Tax math you can defend to a CPA.
Tax tools either oversimplify into uselessness or hide the math behind a paywall. CalcBold's Tax & Deductions calculators do neither — every formula is the IRS one (federal brackets, FICA, SE tax, AMT) with the actual 2026 thresholds, and the result tells you not just the number but what to do about it. US is the launch focus; UK and India follow once we can publish equally defensible math for both.
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Top tax & deductions tools
- #1 Most-searched
Tax Bracket Calculator
Pick country + income. The calculator shows your marginal rate (the bracket your NEXT dollar lands in), your effective rate (the blended rate across all dollars), and what a $5k raise actually nets after federal income tax.
200K+/month
- #2
529 vs UTMA vs Roth (Kids) Calculator
Vehicle-by-vehicle growth + tax + FAFSA financial-aid impact. State 529 deduction lookup. SECURE 2.0 unused-529-to-Roth provision.
180K/month
- #3
Multi-State Remote Work Tax Exposure
Domicile state + every state you worked from — total tax owed, double-taxation exposure, NY/CT/DE/NE/PA convenience-rule penalty, recommended record-keeping.
150K/month
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Tax Bracket Calculator — instant
The tax & deductions tool with the highest monthly demand. Run it here, then open the full version for AI insight, scenarios, and embed code.
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Every tax & deductions calculator
12 live
US — Federal
8 tools- 529 vs UTMA vs Roth New
529 vs UTMA vs Roth (Kids) Calculator
Vehicle-by-vehicle growth + tax + FAFSA financial-aid impact. State 529 deduction lookup. SECURE 2.0 unused-529-to-Roth provision.
180K/month - Multi-State Remote New
Multi-State Remote Work Tax Exposure
Domicile state + every state you worked from — total tax owed, double-taxation exposure, NY/CT/DE/NE/PA convenience-rule penalty, recommended record-keeping.
150K/month - HSA Triple-Tax New
HSA Triple-Tax Optimizer
Project HSA growth at retirement vs Trad 401(k), Roth 401(k), and taxable. Optimal shoebox-method receipt-storage timeline.
120K/month - Bonus Tax New
Bonus Tax Calculator
Enter your salary + bonus + state. The calculator shows the supplemental flat withholding (22% federal) versus your real marginal tax — and tells you whether you'll get money back at filing or owe more.
100K+/month - Mega-Backdoor Roth New
Mega-Backdoor Roth Calculator
Check eligibility (after-tax + in-plan/in-service), compute this year's after-tax headroom, and project lifetime Roth growth vs taxable.
85K/month - Backdoor Pro-Rata New
Backdoor Roth + Pro-Rata Trap Calculator
Compute pro-rata tax bill if Trad IRA pre-tax balances trigger aggregation. Mitigation: roll pre-tax to 401(k) first.
70K/month - Quarterly Tax New
Quarterly Estimated Tax Calculator
Plug in your projected income, withholding, and last year's numbers. The calculator applies the IRS safe harbor and tells you exactly what to send by April 15 — and the same amount each following quarter.
60K+/month - DCFSA vs CTC New
Dependent Care FSA vs Child Tax Credit Calculator
Optimal DCFSA contribution + residual claimed via CDCC (Form 2441). Total tax saved this year vs CDCC alone.
55K/month
Equity Compensation
2 tools- RSU Tax New
RSU Tax & Withholding Shortfall Calculator
Enter your salary + RSU vest + YTD prior vests. The calculator shows the 22% supplemental flat withholding vs your real marginal tax — and the cumulative shortfall across the year that triggers FAANG-tier April balances.
40K+/month - ISO / NSO New
Stock Options ISO/NSO + AMT Calculator
Toggle between ISO and NSO. The calculator runs the IRS 2026 federal brackets + Form 6251 AMT math + FICA — and tells you exactly how much tax you owe at exercise, plus the cash you actually need on hand.
25K+/month
UK · India · Multi-country
2 tools- Tax Brackets New
Tax Bracket Calculator
Pick country + income. The calculator shows your marginal rate (the bracket your NEXT dollar lands in), your effective rate (the blended rate across all dollars), and what a $5k raise actually nets after federal income tax.
200K+/month - Nomad Tax New
Digital Nomad Tax Residency Optimizer
Compare US-stay vs FEIE (Form 2555) vs FTC route across 12+ nomad destinations. Bona Fide vs Physical Presence eligibility, state shedding, treaty offsets, self-employment tax — surfaces best route + savings vs baseline.
80K/month
Sources we cite
Where the tax & deductions numbers come from
IRS 2026 brackets (US) · HMRC PAYE 2025/26 (UK) · CBDT FY 2025-26 (India)
Frequently Asked Questions
The most common questions we get about this calculator — each answer is kept under 60 words so you can scan.
Are these calculators a substitute for a CPA?
No — they're a substitute for the back-of-envelope math you'd otherwise do yourself. The brackets, FICA constants, and SE tax math are the IRS ones, and the results are defensible to a tax professional. But they don't model AMT preference items beyond ISOs, multi-state allocations, foreign tax credits, or the dozens of niche credits the tax code includes. For anything high-stakes, run the calc here for a sanity check, then have a CPA confirm.Which tax year do you use?
US 2026 projected — based on IRS Rev. Proc. 2024-40 plus a ~2.5% inflation adjustment. The actual 2026 release lands in October 2025; until then, the projected values are within $50-100 of where the official numbers will land in most brackets. We refresh against the IRS release as soon as it's published. UK uses 2025/26 PAYE bands; India uses FY 2025-26 new-regime slabs.How accurate is the state tax?
We use a flat-rate approximation. Real state systems are progressive (CA, NY) or flat (PA, IL, NC) or zero (TX, FL, WA, NV, TN, SD, WY, NH on wages). For most workers a flat-rate approximation is within 1-2 percentage points of the actual state tax. For high earners in CA / NY, the real rate is higher than the flat approximation by 1-3 percentage points at the top.Do you store any of my tax inputs?
No. All math runs in your browser. The only outbound call is to our AI proxy to generate the insight paragraph, and that request is not logged or persisted. There are no accounts, no tax-prep history, no third-party trackers inside the tax calculators.