TaxCalc
Tax planning on a real 1040 engine.
TaxCalc runs a line-by-line Form 1040 calculation, plus state income tax for all 50 states and DC, recomputed as you work. Model scenarios side by side, put real math behind every recommendation, and hand clients a quarterly payment plan computed from their actual numbers.
Line-by-line federal 1040, plus state tax for all 50 states and DC, for tax years through 2026.
Compute
A line-by-line 1040, computed as you type.
Enter wages, K-1s, Schedule C, E, and F activity, investments, and deductions on simple cards. TaxCalc recalculates the whole return as you work — tax, credits, and penalties, line by line, for the right tax year.
- Line-by-line federal 1040 for tax years through 2026, plus state tax for all 50 states and DC — multi-state and part-year residency included
- AMT, QBI, net investment income tax, self-employment tax, capital gains and loss carryovers, child tax credit, taxable Social Security
- Marginal bracket, effective rate, and refund-or-due, updated on every change
Plan
Model the what-ifs with real math.
Run multiple estimates side by side and compare them line by line. Test an S-corp election, a Roth conversion, retirement contributions, or charitable timing — and show the client exactly what each move changes.
- Side-by-side scenario comparison, down to individual 1040 lines
- Strategy analysis: entity election, retirement plans, Roth conversions, QBI, charitable timing
- K-1s sync from linked business binders, with ownership percentages applied automatically
Deliver
Quarterly payments your clients actually make.
TaxCalc computes recommended federal and state estimated payments with safe-harbor logic, tracks what's been paid, and flags catch-ups — then hands you reports the client can act on.
- Safe-harbor quarterly estimates for federal and state, with catch-up recommendations
- Underpayment penalty math built in (Form 2210)
- Excel reports for the tax plan, payments analysis, and state returns — ready to send
Why a real engine
Planning numbers a CPA can stand behind.
Most tax planning happens in a spreadsheet with last year's brackets, or in a black-box estimator that won't show its work. Either way, the advice carries your signature — and a projection that's off by one phase-out or one safe-harbor rule costs real money and real trust.
TaxCalc is an actual calculation engine: the same line numbers as the form, with year-aware rates and thresholds, and every computed total traceable to the inputs behind it. When you tell a client what a Roth conversion or an entity change does to their year, the number comes from the form math — not a rule of thumb. That same traceability is the foundation for where Tallyfor is headed: automation that drafts the busywork and shows its work, because you're the one signing the advice.
FAQ
TaxCalc questions.
What is TaxCalc?
Tallyfor's tax planning module. It runs a line-by-line Form 1040 calculation engine, with state income tax for all 50 states and DC, and recomputes as you work — so planning advice comes from real form math instead of a spreadsheet approximation.
Does TaxCalc file the tax return?
No. TaxCalc is for planning and projections during the year — modeling scenarios and setting estimated payments. The return itself is prepared and filed in your tax software: CCH Axcess, Drake, Lacerte, ProConnect, or UltraTax.
Which calculations does the 1040 engine run?
Ordinary and capital-gains rates, AMT, the QBI deduction, net investment income tax, self-employment tax, the child tax credit and dependent care credit, taxable Social Security, and Form 2210 underpayment penalties — plus state income tax for all 50 states and DC, including multi-state and part-year residency — for recent tax years through 2026.
Where does the client's data come from?
Schedule cards you fill in directly, documents you upload — prior-year 1040s, W-2s, and IRS transcripts are extracted automatically — and K-1s synced from a linked business binder, with ownership percentages applied.
Stop planning the year in a spreadsheet.
Run one client through TaxCalc and put real 1040 math behind your advice.