When business owners compare S Corporations and Partnerships, they usually focus on self-employment tax, payroll strategy, or compliance costs. What they almost never focus on — until it’s too late — is investor tax basis.
Basis determines:
- Whether losses are deductible
- Whether distributions are taxable
- Whether you recognize gain when selling your interest
And the rules are dramatically different between S Corporations and Partnerships.
What Is Investor Basis?
An investor’s basis generally:
- Starts with contributions
- Increases with income
- Decreases with losses and distributions
Simple in theory — until you see how differently it works across entity types.
S Corporation Basis: Narrow and Dangerous
An S Corporation shareholder’s basis is extremely limited.
What Increases S Corp Basis?
- Capital contributions
- Taxable income allocated to the shareholder
- Tax-exempt income
- Direct loans from the shareholder to the S Corp
What does not increase basis?
- Bank loans
- Mortgages
- Any third-party debt
This is where people get burned.
Example
Sarah invests $50,000 into an S Corp.
The company allocates her an $80,000 loss.
- She can only deduct $50,000 — the rest is suspended.
- Her stock basis drops to $0.
Next year the company distributes $20,000 cash.
Because Sarah has no basis, the entire $20,000 is taxed as a capital gain — even though economically she is still underwater.
Partnership Basis: Flexible and Powerful
Partnerships work very differently — and much more favorably.
What Increases Partnership Basis?
- Capital contributions
- Taxable income
- Tax-exempt income
- The partner’s share of partnership liabilities — for real estate partnerships this includes mortgages
This means partnership investors often have far more basis than cash invested.
Example
David invests $100,000 into a real estate LLC owning 50%.
The partnership buys a building for $1,000,000 using:
- $200,000 equity
- $800,000 mortgage
David’s basis becomes:
- $100,000 cash
- $400,000 share of mortgage
- = $500,000 total basis
Year 1: David is allocated $120,000 loss
→ Fully deductible.
Year 2: Another $20,000 loss and a $50,000 cash distribution
→ The loss is deductible and the distribution is tax-free because he still has basis.
Why This Matters So Much
S Corporations routinely create these traps:
- Losses get suspended when investors need them most
- Distributions become taxable even though no profit was made
- Highly leveraged businesses get punished
Partnerships, on the other hand:
- Allow loss deductions funded by debt
- Permit tax-free distributions funded by refinancing
- Align tax results with economic reality
The Bottom Line
The wrong entity structure doesn’t just cost you money — it changes the timing and character of your income.
By the time most business owners discover basis limitations, the damage is already done.
Choosing between an S Corp and a Partnership is not a formality — it is a long-term tax strategy decision that should be made with full awareness of how investor basis truly works.
Disclaimer:
This article is for educational purposes only and does not constitute tax or legal advice. Please consult your tax advisor before restructuring or making investment decisions.