, generally applied for directly through IRS.gov, which can meaningfully reduce the stress of an unexpected balance.
If your income situation has changed at all this year, run a mid-year tax check using the IRS Tax Withholding Estimator to catch a potential shortfall while there's still time to adjust.
With unexpected bills covered, the next lesson, TXS115: Taxes for Freelancers and Gig Workers, dives deeper into a group of filers especially prone to this exact situation.
That's where Financial Confidence becomes your personal mid-year tax check.
Financial Confidence can help you estimate your year-to-date tax position, compare it against safe harbor thresholds, flag a likely shortfall early, and organize a plan to close the gap before filing season.
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