The IRS issued more than 102 million tax refunds for the 2023 filing season, averaging $3,167 per return. Recipients generally treated the refund as a windfall — a bonus from the government, evidence that they had managed their taxes well. It is none of those things. A refund is the return of money you overpaid throughout the year, held interest-free by the Treasury for up to 15 months. A $3,167 refund represents roughly $263 per month of excess withholding that could have been in your paycheck, paying down debt or earning investment returns. Treating a refund as a victory is treating an interest-free loan to the IRS as a savings strategy.
What a refund actually is
A tax refund is the difference between the total tax you paid during the year (through employer withholding and estimated payments) and the total tax you actually owed. Withholding is set on Form W-4, which your employer uses to calculate how much federal income tax to deduct from each paycheck. Set withholding too high, and you overpay all year, receiving the surplus as a refund the following spring. Set it correctly, and you owe or are owed a negligible amount at filing. The IRS does not pay interest on refunds for the period they hold your money — meaning every dollar of over-withholding is a dollar loaned to the Treasury at 0%.
The mechanics are simple but the psychology is fascinating. Workers describe refunds as "forced savings" — a way to set money aside without the discipline of monthly saving. The same workers would never describe loaning $3,000 to a bank at 0% interest for a year as a savings strategy, but that is exactly what they are doing. The difference is that the IRS makes the loan feel like a windfall by returning the money in a lump sum, which feels different from receiving $263 extra in each month's paycheck. The math is identical; the framing is opposite.
The opportunity cost of over-withholding
Every dollar over-withheld is a dollar not earning a return elsewhere. A $3,167 refund parked at 0% with the IRS for an average of 8 months represents roughly $89 in foregone interest at a 4% high-yield savings rate, or $221 in foregone returns at a 10% equity return. That is the floor of the cost; the ceiling is much higher if the over-withholding prevents you from paying down high-interest debt.
Consider a worker carrying $5,000 in credit card debt at 22% APR. A $3,000 annual refund means she overpaid the IRS by $250 monthly while paying roughly $92 monthly in credit card interest. If she had instead directed that $250 to credit card repayment each month, she would have eliminated the balance in 22 months instead of 30, saving roughly $410 in interest. The "forced savings" of the refund cost her $410 in additional interest paid to the credit card issuer.
Adjusting your W-4 the right way
The W-4 form was redesigned in 2020 to eliminate withholding allowances and replace them with direct dollar adjustments. The form walks you through five steps: personal information, multiple jobs or working spouse, dependents, other adjustments, and signature. Most workers complete only step 1 and step 5, which guarantees they default to single-with-zero-dependents withholding — usually too high for anyone with dependents, a mortgage, or significant deductions.
The IRS provides a Tax Withholding Estimator at IRS.gov/W4app that uses your actual prior-year tax return to recommend specific dollar amounts to enter on the W-4. Run it in late January after you have your prior-year W-2s and 1099s, then submit a new W-4 to your employer. The estimator accounts for multiple jobs, dependents, itemized deductions, and other income. It produces a target refund or balance due and tells you exactly what to put on lines 3, 4, and 4(c) of the new W-4.
Re-run the estimator annually, and any time your situation changes — marriage, divorce, new child, job change, significant raise, new mortgage, large bonus. Withholding that was correct last year is almost certainly wrong this year if anything material changed. The IRS adjusts tax brackets, standard deductions, and credits annually for inflation, so even a stable situation drifts slightly.
The 2026 tax brackets and standard deduction
For 2026, the standard deduction is projected to be approximately $15,000 for single filers and $30,000 for married filing jointly, after the IRS's annual inflation adjustment. The seven federal brackets remain at 10%, 12%, 22%, 24%, 32%, 35%, and 37%, with bracket widths adjusted upward for inflation. A single filer earning $75,000 in 2026 will owe roughly $9,800 in federal income tax after the standard deduction — about 13% effective rate, even though their marginal rate is 22%.
The standard deduction matters for withholding because it is the largest single reduction in taxable income for the majority of filers. Workers who do not adjust their W-4 to reflect the standard deduction typically over-withhold by $1,500 to $3,500 annually. The W-4 step 3 accounts for dependents, but the standard deduction is built into the default tables — meaning single filers with no dependents usually have approximately correct withholding, while married filers with children almost always over-withhold unless they complete step 3.
The ideal refund target: $0 to $500
The optimal refund is small. The IRS recommends aiming for a refund of $0 to $500 or a balance due of $0 to $500. The slight bias toward a small refund (rather than a small balance due) reflects two realities: the underpayment penalty risk discussed below, and the practical observation that most workers prefer a small windfall to a small bill. But $500 should be the ceiling, not the floor. A $3,000 refund is six times the upper bound of the recommended range.
For self-employed workers and others who pay quarterly estimated taxes, the target is similar. Each quarterly payment should approximate one-quarter of the prior year's total tax liability (the safe-harbor rule), with adjustments for income changes. Quarterly payments due April 15, June 15, September 15, and January 15 should each be roughly one-quarter of the expected annual liability. Large over-payments followed by a refund are the same interest-free loan to the IRS, just paid in installments.
Underpayment penalties: the risk on the other side
Under-withholding has its own cost. The IRS charges an underpayment penalty — effectively interest at the federal short-term rate plus 3 percentage points — if you owe more than $1,000 at filing AND your withholding and estimated payments were less than 90% of the current year's tax or 100% of the prior year's tax (110% if AGI over $150,000). For 2026, the federal short-term rate is likely to be in the 4% to 5% range, making the underpayment penalty roughly 7% to 8% annually on the shortfall.
The penalty is calculated on Form 2210 and assessed automatically. The 90% / 100% / 110% safe harbors are the critical thresholds: if you cover at least 100% of last year's tax liability (110% if high-income), you avoid the penalty even if you under-withhold significantly relative to this year's liability. This is the safe harbor high-income earners with variable compensation (bonuses, equity, self-employment) use to avoid penalties while keeping money invested through the year.
The penalty is not catastrophic — 7% to 8% on a $3,000 underpayment for an average of 8 months is about $140 — but it is avoidable. The right withholding strategy stays just inside the safe harbor while keeping refunds small. For most W-2 workers, targeting a $200 to $500 refund achieves both goals.
Special situations that complicate withholding
Multiple jobs in a household require special W-4 attention. The default withholding tables assume each job is the only job, so two-earner households systematically under-withhold unless they complete W-4 step 2. The IRS provides a Multiple Jobs Worksheet, or you can simply check the box in step 2(c) which approximates the correct withholding for two jobs with similar pay. Skipping step 2 is the most common cause of surprise balance-due returns for married couples.
Side income — freelance work, investment income, rental income, equity compensation — also breaks the default withholding model. The W-4 has a step 4(a) line for "other income not from jobs" that lets you add expected non-wage income to the wage base for withholding calculations. If you have significant side income, you may also need to make quarterly estimated tax payments on Form 1040-ES to cover the tax on that income, since no employer is withholding from it.
What to do with the extra paycheck money
Adjusting your W-4 to reduce a $3,000 refund to $300 puts about $225 per month back in your paycheck. Without a plan, that money disappears into lifestyle inflation. Set up an automatic transfer for the exact amount of the withholding reduction, dated for the day after each payday, directed to wherever it does the most good: high-interest debt first, then an emergency fund to three months of expenses, then tax-advantaged retirement contributions, then taxable investing. The automation is essential — money not automatically redirected tends to be money not saved.
The behavioral objection to this approach is the loss of the "forced savings" mechanism. The objection is valid for workers who genuinely will not save the money if it lands in their checking account. But the solution is not to overpay the IRS — it is to set up an automatic transfer to a savings or investment account on payday. The forced-savings benefit is replicated, the interest is captured by you instead of donated to the Treasury, and the discipline of setting up the transfer is a one-time cost rather than an annual tax bill.
Running the numbers yourself
The IRS Withholding Estimator at IRS.gov/W4app takes about 15 minutes with your most recent pay stub and prior-year tax return. The output is a specific W-4 to submit to your employer. Re-run it annually and after major life changes. Our Tax Refund Estimator complements the IRS tool by letting you model different withholding scenarios and project your refund or balance due before filing season arrives. The right target is a small refund or small balance due — not the four-figure windfall that the marketing of "tax season" has trained Americans to celebrate.