A full return, worked through step by step.

Not a bracket lookup — a 1040 engine. Filing status, dependents, deductions, credits, capital gains, self-employment, state on top. It walks the same order the form does.

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The whole return

Income, adjustments, the standard-vs-itemized decision, credits including EITC and the child tax credit, AMT when it applies — computed in sequence, the way the IRS does it.

Checked 176 ways

The engine runs against 176 automated test returns covering the edge cases that break simpler calculators. When tax law shifts, the tests catch what changed.

An estimate that explains itself

Every line of the result traces back to an input you gave it. No black box between your numbers and the answer.

An estimate for planning, clearly labelled as one. FinnaCalc never files for you and this is not tax advice.