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Calculators

Free tools built by the CPA who prepares the returns. Each one lists the rules and figures it uses.

All 12 calculators

Most used

S-Corp vs. Sole Proprietor ›1099 Estimated Tax Planner ›Withholding Checkup ›
When a tool isn’t enoughEvery calculator links to the service or model that covers the rest of the question.Send an inquiry

Models

Excel workbooks for reporting and tax analysis. Licensed per user or firm; you own your copy.

All models

What’s inside

21 tabs, 28,550 formulas (FRP) ›§1374 and LIFO recapture (C→S) ›Pre- and post-2025 §1202 rules ›
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Calculators›Business owners›True Runway
BUS-06Inputs: Revenue, expenses, entity type, scenariosEstimate only

True Runway

Cash Flow Forecast & Tax-Adjusted Reserve Planner — built for California small business owners. See what your cash really does once tax, trust liabilities, and forward operations are accounted for.

Scenario, View & Horizon

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%

Cash Position

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Revenue Streams

Stream$ / monthMonthly growth %

Operating Expenses

CategoryAmountType
Use % of revenue for variable costs (COGS, subs, merchant fees) so they flex with each scenario automatically.

Income Tax

$
$

Trust Liabilities & CA Franchise — not yours to spend

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$
$
%
%
Advanced rate overrides
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$
Federal brackets and standard deduction are 2026 (Rev. Proc. 2025-32); California uses the 2025 schedules, the latest the FTB has published. Estimated income tax modeled on the CA 30/40/0/30 weighting; sales tax remits Apr 30 / Jul 31 / Oct 31 / Jan 31.
True runway
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Lowest cash point
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Cliff date
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Distributable today
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without breaching buffer
Projected cash
Buffer floor (2-mo opex)
Tax-payment period
Move to reserve account today
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Where your cash actually stands

Monthly cash outflows — by category

Annual tax & trust obligations

Period-by-period forecast

Estimates only — not tax, legal, or financial advice and not a substitute for a filed return or engagement. Federal rate tables are 2026 (Rev. Proc. 2025-32); California tables are 2025, the latest published. QBI, NIIT, AMT, additional-Medicare, credits, basis limits, and entity-specific items may materially change actual liability. Estimated-tax and sales-tax timing are planning models, not payment schedules. Prepared with True Runway by James Stillion, CPA.

More for business owners

All 12
BUS-01S-Corp vs. Sole ProprietorEstimates self-employment tax savings from an S election, after a reasonable salary and the cost of running payroll.Business owners BUS-021099 Estimated Tax PlannerQuarterly federal and California estimates using the 90%, 100% or 110% safe harbor, with an option for uneven income.Business owners BUS-03Solo 401(k) and SEP-IRAMaximum contribution under each plan by entity type and age, and which plan allows more.Business owners BUS-04QBI Deduction Estimator (§199A)The 20% qualified business income deduction, with the income thresholds and the specified service trade or business rules.Business owners