Model your projected federal tax liability, check your quarterly estimated payments against the IRS safe-harbor rules, and see whether an S-corp election could lower your tax bill, all in real time.
Enter projected full-year figures. Results update as you type.
2026 federal tax, Texas has no state income tax.
The IRS lets you avoid underpayment penalties by paying in the lesser of 90% of this year's tax or 100%/110% of last year's tax.
Dates: Apr 15, Jun 16, Sep 15, and Jan 15 of the following year.
If withholding alone already covers the safe-harbor target, no quarterly vouchers are required. Underpayment penalty is calculated by the IRS at the federal short-term rate + 3%, applied per quarter shortfall.
Compare paying full self-employment tax on all profit vs. electing S-corp status: a reasonable salary through payroll, with the remainder as a distribution not subject to SE tax.
This ignores S-corp payroll administration costs (payroll service, separate tax filings, reasonable-comp documentation), typically $800 to $2,500 per year, which should be netted against any savings shown below.
| Structure | Sole Prop / LLC | S-Corp Election |
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Save projections from the Individual tab to compare strategies side by side, for example baseline vs. maxing out a 401(k), or before and after a Roth conversion. Saved in this browser only.