Schedule SE Detailed Calculator 2026 β Self-Employment Tax Multi-Business
Calculate SE tax across multiple Schedule C/F/K-1 businesses with W-2 coordination, optional method elections, church employee income, and the full 2026 SS wage base of $184,500.
$
Sum of all Schedule C, F, and K-1 SE income after deductions $
From W-2 Box 3 β reduces SS wage base available for SE $
Taxable if $108.28 or more (subject to SE but not SS cap same way) $0
Total SE Tax
$0
SS Portion (12.4%)
$0
Medicare (2.9%)
$0
Β½ SE Deduction
Schedule SE Detailed Computation
SE Tax Flow
How to Use This Schedule SE Calculator
Enter your combined net self-employment earnings from all Schedule C (sole proprietor), Schedule F (farm), and K-1 (partnership) income sources after deducting business expenses. Enter any W-2 wages that were subject to Social Security tax β this reduces the remaining SS wage base for your SE income.
The Formula
SE Earnings = Net SE Income Γ 92.35%
SS Tax = min(SE Earnings + W-2, $184,500) Γ 12.4% β (W-2 Γ 12.4%)
Medicare Tax = SE Earnings Γ 2.9%
Additional Medicare = max(0, SE Earnings β threshold) Γ 0.9%
Total SE Tax = SS Tax + Medicare Tax + Add. Medicare
Deductible Half = Total SE Tax Γ· 2
SS Tax = min(SE Earnings + W-2, $184,500) Γ 12.4% β (W-2 Γ 12.4%)
Medicare Tax = SE Earnings Γ 2.9%
Additional Medicare = max(0, SE Earnings β threshold) Γ 0.9%
Total SE Tax = SS Tax + Medicare Tax + Add. Medicare
Deductible Half = Total SE Tax Γ· 2
Example
Freelance designer: $85,000 net SE income, no W-2, single filer:
SE Earnings: $85,000 Γ 92.35% = $78,498
SS Tax: $78,498 Γ 12.4% = $9,734
Medicare: $78,498 Γ 2.9% = $2,277
Additional Medicare: $0 (below $200K)
Total SE Tax: $12,011 | Deductible half: $6,006
SE Earnings: $85,000 Γ 92.35% = $78,498
SS Tax: $78,498 Γ 12.4% = $9,734
Medicare: $78,498 Γ 2.9% = $2,277
Additional Medicare: $0 (below $200K)
Total SE Tax: $12,011 | Deductible half: $6,006
Extended
Multi-Business SE Ledger & Optional Method Comparison
Add multiple Schedules C/F/K-1, toggle optional method per farm, and compare with vs without optional methods side by side
Add each Schedule C, Schedule F (farm), or K-1 business below. Toggle the optional method for farm income when gross farm income exceeds actual net farm profit.
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Per-Business Breakdown
| Business | Gross Income | Net SE | Optional Method? | SE Earnings |
|---|
With vs Without Optional Method Comparison
| Scenario | Combined SE Earnings | SS Tax | Medicare | Total SE Tax | Β½ Deduction |
|---|
SS Wage Base Utilization ($184,500)
W-2 wages SE earnings applied Remaining base
Frequently Asked Questions
What is Schedule SE and who must file it?
Schedule SE (Self-Employment Tax) is filed with your Form 1040 if you have net self-employment income of $400 or more from any trade or business. This includes sole proprietors, partners, LLC members treated as sole proprietors, and those receiving church employee income over $108.28. SE tax covers Social Security and Medicare in lieu of FICA withholding.
What is the 92.35% reduction on Schedule SE?
You multiply net SE earnings by 92.35% (which is 100% minus 7.65%) before computing SE tax. This mirrors the employee FICA calculation β an employee pays 7.65% on gross wages, and the employer "matches" 7.65%. As a self-employed person you pay both halves, but you get to reduce your earnings first to approximate the employer match.
How does the W-2 Social Security wage base coordination work?
If you also received W-2 wages subject to Social Security tax, those wages count toward the $184,500 SS wage base. The SE calculator subtracts your W-2 SS wages from $184,500 to find the remaining base available for SE income. Only the SS portion (12.4%) is capped; Medicare (2.9%) applies to all earnings, and Additional Medicare (0.9%) applies above $200K for singles.
What is the optional method for Schedule SE and when is it beneficial?
The Farm Optional Method allows farmers with low income to report 2/3 of gross farm income (up to $6,960) to potentially earn Social Security credits even in low-profit years. The Non-Farm Optional Method lets non-farm self-employed use 2/3 of gross income if they had SE income in at least 5 of the prior 7 years. These are only useful when actual net income is very low but you want to maintain SS credits.
Can I deduct half of self-employment tax on my income tax return?
Yes. You can deduct 50% of the SE tax computed on Schedule SE as an adjustment to gross income on Schedule 1 of Form 1040. This deduction mirrors the employer's share of FICA, which is not included in an employee's gross income. The deduction reduces your adjusted gross income but does not affect the SE tax calculation itself.