Frequently asked questions
Effective 2026-04-28
A consolidated reference to every question that's come up about the calculator, the W-4 mechanics behind it, and Breakeven's privacy posture. If you came here with a specific question and it isn't answered below, it is probably covered at more depth in one of the guides.
Withholding, W-4, and tax basics
How much federal tax will I owe?
Your federal tax liability depends on your filing status, taxable income, and deductions. Breakeven projects it from your paychecks and W-4 using the 2026 IRS tax brackets and standard deduction (Revenue Procedure 2025-32). Enter your paychecks on the calculator to see your projected annual liability, the tax already withheld year to date, and the gap between them.
How much should I withhold from my paycheck?
The right amount is whatever withholds exactly your projected annual tax liability — no more, no less. If Breakeven projects a gap, it recommends an additional amount per paycheck to enter in Step 4(c) of your W-4 to close it. That Step 4(c) amount is the simplest W-4 lever to adjust without refiling the full form from scratch.
Why did I owe taxes this year?
The most common cause is under-withholding: your employer's payroll system computed your withholding from a W-4 that did not reflect your full tax picture — for example, a second job, a working spouse, or a bonus that pushed you into a higher bracket. Breakeven shows exactly how much you were under-withheld and recommends a W-4 change that would have closed the gap.
Is Breakeven free?
Yes. Breakeven is a free in-browser calculator. There are no accounts, no subscriptions, and no data sent to a server. The site is supported by ads shown on the calculator page.
Is Breakeven tax advice?
No. Breakeven does arithmetic based on IRS Publication 15-T (2026) and Revenue Procedure 2025-32. It is a planning tool, not tax advice. Always verify material decisions with the IRS tax withholding estimator or a qualified tax professional before filing a W-4.
What is Step 4(c) on Form W-4?
Step 4(c) is the line on Form W-4 where you enter an extra dollar amount to withhold from each paycheck, on top of the withholding already calculated from your filing status and steps 1 through 3. It is the simplest lever for fine-tuning your withholding without refiling the rest of the form — useful when you have a second job, a working spouse, or a bonus that would otherwise under-withhold.
How often should I update my W-4?
Update your W-4 any time a major fact about your tax picture changes: a new job, a spouse starting or stopping work, a marriage or divorce, a new dependent, a significant raise, or a large bonus. Otherwise, a mid-year check during the spring is usually enough — it gives you time to adjust withholding for the remaining pay periods and avoid a surprise in April.
Does getting a refund mean I did something wrong?
A refund is not a mistake, but it is an interest-free loan to the federal government. If you are getting a large refund every year, you could instead keep that money in each paycheck by reducing your withholding — for example, increasing the dependents credit on Step 3 or removing extra withholding on Step 4(c). Breakeven shows the projected gap so you can choose how close to zero you want to land.
What is the difference between tax withheld and tax owed?
Tax withheld is what your employer deducts from your paycheck and sends to the IRS on your behalf throughout the year. Tax owed is your total federal income tax liability for the year, based on your taxable income, filing status, and deductions. When you file a return in April, the two are compared: withholding greater than liability means a refund, and withholding less than liability means a balance due.
Using Breakeven
Do I need to create an account to use Breakeven?
No. Breakeven has no sign-up, no login, and no account system. You open the page and start typing. Nothing you enter persists between sessions — closing the tab clears everything.
Does Breakeven save my entries between sessions?
No. Every paycheck, W-4 setting, and projected number lives in React component memory for the duration of the tab. Refresh the page or close the tab and the session is gone. This is by design — there is no database on any server or in your browser to breach, subpoena, or sell.
How accurate is Breakeven's projection?
For the scenarios it models (Single and Married Filing Jointly, federal income tax plus the 0.9% Additional Medicare Tax, standard deduction or a manual Step 4(b) lump sum, plus a rolling list of supported states), the arithmetic is exact against IRS Publication 15-T worked examples — verified by the engine's unit tests. Real tax outcomes can still differ when your situation includes things Breakeven doesn't model: regular FICA, credits with MAGI phaseouts, 1099 income without Step 4(a), unsupported states, and so on. The full list of exclusions is on the Methodology page.
Can Breakeven handle Head of Household filing status?
Not in Phase 1. The calculator supports Single and Married Filing Jointly. HOH is on the roadmap but not shipping yet — if you're an HOH filer, Breakeven's projection will be wrong for you. Use the IRS Tax Withholding Estimator instead.
What if I changed jobs mid-year?
Enter year-to-date paychecks from your current job and the filing status you expect at year end. If you expect to receive further paychecks from this job only for the rest of the year, the projection is sized correctly. If you left a previous job with earlier YTD earnings, add those paychecks too — Breakeven doesn't know about income that didn't come through the form. For the full multi-job picture, see the guide on multiple jobs and the W-4.
Why does Breakeven ask for my name and Social Security number?
Only when you generate a filled Form W-4 PDF — the blank IRS form has fields for your legal name and SSN that need to be stamped in. Those values live in React component memory for the seconds it takes to generate the PDF, and are discarded when the dialog closes. They are never logged, never written to storage, and never transmitted.
Can I use Breakeven on my phone?
Yes. Breakeven is a Progressive Web App — it installs to your home screen on iOS and Android, runs offline after the first load, and is responsive to mobile screen sizes. The calculator is optimized for paystub-in-one-hand, phone-in-the-other input.
Privacy and ads
Does Breakeven share my data with ad networks?
No. Breakeven itself has no data to share — everything you type stays in your browser tab. Advertisements on the calculator run in sandboxed third-party iframes that cannot read the numbers you enter. Browser iframe isolation prevents the ad script from accessing your calculator inputs. The ad networks run their own tracking based on general browsing behavior, which is outside Breakeven's control.
Does Breakeven use cookies?
Breakeven itself sets no cookies. Third-party ads may set their own cookies and run their own analytics — that is governed by each ad network's privacy policy, not Breakeven's. If you want to limit ad-network tracking, use an ad blocker or the privacy controls offered by those networks directly.
What happens if my internet disconnects mid-session?
Nothing breaks. Breakeven is a PWA, so once the initial page and service worker have loaded, the calculator runs entirely offline. All the math happens in your browser. You can add paychecks, adjust W-4 settings, and see projections without any network connection. Generating the filled W-4 PDF also works offline — the blank form template is cached by the service worker on first visit.