Free embeds for finance publishers

Put a transparent tax answer inside your article.

Each iframe is hosted by TaxMathKit, runs calculations in the reader's browser, and links back to the full formula, assumptions, and primary sources. No API key or account is required.

Open the publisher kit ↗Download reference assets

Paste-ready iframe sources

Choose the calculation your readers need

Keep the title attribute and attribution link when you publish. Rates, assumptions, and source notes remain visible on the hosted calculator.

income tax calculator

Federal Income Tax Calculator

Estimate federal ordinary income tax with filing status, standard deduction, and visible brackets.

<iframe src="https://taxmathkit.com/embed/income-tax-calculator" title="Federal Income Tax Calculator" width="100%" height="820" loading="lazy" style="border:0"></iframe>

Preview embed ↗Open direct URL

1099 tax calculator

1099 Tax Calculator

Separate business profit, self-employment tax, federal income tax, withholding, and quarterly reserve.

<iframe src="https://taxmathkit.com/embed/1099-tax-calculator" title="1099 Tax Calculator" width="100%" height="900" loading="lazy" style="border:0"></iframe>

Preview embed ↗Open direct URL

self employment tax calculator

Self-Employment Tax Calculator

Apply the 92.35% base, Social Security wage-base room, Medicare, and the deductible half.

<iframe src="https://taxmathkit.com/embed/self-employment-tax-calculator" title="Self-Employment Tax Calculator" width="100%" height="820" loading="lazy" style="border:0"></iframe>

Preview embed ↗Open direct URL

sales tax calculator

Sales Tax Calculator

Choose a state, use its included 2026 average combined planning rate, and see tax and total separately.

<iframe src="https://taxmathkit.com/embed/sales-tax-calculator" title="Sales Tax Calculator" width="100%" height="820" loading="lazy" style="border:0"></iframe>

Preview embed ↗Open direct URL

vat calculator

VAT Calculator

Add VAT to a net amount or remove included VAT from a gross amount with country presets and custom rates.

<iframe src="https://taxmathkit.com/embed/vat-calculator" title="VAT Calculator" width="100%" height="820" loading="lazy" style="border:0"></iframe>

Preview embed ↗Open direct URL

lottery tax calculator

Lottery Tax Calculator

Compare federal withholding with estimated final federal tax, optional state tax, and after-tax winnings.

<iframe src="https://taxmathkit.com/embed/lottery-tax-calculator" title="Lottery Tax Calculator" width="100%" height="860" loading="lazy" style="border:0"></iframe>

Preview embed ↗Open direct URL

california tax calculator

California State Income Tax Calculator

Estimate 2025 California taxable income, state tax, deduction used, and effective rate.

<iframe src="https://taxmathkit.com/embed/california-tax-calculator" title="California State Income Tax Calculator" width="100%" height="820" loading="lazy" style="border:0"></iframe>

Preview embed ↗Open direct URL

Attribution that keeps tax estimates honest

Use wording such as: “Calculation powered by TaxMathKit; see the formula and source method.” The result is an educational planning estimate, not tax, legal, or financial advice.