Income Tax Calculator

How it works

Selecting the correct US tax worksheet

Start with the tax year and the specific income, deduction, or credit question you need to model. The calculator contains separate supported branches, so a result from one worksheet should not be assumed to represent an entire return. Review eligibility and limitation notes beside the selected mode. Changing the website language or currency does not convert these US federal rules into another country's tax system.

2026 federal wage estimate: formula and assumptions

Apply progressive 2026 federal brackets to taxable ordinary income after the chosen deduction. Calculate employee payroll taxes separately.

This wage-only estimate is not a complete tax return or W-4 withholding engine. State/local tax is an explicit amount you supply.

2025/2026 ordinary-income worksheet: formula and assumptions

Taxable income = max(0, ordinary income − adjustments − deduction); apply year-specific brackets.

Basic standard deductions reflect the amended 2025 and published 2026 amounts. Age/blindness, dependent status, itemization limits and special deductions require verified input. This is a bounded US federal scenario; it does not produce a completed tax return.

2026 base self-employment tax: formula and assumptions

Net earnings = 92.35% × profit; base SE tax = 12.4% subject to remaining Social Security wage base + 2.9% Medicare.

Regular nonfarm method and nonnegative combined profit. Earnings below $400 receive no base SE tax in this branch. Additional Medicare is separate. This is a bounded US federal scenario; it does not produce a completed tax return.

Additional Medicare coordination: formula and assumptions

Additional Medicare tax = 0.9% of eligible wages/SE earnings above the filing-status threshold, coordinated once.

Enter net SE earnings after the Schedule SE adjustment. The final liability threshold can differ from the employer withholding trigger. This is a bounded US federal scenario; it does not produce a completed tax return.

2026 qualified dividends & gains: formula and assumptions

Stack qualified gains above ordinary taxable income through the 0%, 15% and 20% bands.

This is the simple preferential-rate branch, excluding special-rate gains, loss netting and other worksheet exceptions. Ordinary taxable income is supplied after deductions. This is a bounded US federal scenario; it does not produce a completed tax return.

Net investment income tax: formula and assumptions

NIIT = 3.8% × min(eligible investment income, MAGI above the status threshold).

Income classification, material participation and allocable expenses must be established separately. Wages are not automatically investment income. This is a bounded US federal scenario; it does not produce a completed tax return.

2026 dependent-credit basic branch: formula and assumptions

Preliminary credit = $2,200 per qualified child + $500 per eligible other dependent − phaseout.

Basic ACTC uses the eligible remaining credit, $1,700 per-child cap and 15% of earnings above $2,500. This mode excludes three-child, Puerto Rico and other special Schedule 8812 branches. This is a bounded US federal scenario; it does not produce a completed tax return.

2026 basic additional child tax credit: formula and assumptions

Basic ACTC = min(eligible remaining child credit, $1,700 × children, 15% × max(0, earned income − $2,500)).

Enter a separately determined preliminary credit and applicable tax limit. Other-dependent credit is not refundable; this excludes the special Schedule 8812 branches. This is a bounded US federal scenario; it does not produce a completed tax return.

2026 AMT from computed ordinary AMTI: formula and assumptions

Additional AMT = max(0, tentative minimum tax after exemption − adjusted regular tax).

Uses the 2026 50% exemption phaseout and 26%/28% brackets. This mode excludes preferential gains, AMT foreign credits and MFS special AMTI adjustments; those need the full Form 6251. This is a bounded US federal scenario; it does not produce a completed tax return.

2025 / 2026 federal income and additional taxes: formula and assumptions

Return tax = income tax after credits + regular SE tax + Additional Medicare + NIIT + other verified taxes.

A planning estimate for the selected 2025 or 2026 tax year combining supported federal income, deductions and credits. QBI uses a verified deduction or one-business worksheet. EITC uses a verified credit or a continuous estimate. The additional child-credit calculation includes the three-or-more-child payroll alternative. AMT, special-return amounts and eligibility require the stated verified inputs. State/local calculations use separate entered assumptions.

2025 / 2026 standard deduction eligibility branches: formula and assumptions

Dependent basic deduction = min(status basic amount, max($1,350, earned income + $450)); add eligible age/blind amounts.

Eligibility is supplied. Verify the age-65 test for the selected tax year, along with blindness, dependency and special filing conditions. Select the applicable tax year. Dollar ceilings and tax bands use that year’s versioned parameters; 2025 does not include the 2026 nonitemizer charitable deduction, charitable floor, overall itemized reduction or active-business QBI minimum.

Taxable Social Security benefits: formula and assumptions

Apply the 50% and 85% inclusion bands to provisional income; taxable benefits never exceed 85% of benefits.

Current-year benefits only. Repayments, prior-year lump-sum elections and deduction feedback rules require separate worksheets. Select the applicable tax year. Dollar ceilings and tax bands use that year’s versioned parameters; 2025 does not include the 2026 nonitemizer charitable deduction, charitable floor, overall itemized reduction or active-business QBI minimum.

2025 / 2026 enhanced senior deduction: formula and assumptions

Per eligible senior: max(0, $6,000 − 6% × MAGI above the applicable threshold).

Married taxpayers must file jointly. Valid identification and age eligibility must be established. This deduction does not reduce AGI or provisional income for Social Security taxation. Select the applicable tax year. Dollar ceilings and tax bands use that year’s versioned parameters; 2025 does not include the 2026 nonitemizer charitable deduction, charitable floor, overall itemized reduction or active-business QBI minimum.

2025 / 2026 common itemized deductions: formula and assumptions

Apply selected-year medical, SALT and charitable limits. The 0.5%-of-AGI cash-charity floor and Section 68 reduction begin in 2026.

Common current-year cash donations up to 60% of AGI, with no other donation classes or carryovers. Other itemized amounts are supplied after their own eligibility limits. Select the applicable tax year. Dollar ceilings and tax bands use that year’s versioned parameters; 2025 does not include the 2026 nonitemizer charitable deduction, charitable floor, overall itemized reduction or active-business QBI minimum.

2025 / 2026 dependent-care credit amount: formula and assumptions

Eligible expense base × selected-year rate: 2025 uses a 35% to 20% schedule; 2026 begins at 50% with the two-stage phaseout.

Work, dependent, provider and expense eligibility must be verified. This is a nonrefundable credit; the standalone amount is not automatically usable in full. Excludes special MFS, deemed-earnings and prior-year expense rules. Select the applicable tax year. Dollar ceilings and tax bands use that year’s versioned parameters; 2025 does not include the 2026 nonitemizer charitable deduction, charitable floor, overall itemized reduction or active-business QBI minimum.

2025 / 2026 qualified tip deduction: formula and assumptions

Deduction = max(0, min($25,000, eligible tips) − $100 per completed $1,000 of MAGI above threshold).

Enter qualified voluntary cash or card tips after confirming the selected year’s occupation, reporting and identification rules. MFS is ineligible. Each business has its own net-income ceiling. Mandatory service charges do not qualify, and the deduction does not remove tips from wage or payroll-tax income.

2025 / 2026 qualified overtime deduction: formula and assumptions

Apply the $12,500 individual or $25,000 joint cap, then subtract $100 per completed $1,000 above the applicable MAGI threshold.

Enter only the FLSA-required premium above regular pay. Total pay for overtime hours, contractual bonuses and state-only premiums are not automatically eligible. For exactly 1.5× qualified overtime, the premium is one third of that total pay. MFS is ineligible. Select the applicable tax year. Dollar ceilings and tax bands use that year’s versioned parameters; 2025 does not include the 2026 nonitemizer charitable deduction, charitable floor, overall itemized reduction or active-business QBI minimum.

2025 / 2026 qualified personal vehicle interest: formula and assumptions

Cap eligible interest across all loans at $10,000, then subtract $200 per $1,000 or fraction above the MAGI threshold.

Verify a qualifying post-2024 first-lien purchase loan for a new personal-use vehicle with US final assembly and qualifying weight/use. Exclude interest deducted elsewhere. Refinances have qualified-debt limits. MFS uses the nonjoint threshold; vehicle and loan eligibility must be established separately. Select the applicable tax year. Dollar ceilings and tax bands use that year’s versioned parameters; 2025 does not include the 2026 nonitemizer charitable deduction, charitable floor, overall itemized reduction or active-business QBI minimum.

2025 / 2026 education credits by student: formula and assumptions

AOTC: 100% of first $2,000 plus 25% of next $2,000 per eligible student; LLC: 20% of up to $10,000 per return; then phaseouts and tax/refund limits.

Supports distinct AOTC and LLC students with one shared LLC expense cap. Confirm student, institution, reporting and identification requirements for the selected year. Refundability uses the claimant’s age and support facts. MFS is ineligible; no identifiers are collected.

2025 / 2026 student-loan interest deduction: formula and assumptions

Up to $2,500 per return, with joint MAGI phaseout $170,000–$200,000 for 2025 or $175,000–$205,000 for 2026; other eligible filers use $85,000–$100,000.

Verify a legally obligated qualified education loan and actual paid interest, excluding related-party/employer-plan loans and duplicate benefits. MFS and claimable dependents are ineligible. MAGI is measured before this deduction with the required addbacks. Select the applicable tax year. Dollar ceilings and tax bands use that year’s versioned parameters; 2025 does not include the 2026 nonitemizer charitable deduction, charitable floor, overall itemized reduction or active-business QBI minimum.

2025 / 2026 traditional IRA deduction ceiling: formula and assumptions

Deduction = min(contribution, compensation and shared annual capacity, income-dependent deduction ceiling).

The income phaseout reduces a ceiling rather than prorating your actual contribution. Compute spouses separately with verified compensation allocation. IRA and Social Security interactions may require the coordinated IRS worksheet. This does not calculate excess-contribution penalties. Select the applicable tax year. Dollar ceilings and tax bands use that year’s versioned parameters; 2025 does not include the 2026 nonitemizer charitable deduction, charitable floor, overall itemized reduction or active-business QBI minimum.

2025 / 2026 single-business QBI deduction: formula and assumptions

Apply the selected-year SSTB fraction, phased wage/property limit and taxable-income limit. The verified active-business minimum applies only in 2026.

One verified business. QBI excludes employee wages, nonbusiness interest, capital gains and deductible business tips, and is already reduced for allocable owner-level deductions. The 2026 $400 minimum requires at least $1,000 of active qualified QBI. Excludes multi-business loss allocation, aggregation, REIT/PTP and cooperative rules. Select the applicable tax year. Dollar ceilings and tax bands use that year’s versioned parameters; 2025 does not include the 2026 nonitemizer charitable deduction, charitable floor, overall itemized reduction or active-business QBI minimum.

2025 / 2026 QBI and overall itemized limitation: formula and assumptions

For 2026, calculate QBI before the Section 68 overall itemized reduction, then calculate that reduction using QBI. For 2025, no Section 68 overall reduction applies.

Uses a separately verified otherwise-allowed itemized amount and one qualified business. All deduction eligibility, individual itemized ceilings and qualified-business inputs must already be established. The QBI and itemized limitation are applied in statutory order. Select the applicable tax year. Dollar ceilings and tax bands use that year’s versioned parameters; 2025 does not include the 2026 nonitemizer charitable deduction, charitable floor, overall itemized reduction or active-business QBI minimum.

2025 / 2026 earned income credit planning estimate: formula and assumptions

Estimated credit = min(phase-in credit, phased-out maximum), subject to eligibility and the published income cutoff.

Continuous planning estimate using published parameters for the selected year. It can differ from the IRS income-bin table. Confirm residency, identification, dependency, qualifying-child, foreign-income and prior-disallowance rules separately. EITC children can differ from child-tax-credit children.

Worked example

Reference example currency: USD. These fixed examples do not change with your calculator preferences.

Using the 2026 federal wage estimate example:

Annual ordinary wage income ($)

85000

Filing status

Single

Federal income-tax adjustments ($)

0

Itemized deductions (0 = standard) ($)

0

Nonrefundable tax credits ($)

0

State/local tax (manual annual amount) ($)

0

Apply progressive 2026 federal brackets to taxable ordinary income after the chosen deduction. Calculate employee payroll taxes separately.

Example result

These are illustrative inputs. Change the values to explore a different scenario.

What to keep in mind

Select 2025 or 2026 in the combined federal calculation. It combines supported income, deductions, credits and additional federal taxes; specialist worksheets retain the tax year stated in their controls.

QBI supports a verified deduction or one-business calculation. EITC supports a verified amount or a continuous planning estimate that can differ from the IRS income-bin table. The child-credit calculation includes the three-or-more-child payroll alternative with its stated inputs.

Eligibility and worksheet-specific modified income must be confirmed. Enter AMT and unsupported special-return amounts separately, and exclude any amount already calculated here from other deductions or credits.

State/local comparisons use your own flat-rate assumptions and tax base. Federal bracket arithmetic can differ from tax-table rounding; these scenarios do not prepare or file a return.

Formula references

• IRS: 2026 federal tax parameters (opens in a new tab)
• SSA: 2026 wage base (opens in a new tab)
• IRS Revenue Procedure2024-40 (opens in a new tab)
• IRS Revenue Procedure2025-32 in IRB2025-45 (opens in a new tab)
• IRS Topic554 Self-employment tax (opens in a new tab)
• IRS ScheduleSE instructions2025 (opens in a new tab)
• IRS Topic 560: Additional Medicare Tax (opens in a new tab)
• IRS1040 instructions Qualified Dividends and Capital Gain Tax Worksheet (opens in a new tab)
• IRS Topic559 Net investment income tax (opens in a new tab)
• IRS Schedule8812 instructions (opens in a new tab)
• IRS Schedule8812(2025) (opens in a new tab)
• IRS Topic556 Alternative Minimum Tax (opens in a new tab)
• Public Law 119-21: tax changes and effective dates (opens in a new tab)
• IRS: Schedule 1-A additional deductions (opens in a new tab)
• IRS: 2025 tips and overtime transition guidance (opens in a new tab)
• IRS: final qualified-tips regulations (opens in a new tab)
• IRS: qualified overtime questions and answers (opens in a new tab)
• IRS: education tax benefits (opens in a new tab)
• IRS: education-credit instructions (opens in a new tab)
• IRS: contributions to traditional and Roth IRAs (opens in a new tab)
• IRS: 2025 retirement-plan and IRA limits (opens in a new tab)
• IRS: 2026 retirement-plan and IRA limits (opens in a new tab)
• IRS: taxation of Social Security benefits (opens in a new tab)
• IRS: qualified business income deduction instructions (opens in a new tab)
• IRS: earned income credit eligibility and worksheets (opens in a new tab)
• IRS: dependent-care credit instructions (opens in a new tab)
• SSA: annual contribution and benefit bases (opens in a new tab)
• IRS: alternative minimum tax instructions (opens in a new tab)

References explain the underlying methods; they do not imply endorsement or individual professional review of Finflo.

Common questions