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Solo 401k Calculator

Financeby Shore District Software LLC
Open in ChatGPTWebsite
Launched Apr 17, 2026 on ChatGPT

Find out your maximum Solo 401(k) contribution in seconds. Enter your income, age, and business type to see employee and employer contribution limits, plus after-tax room for Mega Backdoor Roth. Supports sole proprietorships, LLCs, and S-corps. Updated for 2025 and 2026 limits.

  • For educational purposes only. Not financial or tax advice. Consult a professional before making financial decisions.
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Shore District Software LLCDeveloper
FinanceCategory

Available Tools

Solo 401(k) Calculator

solo-401k-calculator
Full Description

Calculate maximum Solo 401(k) contributions. GUIDANCE: If the user provides AT LEAST ONE input value call the tool with the provided value, and assume the tool will use sensible defaults for the remaining inputs. If they do not provide ANY inputs, ask them for the input values. Unless warranted, just return the tool result without any extra analysis.

Parameters (0 required, 4 optional)
Optional
agenumber

Age as of Dec 31st (50+ for catch-up). Defaults to 35.

Default: 35
entityTypestring

Entity type. Defaults to sole-prop.

Options:sole-props-corp
Default: sole-prop
netIncomenumber

Net self-employment income. Defaults to $100,000.

Default: 100000
taxYearnumber/string

Tax year (2025 or 2026). Defaults to 2025.

Options:2025202620252026
Default: 2025

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