How tax.ing calculates your result

The calculator is deterministic: the same inputs and tax year produce the same numbers. Language models help classify ambiguous statement descriptions and challenge possible deductions; they do not set tax rates or calculate the return.

Tax calculation

Employment income is passed through the federal and state, provincial or territorial brackets for the selected year. The result includes payroll contributions, surtaxes and levies that sit outside the headline brackets. Each line is calculated separately before the totals, effective rate and marginal rate are derived.

Public salary pages assume one employee, the single or individual filing status, the standard deduction, and no dependants or additional credits. They are comparisons, not personalised returns. The statement analysis asks for the extra facts it needs and recomputes the return with and without each position.

Verification and uncertainty

Tables are versioned by tax year. Where a primary schedule is available, state figures are checked against the state revenue department or enacted law, and Canadian figures against CRA and provincial sources. Secondary sources, carried schedules and local-tax estimates are disclosed on the result instead of hidden.

Every deduction finding includes its legal basis, evidence requirements and a confidence and risk assessment. A second, adversarial review can lower confidence or raise risk, but cannot make a position look safer. The site never files a return and is not a substitute for a qualified preparer.

Where-your-tax-goes figures

Published spending is converted into programme shares, then those shares are applied to the tax calculated for the visitor. This is an allocation, not a trace of specific tax dollars. Governments borrow and collect other revenue, so the figures describe the composition of spending rather than a balanced ledger.

Primary sources

US federal tax — IRS inflation adjustments, Internal Revenue Code provisions and enacted legislation.
US state tax — Each state revenue department's published schedule or enacting legislation.
Canadian tax — CRA federal, provincial and territorial brackets, payroll tables and Income Tax Act provisions.
US spending — US Treasury Monthly Treasury Statement and Census state government finance data.
Canadian spending — Federal Main Estimates and Statistics Canada provincial and territorial finance tables.
Exchange rates — Bank of Canada daily rates for Canadian filings and ECB reference rates for other pairs.

Each rate page also names the fiscal year, data source and any caveat that applies to that jurisdiction. Source links lead to the publisher, not a copied table.