Federal return estimate
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Use the status expected on Form 1040 for this federal return.
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Use annual federal taxable wages, not take-home pay.
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This can add self-employment tax and the related above-line deduction when the switch below is on.
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Uses 92.35% net earnings, OASDI wage-base limits, Medicare tax, and the additional Medicare threshold for the selected year/status.
Enter ordinary income only. Use known-tax mode for special capital gain or AMT cases.
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The deductible half of self-employment tax is calculated separately when self-employment tax is included.
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Enter the total itemized amount you have already verified.
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Federal ordinary brackets will be applied directly to this taxable income amount.
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Use this mode when the bracket calculator is not the right source of truth.
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Examples include nonrefundable portions of child, dependent care, education, or foreign tax credits you have verified.
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Enter only amounts you already expect to qualify for; eligibility is not inferred.
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Exclude Social Security, Medicare, state, local, and benefit deductions.
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Use 0 when estimating from final Forms W-2/1099.
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Include federal payments already made or firmly planned for this return year.
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This is added after nonrefundable credits and before payments.
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This is not part of current-year tax, but it affects cash due or refund received.
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Enter last year's federal total tax if checking underpayment exposure.
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This check is informational and does not replace Form 2210 or IRS penalty calculations.
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The filing check shows whether the current projection is above or below this cushion.
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Used in Filing Checks and JSON to show how close the result is to the target cushion.
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Choose cents for a filing worksheet or whole dollars for quick planning.
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Payment or credit Amount Refund effect Copy
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A federal tax refund is the cash difference between what a taxpayer has already paid for the year and the final federal tax obligation on the return. Withholding, estimated payments, and refundable credits sit on the payment side. Income tax after credits, self-employment tax, other federal taxes, and known prior balances sit on the obligation side. When payments are larger, the return points toward a refund. When obligations are larger, the return points toward a balance due.

Refund estimates are useful before filing because the answer is often driven by timing rather than by a new tax rule. An employee can have the same income tax but a smaller refund if less was withheld during the year. A freelancer can move from refund to balance due when self-employment tax or estimated payments are missing. A household with credits can see the result change depending on whether a credit is nonrefundable or refundable.

Refund estimates compare payment-side items with tax-side items.
Tax obligation
Income tax after nonrefundable credits, self-employment tax, other taxes, and known offsets
compared with
Payments and credits
Withholding, expected remaining withholding, estimated payments, and refundable credits

The estimate is a planning number, not a tax filing decision. Ordinary bracket math cannot decide whether a taxpayer qualifies for a credit, whether itemized deductions are allowed, whether capital gains receive special rates, or whether state and local tax rules apply. A good refund estimate makes the moving parts visible so the user can compare the result with a return worksheet, tax software, payroll withholding, or an official IRS tool.

How to Use This Tool:

Start with the tax year and filing status, then choose whether the page should estimate federal income tax from ordinary income or use a tax amount that has already been calculated elsewhere.

  1. Choose the federal return year and filing status. The year controls the ordinary bracket table, standard deduction, and Social Security wage base used in the estimate.
  2. Select Calculate federal tax from income when wages, ordinary income, deductions, credits, withholding, and payments are enough for a planning estimate. Select Use known tax before credits when tax software, a preparer, capital gain worksheets, AMT, or other special rules already produced the federal income tax amount.
  3. In income mode, enter annual W-2 wages, net self-employment profit, other ordinary income, above-line adjustments, and the deduction method. Use standard deduction for the built-in amount, itemized deductions for a verified Schedule A total, or manual taxable income when another worksheet already handled deductions.
  4. Turn on the self-employment tax estimate only when the net self-employment profit should be included in the federal estimate. The result adds Social Security, Medicare, and additional Medicare tax where applicable, and subtracts the deductible half of regular self-employment tax from adjusted gross income.
  5. Enter nonrefundable credits, refundable credits, federal withholding so far, expected remaining withholding, and estimated or extension payments. Nonrefundable credits reduce income tax only. Refundable credits are treated with payments after the tax is calculated.
  6. Use the advanced fields for other federal taxes, prior balance or refund offsets, a simple safe-harbor screen, a target refund cushion, and a payment-adjustment scenario. If an alert appears for a negative value, a safe-harbor percent outside 0% to 200%, or manual taxable income higher than AGI, fix that input before relying on the result.
  7. Read Refund Ledger first, then use Tax Breakdown, Payment Ledger, Refund Bridge, Filing Checks, Source Notes, and JSON to audit the path from income and payments to the projected refund or balance due.

Interpreting Results:

The headline result is positive when payments and refundable credits exceed current-year tax plus known offsets. It is a balance due when current-year tax and offsets exceed payments. A refund is not a bonus from the IRS; it usually means too much was prepaid or refundable credits exceeded the remaining tax. A balance due means the return still needs cash settlement after withholding, refundable credits, and direct payments are counted.

Current-year total tax is the tax-side subtotal before prior balances or refund offsets. It includes income tax after nonrefundable credits, optional self-employment tax, and any manual other-tax amount. Payments and refundable credits is the payment-side subtotal. It includes federal withholding so far, expected remaining withholding, estimated or extension payments, and refundable credits.

Filing Checks should be read as prompts, not final answers. The simple safe-harbor screen compares projected prepayments with a basic current-year or prior-year target and flags a shortfall. It does not calculate Form 2210 timing, annualized-income installment rules, farming or fishing exceptions, household employment rules, or high-income safe-harbor eligibility by itself.

The Refund Bridge is useful when a result looks surprising. Negative bars increase tax or offsets. Positive bars reduce tax or add payment-side value. Moving one field at a time makes it easier to see whether the result changed because income tax rose, self-employment tax was added, credits were limited, withholding changed, or a prior balance reduced the refund.

Technical Details:

Federal refund math is a reconciliation, not a standalone tax rate. The ordinary income tax calculation first reduces income to taxable ordinary income, applies the selected filing-status bracket schedule, caps nonrefundable credits at income tax before credits, and then adds other taxes. Payments and refundable credits are compared with that obligation after the tax side is built.

Progressive brackets tax only the slice of taxable income inside each band. For ordinary federal income tax, a taxpayer in the 24% marginal bracket does not pay 24% on all taxable income. The lower slices keep their lower rates, and the highest reached band sets the marginal rate shown in the tax breakdown.

Stage Formula or rule Main output affected
Gross ordinary income W-2 wages + net self-employment profit + other ordinary income Gross ordinary income
Adjusted gross income max(0, gross ordinary income - above-line adjustments - deductible half of regular SE tax) Adjusted gross income
Taxable ordinary income Standard deduction, verified itemized deductions, or manual taxable income. Non-manual taxable income is floored at zero. Taxable ordinary income
Income tax before credits Progressive ordinary bracket tax, unless known-tax mode supplies the amount directly. Federal income tax before credits
Nonrefundable credits credit used = min(income tax before credits, nonrefundable credits) Income tax after credits
Current-year total tax income tax after credits + self-employment tax + other taxes to add Current-year total tax
Refund or balance due withholding + estimated payments + refundable credits - current-year total tax - prior balance or offset Estimated refund or amount owed

For a progressive bracket schedule, let T be taxable ordinary income, Li the lower edge of bracket i, Ui the upper edge, and ri the rate for that bracket. The final bracket has no upper edge.

si = max ( 0 , min ( T , Ui ) - Li ) ordinary income tax = ∑ i=1 n ( si × ri )
Tax year Built-in standard deduction Bracket and wage-base source behavior
2025 federal return filed in 2026 Single and married filing separately: $15,750; married filing jointly: $31,500; head of household: $23,625. Ordinary bracket thresholds use the 2025 IRS rate schedules. Self-employment Social Security tax is limited by the 2025 OASDI wage base of $176,100.
2026 planning return filed in 2027 Single and married filing separately: $16,100; married filing jointly: $32,200; head of household: $24,150. Ordinary bracket thresholds use the 2026 IRS rate schedules. Self-employment Social Security tax is limited by the 2026 OASDI wage base of $184,500.

Self-employment tax uses net self-employment profit multiplied by 92.35% to approximate net earnings from self-employment. The Social Security portion applies 12.4% only up to the remaining OASDI wage base after W-2 wages. The regular Medicare portion applies 2.9% without a wage cap. Additional Medicare tax adds 0.9% when combined wages and self-employment earnings exceed the filing-status threshold.

Component Formula or threshold Planning note
Net earnings from self-employment net self-employment profit * 92.35% Used as the base for regular self-employment tax in this estimate.
Social Security part min(net earnings, wage base remaining after W-2 wages) * 12.4% The wage base is $176,100 for 2025 and $184,500 for 2026.
Medicare part net earnings * 2.9% Medicare has no wage-base ceiling in this estimate.
Additional Medicare part max(0, W-2 wages + net earnings - threshold) * 0.9% Thresholds are $250,000 for married filing jointly, $125,000 for married filing separately, and $200,000 for single or head of household.
Deductible half of regular SE tax (Social Security part + Medicare part) * 50% Reduces AGI in income mode. The additional Medicare part is not included in this deductible-half calculation.

The safe-harbor screen is deliberately simple. It sets a current-year target at 90% of current-year total tax and a prior-year target from the prior-year tax amount multiplied by the selected safe-harbor percent. When a prior-year target is available, the lower target is used. The check then compares withholding plus estimated payments with that target, and also treats a projected balance under the common $1,000 screen as likely covered. This is a useful warning flag, not a replacement for the official estimated-tax worksheet.

Area How it is handled Why it matters
Capital gains, qualified dividends, AMT, NIIT, and special taxes Not calculated by the ordinary bracket path. Use known-tax mode or manual other-tax fields when another worksheet supplies the amount. These items can materially change federal tax without changing ordinary taxable income.
Credit and deduction eligibility Amounts are accepted as entered. The page does not decide eligibility for EITC, child tax credit, education credits, SALT limits, mortgage limits, charity limits, or medical thresholds. An allowed credit or deduction and an entered credit or deduction are not the same thing.
State, local, foreign, estate, trust, business entity, and nonresident alien rules Outside scope. A federal individual estimate can be correct while the full filing outcome is still incomplete.
Penalty timing The safe-harbor screen does not allocate payments by quarter or apply annualized-income methods. Estimated-tax penalties depend on payment timing as well as annual totals.

Accuracy and Privacy Notes:

  • Treat the result as a source-reviewed planning estimate rather than a filing-ready recommendation.
  • The calculation itself runs in the browser and does not need names, Social Security numbers, addresses, bank details, or account credentials. Avoid entering taxpayer identifiers because they are unnecessary for the estimate.
  • Official tax forms, IRS worksheets, tax software, or a qualified adviser should be used before filing a return, changing withholding, making estimated payments, or advising another taxpayer.
  • Tax authorities can update forms, instructions, and guidance after rate tables are published. Check the result's source notes and the official sources before using the estimate for a time-sensitive decision.

Worked Examples:

A single filer estimating a 2025 return enters $60,000 of W-2 wages, uses the standard deduction, enters no credits or other taxes, and expects $6,500 of federal withholding. The standard deduction reduces income to $44,250 of taxable ordinary income. The bracket estimate is $5,071.50, so the payment side exceeds the tax side by $1,428.50. The ledger would show a projected federal refund of about $1,428.50 before any unmodeled items.

A taxpayer using known-tax mode enters $12,000 of federal income tax before credits from tax software, $1,500 of nonrefundable credits, $600 of refundable credits, $11,000 of withholding, $500 of estimated payments, and a $300 prior balance. Nonrefundable credits reduce the income tax to $10,500. Payments and refundable credits total $12,100, while tax plus the prior balance totals $10,800, so the cash result is a $1,300 projected refund.

A freelancer with W-2 wages and net self-employment profit should compare two runs when the result is close to zero: one with self-employment tax included and one with known-tax mode from a more complete worksheet. The first run explains the ordinary estimate and the self-employment tax bridge. The second run is better when capital gains, AMT, special credits, or other forms already changed the tax amount.

FAQ:

Does a projected refund mean my tax is low?

Not necessarily. A refund means payments and refundable credits exceed the tax obligation and known offsets. A high-tax year can still produce a refund if withholding or estimated payments were higher than the final obligation.

When should I use known-tax mode?

Use it when a more complete return worksheet already calculated federal income tax before credits. It is the safer path for capital gains, qualified dividends, AMT, NIIT, foreign tax issues, or other special rules that ordinary brackets do not model.

Are refundable and nonrefundable credits handled the same way?

No. Nonrefundable credits reduce income tax but cannot create a refund by themselves in this model. Refundable credits are counted with payments after the tax side is calculated.

Does the safe-harbor check prove there will be no penalty?

No. It is a simple annual screen using the entered prior-year tax and selected percent. Official penalty calculations can depend on quarterly timing, annualized income, special taxpayer categories, and Form 2210 details.

What should I verify before filing?

Verify filing status, deduction choice, credit eligibility, special tax treatments, state or local tax, and any penalty calculation against official forms, tax software, or a qualified adviser before using the estimate on a return.

Glossary:

Adjusted gross income (AGI)
Gross ordinary income after above-line adjustments and the modeled deductible half of regular self-employment tax.
Current-year total tax
Income tax after nonrefundable credits plus optional self-employment tax and any manual other-tax amount.
Nonrefundable credit
A credit that can reduce income tax to zero but does not add payment-side value after that point in this model.
Refundable credit
A credit counted with payments after tax is calculated, so it can increase a refund or reduce a balance due.
Safe harbor
A planning threshold used to screen whether withholding and estimated payments may be enough to avoid estimated-tax penalties. The page uses a simplified annual version.
Taxable ordinary income
The amount fed into ordinary federal bracket schedules after deductions, or the manual taxable income supplied by the user.

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