S-Corp & Solo 401(k) Tax Command Center: S-Corp Calculator & Reasonable Salary (2026)

S-corp tax calculator, reasonable salary builder and Solo 401(k) planner for U.S. freelancers, consultants and 1099 business owners. See if an S-corp actually saves YOU money in 2026, set a salary you can defend, and max out your Solo 401(k), all with your own numbers.

The S-Corp & Solo 401(k) Tax Command Center

Does the full 2026 federal math for you, side by side, and walks you through doing it right with the S.T.A.C.K. Method:

S - See your tipping point

T - Take a reasonable salary

A - Automate payroll & your accountable plan

C - Contribute to your Solo 401(k)

K - Keep it compliant

WHAT'S INCLUDED (6 files)

• Tax Command Center Workbook (Excel + Google Sheets, 13 tabs): dashboard, S-corp vs sole-prop verdict, tipping-point table, salary sweet spot, reasonable salary builder, Solo 401(k) maximizer, accountable plan calculator, mileage log, payroll plan, compliance calendar and 2026 tax figures. Real formulas, nothing to set up.

• Interactive Planner (web page): the same math in any browser, on a computer, tablet or phone. Works offline.

• The Playbook (22-page PDF): plain-English guide with four example business owners, worked math, the reasonable-salary method, the QBI deduction, 12 costly mistakes and a Form 2553 election roadmap.

• Worksheets & Records Kit (fillable PDF, 11 worksheets): decision worksheet, reasonable compensation file, IRS factor documentation, Solo 401(k) worksheet, home office, monthly reimbursement report, mileage log and annual checklists.

• Corporate Record Templates (Word, 8 templates): accountable plan policy, written consents, annual consent setting your salary, salary memo, Solo 401(k) resolution, health insurance resolution, reimbursement request and distribution record.

• Quick-Start Guide (PDF): your answer in about 15 minutes.

AFTER THIS KIT, YOU'LL KNOW

• Your total taxes + costs as a sole proprietor vs. an S-corp, and your net savings

• The profit level where an S-corp starts paying off for you (your tipping point)

• A reasonable salary built with the many-hats method and IRS factors

• Exactly how much you can put in a Solo 401(k) both ways, and the salary needed to max it

• How much you can reimburse yourself tax-free each month for home office, phone and miles

• Every payroll, tax and retirement deadline for the year

WHO IT'S FOR

• Freelancers, consultants and 1099 contractors with about $60,000+ of net profit

• Single-member LLC owners wondering "should I be an S-corp?"

• Current S-corp owners who want to set salary and reimbursements correctly

• Married couples running one business

UPDATED FOR 2026

$184,500 Social Security wage base · $24,500 401(k) deferral (+$8,000 at 50+, $11,250 at 60–63) · $72,000 total 401(k) limit · 72.5¢ mileage · 2026 brackets & QBI thresholds · new Roth catch-up rule

WORKS WITH

Microsoft Excel, Google Sheets (free), any web browser and any PDF reader. Templates open in Word, Google Docs or Pages. No subscription, no sign-up.

HOW IT WORKS

1. Download your 6 files.

2. Enter your profit, age and health insurance in the yellow cells (an example is already filled in).

3. Read your verdict, then follow the S.T.A.C.K. steps in the Playbook and take your worksheets to your CPA.

PLEASE NOTE

• This is a digital download. Nothing will be shipped.

• For education only. Not tax, legal or financial advice. Stackwise is not a CPA or law firm. Review your election, salary and retirement plan with a qualified professional.

• Federal estimates for tax year 2026; state income tax is not modeled.

• License: use for your own business and for clients you advise. Please don't share or resell the files.

• Because this is a digital download, all sales are final.